update deps

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

Gopkg.lock

@@ -4,7 +4,10 @@
 [[projects]]
   branch = "master"
   name = "github.com/Azure/go-ansiterm"
-  packages = [".","winterm"]
+  packages = [
+    ".",
+    "winterm"
+  ]
   revision = "d6e3b3328b783f23731bc4d058875b0371ff8109"
 
 [[projects]]
@@ -28,19 +31,70 @@
 [[projects]]
   branch = "master"
   name = "github.com/docker/cli"
-  packages = ["cli/config/configfile","cli/config/credentials","opts"]
+  packages = [
+    "cli/config/configfile",
+    "cli/config/credentials",
+    "opts"
+  ]
   revision = "6a2b9d0267b071733e11281b48de4f6bb16e9794"
 
 [[projects]]
   branch = "master"
   name = "github.com/docker/distribution"
-  packages = [".","digestset","manifest","manifest/manifestlist","manifest/schema1","manifest/schema2","reference","registry/api/errcode","registry/api/v2","registry/client","registry/client/auth","registry/client/auth/challenge","registry/client/transport","registry/storage/cache","registry/storage/cache/memory"]
+  packages = [
+    ".",
+    "digestset",
+    "manifest",
+    "manifest/manifestlist",
+    "manifest/schema1",
+    "manifest/schema2",
+    "reference",
+    "registry/api/errcode",
+    "registry/api/v2",
+    "registry/client",
+    "registry/client/auth",
+    "registry/client/auth/challenge",
+    "registry/client/transport",
+    "registry/storage/cache",
+    "registry/storage/cache/memory"
+  ]
   revision = "f4118485915abb8b163442717326597908eee6aa"
 
 [[projects]]
   branch = "master"
   name = "github.com/docker/docker"
-  packages = ["api","api/types","api/types/blkiodev","api/types/container","api/types/events","api/types/filters","api/types/image","api/types/mount","api/types/network","api/types/registry","api/types/strslice","api/types/swarm","api/types/swarm/runtime","api/types/time","api/types/versions","api/types/volume","client","pkg/homedir","pkg/idtools","pkg/ioutils","pkg/jsonmessage","pkg/longpath","pkg/mount","pkg/stringid","pkg/system","pkg/tarsum","pkg/term","pkg/term/windows","registry","registry/resumable"]
+  packages = [
+    "api",
+    "api/types",
+    "api/types/blkiodev",
+    "api/types/container",
+    "api/types/events",
+    "api/types/filters",
+    "api/types/image",
+    "api/types/mount",
+    "api/types/network",
+    "api/types/registry",
+    "api/types/strslice",
+    "api/types/swarm",
+    "api/types/swarm/runtime",
+    "api/types/time",
+    "api/types/versions",
+    "api/types/volume",
+    "client",
+    "pkg/homedir",
+    "pkg/idtools",
+    "pkg/ioutils",
+    "pkg/jsonmessage",
+    "pkg/longpath",
+    "pkg/mount",
+    "pkg/stringid",
+    "pkg/system",
+    "pkg/tarsum",
+    "pkg/term",
+    "pkg/term/windows",
+    "registry",
+    "registry/resumable"
+  ]
   revision = "1cea9d3bdb427bbdd7f14c6b11a3f6cef332bd34"
 
 [[projects]]
@@ -51,21 +105,29 @@
 
 [[projects]]
   name = "github.com/docker/docker-credential-helpers"
-  packages = ["client","credentials","pass"]
+  packages = [
+    "client",
+    "credentials",
+    "pass"
+  ]
   revision = "d68f9aeca33f5fd3f08eeae5e9d175edf4e731d1"
   version = "v0.6.0"
 
 [[projects]]
+  branch = "master"
   name = "github.com/docker/go-connections"
-  packages = ["nat","sockets","tlsconfig"]
-  revision = "3ede32e2033de7505e6500d6c868c2b9ed9f169d"
-  version = "v0.3.0"
+  packages = [
+    "nat",
+    "sockets",
+    "tlsconfig"
+  ]
+  revision = "7395e3f8aa162843a74ed6d48e79627d9792ac55"
 
 [[projects]]
+  branch = "master"
   name = "github.com/docker/go-units"
   packages = ["."]
-  revision = "0dadbb0345b35ec7ef35e228dabb8de89a65bf52"
-  version = "v0.3.2"
+  revision = "47565b4f722fb6ceae66b95f853feed578a4a51c"
 
 [[projects]]
   branch = "master"
@@ -79,6 +141,17 @@
   revision = "342cbe0a04158f6dcb03ca0079991a51a4248c02"
   version = "v0.5"
 
+[[projects]]
+  name = "github.com/google/go-cmp"
+  packages = [
+    "cmp",
+    "cmp/internal/diff",
+    "cmp/internal/function",
+    "cmp/internal/value"
+  ]
+  revision = "3af367b6b30c263d47e8895973edcca9a49cf029"
+  version = "v0.2.0"
+
 [[projects]]
   name = "github.com/gorilla/context"
   packages = ["."]
@@ -105,7 +178,10 @@
 
 [[projects]]
   name = "github.com/opencontainers/image-spec"
-  packages = ["specs-go","specs-go/v1"]
+  packages = [
+    "specs-go",
+    "specs-go/v1"
+  ]
   revision = "d60099175f88c47cd379c4738d158884749ed235"
   version = "v1.0.1"
 
@@ -148,18 +224,25 @@
 [[projects]]
   branch = "master"
   name = "golang.org/x/net"
-  packages = ["context","context/ctxhttp","proxy"]
+  packages = [
+    "context",
+    "context/ctxhttp",
+    "proxy"
+  ]
   revision = "d866cfc389cec985d6fda2859936a575a55a3ab6"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/sys"
-  packages = ["unix","windows"]
+  packages = [
+    "unix",
+    "windows"
+  ]
   revision = "1d2aa6dbdea45adaaebb9905d0666e4537563829"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "bd467a8b1c9177a2491972142ea4c11d27e3c77f9283b6ff9b207952c6af9f3c"
+  inputs-digest = "2151e0ead56d8b94d4226dd2d88ef8f9c881c7cabafad74b23bf439b40936327"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -36,19 +36,19 @@
   name = "github.com/docker/docker-ce"
   branch = "master"
 
-[[constraint]]
+[[override]]
   name = "github.com/docker/cli"
   branch = "master"
 
-[[constraint]]
+[[override]]
   name = "github.com/docker/docker-credentials-helpers"
   branch = "master"
 
-[[constraint]]
+[[override]]
   name = "github.com/docker/go-connections"
   branch = "master"
 
-[[constraint]]
+[[override]]
   name = "github.com/docker/go-units"
   branch = "master"
 

repoutils/repoutils.go

@@ -30,7 +30,7 @@ func GetAuthConfig(username, password, registry string) (types.AuthConfig, error
 
 	dcfg, err := config.Load(config.Dir())
 	if err != nil {
-		return types.AuthConfig{}, fmt.Errorf("Loading config file failed: %v", err)
+		return types.AuthConfig{}, fmt.Errorf("Loading config file from %s failed: %v", config.Dir(), err)
 	}
 
 	// return error early if there are no auths saved

repoutils/repoutils_test.go

@@ -4,8 +4,44 @@ import (
 	"testing"
 
 	"github.com/docker/distribution/reference"
+	"github.com/docker/docker/api/types"
+	"github.com/google/go-cmp/cmp"
 )
 
+func TestGetAuthConfig(t *testing.T) {
+	configTestcases := []struct {
+		name                         string
+		username, password, registry string
+		err                          error
+		config                       types.AuthConfig
+	}{
+		{
+			name:     "pass in all details",
+			username: "jess",
+			password: "password",
+			registry: "r.j3ss.co",
+			config: types.AuthConfig{
+				Username:      "jess",
+				Password:      "password",
+				ServerAddress: "r.j3ss.co",
+			},
+		},
+	}
+
+	for _, testcase := range configTestcases {
+		cfg, err := GetAuthConfig(testcase.username, testcase.password, testcase.registry)
+		if err != nil {
+			if err.Error() != testcase.err.Error() {
+				t.Fatalf("%q: expected err (%v), got err (%v)", testcase.name, testcase.err, err)
+			}
+			continue
+		}
+		if diff := cmp.Diff(testcase.config, cfg); diff != "" {
+			t.Errorf("%s: authconfig differs: (-got +want)\n%s", testcase.name, diff)
+		}
+	}
+}
+
 func TestGetRepoAndRef(t *testing.T) {
 	imageTestcases := []struct {
 		// input is the repository name or name component testcase

vendor/github.com/Microsoft/go-winio/archive/tar/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/Microsoft/go-winio/archive/tar/common.go

@@ -0,0 +1,344 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package tar implements access to tar archives.
+// It aims to cover most of the variations, including those produced
+// by GNU and BSD tars.
+//
+// References:
+//   http://www.freebsd.org/cgi/man.cgi?query=tar&sektion=5
+//   http://www.gnu.org/software/tar/manual/html_node/Standard.html
+//   http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html
+package tar
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"path"
+	"time"
+)
+
+const (
+	blockSize = 512
+
+	// Types
+	TypeReg           = '0'    // regular file
+	TypeRegA          = '\x00' // regular file
+	TypeLink          = '1'    // hard link
+	TypeSymlink       = '2'    // symbolic link
+	TypeChar          = '3'    // character device node
+	TypeBlock         = '4'    // block device node
+	TypeDir           = '5'    // directory
+	TypeFifo          = '6'    // fifo node
+	TypeCont          = '7'    // reserved
+	TypeXHeader       = 'x'    // extended header
+	TypeXGlobalHeader = 'g'    // global extended header
+	TypeGNULongName   = 'L'    // Next file has a long name
+	TypeGNULongLink   = 'K'    // Next file symlinks to a file w/ a long name
+	TypeGNUSparse     = 'S'    // sparse file
+)
+
+// A Header represents a single header in a tar archive.
+// Some fields may not be populated.
+type Header struct {
+	Name         string    // name of header file entry
+	Mode         int64     // permission and mode bits
+	Uid          int       // user id of owner
+	Gid          int       // group id of owner
+	Size         int64     // length in bytes
+	ModTime      time.Time // modified time
+	Typeflag     byte      // type of header entry
+	Linkname     string    // target name of link
+	Uname        string    // user name of owner
+	Gname        string    // group name of owner
+	Devmajor     int64     // major number of character or block device
+	Devminor     int64     // minor number of character or block device
+	AccessTime   time.Time // access time
+	ChangeTime   time.Time // status change time
+	CreationTime time.Time // creation time
+	Xattrs       map[string]string
+	Winheaders   map[string]string
+}
+
+// File name constants from the tar spec.
+const (
+	fileNameSize       = 100 // Maximum number of bytes in a standard tar name.
+	fileNamePrefixSize = 155 // Maximum number of ustar extension bytes.
+)
+
+// FileInfo returns an os.FileInfo for the Header.
+func (h *Header) FileInfo() os.FileInfo {
+	return headerFileInfo{h}
+}
+
+// headerFileInfo implements os.FileInfo.
+type headerFileInfo struct {
+	h *Header
+}
+
+func (fi headerFileInfo) Size() int64        { return fi.h.Size }
+func (fi headerFileInfo) IsDir() bool        { return fi.Mode().IsDir() }
+func (fi headerFileInfo) ModTime() time.Time { return fi.h.ModTime }
+func (fi headerFileInfo) Sys() interface{}   { return fi.h }
+
+// Name returns the base name of the file.
+func (fi headerFileInfo) Name() string {
+	if fi.IsDir() {
+		return path.Base(path.Clean(fi.h.Name))
+	}
+	return path.Base(fi.h.Name)
+}
+
+// Mode returns the permission and mode bits for the headerFileInfo.
+func (fi headerFileInfo) Mode() (mode os.FileMode) {
+	// Set file permission bits.
+	mode = os.FileMode(fi.h.Mode).Perm()
+
+	// Set setuid, setgid and sticky bits.
+	if fi.h.Mode&c_ISUID != 0 {
+		// setuid
+		mode |= os.ModeSetuid
+	}
+	if fi.h.Mode&c_ISGID != 0 {
+		// setgid
+		mode |= os.ModeSetgid
+	}
+	if fi.h.Mode&c_ISVTX != 0 {
+		// sticky
+		mode |= os.ModeSticky
+	}
+
+	// Set file mode bits.
+	// clear perm, setuid, setgid and sticky bits.
+	m := os.FileMode(fi.h.Mode) &^ 07777
+	if m == c_ISDIR {
+		// directory
+		mode |= os.ModeDir
+	}
+	if m == c_ISFIFO {
+		// named pipe (FIFO)
+		mode |= os.ModeNamedPipe
+	}
+	if m == c_ISLNK {
+		// symbolic link
+		mode |= os.ModeSymlink
+	}
+	if m == c_ISBLK {
+		// device file
+		mode |= os.ModeDevice
+	}
+	if m == c_ISCHR {
+		// Unix character device
+		mode |= os.ModeDevice
+		mode |= os.ModeCharDevice
+	}
+	if m == c_ISSOCK {
+		// Unix domain socket
+		mode |= os.ModeSocket
+	}
+
+	switch fi.h.Typeflag {
+	case TypeSymlink:
+		// symbolic link
+		mode |= os.ModeSymlink
+	case TypeChar:
+		// character device node
+		mode |= os.ModeDevice
+		mode |= os.ModeCharDevice
+	case TypeBlock:
+		// block device node
+		mode |= os.ModeDevice
+	case TypeDir:
+		// directory
+		mode |= os.ModeDir
+	case TypeFifo:
+		// fifo node
+		mode |= os.ModeNamedPipe
+	}
+
+	return mode
+}
+
+// sysStat, if non-nil, populates h from system-dependent fields of fi.
+var sysStat func(fi os.FileInfo, h *Header) error
+
+// Mode constants from the tar spec.
+const (
+	c_ISUID  = 04000   // Set uid
+	c_ISGID  = 02000   // Set gid
+	c_ISVTX  = 01000   // Save text (sticky bit)
+	c_ISDIR  = 040000  // Directory
+	c_ISFIFO = 010000  // FIFO
+	c_ISREG  = 0100000 // Regular file
+	c_ISLNK  = 0120000 // Symbolic link
+	c_ISBLK  = 060000  // Block special file
+	c_ISCHR  = 020000  // Character special file
+	c_ISSOCK = 0140000 // Socket
+)
+
+// Keywords for the PAX Extended Header
+const (
+	paxAtime        = "atime"
+	paxCharset      = "charset"
+	paxComment      = "comment"
+	paxCtime        = "ctime" // please note that ctime is not a valid pax header.
+	paxCreationTime = "LIBARCHIVE.creationtime"
+	paxGid          = "gid"
+	paxGname        = "gname"
+	paxLinkpath     = "linkpath"
+	paxMtime        = "mtime"
+	paxPath         = "path"
+	paxSize         = "size"
+	paxUid          = "uid"
+	paxUname        = "uname"
+	paxXattr        = "SCHILY.xattr."
+	paxWindows      = "MSWINDOWS."
+	paxNone         = ""
+)
+
+// FileInfoHeader creates a partially-populated Header from fi.
+// If fi describes a symlink, FileInfoHeader records link as the link target.
+// If fi describes a directory, a slash is appended to the name.
+// Because os.FileInfo's Name method returns only the base name of
+// the file it describes, it may be necessary to modify the Name field
+// of the returned header to provide the full path name of the file.
+func FileInfoHeader(fi os.FileInfo, link string) (*Header, error) {
+	if fi == nil {
+		return nil, errors.New("tar: FileInfo is nil")
+	}
+	fm := fi.Mode()
+	h := &Header{
+		Name:    fi.Name(),
+		ModTime: fi.ModTime(),
+		Mode:    int64(fm.Perm()), // or'd with c_IS* constants later
+	}
+	switch {
+	case fm.IsRegular():
+		h.Mode |= c_ISREG
+		h.Typeflag = TypeReg
+		h.Size = fi.Size()
+	case fi.IsDir():
+		h.Typeflag = TypeDir
+		h.Mode |= c_ISDIR
+		h.Name += "/"
+	case fm&os.ModeSymlink != 0:
+		h.Typeflag = TypeSymlink
+		h.Mode |= c_ISLNK
+		h.Linkname = link
+	case fm&os.ModeDevice != 0:
+		if fm&os.ModeCharDevice != 0 {
+			h.Mode |= c_ISCHR
+			h.Typeflag = TypeChar
+		} else {
+			h.Mode |= c_ISBLK
+			h.Typeflag = TypeBlock
+		}
+	case fm&os.ModeNamedPipe != 0:
+		h.Typeflag = TypeFifo
+		h.Mode |= c_ISFIFO
+	case fm&os.ModeSocket != 0:
+		h.Mode |= c_ISSOCK
+	default:
+		return nil, fmt.Errorf("archive/tar: unknown file mode %v", fm)
+	}
+	if fm&os.ModeSetuid != 0 {
+		h.Mode |= c_ISUID
+	}
+	if fm&os.ModeSetgid != 0 {
+		h.Mode |= c_ISGID
+	}
+	if fm&os.ModeSticky != 0 {
+		h.Mode |= c_ISVTX
+	}
+	// If possible, populate additional fields from OS-specific
+	// FileInfo fields.
+	if sys, ok := fi.Sys().(*Header); ok {
+		// This FileInfo came from a Header (not the OS). Use the
+		// original Header to populate all remaining fields.
+		h.Uid = sys.Uid
+		h.Gid = sys.Gid
+		h.Uname = sys.Uname
+		h.Gname = sys.Gname
+		h.AccessTime = sys.AccessTime
+		h.ChangeTime = sys.ChangeTime
+		if sys.Xattrs != nil {
+			h.Xattrs = make(map[string]string)
+			for k, v := range sys.Xattrs {
+				h.Xattrs[k] = v
+			}
+		}
+		if sys.Typeflag == TypeLink {
+			// hard link
+			h.Typeflag = TypeLink
+			h.Size = 0
+			h.Linkname = sys.Linkname
+		}
+	}
+	if sysStat != nil {
+		return h, sysStat(fi, h)
+	}
+	return h, nil
+}
+
+var zeroBlock = make([]byte, blockSize)
+
+// POSIX specifies a sum of the unsigned byte values, but the Sun tar uses signed byte values.
+// We compute and return both.
+func checksum(header []byte) (unsigned int64, signed int64) {
+	for i := 0; i < len(header); i++ {
+		if i == 148 {
+			// The chksum field (header[148:156]) is special: it should be treated as space bytes.
+			unsigned += ' ' * 8
+			signed += ' ' * 8
+			i += 7
+			continue
+		}
+		unsigned += int64(header[i])
+		signed += int64(int8(header[i]))
+	}
+	return
+}
+
+type slicer []byte
+
+func (sp *slicer) next(n int) (b []byte) {
+	s := *sp
+	b, *sp = s[0:n], s[n:]
+	return
+}
+
+func isASCII(s string) bool {
+	for _, c := range s {
+		if c >= 0x80 {
+			return false
+		}
+	}
+	return true
+}
+
+func toASCII(s string) string {
+	if isASCII(s) {
+		return s
+	}
+	var buf bytes.Buffer
+	for _, c := range s {
+		if c < 0x80 {
+			buf.WriteByte(byte(c))
+		}
+	}
+	return buf.String()
+}
+
+// isHeaderOnlyType checks if the given type flag is of the type that has no
+// data section even if a size is specified.
+func isHeaderOnlyType(flag byte) bool {
+	switch flag {
+	case TypeLink, TypeSymlink, TypeChar, TypeBlock, TypeDir, TypeFifo:
+		return true
+	default:
+		return false
+	}
+}

vendor/github.com/Microsoft/go-winio/archive/tar/example_test.go

@@ -0,0 +1,80 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar_test
+
+import (
+	"archive/tar"
+	"bytes"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+func Example() {
+	// Create a buffer to write our archive to.
+	buf := new(bytes.Buffer)
+
+	// Create a new tar archive.
+	tw := tar.NewWriter(buf)
+
+	// Add some files to the archive.
+	var files = []struct {
+		Name, Body string
+	}{
+		{"readme.txt", "This archive contains some text files."},
+		{"gopher.txt", "Gopher names:\nGeorge\nGeoffrey\nGonzo"},
+		{"todo.txt", "Get animal handling license."},
+	}
+	for _, file := range files {
+		hdr := &tar.Header{
+			Name: file.Name,
+			Mode: 0600,
+			Size: int64(len(file.Body)),
+		}
+		if err := tw.WriteHeader(hdr); err != nil {
+			log.Fatalln(err)
+		}
+		if _, err := tw.Write([]byte(file.Body)); err != nil {
+			log.Fatalln(err)
+		}
+	}
+	// Make sure to check the error on Close.
+	if err := tw.Close(); err != nil {
+		log.Fatalln(err)
+	}
+
+	// Open the tar archive for reading.
+	r := bytes.NewReader(buf.Bytes())
+	tr := tar.NewReader(r)
+
+	// Iterate through the files in the archive.
+	for {
+		hdr, err := tr.Next()
+		if err == io.EOF {
+			// end of tar archive
+			break
+		}
+		if err != nil {
+			log.Fatalln(err)
+		}
+		fmt.Printf("Contents of %s:\n", hdr.Name)
+		if _, err := io.Copy(os.Stdout, tr); err != nil {
+			log.Fatalln(err)
+		}
+		fmt.Println()
+	}
+
+	// Output:
+	// Contents of readme.txt:
+	// This archive contains some text files.
+	// Contents of gopher.txt:
+	// Gopher names:
+	// George
+	// Geoffrey
+	// Gonzo
+	// Contents of todo.txt:
+	// Get animal handling license.
+}

vendor/github.com/Microsoft/go-winio/archive/tar/stat_atim.go

@@ -0,0 +1,20 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux dragonfly openbsd solaris
+
+package tar
+
+import (
+	"syscall"
+	"time"
+)
+
+func statAtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Atim.Unix())
+}
+
+func statCtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Ctim.Unix())
+}

vendor/github.com/Microsoft/go-winio/archive/tar/stat_atimespec.go

@@ -0,0 +1,20 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd netbsd
+
+package tar
+
+import (
+	"syscall"
+	"time"
+)
+
+func statAtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Atimespec.Unix())
+}
+
+func statCtime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Ctimespec.Unix())
+}

vendor/github.com/Microsoft/go-winio/archive/tar/stat_unix.go

@@ -0,0 +1,32 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux darwin dragonfly freebsd openbsd netbsd solaris
+
+package tar
+
+import (
+	"os"
+	"syscall"
+)
+
+func init() {
+	sysStat = statUnix
+}
+
+func statUnix(fi os.FileInfo, h *Header) error {
+	sys, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return nil
+	}
+	h.Uid = int(sys.Uid)
+	h.Gid = int(sys.Gid)
+	// TODO(bradfitz): populate username & group.  os/user
+	// doesn't cache LookupId lookups, and lacks group
+	// lookup functions.
+	h.AccessTime = statAtime(sys)
+	h.ChangeTime = statCtime(sys)
+	// TODO(bradfitz): major/minor device numbers?
+	return nil
+}

vendor/github.com/Microsoft/go-winio/archive/tar/tar_test.go

@@ -0,0 +1,325 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path"
+	"reflect"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestFileInfoHeader(t *testing.T) {
+	fi, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	h, err := FileInfoHeader(fi, "")
+	if err != nil {
+		t.Fatalf("FileInfoHeader: %v", err)
+	}
+	if g, e := h.Name, "small.txt"; g != e {
+		t.Errorf("Name = %q; want %q", g, e)
+	}
+	if g, e := h.Mode, int64(fi.Mode().Perm())|c_ISREG; g != e {
+		t.Errorf("Mode = %#o; want %#o", g, e)
+	}
+	if g, e := h.Size, int64(5); g != e {
+		t.Errorf("Size = %v; want %v", g, e)
+	}
+	if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
+		t.Errorf("ModTime = %v; want %v", g, e)
+	}
+	// FileInfoHeader should error when passing nil FileInfo
+	if _, err := FileInfoHeader(nil, ""); err == nil {
+		t.Fatalf("Expected error when passing nil to FileInfoHeader")
+	}
+}
+
+func TestFileInfoHeaderDir(t *testing.T) {
+	fi, err := os.Stat("testdata")
+	if err != nil {
+		t.Fatal(err)
+	}
+	h, err := FileInfoHeader(fi, "")
+	if err != nil {
+		t.Fatalf("FileInfoHeader: %v", err)
+	}
+	if g, e := h.Name, "testdata/"; g != e {
+		t.Errorf("Name = %q; want %q", g, e)
+	}
+	// Ignoring c_ISGID for golang.org/issue/4867
+	if g, e := h.Mode&^c_ISGID, int64(fi.Mode().Perm())|c_ISDIR; g != e {
+		t.Errorf("Mode = %#o; want %#o", g, e)
+	}
+	if g, e := h.Size, int64(0); g != e {
+		t.Errorf("Size = %v; want %v", g, e)
+	}
+	if g, e := h.ModTime, fi.ModTime(); !g.Equal(e) {
+		t.Errorf("ModTime = %v; want %v", g, e)
+	}
+}
+
+func TestFileInfoHeaderSymlink(t *testing.T) {
+	h, err := FileInfoHeader(symlink{}, "some-target")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if g, e := h.Name, "some-symlink"; g != e {
+		t.Errorf("Name = %q; want %q", g, e)
+	}
+	if g, e := h.Linkname, "some-target"; g != e {
+		t.Errorf("Linkname = %q; want %q", g, e)
+	}
+}
+
+type symlink struct{}
+
+func (symlink) Name() string       { return "some-symlink" }
+func (symlink) Size() int64        { return 0 }
+func (symlink) Mode() os.FileMode  { return os.ModeSymlink }
+func (symlink) ModTime() time.Time { return time.Time{} }
+func (symlink) IsDir() bool        { return false }
+func (symlink) Sys() interface{}   { return nil }
+
+func TestRoundTrip(t *testing.T) {
+	data := []byte("some file contents")
+
+	var b bytes.Buffer
+	tw := NewWriter(&b)
+	hdr := &Header{
+		Name:    "file.txt",
+		Uid:     1 << 21, // too big for 8 octal digits
+		Size:    int64(len(data)),
+		ModTime: time.Now(),
+	}
+	// tar only supports second precision.
+	hdr.ModTime = hdr.ModTime.Add(-time.Duration(hdr.ModTime.Nanosecond()) * time.Nanosecond)
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("tw.WriteHeader: %v", err)
+	}
+	if _, err := tw.Write(data); err != nil {
+		t.Fatalf("tw.Write: %v", err)
+	}
+	if err := tw.Close(); err != nil {
+		t.Fatalf("tw.Close: %v", err)
+	}
+
+	// Read it back.
+	tr := NewReader(&b)
+	rHdr, err := tr.Next()
+	if err != nil {
+		t.Fatalf("tr.Next: %v", err)
+	}
+	if !reflect.DeepEqual(rHdr, hdr) {
+		t.Errorf("Header mismatch.\n got %+v\nwant %+v", rHdr, hdr)
+	}
+	rData, err := ioutil.ReadAll(tr)
+	if err != nil {
+		t.Fatalf("Read: %v", err)
+	}
+	if !bytes.Equal(rData, data) {
+		t.Errorf("Data mismatch.\n got %q\nwant %q", rData, data)
+	}
+}
+
+type headerRoundTripTest struct {
+	h  *Header
+	fm os.FileMode
+}
+
+func TestHeaderRoundTrip(t *testing.T) {
+	golden := []headerRoundTripTest{
+		// regular file.
+		{
+			h: &Header{
+				Name:     "test.txt",
+				Mode:     0644 | c_ISREG,
+				Size:     12,
+				ModTime:  time.Unix(1360600916, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0644,
+		},
+		// symbolic link.
+		{
+			h: &Header{
+				Name:     "link.txt",
+				Mode:     0777 | c_ISLNK,
+				Size:     0,
+				ModTime:  time.Unix(1360600852, 0),
+				Typeflag: TypeSymlink,
+			},
+			fm: 0777 | os.ModeSymlink,
+		},
+		// character device node.
+		{
+			h: &Header{
+				Name:     "dev/null",
+				Mode:     0666 | c_ISCHR,
+				Size:     0,
+				ModTime:  time.Unix(1360578951, 0),
+				Typeflag: TypeChar,
+			},
+			fm: 0666 | os.ModeDevice | os.ModeCharDevice,
+		},
+		// block device node.
+		{
+			h: &Header{
+				Name:     "dev/sda",
+				Mode:     0660 | c_ISBLK,
+				Size:     0,
+				ModTime:  time.Unix(1360578954, 0),
+				Typeflag: TypeBlock,
+			},
+			fm: 0660 | os.ModeDevice,
+		},
+		// directory.
+		{
+			h: &Header{
+				Name:     "dir/",
+				Mode:     0755 | c_ISDIR,
+				Size:     0,
+				ModTime:  time.Unix(1360601116, 0),
+				Typeflag: TypeDir,
+			},
+			fm: 0755 | os.ModeDir,
+		},
+		// fifo node.
+		{
+			h: &Header{
+				Name:     "dev/initctl",
+				Mode:     0600 | c_ISFIFO,
+				Size:     0,
+				ModTime:  time.Unix(1360578949, 0),
+				Typeflag: TypeFifo,
+			},
+			fm: 0600 | os.ModeNamedPipe,
+		},
+		// setuid.
+		{
+			h: &Header{
+				Name:     "bin/su",
+				Mode:     0755 | c_ISREG | c_ISUID,
+				Size:     23232,
+				ModTime:  time.Unix(1355405093, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0755 | os.ModeSetuid,
+		},
+		// setguid.
+		{
+			h: &Header{
+				Name:     "group.txt",
+				Mode:     0750 | c_ISREG | c_ISGID,
+				Size:     0,
+				ModTime:  time.Unix(1360602346, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0750 | os.ModeSetgid,
+		},
+		// sticky.
+		{
+			h: &Header{
+				Name:     "sticky.txt",
+				Mode:     0600 | c_ISREG | c_ISVTX,
+				Size:     7,
+				ModTime:  time.Unix(1360602540, 0),
+				Typeflag: TypeReg,
+			},
+			fm: 0600 | os.ModeSticky,
+		},
+		// hard link.
+		{
+			h: &Header{
+				Name:     "hard.txt",
+				Mode:     0644 | c_ISREG,
+				Size:     0,
+				Linkname: "file.txt",
+				ModTime:  time.Unix(1360600916, 0),
+				Typeflag: TypeLink,
+			},
+			fm: 0644,
+		},
+		// More information.
+		{
+			h: &Header{
+				Name:     "info.txt",
+				Mode:     0600 | c_ISREG,
+				Size:     0,
+				Uid:      1000,
+				Gid:      1000,
+				ModTime:  time.Unix(1360602540, 0),
+				Uname:    "slartibartfast",
+				Gname:    "users",
+				Typeflag: TypeReg,
+			},
+			fm: 0600,
+		},
+	}
+
+	for i, g := range golden {
+		fi := g.h.FileInfo()
+		h2, err := FileInfoHeader(fi, "")
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+		if strings.Contains(fi.Name(), "/") {
+			t.Errorf("FileInfo of %q contains slash: %q", g.h.Name, fi.Name())
+		}
+		name := path.Base(g.h.Name)
+		if fi.IsDir() {
+			name += "/"
+		}
+		if got, want := h2.Name, name; got != want {
+			t.Errorf("i=%d: Name: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.Size, g.h.Size; got != want {
+			t.Errorf("i=%d: Size: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.Uid, g.h.Uid; got != want {
+			t.Errorf("i=%d: Uid: got %d, want %d", i, got, want)
+		}
+		if got, want := h2.Gid, g.h.Gid; got != want {
+			t.Errorf("i=%d: Gid: got %d, want %d", i, got, want)
+		}
+		if got, want := h2.Uname, g.h.Uname; got != want {
+			t.Errorf("i=%d: Uname: got %q, want %q", i, got, want)
+		}
+		if got, want := h2.Gname, g.h.Gname; got != want {
+			t.Errorf("i=%d: Gname: got %q, want %q", i, got, want)
+		}
+		if got, want := h2.Linkname, g.h.Linkname; got != want {
+			t.Errorf("i=%d: Linkname: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.Typeflag, g.h.Typeflag; got != want {
+			t.Logf("%#v %#v", g.h, fi.Sys())
+			t.Errorf("i=%d: Typeflag: got %q, want %q", i, got, want)
+		}
+		if got, want := h2.Mode, g.h.Mode; got != want {
+			t.Errorf("i=%d: Mode: got %o, want %o", i, got, want)
+		}
+		if got, want := fi.Mode(), g.fm; got != want {
+			t.Errorf("i=%d: fi.Mode: got %o, want %o", i, got, want)
+		}
+		if got, want := h2.AccessTime, g.h.AccessTime; got != want {
+			t.Errorf("i=%d: AccessTime: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.ChangeTime, g.h.ChangeTime; got != want {
+			t.Errorf("i=%d: ChangeTime: got %v, want %v", i, got, want)
+		}
+		if got, want := h2.ModTime, g.h.ModTime; got != want {
+			t.Errorf("i=%d: ModTime: got %v, want %v", i, got, want)
+		}
+		if sysh, ok := fi.Sys().(*Header); !ok || sysh != g.h {
+			t.Errorf("i=%d: Sys didn't return original *Header", i)
+		}
+	}
+}

vendor/github.com/Microsoft/go-winio/archive/tar/testdata/small.txt

@@ -0,0 +1 @@
+Kilts

vendor/github.com/Microsoft/go-winio/archive/tar/testdata/small2.txt

@@ -0,0 +1 @@
+Google.com

vendor/github.com/Microsoft/go-winio/archive/tar/writer.go

@@ -0,0 +1,444 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar
+
+// TODO(dsymonds):
+// - catch more errors (no first header, etc.)
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"path"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+var (
+	ErrWriteTooLong    = errors.New("archive/tar: write too long")
+	ErrFieldTooLong    = errors.New("archive/tar: header field too long")
+	ErrWriteAfterClose = errors.New("archive/tar: write after close")
+	errInvalidHeader   = errors.New("archive/tar: header field too long or contains invalid values")
+)
+
+// A Writer provides sequential writing of a tar archive in POSIX.1 format.
+// A tar archive consists of a sequence of files.
+// Call WriteHeader to begin a new file, and then call Write to supply that file's data,
+// writing at most hdr.Size bytes in total.
+type Writer struct {
+	w          io.Writer
+	err        error
+	nb         int64 // number of unwritten bytes for current file entry
+	pad        int64 // amount of padding to write after current file entry
+	closed     bool
+	usedBinary bool            // whether the binary numeric field extension was used
+	preferPax  bool            // use pax header instead of binary numeric header
+	hdrBuff    [blockSize]byte // buffer to use in writeHeader when writing a regular header
+	paxHdrBuff [blockSize]byte // buffer to use in writeHeader when writing a pax header
+}
+
+type formatter struct {
+	err error // Last error seen
+}
+
+// NewWriter creates a new Writer writing to w.
+func NewWriter(w io.Writer) *Writer { return &Writer{w: w, preferPax: true} }
+
+// Flush finishes writing the current file (optional).
+func (tw *Writer) Flush() error {
+	if tw.nb > 0 {
+		tw.err = fmt.Errorf("archive/tar: missed writing %d bytes", tw.nb)
+		return tw.err
+	}
+
+	n := tw.nb + tw.pad
+	for n > 0 && tw.err == nil {
+		nr := n
+		if nr > blockSize {
+			nr = blockSize
+		}
+		var nw int
+		nw, tw.err = tw.w.Write(zeroBlock[0:nr])
+		n -= int64(nw)
+	}
+	tw.nb = 0
+	tw.pad = 0
+	return tw.err
+}
+
+// Write s into b, terminating it with a NUL if there is room.
+func (f *formatter) formatString(b []byte, s string) {
+	if len(s) > len(b) {
+		f.err = ErrFieldTooLong
+		return
+	}
+	ascii := toASCII(s)
+	copy(b, ascii)
+	if len(ascii) < len(b) {
+		b[len(ascii)] = 0
+	}
+}
+
+// Encode x as an octal ASCII string and write it into b with leading zeros.
+func (f *formatter) formatOctal(b []byte, x int64) {
+	s := strconv.FormatInt(x, 8)
+	// leading zeros, but leave room for a NUL.
+	for len(s)+1 < len(b) {
+		s = "0" + s
+	}
+	f.formatString(b, s)
+}
+
+// fitsInBase256 reports whether x can be encoded into n bytes using base-256
+// encoding. Unlike octal encoding, base-256 encoding does not require that the
+// string ends with a NUL character. Thus, all n bytes are available for output.
+//
+// If operating in binary mode, this assumes strict GNU binary mode; which means
+// that the first byte can only be either 0x80 or 0xff. Thus, the first byte is
+// equivalent to the sign bit in two's complement form.
+func fitsInBase256(n int, x int64) bool {
+	var binBits = uint(n-1) * 8
+	return n >= 9 || (x >= -1<<binBits && x < 1<<binBits)
+}
+
+// Write x into b, as binary (GNUtar/star extension).
+func (f *formatter) formatNumeric(b []byte, x int64) {
+	if fitsInBase256(len(b), x) {
+		for i := len(b) - 1; i >= 0; i-- {
+			b[i] = byte(x)
+			x >>= 8
+		}
+		b[0] |= 0x80 // Highest bit indicates binary format
+		return
+	}
+
+	f.formatOctal(b, 0) // Last resort, just write zero
+	f.err = ErrFieldTooLong
+}
+
+var (
+	minTime = time.Unix(0, 0)
+	// There is room for 11 octal digits (33 bits) of mtime.
+	maxTime = minTime.Add((1<<33 - 1) * time.Second)
+)
+
+// WriteHeader writes hdr and prepares to accept the file's contents.
+// WriteHeader calls Flush if it is not the first header.
+// Calling after a Close will return ErrWriteAfterClose.
+func (tw *Writer) WriteHeader(hdr *Header) error {
+	return tw.writeHeader(hdr, true)
+}
+
+// WriteHeader writes hdr and prepares to accept the file's contents.
+// WriteHeader calls Flush if it is not the first header.
+// Calling after a Close will return ErrWriteAfterClose.
+// As this method is called internally by writePax header to allow it to
+// suppress writing the pax header.
+func (tw *Writer) writeHeader(hdr *Header, allowPax bool) error {
+	if tw.closed {
+		return ErrWriteAfterClose
+	}
+	if tw.err == nil {
+		tw.Flush()
+	}
+	if tw.err != nil {
+		return tw.err
+	}
+
+	// a map to hold pax header records, if any are needed
+	paxHeaders := make(map[string]string)
+
+	// TODO(shanemhansen): we might want to use PAX headers for
+	// subsecond time resolution, but for now let's just capture
+	// too long fields or non ascii characters
+
+	var f formatter
+	var header []byte
+
+	// We need to select which scratch buffer to use carefully,
+	// since this method is called recursively to write PAX headers.
+	// If allowPax is true, this is the non-recursive call, and we will use hdrBuff.
+	// If allowPax is false, we are being called by writePAXHeader, and hdrBuff is
+	// already being used by the non-recursive call, so we must use paxHdrBuff.
+	header = tw.hdrBuff[:]
+	if !allowPax {
+		header = tw.paxHdrBuff[:]
+	}
+	copy(header, zeroBlock)
+	s := slicer(header)
+
+	// Wrappers around formatter that automatically sets paxHeaders if the
+	// argument extends beyond the capacity of the input byte slice.
+	var formatString = func(b []byte, s string, paxKeyword string) {
+		needsPaxHeader := paxKeyword != paxNone && len(s) > len(b) || !isASCII(s)
+		if needsPaxHeader {
+			paxHeaders[paxKeyword] = s
+			return
+		}
+		f.formatString(b, s)
+	}
+	var formatNumeric = func(b []byte, x int64, paxKeyword string) {
+		// Try octal first.
+		s := strconv.FormatInt(x, 8)
+		if len(s) < len(b) {
+			f.formatOctal(b, x)
+			return
+		}
+
+		// If it is too long for octal, and PAX is preferred, use a PAX header.
+		if paxKeyword != paxNone && tw.preferPax {
+			f.formatOctal(b, 0)
+			s := strconv.FormatInt(x, 10)
+			paxHeaders[paxKeyword] = s
+			return
+		}
+
+		tw.usedBinary = true
+		f.formatNumeric(b, x)
+	}
+	var formatTime = func(b []byte, t time.Time, paxKeyword string) {
+		var unixTime int64
+		if !t.Before(minTime) && !t.After(maxTime) {
+			unixTime = t.Unix()
+		}
+		formatNumeric(b, unixTime, paxNone)
+
+		// Write a PAX header if the time didn't fit precisely.
+		if paxKeyword != "" && tw.preferPax && allowPax && (t.Nanosecond() != 0 || !t.Before(minTime) || !t.After(maxTime)) {
+			paxHeaders[paxKeyword] = formatPAXTime(t)
+		}
+	}
+
+	// keep a reference to the filename to allow to overwrite it later if we detect that we can use ustar longnames instead of pax
+	pathHeaderBytes := s.next(fileNameSize)
+
+	formatString(pathHeaderBytes, hdr.Name, paxPath)
+
+	f.formatOctal(s.next(8), hdr.Mode)               // 100:108
+	formatNumeric(s.next(8), int64(hdr.Uid), paxUid) // 108:116
+	formatNumeric(s.next(8), int64(hdr.Gid), paxGid) // 116:124
+	formatNumeric(s.next(12), hdr.Size, paxSize)     // 124:136
+	formatTime(s.next(12), hdr.ModTime, paxMtime)    // 136:148
+	s.next(8)                                        // chksum (148:156)
+	s.next(1)[0] = hdr.Typeflag                      // 156:157
+
+	formatString(s.next(100), hdr.Linkname, paxLinkpath)
+
+	copy(s.next(8), []byte("ustar\x0000"))          // 257:265
+	formatString(s.next(32), hdr.Uname, paxUname)   // 265:297
+	formatString(s.next(32), hdr.Gname, paxGname)   // 297:329
+	formatNumeric(s.next(8), hdr.Devmajor, paxNone) // 329:337
+	formatNumeric(s.next(8), hdr.Devminor, paxNone) // 337:345
+
+	// keep a reference to the prefix to allow to overwrite it later if we detect that we can use ustar longnames instead of pax
+	prefixHeaderBytes := s.next(155)
+	formatString(prefixHeaderBytes, "", paxNone) // 345:500  prefix
+
+	// Use the GNU magic instead of POSIX magic if we used any GNU extensions.
+	if tw.usedBinary {
+		copy(header[257:265], []byte("ustar  \x00"))
+	}
+
+	_, paxPathUsed := paxHeaders[paxPath]
+	// try to use a ustar header when only the name is too long
+	if !tw.preferPax && len(paxHeaders) == 1 && paxPathUsed {
+		prefix, suffix, ok := splitUSTARPath(hdr.Name)
+		if ok {
+			// Since we can encode in USTAR format, disable PAX header.
+			delete(paxHeaders, paxPath)
+
+			// Update the path fields
+			formatString(pathHeaderBytes, suffix, paxNone)
+			formatString(prefixHeaderBytes, prefix, paxNone)
+		}
+	}
+
+	// The chksum field is terminated by a NUL and a space.
+	// This is different from the other octal fields.
+	chksum, _ := checksum(header)
+	f.formatOctal(header[148:155], chksum) // Never fails
+	header[155] = ' '
+
+	// Check if there were any formatting errors.
+	if f.err != nil {
+		tw.err = f.err
+		return tw.err
+	}
+
+	if allowPax {
+		if !hdr.AccessTime.IsZero() {
+			paxHeaders[paxAtime] = formatPAXTime(hdr.AccessTime)
+		}
+		if !hdr.ChangeTime.IsZero() {
+			paxHeaders[paxCtime] = formatPAXTime(hdr.ChangeTime)
+		}
+		if !hdr.CreationTime.IsZero() {
+			paxHeaders[paxCreationTime] = formatPAXTime(hdr.CreationTime)
+		}
+		for k, v := range hdr.Xattrs {
+			paxHeaders[paxXattr+k] = v
+		}
+		for k, v := range hdr.Winheaders {
+			paxHeaders[paxWindows+k] = v
+		}
+	}
+
+	if len(paxHeaders) > 0 {
+		if !allowPax {
+			return errInvalidHeader
+		}
+		if err := tw.writePAXHeader(hdr, paxHeaders); err != nil {
+			return err
+		}
+	}
+	tw.nb = int64(hdr.Size)
+	tw.pad = (blockSize - (tw.nb % blockSize)) % blockSize
+
+	_, tw.err = tw.w.Write(header)
+	return tw.err
+}
+
+func formatPAXTime(t time.Time) string {
+	sec := t.Unix()
+	usec := t.Nanosecond()
+	s := strconv.FormatInt(sec, 10)
+	if usec != 0 {
+		s = fmt.Sprintf("%s.%09d", s, usec)
+	}
+	return s
+}
+
+// splitUSTARPath splits a path according to USTAR prefix and suffix rules.
+// If the path is not splittable, then it will return ("", "", false).
+func splitUSTARPath(name string) (prefix, suffix string, ok bool) {
+	length := len(name)
+	if length <= fileNameSize || !isASCII(name) {
+		return "", "", false
+	} else if length > fileNamePrefixSize+1 {
+		length = fileNamePrefixSize + 1
+	} else if name[length-1] == '/' {
+		length--
+	}
+
+	i := strings.LastIndex(name[:length], "/")
+	nlen := len(name) - i - 1 // nlen is length of suffix
+	plen := i                 // plen is length of prefix
+	if i <= 0 || nlen > fileNameSize || nlen == 0 || plen > fileNamePrefixSize {
+		return "", "", false
+	}
+	return name[:i], name[i+1:], true
+}
+
+// writePaxHeader writes an extended pax header to the
+// archive.
+func (tw *Writer) writePAXHeader(hdr *Header, paxHeaders map[string]string) error {
+	// Prepare extended header
+	ext := new(Header)
+	ext.Typeflag = TypeXHeader
+	// Setting ModTime is required for reader parsing to
+	// succeed, and seems harmless enough.
+	ext.ModTime = hdr.ModTime
+	// The spec asks that we namespace our pseudo files
+	// with the current pid.  However, this results in differing outputs
+	// for identical inputs.  As such, the constant 0 is now used instead.
+	// golang.org/issue/12358
+	dir, file := path.Split(hdr.Name)
+	fullName := path.Join(dir, "PaxHeaders.0", file)
+
+	ascii := toASCII(fullName)
+	if len(ascii) > 100 {
+		ascii = ascii[:100]
+	}
+	ext.Name = ascii
+	// Construct the body
+	var buf bytes.Buffer
+
+	// Keys are sorted before writing to body to allow deterministic output.
+	var keys []string
+	for k := range paxHeaders {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	for _, k := range keys {
+		fmt.Fprint(&buf, formatPAXRecord(k, paxHeaders[k]))
+	}
+
+	ext.Size = int64(len(buf.Bytes()))
+	if err := tw.writeHeader(ext, false); err != nil {
+		return err
+	}
+	if _, err := tw.Write(buf.Bytes()); err != nil {
+		return err
+	}
+	if err := tw.Flush(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// formatPAXRecord formats a single PAX record, prefixing it with the
+// appropriate length.
+func formatPAXRecord(k, v string) string {
+	const padding = 3 // Extra padding for ' ', '=', and '\n'
+	size := len(k) + len(v) + padding
+	size += len(strconv.Itoa(size))
+	record := fmt.Sprintf("%d %s=%s\n", size, k, v)
+
+	// Final adjustment if adding size field increased the record size.
+	if len(record) != size {
+		size = len(record)
+		record = fmt.Sprintf("%d %s=%s\n", size, k, v)
+	}
+	return record
+}
+
+// Write writes to the current entry in the tar archive.
+// Write returns the error ErrWriteTooLong if more than
+// hdr.Size bytes are written after WriteHeader.
+func (tw *Writer) Write(b []byte) (n int, err error) {
+	if tw.closed {
+		err = ErrWriteAfterClose
+		return
+	}
+	overwrite := false
+	if int64(len(b)) > tw.nb {
+		b = b[0:tw.nb]
+		overwrite = true
+	}
+	n, err = tw.w.Write(b)
+	tw.nb -= int64(n)
+	if err == nil && overwrite {
+		err = ErrWriteTooLong
+		return
+	}
+	tw.err = err
+	return
+}
+
+// Close closes the tar archive, flushing any unwritten
+// data to the underlying writer.
+func (tw *Writer) Close() error {
+	if tw.err != nil || tw.closed {
+		return tw.err
+	}
+	tw.Flush()
+	tw.closed = true
+	if tw.err != nil {
+		return tw.err
+	}
+
+	// trailer: two zero blocks
+	for i := 0; i < 2; i++ {
+		_, tw.err = tw.w.Write(zeroBlock)
+		if tw.err != nil {
+			break
+		}
+	}
+	return tw.err
+}

vendor/github.com/Microsoft/go-winio/archive/tar/writer_test.go

@@ -0,0 +1,739 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package tar
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math"
+	"os"
+	"reflect"
+	"sort"
+	"strings"
+	"testing"
+	"testing/iotest"
+	"time"
+)
+
+type writerTestEntry struct {
+	header   *Header
+	contents string
+}
+
+type writerTest struct {
+	file    string // filename of expected output
+	entries []*writerTestEntry
+}
+
+var writerTests = []*writerTest{
+	// The writer test file was produced with this command:
+	// tar (GNU tar) 1.26
+	//   ln -s small.txt link.txt
+	//   tar -b 1 --format=ustar -c -f writer.tar small.txt small2.txt link.txt
+	{
+		file: "testdata/writer.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     "small.txt",
+					Mode:     0640,
+					Uid:      73025,
+					Gid:      5000,
+					Size:     5,
+					ModTime:  time.Unix(1246508266, 0),
+					Typeflag: '0',
+					Uname:    "dsymonds",
+					Gname:    "eng",
+				},
+				contents: "Kilts",
+			},
+			{
+				header: &Header{
+					Name:     "small2.txt",
+					Mode:     0640,
+					Uid:      73025,
+					Gid:      5000,
+					Size:     11,
+					ModTime:  time.Unix(1245217492, 0),
+					Typeflag: '0',
+					Uname:    "dsymonds",
+					Gname:    "eng",
+				},
+				contents: "Google.com\n",
+			},
+			{
+				header: &Header{
+					Name:     "link.txt",
+					Mode:     0777,
+					Uid:      1000,
+					Gid:      1000,
+					Size:     0,
+					ModTime:  time.Unix(1314603082, 0),
+					Typeflag: '2',
+					Linkname: "small.txt",
+					Uname:    "strings",
+					Gname:    "strings",
+				},
+				// no contents
+			},
+		},
+	},
+	// The truncated test file was produced using these commands:
+	//   dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt
+	//   tar -b 1 -c -f- /tmp/16gig.txt | dd bs=512 count=8 > writer-big.tar
+	{
+		file: "testdata/writer-big.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     "tmp/16gig.txt",
+					Mode:     0640,
+					Uid:      73025,
+					Gid:      5000,
+					Size:     16 << 30,
+					ModTime:  time.Unix(1254699560, 0),
+					Typeflag: '0',
+					Uname:    "dsymonds",
+					Gname:    "eng",
+				},
+				// fake contents
+				contents: strings.Repeat("\x00", 4<<10),
+			},
+		},
+	},
+	// The truncated test file was produced using these commands:
+	//   dd if=/dev/zero bs=1048576 count=16384 > (longname/)*15 /16gig.txt
+	//   tar -b 1 -c -f- (longname/)*15 /16gig.txt | dd bs=512 count=8 > writer-big-long.tar
+	{
+		file: "testdata/writer-big-long.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     strings.Repeat("longname/", 15) + "16gig.txt",
+					Mode:     0644,
+					Uid:      1000,
+					Gid:      1000,
+					Size:     16 << 30,
+					ModTime:  time.Unix(1399583047, 0),
+					Typeflag: '0',
+					Uname:    "guillaume",
+					Gname:    "guillaume",
+				},
+				// fake contents
+				contents: strings.Repeat("\x00", 4<<10),
+			},
+		},
+	},
+	// This file was produced using gnu tar 1.17
+	// gnutar  -b 4 --format=ustar (longname/)*15 + file.txt
+	{
+		file: "testdata/ustar.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     strings.Repeat("longname/", 15) + "file.txt",
+					Mode:     0644,
+					Uid:      0765,
+					Gid:      024,
+					Size:     06,
+					ModTime:  time.Unix(1360135598, 0),
+					Typeflag: '0',
+					Uname:    "shane",
+					Gname:    "staff",
+				},
+				contents: "hello\n",
+			},
+		},
+	},
+	// This file was produced using gnu tar 1.26
+	// echo "Slartibartfast" > file.txt
+	// ln file.txt hard.txt
+	// tar -b 1 --format=ustar -c -f hardlink.tar file.txt hard.txt
+	{
+		file: "testdata/hardlink.tar",
+		entries: []*writerTestEntry{
+			{
+				header: &Header{
+					Name:     "file.txt",
+					Mode:     0644,
+					Uid:      1000,
+					Gid:      100,
+					Size:     15,
+					ModTime:  time.Unix(1425484303, 0),
+					Typeflag: '0',
+					Uname:    "vbatts",
+					Gname:    "users",
+				},
+				contents: "Slartibartfast\n",
+			},
+			{
+				header: &Header{
+					Name:     "hard.txt",
+					Mode:     0644,
+					Uid:      1000,
+					Gid:      100,
+					Size:     0,
+					ModTime:  time.Unix(1425484303, 0),
+					Typeflag: '1',
+					Linkname: "file.txt",
+					Uname:    "vbatts",
+					Gname:    "users",
+				},
+				// no contents
+			},
+		},
+	},
+}
+
+// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection.
+func bytestr(offset int, b []byte) string {
+	const rowLen = 32
+	s := fmt.Sprintf("%04x ", offset)
+	for _, ch := range b {
+		switch {
+		case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z':
+			s += fmt.Sprintf("  %c", ch)
+		default:
+			s += fmt.Sprintf(" %02x", ch)
+		}
+	}
+	return s
+}
+
+// Render a pseudo-diff between two blocks of bytes.
+func bytediff(a []byte, b []byte) string {
+	const rowLen = 32
+	s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b))
+	for offset := 0; len(a)+len(b) > 0; offset += rowLen {
+		na, nb := rowLen, rowLen
+		if na > len(a) {
+			na = len(a)
+		}
+		if nb > len(b) {
+			nb = len(b)
+		}
+		sa := bytestr(offset, a[0:na])
+		sb := bytestr(offset, b[0:nb])
+		if sa != sb {
+			s += fmt.Sprintf("-%v\n+%v\n", sa, sb)
+		}
+		a = a[na:]
+		b = b[nb:]
+	}
+	return s
+}
+
+func TestWriter(t *testing.T) {
+testLoop:
+	for i, test := range writerTests {
+		expected, err := ioutil.ReadFile(test.file)
+		if err != nil {
+			t.Errorf("test %d: Unexpected error: %v", i, err)
+			continue
+		}
+
+		buf := new(bytes.Buffer)
+		tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB
+		big := false
+		for j, entry := range test.entries {
+			big = big || entry.header.Size > 1<<10
+			if err := tw.WriteHeader(entry.header); err != nil {
+				t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err)
+				continue testLoop
+			}
+			if _, err := io.WriteString(tw, entry.contents); err != nil {
+				t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err)
+				continue testLoop
+			}
+		}
+		// Only interested in Close failures for the small tests.
+		if err := tw.Close(); err != nil && !big {
+			t.Errorf("test %d: Failed closing archive: %v", i, err)
+			continue testLoop
+		}
+
+		actual := buf.Bytes()
+		if !bytes.Equal(expected, actual) {
+			t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v",
+				i, bytediff(expected, actual))
+		}
+		if testing.Short() { // The second test is expensive.
+			break
+		}
+	}
+}
+
+func TestPax(t *testing.T) {
+	// Create an archive with a large name
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat: %v", err)
+	}
+	// Force a PAX long name to be written
+	longName := strings.Repeat("ab", 100)
+	contents := strings.Repeat(" ", int(hdr.Size))
+	hdr.Name = longName
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Name != longName {
+		t.Fatal("Couldn't recover long file name")
+	}
+}
+
+func TestPaxSymlink(t *testing.T) {
+	// Create an archive with a large linkname
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	hdr.Typeflag = TypeSymlink
+	if err != nil {
+		t.Fatalf("os.Stat:1 %v", err)
+	}
+	// Force a PAX long linkname to be written
+	longLinkname := strings.Repeat("1234567890/1234567890", 10)
+	hdr.Linkname = longLinkname
+
+	hdr.Size = 0
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Linkname != longLinkname {
+		t.Fatal("Couldn't recover long link name")
+	}
+}
+
+func TestPaxNonAscii(t *testing.T) {
+	// Create an archive with non ascii. These should trigger a pax header
+	// because pax headers have a defined utf-8 encoding.
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat:1 %v", err)
+	}
+
+	// some sample data
+	chineseFilename := "文件名"
+	chineseGroupname := "組"
+	chineseUsername := "用戶名"
+
+	hdr.Name = chineseFilename
+	hdr.Gname = chineseGroupname
+	hdr.Uname = chineseUsername
+
+	contents := strings.Repeat(" ", int(hdr.Size))
+
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Name != chineseFilename {
+		t.Fatal("Couldn't recover unicode name")
+	}
+	if hdr.Gname != chineseGroupname {
+		t.Fatal("Couldn't recover unicode group")
+	}
+	if hdr.Uname != chineseUsername {
+		t.Fatal("Couldn't recover unicode user")
+	}
+}
+
+func TestPaxXattrs(t *testing.T) {
+	xattrs := map[string]string{
+		"user.key": "value",
+	}
+
+	// Create an archive with an xattr
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat: %v", err)
+	}
+	contents := "Kilts"
+	hdr.Xattrs = xattrs
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Test that we can get the xattrs back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(hdr.Xattrs, xattrs) {
+		t.Fatalf("xattrs did not survive round trip: got %+v, want %+v",
+			hdr.Xattrs, xattrs)
+	}
+}
+
+func TestPaxHeadersSorted(t *testing.T) {
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	if err != nil {
+		t.Fatalf("os.Stat: %v", err)
+	}
+	contents := strings.Repeat(" ", int(hdr.Size))
+
+	hdr.Xattrs = map[string]string{
+		"foo": "foo",
+		"bar": "bar",
+		"baz": "baz",
+		"qux": "qux",
+	}
+
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if _, err = writer.Write([]byte(contents)); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Simple test to make sure PAX extensions are in effect
+	if !bytes.Contains(buf.Bytes(), []byte("PaxHeaders.0")) {
+		t.Fatal("Expected at least one PAX header to be written.")
+	}
+
+	// xattr bar should always appear before others
+	indices := []int{
+		bytes.Index(buf.Bytes(), []byte("bar=bar")),
+		bytes.Index(buf.Bytes(), []byte("baz=baz")),
+		bytes.Index(buf.Bytes(), []byte("foo=foo")),
+		bytes.Index(buf.Bytes(), []byte("qux=qux")),
+	}
+	if !sort.IntsAreSorted(indices) {
+		t.Fatal("PAX headers are not sorted")
+	}
+}
+
+func TestUSTARLongName(t *testing.T) {
+	// Create an archive with a path that failed to split with USTAR extension in previous versions.
+	fileinfo, err := os.Stat("testdata/small.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	hdr, err := FileInfoHeader(fileinfo, "")
+	hdr.Typeflag = TypeDir
+	if err != nil {
+		t.Fatalf("os.Stat:1 %v", err)
+	}
+	// Force a PAX long name to be written. The name was taken from a practical example
+	// that fails and replaced ever char through numbers to anonymize the sample.
+	longName := "/0000_0000000/00000-000000000/0000_0000000/00000-0000000000000/0000_0000000/00000-0000000-00000000/0000_0000000/00000000/0000_0000000/000/0000_0000000/00000000v00/0000_0000000/000000/0000_0000000/0000000/0000_0000000/00000y-00/0000/0000/00000000/0x000000/"
+	hdr.Name = longName
+
+	hdr.Size = 0
+	var buf bytes.Buffer
+	writer := NewWriter(&buf)
+	if err := writer.WriteHeader(hdr); err != nil {
+		t.Fatal(err)
+	}
+	if err := writer.Close(); err != nil {
+		t.Fatal(err)
+	}
+	// Test that we can get a long name back out of the archive.
+	reader := NewReader(&buf)
+	hdr, err = reader.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if hdr.Name != longName {
+		t.Fatal("Couldn't recover long name")
+	}
+}
+
+func TestValidTypeflagWithPAXHeader(t *testing.T) {
+	var buffer bytes.Buffer
+	tw := NewWriter(&buffer)
+
+	fileName := strings.Repeat("ab", 100)
+
+	hdr := &Header{
+		Name:     fileName,
+		Size:     4,
+		Typeflag: 0,
+	}
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("Failed to write header: %s", err)
+	}
+	if _, err := tw.Write([]byte("fooo")); err != nil {
+		t.Fatalf("Failed to write the file's data: %s", err)
+	}
+	tw.Close()
+
+	tr := NewReader(&buffer)
+
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatalf("Failed to read header: %s", err)
+		}
+		if header.Typeflag != 0 {
+			t.Fatalf("Typeflag should've been 0, found %d", header.Typeflag)
+		}
+	}
+}
+
+func TestWriteAfterClose(t *testing.T) {
+	var buffer bytes.Buffer
+	tw := NewWriter(&buffer)
+
+	hdr := &Header{
+		Name: "small.txt",
+		Size: 5,
+	}
+	if err := tw.WriteHeader(hdr); err != nil {
+		t.Fatalf("Failed to write header: %s", err)
+	}
+	tw.Close()
+	if _, err := tw.Write([]byte("Kilts")); err != ErrWriteAfterClose {
+		t.Fatalf("Write: got %v; want ErrWriteAfterClose", err)
+	}
+}
+
+func TestSplitUSTARPath(t *testing.T) {
+	var sr = strings.Repeat
+
+	var vectors = []struct {
+		input  string // Input path
+		prefix string // Expected output prefix
+		suffix string // Expected output suffix
+		ok     bool   // Split success?
+	}{
+		{"", "", "", false},
+		{"abc", "", "", false},
+		{"用戶名", "", "", false},
+		{sr("a", fileNameSize), "", "", false},
+		{sr("a", fileNameSize) + "/", "", "", false},
+		{sr("a", fileNameSize) + "/a", sr("a", fileNameSize), "a", true},
+		{sr("a", fileNamePrefixSize) + "/", "", "", false},
+		{sr("a", fileNamePrefixSize) + "/a", sr("a", fileNamePrefixSize), "a", true},
+		{sr("a", fileNameSize+1), "", "", false},
+		{sr("/", fileNameSize+1), sr("/", fileNameSize-1), "/", true},
+		{sr("a", fileNamePrefixSize) + "/" + sr("b", fileNameSize),
+			sr("a", fileNamePrefixSize), sr("b", fileNameSize), true},
+		{sr("a", fileNamePrefixSize) + "//" + sr("b", fileNameSize), "", "", false},
+		{sr("a/", fileNameSize), sr("a/", 77) + "a", sr("a/", 22), true},
+	}
+
+	for _, v := range vectors {
+		prefix, suffix, ok := splitUSTARPath(v.input)
+		if prefix != v.prefix || suffix != v.suffix || ok != v.ok {
+			t.Errorf("splitUSTARPath(%q):\ngot  (%q, %q, %v)\nwant (%q, %q, %v)",
+				v.input, prefix, suffix, ok, v.prefix, v.suffix, v.ok)
+		}
+	}
+}
+
+func TestFormatPAXRecord(t *testing.T) {
+	var medName = strings.Repeat("CD", 50)
+	var longName = strings.Repeat("AB", 100)
+
+	var vectors = []struct {
+		inputKey string
+		inputVal string
+		output   string
+	}{
+		{"k", "v", "6 k=v\n"},
+		{"path", "/etc/hosts", "19 path=/etc/hosts\n"},
+		{"path", longName, "210 path=" + longName + "\n"},
+		{"path", medName, "110 path=" + medName + "\n"},
+		{"foo", "ba", "9 foo=ba\n"},
+		{"foo", "bar", "11 foo=bar\n"},
+		{"foo", "b=\nar=\n==\x00", "18 foo=b=\nar=\n==\x00\n"},
+		{"foo", "hello9 foo=ba\nworld", "27 foo=hello9 foo=ba\nworld\n"},
+		{"☺☻☹", "日a本b語ç", "27 ☺☻☹=日a本b語ç\n"},
+		{"\x00hello", "\x00world", "17 \x00hello=\x00world\n"},
+	}
+
+	for _, v := range vectors {
+		output := formatPAXRecord(v.inputKey, v.inputVal)
+		if output != v.output {
+			t.Errorf("formatPAXRecord(%q, %q): got %q, want %q",
+				v.inputKey, v.inputVal, output, v.output)
+		}
+	}
+}
+
+func TestFitsInBase256(t *testing.T) {
+	var vectors = []struct {
+		input int64
+		width int
+		ok    bool
+	}{
+		{+1, 8, true},
+		{0, 8, true},
+		{-1, 8, true},
+		{1 << 56, 8, false},
+		{(1 << 56) - 1, 8, true},
+		{-1 << 56, 8, true},
+		{(-1 << 56) - 1, 8, false},
+		{121654, 8, true},
+		{-9849849, 8, true},
+		{math.MaxInt64, 9, true},
+		{0, 9, true},
+		{math.MinInt64, 9, true},
+		{math.MaxInt64, 12, true},
+		{0, 12, true},
+		{math.MinInt64, 12, true},
+	}
+
+	for _, v := range vectors {
+		ok := fitsInBase256(v.width, v.input)
+		if ok != v.ok {
+			t.Errorf("checkNumeric(%d, %d): got %v, want %v", v.input, v.width, ok, v.ok)
+		}
+	}
+}
+
+func TestFormatNumeric(t *testing.T) {
+	var vectors = []struct {
+		input  int64
+		output string
+		ok     bool
+	}{
+		// Test base-256 (binary) encoded values.
+		{-1, "\xff", true},
+		{-1, "\xff\xff", true},
+		{-1, "\xff\xff\xff", true},
+		{(1 << 0), "0", false},
+		{(1 << 8) - 1, "\x80\xff", true},
+		{(1 << 8), "0\x00", false},
+		{(1 << 16) - 1, "\x80\xff\xff", true},
+		{(1 << 16), "00\x00", false},
+		{-1 * (1 << 0), "\xff", true},
+		{-1*(1<<0) - 1, "0", false},
+		{-1 * (1 << 8), "\xff\x00", true},
+		{-1*(1<<8) - 1, "0\x00", false},
+		{-1 * (1 << 16), "\xff\x00\x00", true},
+		{-1*(1<<16) - 1, "00\x00", false},
+		{537795476381659745, "0000000\x00", false},
+		{537795476381659745, "\x80\x00\x00\x00\x07\x76\xa2\x22\xeb\x8a\x72\x61", true},
+		{-615126028225187231, "0000000\x00", false},
+		{-615126028225187231, "\xff\xff\xff\xff\xf7\x76\xa2\x22\xeb\x8a\x72\x61", true},
+		{math.MaxInt64, "0000000\x00", false},
+		{math.MaxInt64, "\x80\x00\x00\x00\x7f\xff\xff\xff\xff\xff\xff\xff", true},
+		{math.MinInt64, "0000000\x00", false},
+		{math.MinInt64, "\xff\xff\xff\xff\x80\x00\x00\x00\x00\x00\x00\x00", true},
+		{math.MaxInt64, "\x80\x7f\xff\xff\xff\xff\xff\xff\xff", true},
+		{math.MinInt64, "\xff\x80\x00\x00\x00\x00\x00\x00\x00", true},
+	}
+
+	for _, v := range vectors {
+		var f formatter
+		output := make([]byte, len(v.output))
+		f.formatNumeric(output, v.input)
+		ok := (f.err == nil)
+		if ok != v.ok {
+			if v.ok {
+				t.Errorf("formatNumeric(%d): got formatting failure, want success", v.input)
+			} else {
+				t.Errorf("formatNumeric(%d): got formatting success, want failure", v.input)
+			}
+		}
+		if string(output) != v.output {
+			t.Errorf("formatNumeric(%d): got %q, want %q", v.input, output, v.output)
+		}
+	}
+}
+
+func TestFormatPAXTime(t *testing.T) {
+	t1 := time.Date(2000, 1, 1, 11, 0, 0, 0, time.UTC)
+	t2 := time.Date(2000, 1, 1, 11, 0, 0, 100, time.UTC)
+	t3 := time.Date(1960, 1, 1, 11, 0, 0, 0, time.UTC)
+	t4 := time.Date(1970, 1, 1, 0, 0, 0, 0, time.UTC)
+	verify := func(time time.Time, s string) {
+		p := formatPAXTime(time)
+		if p != s {
+			t.Errorf("for %v, expected %s, got %s", time, s, p)
+		}
+	}
+	verify(t1, "946724400")
+	verify(t2, "946724400.000000100")
+	verify(t3, "-315579600")
+	verify(t4, "0")
+}

vendor/github.com/Microsoft/go-winio/backuptar/noop.go

@@ -0,0 +1,4 @@
+// +build !windows
+// This file only exists to allow go get on non-Windows platforms.
+
+package backuptar

vendor/github.com/Microsoft/go-winio/backuptar/tar.go

@@ -0,0 +1,439 @@
+// +build windows
+
+package backuptar
+
+import (
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/Microsoft/go-winio/archive/tar" // until archive/tar supports pax extensions in its interface
+)
+
+const (
+	c_ISUID  = 04000   // Set uid
+	c_ISGID  = 02000   // Set gid
+	c_ISVTX  = 01000   // Save text (sticky bit)
+	c_ISDIR  = 040000  // Directory
+	c_ISFIFO = 010000  // FIFO
+	c_ISREG  = 0100000 // Regular file
+	c_ISLNK  = 0120000 // Symbolic link
+	c_ISBLK  = 060000  // Block special file
+	c_ISCHR  = 020000  // Character special file
+	c_ISSOCK = 0140000 // Socket
+)
+
+const (
+	hdrFileAttributes        = "fileattr"
+	hdrSecurityDescriptor    = "sd"
+	hdrRawSecurityDescriptor = "rawsd"
+	hdrMountPoint            = "mountpoint"
+	hdrEaPrefix              = "xattr."
+)
+
+func writeZeroes(w io.Writer, count int64) error {
+	buf := make([]byte, 8192)
+	c := len(buf)
+	for i := int64(0); i < count; i += int64(c) {
+		if int64(c) > count-i {
+			c = int(count - i)
+		}
+		_, err := w.Write(buf[:c])
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func copySparse(t *tar.Writer, br *winio.BackupStreamReader) error {
+	curOffset := int64(0)
+	for {
+		bhdr, err := br.Next()
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		if err != nil {
+			return err
+		}
+		if bhdr.Id != winio.BackupSparseBlock {
+			return fmt.Errorf("unexpected stream %d", bhdr.Id)
+		}
+
+		// archive/tar does not support writing sparse files
+		// so just write zeroes to catch up to the current offset.
+		err = writeZeroes(t, bhdr.Offset-curOffset)
+		if bhdr.Size == 0 {
+			break
+		}
+		n, err := io.Copy(t, br)
+		if err != nil {
+			return err
+		}
+		curOffset = bhdr.Offset + n
+	}
+	return nil
+}
+
+// BasicInfoHeader creates a tar header from basic file information.
+func BasicInfoHeader(name string, size int64, fileInfo *winio.FileBasicInfo) *tar.Header {
+	hdr := &tar.Header{
+		Name:         filepath.ToSlash(name),
+		Size:         size,
+		Typeflag:     tar.TypeReg,
+		ModTime:      time.Unix(0, fileInfo.LastWriteTime.Nanoseconds()),
+		ChangeTime:   time.Unix(0, fileInfo.ChangeTime.Nanoseconds()),
+		AccessTime:   time.Unix(0, fileInfo.LastAccessTime.Nanoseconds()),
+		CreationTime: time.Unix(0, fileInfo.CreationTime.Nanoseconds()),
+		Winheaders:   make(map[string]string),
+	}
+	hdr.Winheaders[hdrFileAttributes] = fmt.Sprintf("%d", fileInfo.FileAttributes)
+
+	if (fileInfo.FileAttributes & syscall.FILE_ATTRIBUTE_DIRECTORY) != 0 {
+		hdr.Mode |= c_ISDIR
+		hdr.Size = 0
+		hdr.Typeflag = tar.TypeDir
+	}
+	return hdr
+}
+
+// WriteTarFileFromBackupStream writes a file to a tar writer using data from a Win32 backup stream.
+//
+// This encodes Win32 metadata as tar pax vendor extensions starting with MSWINDOWS.
+//
+// The additional Win32 metadata is:
+//
+// MSWINDOWS.fileattr: The Win32 file attributes, as a decimal value
+//
+// MSWINDOWS.rawsd: The Win32 security descriptor, in raw binary format
+//
+// MSWINDOWS.mountpoint: If present, this is a mount point and not a symlink, even though the type is '2' (symlink)
+func WriteTarFileFromBackupStream(t *tar.Writer, r io.Reader, name string, size int64, fileInfo *winio.FileBasicInfo) error {
+	name = filepath.ToSlash(name)
+	hdr := BasicInfoHeader(name, size, fileInfo)
+
+	// If r can be seeked, then this function is two-pass: pass 1 collects the
+	// tar header data, and pass 2 copies the data stream. If r cannot be
+	// seeked, then some header data (in particular EAs) will be silently lost.
+	var (
+		restartPos int64
+		err        error
+	)
+	sr, readTwice := r.(io.Seeker)
+	if readTwice {
+		if restartPos, err = sr.Seek(0, io.SeekCurrent); err != nil {
+			readTwice = false
+		}
+	}
+
+	br := winio.NewBackupStreamReader(r)
+	var dataHdr *winio.BackupHeader
+	for dataHdr == nil {
+		bhdr, err := br.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		switch bhdr.Id {
+		case winio.BackupData:
+			hdr.Mode |= c_ISREG
+			if !readTwice {
+				dataHdr = bhdr
+			}
+		case winio.BackupSecurity:
+			sd, err := ioutil.ReadAll(br)
+			if err != nil {
+				return err
+			}
+			hdr.Winheaders[hdrRawSecurityDescriptor] = base64.StdEncoding.EncodeToString(sd)
+
+		case winio.BackupReparseData:
+			hdr.Mode |= c_ISLNK
+			hdr.Typeflag = tar.TypeSymlink
+			reparseBuffer, err := ioutil.ReadAll(br)
+			rp, err := winio.DecodeReparsePoint(reparseBuffer)
+			if err != nil {
+				return err
+			}
+			if rp.IsMountPoint {
+				hdr.Winheaders[hdrMountPoint] = "1"
+			}
+			hdr.Linkname = rp.Target
+
+		case winio.BackupEaData:
+			eab, err := ioutil.ReadAll(br)
+			if err != nil {
+				return err
+			}
+			eas, err := winio.DecodeExtendedAttributes(eab)
+			if err != nil {
+				return err
+			}
+			for _, ea := range eas {
+				// Use base64 encoding for the binary value. Note that there
+				// is no way to encode the EA's flags, since their use doesn't
+				// make any sense for persisted EAs.
+				hdr.Winheaders[hdrEaPrefix+ea.Name] = base64.StdEncoding.EncodeToString(ea.Value)
+			}
+
+		case winio.BackupAlternateData, winio.BackupLink, winio.BackupPropertyData, winio.BackupObjectId, winio.BackupTxfsData:
+			// ignore these streams
+		default:
+			return fmt.Errorf("%s: unknown stream ID %d", name, bhdr.Id)
+		}
+	}
+
+	err = t.WriteHeader(hdr)
+	if err != nil {
+		return err
+	}
+
+	if readTwice {
+		// Get back to the data stream.
+		if _, err = sr.Seek(restartPos, io.SeekStart); err != nil {
+			return err
+		}
+		for dataHdr == nil {
+			bhdr, err := br.Next()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return err
+			}
+			if bhdr.Id == winio.BackupData {
+				dataHdr = bhdr
+			}
+		}
+	}
+
+	if dataHdr != nil {
+		// A data stream was found. Copy the data.
+		if (dataHdr.Attributes & winio.StreamSparseAttributes) == 0 {
+			if size != dataHdr.Size {
+				return fmt.Errorf("%s: mismatch between file size %d and header size %d", name, size, dataHdr.Size)
+			}
+			_, err = io.Copy(t, br)
+			if err != nil {
+				return err
+			}
+		} else {
+			err = copySparse(t, br)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	// Look for streams after the data stream. The only ones we handle are alternate data streams.
+	// Other streams may have metadata that could be serialized, but the tar header has already
+	// been written. In practice, this means that we don't get EA or TXF metadata.
+	for {
+		bhdr, err := br.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return err
+		}
+		switch bhdr.Id {
+		case winio.BackupAlternateData:
+			altName := bhdr.Name
+			if strings.HasSuffix(altName, ":$DATA") {
+				altName = altName[:len(altName)-len(":$DATA")]
+			}
+			if (bhdr.Attributes & winio.StreamSparseAttributes) == 0 {
+				hdr = &tar.Header{
+					Name:       name + altName,
+					Mode:       hdr.Mode,
+					Typeflag:   tar.TypeReg,
+					Size:       bhdr.Size,
+					ModTime:    hdr.ModTime,
+					AccessTime: hdr.AccessTime,
+					ChangeTime: hdr.ChangeTime,
+				}
+				err = t.WriteHeader(hdr)
+				if err != nil {
+					return err
+				}
+				_, err = io.Copy(t, br)
+				if err != nil {
+					return err
+				}
+
+			} else {
+				// Unsupported for now, since the size of the alternate stream is not present
+				// in the backup stream until after the data has been read.
+				return errors.New("tar of sparse alternate data streams is unsupported")
+			}
+		case winio.BackupEaData, winio.BackupLink, winio.BackupPropertyData, winio.BackupObjectId, winio.BackupTxfsData:
+			// ignore these streams
+		default:
+			return fmt.Errorf("%s: unknown stream ID %d after data", name, bhdr.Id)
+		}
+	}
+	return nil
+}
+
+// FileInfoFromHeader retrieves basic Win32 file information from a tar header, using the additional metadata written by
+// WriteTarFileFromBackupStream.
+func FileInfoFromHeader(hdr *tar.Header) (name string, size int64, fileInfo *winio.FileBasicInfo, err error) {
+	name = hdr.Name
+	if hdr.Typeflag == tar.TypeReg || hdr.Typeflag == tar.TypeRegA {
+		size = hdr.Size
+	}
+	fileInfo = &winio.FileBasicInfo{
+		LastAccessTime: syscall.NsecToFiletime(hdr.AccessTime.UnixNano()),
+		LastWriteTime:  syscall.NsecToFiletime(hdr.ModTime.UnixNano()),
+		ChangeTime:     syscall.NsecToFiletime(hdr.ChangeTime.UnixNano()),
+		CreationTime:   syscall.NsecToFiletime(hdr.CreationTime.UnixNano()),
+	}
+	if attrStr, ok := hdr.Winheaders[hdrFileAttributes]; ok {
+		attr, err := strconv.ParseUint(attrStr, 10, 32)
+		if err != nil {
+			return "", 0, nil, err
+		}
+		fileInfo.FileAttributes = uintptr(attr)
+	} else {
+		if hdr.Typeflag == tar.TypeDir {
+			fileInfo.FileAttributes |= syscall.FILE_ATTRIBUTE_DIRECTORY
+		}
+	}
+	return
+}
+
+// WriteBackupStreamFromTarFile writes a Win32 backup stream from the current tar file. Since this function may process multiple
+// tar file entries in order to collect all the alternate data streams for the file, it returns the next
+// tar file that was not processed, or io.EOF is there are no more.
+func WriteBackupStreamFromTarFile(w io.Writer, t *tar.Reader, hdr *tar.Header) (*tar.Header, error) {
+	bw := winio.NewBackupStreamWriter(w)
+	var sd []byte
+	var err error
+	// Maintaining old SDDL-based behavior for backward compatibility.  All new tar headers written
+	// by this library will have raw binary for the security descriptor.
+	if sddl, ok := hdr.Winheaders[hdrSecurityDescriptor]; ok {
+		sd, err = winio.SddlToSecurityDescriptor(sddl)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if sdraw, ok := hdr.Winheaders[hdrRawSecurityDescriptor]; ok {
+		sd, err = base64.StdEncoding.DecodeString(sdraw)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if len(sd) != 0 {
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupSecurity,
+			Size: int64(len(sd)),
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(sd)
+		if err != nil {
+			return nil, err
+		}
+	}
+	var eas []winio.ExtendedAttribute
+	for k, v := range hdr.Winheaders {
+		if !strings.HasPrefix(k, hdrEaPrefix) {
+			continue
+		}
+		data, err := base64.StdEncoding.DecodeString(v)
+		if err != nil {
+			return nil, err
+		}
+		eas = append(eas, winio.ExtendedAttribute{
+			Name:  k[len(hdrEaPrefix):],
+			Value: data,
+		})
+	}
+	if len(eas) != 0 {
+		eadata, err := winio.EncodeExtendedAttributes(eas)
+		if err != nil {
+			return nil, err
+		}
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupEaData,
+			Size: int64(len(eadata)),
+		}
+		err = bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(eadata)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if hdr.Typeflag == tar.TypeSymlink {
+		_, isMountPoint := hdr.Winheaders[hdrMountPoint]
+		rp := winio.ReparsePoint{
+			Target:       filepath.FromSlash(hdr.Linkname),
+			IsMountPoint: isMountPoint,
+		}
+		reparse := winio.EncodeReparsePoint(&rp)
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupReparseData,
+			Size: int64(len(reparse)),
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(reparse)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if hdr.Typeflag == tar.TypeReg || hdr.Typeflag == tar.TypeRegA {
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupData,
+			Size: hdr.Size,
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.Copy(bw, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+	// Copy all the alternate data streams and return the next non-ADS header.
+	for {
+		ahdr, err := t.Next()
+		if err != nil {
+			return nil, err
+		}
+		if ahdr.Typeflag != tar.TypeReg || !strings.HasPrefix(ahdr.Name, hdr.Name+":") {
+			return ahdr, nil
+		}
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupAlternateData,
+			Size: ahdr.Size,
+			Name: ahdr.Name[len(hdr.Name):] + ":$DATA",
+		}
+		err = bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.Copy(bw, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+}

vendor/github.com/Microsoft/go-winio/backuptar/tar_test.go

@@ -0,0 +1,84 @@
+package backuptar
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"reflect"
+	"testing"
+
+	"github.com/Microsoft/go-winio"
+	"github.com/Microsoft/go-winio/archive/tar"
+)
+
+func ensurePresent(t *testing.T, m map[string]string, keys ...string) {
+	for _, k := range keys {
+		if _, ok := m[k]; !ok {
+			t.Error(k, "not present in tar header")
+		}
+	}
+}
+
+func TestRoundTrip(t *testing.T) {
+	f, err := ioutil.TempFile("", "tst")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	defer os.Remove(f.Name())
+
+	if _, err = f.Write([]byte("testing 1 2 3\n")); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err = f.Seek(0, 0); err != nil {
+		t.Fatal(err)
+	}
+
+	fi, err := f.Stat()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	bi, err := winio.GetFileBasicInfo(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	br := winio.NewBackupFileReader(f, true)
+	defer br.Close()
+
+	var buf bytes.Buffer
+	tw := tar.NewWriter(&buf)
+
+	err = WriteTarFileFromBackupStream(tw, br, f.Name(), fi.Size(), bi)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tr := tar.NewReader(&buf)
+	hdr, err := tr.Next()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	name, size, bi2, err := FileInfoFromHeader(hdr)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if name != filepath.ToSlash(f.Name()) {
+		t.Errorf("got name %s, expected %s", name, filepath.ToSlash(f.Name()))
+	}
+
+	if size != fi.Size() {
+		t.Errorf("got size %d, expected %d", size, fi.Size())
+	}
+
+	if !reflect.DeepEqual(*bi, *bi2) {
+		t.Errorf("got %#v, expected %#v", *bi, *bi2)
+	}
+
+	ensurePresent(t, hdr.Winheaders, "fileattr", "rawsd")
+}

vendor/github.com/Microsoft/go-winio/vhd/mksyscall_windows.go

@@ -0,0 +1,901 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Hard-coding unicode mode for VHD library.
+
+// +build ignore
+
+/*
+mksyscall_windows generates windows system call bodies
+
+It parses all files specified on command line containing function
+prototypes (like syscall_windows.go) and prints system call bodies
+to standard output.
+
+The prototypes are marked by lines beginning with "//sys" and read
+like func declarations if //sys is replaced by func, but:
+
+* The parameter lists must give a name for each argument. This
+  includes return parameters.
+
+* The parameter lists must give a type for each argument:
+  the (x, y, z int) shorthand is not allowed.
+
+* If the return parameter is an error number, it must be named err.
+
+* If go func name needs to be different from it's winapi dll name,
+  the winapi name could be specified at the end, after "=" sign, like
+  //sys LoadLibrary(libname string) (handle uint32, err error) = LoadLibraryA
+
+* Each function that returns err needs to supply a condition, that
+  return value of winapi will be tested against to detect failure.
+  This would set err to windows "last-error", otherwise it will be nil.
+  The value can be provided at end of //sys declaration, like
+  //sys LoadLibrary(libname string) (handle uint32, err error) [failretval==-1] = LoadLibraryA
+  and is [failretval==0] by default.
+
+Usage:
+	mksyscall_windows [flags] [path ...]
+
+The flags are:
+	-output
+		Specify output file name (outputs to console if blank).
+	-trace
+		Generate print statement after every syscall.
+*/
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"flag"
+	"fmt"
+	"go/format"
+	"go/parser"
+	"go/token"
+	"io"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sort"
+	"strconv"
+	"strings"
+	"text/template"
+)
+
+var (
+	filename       = flag.String("output", "", "output file name (standard output if omitted)")
+	printTraceFlag = flag.Bool("trace", false, "generate print statement after every syscall")
+	systemDLL      = flag.Bool("systemdll", true, "whether all DLLs should be loaded from the Windows system directory")
+)
+
+func trim(s string) string {
+	return strings.Trim(s, " \t")
+}
+
+var packageName string
+
+func packagename() string {
+	return packageName
+}
+
+func syscalldot() string {
+	if packageName == "syscall" {
+		return ""
+	}
+	return "syscall."
+}
+
+// Param is function parameter
+type Param struct {
+	Name      string
+	Type      string
+	fn        *Fn
+	tmpVarIdx int
+}
+
+// tmpVar returns temp variable name that will be used to represent p during syscall.
+func (p *Param) tmpVar() string {
+	if p.tmpVarIdx < 0 {
+		p.tmpVarIdx = p.fn.curTmpVarIdx
+		p.fn.curTmpVarIdx++
+	}
+	return fmt.Sprintf("_p%d", p.tmpVarIdx)
+}
+
+// BoolTmpVarCode returns source code for bool temp variable.
+func (p *Param) BoolTmpVarCode() string {
+	const code = `var %s uint32
+	if %s {
+		%s = 1
+	} else {
+		%s = 0
+	}`
+	tmp := p.tmpVar()
+	return fmt.Sprintf(code, tmp, p.Name, tmp, tmp)
+}
+
+// SliceTmpVarCode returns source code for slice temp variable.
+func (p *Param) SliceTmpVarCode() string {
+	const code = `var %s *%s
+	if len(%s) > 0 {
+		%s = &%s[0]
+	}`
+	tmp := p.tmpVar()
+	return fmt.Sprintf(code, tmp, p.Type[2:], p.Name, tmp, p.Name)
+}
+
+// StringTmpVarCode returns source code for string temp variable.
+func (p *Param) StringTmpVarCode() string {
+	errvar := p.fn.Rets.ErrorVarName()
+	if errvar == "" {
+		errvar = "_"
+	}
+	tmp := p.tmpVar()
+	const code = `var %s %s
+	%s, %s = %s(%s)`
+	s := fmt.Sprintf(code, tmp, p.fn.StrconvType(), tmp, errvar, p.fn.StrconvFunc(), p.Name)
+	if errvar == "-" {
+		return s
+	}
+	const morecode = `
+	if %s != nil {
+		return
+	}`
+	return s + fmt.Sprintf(morecode, errvar)
+}
+
+// TmpVarCode returns source code for temp variable.
+func (p *Param) TmpVarCode() string {
+	switch {
+	case p.Type == "bool":
+		return p.BoolTmpVarCode()
+	case strings.HasPrefix(p.Type, "[]"):
+		return p.SliceTmpVarCode()
+	default:
+		return ""
+	}
+}
+
+// TmpVarHelperCode returns source code for helper's temp variable.
+func (p *Param) TmpVarHelperCode() string {
+	if p.Type != "string" {
+		return ""
+	}
+	return p.StringTmpVarCode()
+}
+
+// SyscallArgList returns source code fragments representing p parameter
+// in syscall. Slices are translated into 2 syscall parameters: pointer to
+// the first element and length.
+func (p *Param) SyscallArgList() []string {
+	t := p.HelperType()
+	var s string
+	switch {
+	case t[0] == '*':
+		s = fmt.Sprintf("unsafe.Pointer(%s)", p.Name)
+	case t == "bool":
+		s = p.tmpVar()
+	case strings.HasPrefix(t, "[]"):
+		return []string{
+			fmt.Sprintf("uintptr(unsafe.Pointer(%s))", p.tmpVar()),
+			fmt.Sprintf("uintptr(len(%s))", p.Name),
+		}
+	default:
+		s = p.Name
+	}
+	return []string{fmt.Sprintf("uintptr(%s)", s)}
+}
+
+// IsError determines if p parameter is used to return error.
+func (p *Param) IsError() bool {
+	return p.Name == "err" && p.Type == "error"
+}
+
+// HelperType returns type of parameter p used in helper function.
+func (p *Param) HelperType() string {
+	if p.Type == "string" {
+		return p.fn.StrconvType()
+	}
+	return p.Type
+}
+
+// join concatenates parameters ps into a string with sep separator.
+// Each parameter is converted into string by applying fn to it
+// before conversion.
+func join(ps []*Param, fn func(*Param) string, sep string) string {
+	if len(ps) == 0 {
+		return ""
+	}
+	a := make([]string, 0)
+	for _, p := range ps {
+		a = append(a, fn(p))
+	}
+	return strings.Join(a, sep)
+}
+
+// Rets describes function return parameters.
+type Rets struct {
+	Name         string
+	Type         string
+	ReturnsError bool
+	FailCond     string
+}
+
+// ErrorVarName returns error variable name for r.
+func (r *Rets) ErrorVarName() string {
+	if r.ReturnsError {
+		return "err"
+	}
+	if r.Type == "error" {
+		return r.Name
+	}
+	return ""
+}
+
+// ToParams converts r into slice of *Param.
+func (r *Rets) ToParams() []*Param {
+	ps := make([]*Param, 0)
+	if len(r.Name) > 0 {
+		ps = append(ps, &Param{Name: r.Name, Type: r.Type})
+	}
+	if r.ReturnsError {
+		ps = append(ps, &Param{Name: "err", Type: "error"})
+	}
+	return ps
+}
+
+// List returns source code of syscall return parameters.
+func (r *Rets) List() string {
+	s := join(r.ToParams(), func(p *Param) string { return p.Name + " " + p.Type }, ", ")
+	if len(s) > 0 {
+		s = "(" + s + ")"
+	}
+	return s
+}
+
+// PrintList returns source code of trace printing part correspondent
+// to syscall return values.
+func (r *Rets) PrintList() string {
+	return join(r.ToParams(), func(p *Param) string { return fmt.Sprintf(`"%s=", %s, `, p.Name, p.Name) }, `", ", `)
+}
+
+// SetReturnValuesCode returns source code that accepts syscall return values.
+func (r *Rets) SetReturnValuesCode() string {
+	if r.Name == "" && !r.ReturnsError {
+		return ""
+	}
+	retvar := "r0"
+	if r.Name == "" {
+		retvar = "r1"
+	}
+	errvar := "_"
+	if r.ReturnsError {
+		errvar = "e1"
+	}
+	return fmt.Sprintf("%s, _, %s := ", retvar, errvar)
+}
+
+func (r *Rets) useLongHandleErrorCode(retvar string) string {
+	const code = `if %s {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = %sEINVAL
+		}
+	}`
+	cond := retvar + " == 0"
+	if r.FailCond != "" {
+		cond = strings.Replace(r.FailCond, "failretval", retvar, 1)
+	}
+	return fmt.Sprintf(code, cond, syscalldot())
+}
+
+// SetErrorCode returns source code that sets return parameters.
+func (r *Rets) SetErrorCode() string {
+	const code = `if r0 != 0 {
+		%s = %sErrno(r0)
+	}`
+	if r.Name == "" && !r.ReturnsError {
+		return ""
+	}
+	if r.Name == "" {
+		return r.useLongHandleErrorCode("r1")
+	}
+	if r.Type == "error" {
+		return fmt.Sprintf(code, r.Name, syscalldot())
+	}
+	s := ""
+	switch {
+	case r.Type[0] == '*':
+		s = fmt.Sprintf("%s = (%s)(unsafe.Pointer(r0))", r.Name, r.Type)
+	case r.Type == "bool":
+		s = fmt.Sprintf("%s = r0 != 0", r.Name)
+	default:
+		s = fmt.Sprintf("%s = %s(r0)", r.Name, r.Type)
+	}
+	if !r.ReturnsError {
+		return s
+	}
+	return s + "\n\t" + r.useLongHandleErrorCode(r.Name)
+}
+
+// Fn describes syscall function.
+type Fn struct {
+	Name        string
+	Params      []*Param
+	Rets        *Rets
+	PrintTrace  bool
+	dllname     string
+	dllfuncname string
+	src         string
+	// TODO: get rid of this field and just use parameter index instead
+	curTmpVarIdx int // insure tmp variables have uniq names
+}
+
+// extractParams parses s to extract function parameters.
+func extractParams(s string, f *Fn) ([]*Param, error) {
+	s = trim(s)
+	if s == "" {
+		return nil, nil
+	}
+	a := strings.Split(s, ",")
+	ps := make([]*Param, len(a))
+	for i := range ps {
+		s2 := trim(a[i])
+		b := strings.Split(s2, " ")
+		if len(b) != 2 {
+			b = strings.Split(s2, "\t")
+			if len(b) != 2 {
+				return nil, errors.New("Could not extract function parameter from \"" + s2 + "\"")
+			}
+		}
+		ps[i] = &Param{
+			Name:      trim(b[0]),
+			Type:      trim(b[1]),
+			fn:        f,
+			tmpVarIdx: -1,
+		}
+	}
+	return ps, nil
+}
+
+// extractSection extracts text out of string s starting after start
+// and ending just before end. found return value will indicate success,
+// and prefix, body and suffix will contain correspondent parts of string s.
+func extractSection(s string, start, end rune) (prefix, body, suffix string, found bool) {
+	s = trim(s)
+	if strings.HasPrefix(s, string(start)) {
+		// no prefix
+		body = s[1:]
+	} else {
+		a := strings.SplitN(s, string(start), 2)
+		if len(a) != 2 {
+			return "", "", s, false
+		}
+		prefix = a[0]
+		body = a[1]
+	}
+	a := strings.SplitN(body, string(end), 2)
+	if len(a) != 2 {
+		return "", "", "", false
+	}
+	return prefix, a[0], a[1], true
+}
+
+// newFn parses string s and return created function Fn.
+func newFn(s string) (*Fn, error) {
+	s = trim(s)
+	f := &Fn{
+		Rets:       &Rets{},
+		src:        s,
+		PrintTrace: *printTraceFlag,
+	}
+	// function name and args
+	prefix, body, s, found := extractSection(s, '(', ')')
+	if !found || prefix == "" {
+		return nil, errors.New("Could not extract function name and parameters from \"" + f.src + "\"")
+	}
+	f.Name = prefix
+	var err error
+	f.Params, err = extractParams(body, f)
+	if err != nil {
+		return nil, err
+	}
+	// return values
+	_, body, s, found = extractSection(s, '(', ')')
+	if found {
+		r, err := extractParams(body, f)
+		if err != nil {
+			return nil, err
+		}
+		switch len(r) {
+		case 0:
+		case 1:
+			if r[0].IsError() {
+				f.Rets.ReturnsError = true
+			} else {
+				f.Rets.Name = r[0].Name
+				f.Rets.Type = r[0].Type
+			}
+		case 2:
+			if !r[1].IsError() {
+				return nil, errors.New("Only last windows error is allowed as second return value in \"" + f.src + "\"")
+			}
+			f.Rets.ReturnsError = true
+			f.Rets.Name = r[0].Name
+			f.Rets.Type = r[0].Type
+		default:
+			return nil, errors.New("Too many return values in \"" + f.src + "\"")
+		}
+	}
+	// fail condition
+	_, body, s, found = extractSection(s, '[', ']')
+	if found {
+		f.Rets.FailCond = body
+	}
+	// dll and dll function names
+	s = trim(s)
+	if s == "" {
+		return f, nil
+	}
+	if !strings.HasPrefix(s, "=") {
+		return nil, errors.New("Could not extract dll name from \"" + f.src + "\"")
+	}
+	s = trim(s[1:])
+	a := strings.Split(s, ".")
+	switch len(a) {
+	case 1:
+		f.dllfuncname = a[0]
+	case 2:
+		f.dllname = a[0]
+		f.dllfuncname = a[1]
+	default:
+		return nil, errors.New("Could not extract dll name from \"" + f.src + "\"")
+	}
+	return f, nil
+}
+
+// DLLName returns DLL name for function f.
+func (f *Fn) DLLName() string {
+	if f.dllname == "" {
+		return "kernel32"
+	}
+	return f.dllname
+}
+
+// DLLName returns DLL function name for function f.
+func (f *Fn) DLLFuncName() string {
+	if f.dllfuncname == "" {
+		return f.Name
+	}
+	return f.dllfuncname
+}
+
+// ParamList returns source code for function f parameters.
+func (f *Fn) ParamList() string {
+	return join(f.Params, func(p *Param) string { return p.Name + " " + p.Type }, ", ")
+}
+
+// HelperParamList returns source code for helper function f parameters.
+func (f *Fn) HelperParamList() string {
+	return join(f.Params, func(p *Param) string { return p.Name + " " + p.HelperType() }, ", ")
+}
+
+// ParamPrintList returns source code of trace printing part correspondent
+// to syscall input parameters.
+func (f *Fn) ParamPrintList() string {
+	return join(f.Params, func(p *Param) string { return fmt.Sprintf(`"%s=", %s, `, p.Name, p.Name) }, `", ", `)
+}
+
+// ParamCount return number of syscall parameters for function f.
+func (f *Fn) ParamCount() int {
+	n := 0
+	for _, p := range f.Params {
+		n += len(p.SyscallArgList())
+	}
+	return n
+}
+
+// SyscallParamCount determines which version of Syscall/Syscall6/Syscall9/...
+// to use. It returns parameter count for correspondent SyscallX function.
+func (f *Fn) SyscallParamCount() int {
+	n := f.ParamCount()
+	switch {
+	case n <= 3:
+		return 3
+	case n <= 6:
+		return 6
+	case n <= 9:
+		return 9
+	case n <= 12:
+		return 12
+	case n <= 15:
+		return 15
+	default:
+		panic("too many arguments to system call")
+	}
+}
+
+// Syscall determines which SyscallX function to use for function f.
+func (f *Fn) Syscall() string {
+	c := f.SyscallParamCount()
+	if c == 3 {
+		return syscalldot() + "Syscall"
+	}
+	return syscalldot() + "Syscall" + strconv.Itoa(c)
+}
+
+// SyscallParamList returns source code for SyscallX parameters for function f.
+func (f *Fn) SyscallParamList() string {
+	a := make([]string, 0)
+	for _, p := range f.Params {
+		a = append(a, p.SyscallArgList()...)
+	}
+	for len(a) < f.SyscallParamCount() {
+		a = append(a, "0")
+	}
+	return strings.Join(a, ", ")
+}
+
+// HelperCallParamList returns source code of call into function f helper.
+func (f *Fn) HelperCallParamList() string {
+	a := make([]string, 0, len(f.Params))
+	for _, p := range f.Params {
+		s := p.Name
+		if p.Type == "string" {
+			s = p.tmpVar()
+		}
+		a = append(a, s)
+	}
+	return strings.Join(a, ", ")
+}
+
+// IsUTF16 is true, if f is W (utf16) function. It is false
+// for all A (ascii) functions.
+func (f *Fn) IsUTF16() bool {
+	return true
+}
+
+// StrconvFunc returns name of Go string to OS string function for f.
+func (f *Fn) StrconvFunc() string {
+	if f.IsUTF16() {
+		return syscalldot() + "UTF16PtrFromString"
+	}
+	return syscalldot() + "BytePtrFromString"
+}
+
+// StrconvType returns Go type name used for OS string for f.
+func (f *Fn) StrconvType() string {
+	if f.IsUTF16() {
+		return "*uint16"
+	}
+	return "*byte"
+}
+
+// HasStringParam is true, if f has at least one string parameter.
+// Otherwise it is false.
+func (f *Fn) HasStringParam() bool {
+	for _, p := range f.Params {
+		if p.Type == "string" {
+			return true
+		}
+	}
+	return false
+}
+
+// HelperName returns name of function f helper.
+func (f *Fn) HelperName() string {
+	if !f.HasStringParam() {
+		return f.Name
+	}
+	return "_" + f.Name
+}
+
+// Source files and functions.
+type Source struct {
+	Funcs           []*Fn
+	Files           []string
+	StdLibImports   []string
+	ExternalImports []string
+}
+
+func (src *Source) Import(pkg string) {
+	src.StdLibImports = append(src.StdLibImports, pkg)
+	sort.Strings(src.StdLibImports)
+}
+
+func (src *Source) ExternalImport(pkg string) {
+	src.ExternalImports = append(src.ExternalImports, pkg)
+	sort.Strings(src.ExternalImports)
+}
+
+// ParseFiles parses files listed in fs and extracts all syscall
+// functions listed in  sys comments. It returns source files
+// and functions collection *Source if successful.
+func ParseFiles(fs []string) (*Source, error) {
+	src := &Source{
+		Funcs: make([]*Fn, 0),
+		Files: make([]string, 0),
+		StdLibImports: []string{
+			"unsafe",
+		},
+		ExternalImports: make([]string, 0),
+	}
+	for _, file := range fs {
+		if err := src.ParseFile(file); err != nil {
+			return nil, err
+		}
+	}
+	return src, nil
+}
+
+// DLLs return dll names for a source set src.
+func (src *Source) DLLs() []string {
+	uniq := make(map[string]bool)
+	r := make([]string, 0)
+	for _, f := range src.Funcs {
+		name := f.DLLName()
+		if _, found := uniq[name]; !found {
+			uniq[name] = true
+			r = append(r, name)
+		}
+	}
+	return r
+}
+
+// ParseFile adds additional file path to a source set src.
+func (src *Source) ParseFile(path string) error {
+	file, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	s := bufio.NewScanner(file)
+	for s.Scan() {
+		t := trim(s.Text())
+		if len(t) < 7 {
+			continue
+		}
+		if !strings.HasPrefix(t, "//sys") {
+			continue
+		}
+		t = t[5:]
+		if !(t[0] == ' ' || t[0] == '\t') {
+			continue
+		}
+		f, err := newFn(t[1:])
+		if err != nil {
+			return err
+		}
+		src.Funcs = append(src.Funcs, f)
+	}
+	if err := s.Err(); err != nil {
+		return err
+	}
+	src.Files = append(src.Files, path)
+
+	// get package name
+	fset := token.NewFileSet()
+	_, err = file.Seek(0, 0)
+	if err != nil {
+		return err
+	}
+	pkg, err := parser.ParseFile(fset, "", file, parser.PackageClauseOnly)
+	if err != nil {
+		return err
+	}
+	packageName = pkg.Name.Name
+
+	return nil
+}
+
+// IsStdRepo returns true if src is part of standard library.
+func (src *Source) IsStdRepo() (bool, error) {
+	if len(src.Files) == 0 {
+		return false, errors.New("no input files provided")
+	}
+	abspath, err := filepath.Abs(src.Files[0])
+	if err != nil {
+		return false, err
+	}
+	goroot := runtime.GOROOT()
+	if runtime.GOOS == "windows" {
+		abspath = strings.ToLower(abspath)
+		goroot = strings.ToLower(goroot)
+	}
+	sep := string(os.PathSeparator)
+	if !strings.HasSuffix(goroot, sep) {
+		goroot += sep
+	}
+	return strings.HasPrefix(abspath, goroot), nil
+}
+
+// Generate output source file from a source set src.
+func (src *Source) Generate(w io.Writer) error {
+	const (
+		pkgStd         = iota // any package in std library
+		pkgXSysWindows        // x/sys/windows package
+		pkgOther
+	)
+	isStdRepo, err := src.IsStdRepo()
+	if err != nil {
+		return err
+	}
+	var pkgtype int
+	switch {
+	case isStdRepo:
+		pkgtype = pkgStd
+	case packageName == "windows":
+		// TODO: this needs better logic than just using package name
+		pkgtype = pkgXSysWindows
+	default:
+		pkgtype = pkgOther
+	}
+	if *systemDLL {
+		switch pkgtype {
+		case pkgStd:
+			src.Import("internal/syscall/windows/sysdll")
+		case pkgXSysWindows:
+		default:
+			src.ExternalImport("golang.org/x/sys/windows")
+		}
+	}
+	if packageName != "syscall" {
+		src.Import("syscall")
+	}
+	funcMap := template.FuncMap{
+		"packagename": packagename,
+		"syscalldot":  syscalldot,
+		"newlazydll": func(dll string) string {
+			arg := "\"" + dll + ".dll\""
+			if !*systemDLL {
+				return syscalldot() + "NewLazyDLL(" + arg + ")"
+			}
+			switch pkgtype {
+			case pkgStd:
+				return syscalldot() + "NewLazyDLL(sysdll.Add(" + arg + "))"
+			case pkgXSysWindows:
+				return "NewLazySystemDLL(" + arg + ")"
+			default:
+				return "windows.NewLazySystemDLL(" + arg + ")"
+			}
+		},
+	}
+	t := template.Must(template.New("main").Funcs(funcMap).Parse(srcTemplate))
+	err = t.Execute(w, src)
+	if err != nil {
+		return errors.New("Failed to execute template: " + err.Error())
+	}
+	return nil
+}
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: mksyscall_windows [flags] [path ...]\n")
+	flag.PrintDefaults()
+	os.Exit(1)
+}
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+	if len(flag.Args()) <= 0 {
+		fmt.Fprintf(os.Stderr, "no files to parse provided\n")
+		usage()
+	}
+
+	src, err := ParseFiles(flag.Args())
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var buf bytes.Buffer
+	if err := src.Generate(&buf); err != nil {
+		log.Fatal(err)
+	}
+
+	data, err := format.Source(buf.Bytes())
+	if err != nil {
+		log.Fatal(err)
+	}
+	if *filename == "" {
+		_, err = os.Stdout.Write(data)
+	} else {
+		err = ioutil.WriteFile(*filename, data, 0644)
+	}
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+// TODO: use println instead to print in the following template
+const srcTemplate = `
+
+{{define "main"}}// MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
+
+package {{packagename}}
+
+import (
+{{range .StdLibImports}}"{{.}}"
+{{end}}
+
+{{range .ExternalImports}}"{{.}}"
+{{end}}
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = {{syscalldot}}Errno(errnoERROR_IO_PENDING)
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e {{syscalldot}}Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+{{template "dlls" .}}
+{{template "funcnames" .}})
+{{range .Funcs}}{{if .HasStringParam}}{{template "helperbody" .}}{{end}}{{template "funcbody" .}}{{end}}
+{{end}}
+
+{{/* help functions */}}
+
+{{define "dlls"}}{{range .DLLs}}	mod{{.}} = {{newlazydll .}}
+{{end}}{{end}}
+
+{{define "funcnames"}}{{range .Funcs}}	proc{{.DLLFuncName}} = mod{{.DLLName}}.NewProc("{{.DLLFuncName}}")
+{{end}}{{end}}
+
+{{define "helperbody"}}
+func {{.Name}}({{.ParamList}}) {{template "results" .}}{
+{{template "helpertmpvars" .}}	return {{.HelperName}}({{.HelperCallParamList}})
+}
+{{end}}
+
+{{define "funcbody"}}
+func {{.HelperName}}({{.HelperParamList}}) {{template "results" .}}{
+{{template "tmpvars" .}}	{{template "syscall" .}}
+{{template "seterror" .}}{{template "printtrace" .}}	return
+}
+{{end}}
+
+{{define "helpertmpvars"}}{{range .Params}}{{if .TmpVarHelperCode}}	{{.TmpVarHelperCode}}
+{{end}}{{end}}{{end}}
+
+{{define "tmpvars"}}{{range .Params}}{{if .TmpVarCode}}	{{.TmpVarCode}}
+{{end}}{{end}}{{end}}
+
+{{define "results"}}{{if .Rets.List}}{{.Rets.List}} {{end}}{{end}}
+
+{{define "syscall"}}{{.Rets.SetReturnValuesCode}}{{.Syscall}}(proc{{.DLLFuncName}}.Addr(), {{.ParamCount}}, {{.SyscallParamList}}){{end}}
+
+{{define "seterror"}}{{if .Rets.SetErrorCode}}	{{.Rets.SetErrorCode}}
+{{end}}{{end}}
+
+{{define "printtrace"}}{{if .PrintTrace}}	print("SYSCALL: {{.Name}}(", {{.ParamPrintList}}") (", {{.Rets.PrintList}}")\n")
+{{end}}{{end}}
+
+`

vendor/github.com/Microsoft/go-winio/vhd/vhd.go

@@ -0,0 +1,82 @@
+// +build windows
+
+package vhd
+
+import "syscall"
+
+//go:generate go run mksyscall_windows.go -output zvhd.go vhd.go
+
+//sys createVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) [failretval != 0] = VirtDisk.CreateVirtualDisk
+
+type virtualStorageType struct {
+	DeviceID uint32
+	VendorID [16]byte
+}
+
+const virtualDiskAccessNONE uint32 = 0
+const virtualDiskAccessATTACHRO uint32 = 65536
+const virtualDiskAccessATTACHRW uint32 = 131072
+const virtualDiskAccessDETACH uint32 = 262144
+const virtualDiskAccessGETINFO uint32 = 524288
+const virtualDiskAccessCREATE uint32 = 1048576
+const virtualDiskAccessMETAOPS uint32 = 2097152
+const virtualDiskAccessREAD uint32 = 851968
+const virtualDiskAccessALL uint32 = 4128768
+const virtualDiskAccessWRITABLE uint32 = 3276800
+
+const createVirtualDiskFlagNone uint32 = 0
+const createVirtualDiskFlagFullPhysicalAllocation uint32 = 1
+const createVirtualDiskFlagPreventWritesToSourceDisk uint32 = 2
+const createVirtualDiskFlagDoNotCopyMetadataFromParent uint32 = 4
+
+type version2 struct {
+	UniqueID                 [16]byte // GUID
+	MaximumSize              uint64
+	BlockSizeInBytes         uint32
+	SectorSizeInBytes        uint32
+	ParentPath               *uint16 // string
+	SourcePath               *uint16 // string
+	OpenFlags                uint32
+	ParentVirtualStorageType virtualStorageType
+	SourceVirtualStorageType virtualStorageType
+	ResiliencyGUID           [16]byte // GUID
+}
+
+type createVirtualDiskParameters struct {
+	Version  uint32 // Must always be set to 2
+	Version2 version2
+}
+
+// CreateVhdx will create a simple vhdx file at the given path using default values.
+func CreateVhdx(path string, maxSizeInGb, blockSizeInMb uint32) error {
+	var defaultType virtualStorageType
+
+	parameters := createVirtualDiskParameters{
+		Version: 2,
+		Version2: version2{
+			MaximumSize:      uint64(maxSizeInGb) * 1024 * 1024 * 1024,
+			BlockSizeInBytes: blockSizeInMb * 1024 * 1024,
+		},
+	}
+
+	var handle syscall.Handle
+
+	if err := createVirtualDisk(
+		&defaultType,
+		path,
+		virtualDiskAccessNONE,
+		nil,
+		createVirtualDiskFlagNone,
+		0,
+		&parameters,
+		nil,
+		&handle); err != nil {
+		return err
+	}
+
+	if err := syscall.CloseHandle(handle); err != nil {
+		return err
+	}
+
+	return nil
+}

vendor/github.com/Microsoft/go-winio/vhd/zvhd.go

@@ -0,0 +1,64 @@
+// MACHINE GENERATED BY 'go generate' COMMAND; DO NOT EDIT
+
+package vhd
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+	modVirtDisk = windows.NewLazySystemDLL("VirtDisk.dll")
+
+	procCreateVirtualDisk = modVirtDisk.NewProc("CreateVirtualDisk")
+)
+
+func createVirtualDisk(virtualStorageType *virtualStorageType, path string, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) {
+	var _p0 *uint16
+	_p0, err = syscall.UTF16PtrFromString(path)
+	if err != nil {
+		return
+	}
+	return _createVirtualDisk(virtualStorageType, _p0, virtualDiskAccessMask, securityDescriptor, flags, providerSpecificFlags, parameters, o, handle)
+}
+
+func _createVirtualDisk(virtualStorageType *virtualStorageType, path *uint16, virtualDiskAccessMask uint32, securityDescriptor *uintptr, flags uint32, providerSpecificFlags uint32, parameters *createVirtualDiskParameters, o *syscall.Overlapped, handle *syscall.Handle) (err error) {
+	r1, _, e1 := syscall.Syscall9(procCreateVirtualDisk.Addr(), 9, uintptr(unsafe.Pointer(virtualStorageType)), uintptr(unsafe.Pointer(path)), uintptr(virtualDiskAccessMask), uintptr(unsafe.Pointer(securityDescriptor)), uintptr(flags), uintptr(providerSpecificFlags), uintptr(unsafe.Pointer(parameters)), uintptr(unsafe.Pointer(o)), uintptr(unsafe.Pointer(handle)))
+	if r1 != 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}

vendor/github.com/Microsoft/go-winio/wim/decompress.go

@@ -0,0 +1,138 @@
+package wim
+
+import (
+	"encoding/binary"
+	"io"
+	"io/ioutil"
+
+	"github.com/Microsoft/go-winio/wim/lzx"
+)
+
+const chunkSize = 32768 // Compressed resource chunk size
+
+type compressedReader struct {
+	r            *io.SectionReader
+	d            io.ReadCloser
+	chunks       []int64
+	curChunk     int
+	originalSize int64
+}
+
+func newCompressedReader(r *io.SectionReader, originalSize int64, offset int64) (*compressedReader, error) {
+	nchunks := (originalSize + chunkSize - 1) / chunkSize
+	var base int64
+	chunks := make([]int64, nchunks)
+	if originalSize <= 0xffffffff {
+		// 32-bit chunk offsets
+		base = (nchunks - 1) * 4
+		chunks32 := make([]uint32, nchunks-1)
+		err := binary.Read(r, binary.LittleEndian, chunks32)
+		if err != nil {
+			return nil, err
+		}
+		for i, n := range chunks32 {
+			chunks[i+1] = int64(n)
+		}
+
+	} else {
+		// 64-bit chunk offsets
+		base = (nchunks - 1) * 8
+		err := binary.Read(r, binary.LittleEndian, chunks[1:])
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for i, c := range chunks {
+		chunks[i] = c + base
+	}
+
+	cr := &compressedReader{
+		r:            r,
+		chunks:       chunks,
+		originalSize: originalSize,
+	}
+
+	err := cr.reset(int(offset / chunkSize))
+	if err != nil {
+		return nil, err
+	}
+
+	suboff := offset % chunkSize
+	if suboff != 0 {
+		_, err := io.CopyN(ioutil.Discard, cr.d, suboff)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return cr, nil
+}
+
+func (r *compressedReader) chunkOffset(n int) int64 {
+	if n == len(r.chunks) {
+		return r.r.Size()
+	}
+	return r.chunks[n]
+}
+
+func (r *compressedReader) chunkSize(n int) int {
+	return int(r.chunkOffset(n+1) - r.chunkOffset(n))
+}
+
+func (r *compressedReader) uncompressedSize(n int) int {
+	if n < len(r.chunks)-1 {
+		return chunkSize
+	}
+	size := int(r.originalSize % chunkSize)
+	if size == 0 {
+		size = chunkSize
+	}
+	return size
+}
+
+func (r *compressedReader) reset(n int) error {
+	if n >= len(r.chunks) {
+		return io.EOF
+	}
+	if r.d != nil {
+		r.d.Close()
+	}
+	r.curChunk = n
+	size := r.chunkSize(n)
+	uncompressedSize := r.uncompressedSize(n)
+	section := io.NewSectionReader(r.r, r.chunkOffset(n), int64(size))
+	if size != uncompressedSize {
+		d, err := lzx.NewReader(section, uncompressedSize)
+		if err != nil {
+			return err
+		}
+		r.d = d
+	} else {
+		r.d = ioutil.NopCloser(section)
+	}
+
+	return nil
+}
+
+func (r *compressedReader) Read(b []byte) (int, error) {
+	for {
+		n, err := r.d.Read(b)
+		if err != io.EOF {
+			return n, err
+		}
+
+		err = r.reset(r.curChunk + 1)
+		if err != nil {
+			return n, err
+		}
+	}
+}
+
+func (r *compressedReader) Close() error {
+	var err error
+	if r.d != nil {
+		err = r.d.Close()
+		r.d = nil
+	}
+	return err
+}

vendor/github.com/Microsoft/go-winio/wim/lzx/lzx.go

@@ -0,0 +1,606 @@
+// Package lzx implements a decompressor for the the WIM variant of the
+// LZX compression algorithm.
+//
+// The LZX algorithm is an earlier variant of LZX DELTA, which is documented
+// at https://msdn.microsoft.com/en-us/library/cc483133(v=exchg.80).aspx.
+package lzx
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+)
+
+const (
+	maincodecount = 496
+	maincodesplit = 256
+	lencodecount  = 249
+	lenshift      = 9
+	codemask      = 0x1ff
+	tablebits     = 9
+	tablesize     = 1 << tablebits
+
+	maxBlockSize = 32768
+	windowSize   = 32768
+
+	maxTreePathLen = 16
+
+	e8filesize  = 12000000
+	maxe8offset = 0x3fffffff
+
+	verbatimBlock      = 1
+	alignedOffsetBlock = 2
+	uncompressedBlock  = 3
+)
+
+var footerBits = [...]byte{
+	0, 0, 0, 0, 1, 1, 2, 2,
+	3, 3, 4, 4, 5, 5, 6, 6,
+	7, 7, 8, 8, 9, 9, 10, 10,
+	11, 11, 12, 12, 13, 13, 14,
+}
+
+var basePosition = [...]uint16{
+	0, 1, 2, 3, 4, 6, 8, 12,
+	16, 24, 32, 48, 64, 96, 128, 192,
+	256, 384, 512, 768, 1024, 1536, 2048, 3072,
+	4096, 6144, 8192, 12288, 16384, 24576, 32768,
+}
+
+var (
+	errCorrupt = errors.New("LZX data corrupt")
+)
+
+// Reader is an interface used by the decompressor to access
+// the input stream. If the provided io.Reader does not implement
+// Reader, then a bufio.Reader is used.
+type Reader interface {
+	io.Reader
+	io.ByteReader
+}
+
+type decompressor struct {
+	r            io.Reader
+	err          error
+	unaligned    bool
+	nbits        byte
+	c            uint32
+	lru          [3]uint16
+	uncompressed int
+	windowReader *bytes.Reader
+	mainlens     [maincodecount]byte
+	lenlens      [lencodecount]byte
+	window       [windowSize]byte
+	b            []byte
+	bv           int
+	bo           int
+}
+
+//go:noinline
+func (f *decompressor) fail(err error) {
+	if f.err == nil {
+		f.err = err
+	}
+	f.bo = 0
+	f.bv = 0
+}
+
+func (f *decompressor) ensureAtLeast(n int) error {
+	if f.bv-f.bo >= n {
+		return nil
+	}
+
+	if f.err != nil {
+		return f.err
+	}
+
+	if f.bv != f.bo {
+		copy(f.b[:f.bv-f.bo], f.b[f.bo:f.bv])
+	}
+	n, err := io.ReadAtLeast(f.r, f.b[f.bv-f.bo:], n)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		} else {
+			f.fail(err)
+		}
+		return err
+	}
+	f.bv = f.bv - f.bo + n
+	f.bo = 0
+	return nil
+}
+
+// feed retrieves another 16-bit word from the stream and consumes
+// it into f.c. It returns false if there are no more bytes available.
+// Otherwise, on error, it sets f.err.
+func (f *decompressor) feed() bool {
+	err := f.ensureAtLeast(2)
+	if err != nil {
+		if err == io.ErrUnexpectedEOF {
+			return false
+		}
+	}
+	f.c |= (uint32(f.b[f.bo+1])<<8 | uint32(f.b[f.bo])) << (16 - f.nbits)
+	f.nbits += 16
+	f.bo += 2
+	return true
+}
+
+// getBits retrieves the next n bits from the byte stream. n
+// must be <= 16. It sets f.err on error.
+func (f *decompressor) getBits(n byte) uint16 {
+	if f.nbits < n {
+		if !f.feed() {
+			f.fail(io.ErrUnexpectedEOF)
+		}
+	}
+	c := uint16(f.c >> (32 - n))
+	f.c <<= n
+	f.nbits -= n
+	return c
+}
+
+type huffman struct {
+	extra   [][]uint16
+	maxbits byte
+	table   [tablesize]uint16
+}
+
+// buildTable builds a huffman decoding table from a slice of code lengths,
+// one per code, in order. Each code length must be <= maxTreePathLen.
+// See https://en.wikipedia.org/wiki/Canonical_Huffman_code.
+func buildTable(codelens []byte) *huffman {
+	// Determine the number of codes of each length, and the
+	// maximum length.
+	var count [maxTreePathLen + 1]uint
+	var max byte
+	for _, cl := range codelens {
+		count[cl]++
+		if max < cl {
+			max = cl
+		}
+	}
+
+	if max == 0 {
+		return &huffman{}
+	}
+
+	// Determine the first code of each length.
+	var first [maxTreePathLen + 1]uint
+	code := uint(0)
+	for i := byte(1); i <= max; i++ {
+		code <<= 1
+		first[i] = code
+		code += count[i]
+	}
+
+	if code != 1<<max {
+		return nil
+	}
+
+	// Build a table for code lookup. For code sizes < max,
+	// put all possible suffixes for the code into the table, too.
+	// For max > tablebits, split long codes into additional tables
+	// of suffixes of max-tablebits length.
+	h := &huffman{maxbits: max}
+	if max > tablebits {
+		core := first[tablebits+1] / 2 // Number of codes that fit without extra tables
+		nextra := 1<<tablebits - core  // Number of extra entries
+		h.extra = make([][]uint16, nextra)
+		for code := core; code < 1<<tablebits; code++ {
+			h.table[code] = uint16(code - core)
+			h.extra[code-core] = make([]uint16, 1<<(max-tablebits))
+		}
+	}
+
+	for i, cl := range codelens {
+		if cl != 0 {
+			code := first[cl]
+			first[cl]++
+			v := uint16(cl)<<lenshift | uint16(i)
+			if cl <= tablebits {
+				extendedCode := code << (tablebits - cl)
+				for j := uint(0); j < 1<<(tablebits-cl); j++ {
+					h.table[extendedCode+j] = v
+				}
+			} else {
+				prefix := code >> (cl - tablebits)
+				suffix := code & (1<<(cl-tablebits) - 1)
+				extendedCode := suffix << (max - cl)
+				for j := uint(0); j < 1<<(max-cl); j++ {
+					h.extra[h.table[prefix]][extendedCode+j] = v
+				}
+			}
+		}
+	}
+
+	return h
+}
+
+// getCode retrieves the next code using the provided
+// huffman tree. It sets f.err on error.
+func (f *decompressor) getCode(h *huffman) uint16 {
+	if h.maxbits > 0 {
+		if f.nbits < maxTreePathLen {
+			f.feed()
+		}
+
+		// For codes with length < tablebits, it doesn't matter
+		// what the remainder of the bits used for table lookup
+		// are, since entries with all possible suffixes were
+		// added to the table.
+		c := h.table[f.c>>(32-tablebits)]
+		if c >= 1<<lenshift {
+			// The code is already in c.
+		} else {
+			c = h.extra[c][f.c<<tablebits>>(32-(h.maxbits-tablebits))]
+		}
+
+		n := byte(c >> lenshift)
+		if f.nbits >= n {
+			// Only consume the length of the code, not the maximum
+			// code length.
+			f.c <<= n
+			f.nbits -= n
+			return c & codemask
+		}
+
+		f.fail(io.ErrUnexpectedEOF)
+		return 0
+	}
+
+	// This is an empty tree. It should not be used.
+	f.fail(errCorrupt)
+	return 0
+}
+
+// readTree updates the huffman tree path lengths in lens by
+// reading and decoding lengths from the byte stream. lens
+// should be prepopulated with the previous block's tree's path
+// lengths. For the first block, lens should be zero.
+func (f *decompressor) readTree(lens []byte) error {
+	// Get the pre-tree for the main tree.
+	var pretreeLen [20]byte
+	for i := range pretreeLen {
+		pretreeLen[i] = byte(f.getBits(4))
+	}
+	if f.err != nil {
+		return f.err
+	}
+	h := buildTable(pretreeLen[:])
+
+	// The lengths are encoded as a series of huffman codes
+	// encoded by the pre-tree.
+	for i := 0; i < len(lens); {
+		c := byte(f.getCode(h))
+		if f.err != nil {
+			return f.err
+		}
+		switch {
+		case c <= 16: // length is delta from previous length
+			lens[i] = (lens[i] + 17 - c) % 17
+			i++
+		case c == 17: // next n + 4 lengths are zero
+			zeroes := int(f.getBits(4)) + 4
+			if i+zeroes > len(lens) {
+				return errCorrupt
+			}
+			for j := 0; j < zeroes; j++ {
+				lens[i+j] = 0
+			}
+			i += zeroes
+		case c == 18: // next n + 20 lengths are zero
+			zeroes := int(f.getBits(5)) + 20
+			if i+zeroes > len(lens) {
+				return errCorrupt
+			}
+			for j := 0; j < zeroes; j++ {
+				lens[i+j] = 0
+			}
+			i += zeroes
+		case c == 19: // next n + 4 lengths all have the same value
+			same := int(f.getBits(1)) + 4
+			if i+same > len(lens) {
+				return errCorrupt
+			}
+			c = byte(f.getCode(h))
+			if c > 16 {
+				return errCorrupt
+			}
+			l := (lens[i] + 17 - c) % 17
+			for j := 0; j < same; j++ {
+				lens[i+j] = l
+			}
+			i += same
+		default:
+			return errCorrupt
+		}
+	}
+
+	if f.err != nil {
+		return f.err
+	}
+	return nil
+}
+
+func (f *decompressor) readBlockHeader() (byte, uint16, error) {
+	// If the previous block was an unaligned uncompressed block, restore
+	// 2-byte alignment.
+	if f.unaligned {
+		err := f.ensureAtLeast(1)
+		if err != nil {
+			return 0, 0, err
+		}
+		f.bo++
+		f.unaligned = false
+	}
+
+	blockType := f.getBits(3)
+	full := f.getBits(1)
+	var blockSize uint16
+	if full != 0 {
+		blockSize = maxBlockSize
+	} else {
+		blockSize = f.getBits(16)
+		if blockSize > maxBlockSize {
+			return 0, 0, errCorrupt
+		}
+	}
+
+	if f.err != nil {
+		return 0, 0, f.err
+	}
+
+	switch blockType {
+	case verbatimBlock, alignedOffsetBlock:
+		// The caller will read the huffman trees.
+	case uncompressedBlock:
+		if f.nbits > 16 {
+			panic("impossible: more than one 16-bit word remains")
+		}
+
+		// Drop the remaining bits in the current 16-bit word
+		// If there are no bits left, discard a full 16-bit word.
+		n := f.nbits
+		if n == 0 {
+			n = 16
+		}
+
+		f.getBits(n)
+
+		// Read the LRU values for the next block.
+		err := f.ensureAtLeast(12)
+		if err != nil {
+			return 0, 0, err
+		}
+
+		f.lru[0] = uint16(binary.LittleEndian.Uint32(f.b[f.bo : f.bo+4]))
+		f.lru[1] = uint16(binary.LittleEndian.Uint32(f.b[f.bo+4 : f.bo+8]))
+		f.lru[2] = uint16(binary.LittleEndian.Uint32(f.b[f.bo+8 : f.bo+12]))
+		f.bo += 12
+
+	default:
+		return 0, 0, errCorrupt
+	}
+
+	return byte(blockType), blockSize, nil
+}
+
+// readTrees reads the two or three huffman trees for the current block.
+// readAligned specifies whether to read the aligned offset tree.
+func (f *decompressor) readTrees(readAligned bool) (main *huffman, length *huffman, aligned *huffman, err error) {
+	// Aligned offset blocks start with a small aligned offset tree.
+	if readAligned {
+		var alignedLen [8]byte
+		for i := range alignedLen {
+			alignedLen[i] = byte(f.getBits(3))
+		}
+		aligned = buildTable(alignedLen[:])
+		if aligned == nil {
+			err = errors.New("corrupt")
+			return
+		}
+	}
+
+	// The main tree is encoded in two parts.
+	err = f.readTree(f.mainlens[:maincodesplit])
+	if err != nil {
+		return
+	}
+	err = f.readTree(f.mainlens[maincodesplit:])
+	if err != nil {
+		return
+	}
+
+	main = buildTable(f.mainlens[:])
+	if main == nil {
+		err = errors.New("corrupt")
+		return
+	}
+
+	// The length tree is encoding in a single part.
+	err = f.readTree(f.lenlens[:])
+	if err != nil {
+		return
+	}
+
+	length = buildTable(f.lenlens[:])
+	if length == nil {
+		err = errors.New("corrupt")
+		return
+	}
+
+	err = f.err
+	return
+}
+
+// readCompressedBlock decodes a compressed block, writing into the window
+// starting at start and ending at end, and using the provided huffman trees.
+func (f *decompressor) readCompressedBlock(start, end uint16, hmain, hlength, haligned *huffman) (int, error) {
+	i := start
+	for i < end {
+		main := f.getCode(hmain)
+		if f.err != nil {
+			break
+		}
+		if main < 256 {
+			// Literal byte.
+			f.window[i] = byte(main)
+			i++
+			continue
+		}
+
+		// This is a match backward in the window. Determine
+		// the offset and dlength.
+		matchlen := (main - 256) % 8
+		slot := (main - 256) / 8
+
+		// The length is either the low bits of the code,
+		// or if this is 7, is encoded with the length tree.
+		if matchlen == 7 {
+			matchlen += f.getCode(hlength)
+		}
+		matchlen += 2
+
+		var matchoffset uint16
+		if slot < 3 {
+			// The offset is one of the LRU values.
+			matchoffset = f.lru[slot]
+			f.lru[slot] = f.lru[0]
+			f.lru[0] = matchoffset
+		} else {
+			// The offset is encoded as a combination of the
+			// slot and more bits from the bit stream.
+			offsetbits := footerBits[slot]
+			var verbatimbits, alignedbits uint16
+			if offsetbits > 0 {
+				if haligned != nil && offsetbits >= 3 {
+					// This is an aligned offset block. Combine
+					// the bits written verbatim with the aligned
+					// offset tree code.
+					verbatimbits = f.getBits(offsetbits-3) * 8
+					alignedbits = f.getCode(haligned)
+				} else {
+					// There are no aligned offset bits to read,
+					// only verbatim bits.
+					verbatimbits = f.getBits(offsetbits)
+					alignedbits = 0
+				}
+			}
+			matchoffset = basePosition[slot] + verbatimbits + alignedbits - 2
+			// Update the LRU cache.
+			f.lru[2] = f.lru[1]
+			f.lru[1] = f.lru[0]
+			f.lru[0] = matchoffset
+		}
+
+		if matchoffset <= i && matchlen <= end-i {
+			copyend := i + matchlen
+			for ; i < copyend; i++ {
+				f.window[i] = f.window[i-matchoffset]
+			}
+		} else {
+			f.fail(errCorrupt)
+			break
+		}
+	}
+	return int(i - start), f.err
+}
+
+// readBlock decodes the current block and returns the number of uncompressed bytes.
+func (f *decompressor) readBlock(start uint16) (int, error) {
+	blockType, size, err := f.readBlockHeader()
+	if err != nil {
+		return 0, err
+	}
+
+	if blockType == uncompressedBlock {
+		if size%2 == 1 {
+			// Remember to realign the byte stream at the next block.
+			f.unaligned = true
+		}
+		copied := 0
+		if f.bo < f.bv {
+			copied = int(size)
+			s := int(start)
+			if copied > f.bv-f.bo {
+				copied = f.bv - f.bo
+			}
+			copy(f.window[s:s+copied], f.b[f.bo:f.bo+copied])
+			f.bo += copied
+		}
+		n, err := io.ReadFull(f.r, f.window[start+uint16(copied):start+size])
+		return copied + n, err
+	}
+
+	hmain, hlength, haligned, err := f.readTrees(blockType == alignedOffsetBlock)
+	if err != nil {
+		return 0, err
+	}
+
+	return f.readCompressedBlock(start, start+size, hmain, hlength, haligned)
+}
+
+// decodeE8 reverses the 0xe8 x86 instruction encoding that was performed
+// to the uncompressed data before it was compressed.
+func decodeE8(b []byte, off int64) {
+	if off > maxe8offset || len(b) < 10 {
+		return
+	}
+	for i := 0; i < len(b)-10; i++ {
+		if b[i] == 0xe8 {
+			currentPtr := int32(off) + int32(i)
+			abs := int32(binary.LittleEndian.Uint32(b[i+1 : i+5]))
+			if abs >= -currentPtr && abs < e8filesize {
+				var rel int32
+				if abs >= 0 {
+					rel = abs - currentPtr
+				} else {
+					rel = abs + e8filesize
+				}
+				binary.LittleEndian.PutUint32(b[i+1:i+5], uint32(rel))
+			}
+			i += 4
+		}
+	}
+}
+
+func (f *decompressor) Read(b []byte) (int, error) {
+	// Read and uncompress everything.
+	if f.windowReader == nil {
+		n := 0
+		for n < f.uncompressed {
+			k, err := f.readBlock(uint16(n))
+			if err != nil {
+				return 0, err
+			}
+			n += k
+		}
+		decodeE8(f.window[:f.uncompressed], 0)
+		f.windowReader = bytes.NewReader(f.window[:f.uncompressed])
+	}
+
+	// Just read directly from the window.
+	return f.windowReader.Read(b)
+}
+
+func (f *decompressor) Close() error {
+	return nil
+}
+
+// NewReader returns a new io.ReadCloser that decompresses a
+// WIM LZX stream until uncompressedSize bytes have been returned.
+func NewReader(r io.Reader, uncompressedSize int) (io.ReadCloser, error) {
+	if uncompressedSize > windowSize {
+		return nil, errors.New("uncompressed size is limited to 32KB")
+	}
+	f := &decompressor{
+		lru:          [3]uint16{1, 1, 1},
+		uncompressed: uncompressedSize,
+		b:            make([]byte, 4096),
+		r:            r,
+	}
+	return f, nil
+}

vendor/github.com/Microsoft/go-winio/wim/validate/validate.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/Microsoft/go-winio/wim"
+)
+
+func main() {
+	flag.Parse()
+	f, err := os.Open(flag.Arg(0))
+	if err != nil {
+		panic(err)
+	}
+
+	w, err := wim.NewReader(f)
+	if err != nil {
+		panic(err)
+
+	}
+
+	fmt.Printf("%#v\n%#v\n", w.Image[0], w.Image[0].Windows)
+
+	dir, err := w.Image[0].Open()
+	if err != nil {
+		panic(err)
+	}
+
+	err = recur(dir)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func recur(d *wim.File) error {
+	files, err := d.Readdir()
+	if err != nil {
+		return fmt.Errorf("%s: %s", d.Name, err)
+	}
+	for _, f := range files {
+		if f.IsDir() {
+			err = recur(f)
+			if err != nil {
+				return fmt.Errorf("%s: %s", f.Name, err)
+			}
+		}
+	}
+	return nil
+}

vendor/github.com/Microsoft/go-winio/wim/wim.go

@@ -0,0 +1,866 @@
+// Package wim implements a WIM file parser.
+//
+// WIM files are used to distribute Windows file system and container images.
+// They are documented at https://msdn.microsoft.com/en-us/library/windows/desktop/dd861280.aspx.
+package wim
+
+import (
+	"bytes"
+	"crypto/sha1"
+	"encoding/binary"
+	"encoding/xml"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"strconv"
+	"sync"
+	"time"
+	"unicode/utf16"
+)
+
+// File attribute constants from Windows.
+const (
+	FILE_ATTRIBUTE_READONLY            = 0x00000001
+	FILE_ATTRIBUTE_HIDDEN              = 0x00000002
+	FILE_ATTRIBUTE_SYSTEM              = 0x00000004
+	FILE_ATTRIBUTE_DIRECTORY           = 0x00000010
+	FILE_ATTRIBUTE_ARCHIVE             = 0x00000020
+	FILE_ATTRIBUTE_DEVICE              = 0x00000040
+	FILE_ATTRIBUTE_NORMAL              = 0x00000080
+	FILE_ATTRIBUTE_TEMPORARY           = 0x00000100
+	FILE_ATTRIBUTE_SPARSE_FILE         = 0x00000200
+	FILE_ATTRIBUTE_REPARSE_POINT       = 0x00000400
+	FILE_ATTRIBUTE_COMPRESSED          = 0x00000800
+	FILE_ATTRIBUTE_OFFLINE             = 0x00001000
+	FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000
+	FILE_ATTRIBUTE_ENCRYPTED           = 0x00004000
+	FILE_ATTRIBUTE_INTEGRITY_STREAM    = 0x00008000
+	FILE_ATTRIBUTE_VIRTUAL             = 0x00010000
+	FILE_ATTRIBUTE_NO_SCRUB_DATA       = 0x00020000
+	FILE_ATTRIBUTE_EA                  = 0x00040000
+)
+
+// Windows processor architectures.
+const (
+	PROCESSOR_ARCHITECTURE_INTEL         = 0
+	PROCESSOR_ARCHITECTURE_MIPS          = 1
+	PROCESSOR_ARCHITECTURE_ALPHA         = 2
+	PROCESSOR_ARCHITECTURE_PPC           = 3
+	PROCESSOR_ARCHITECTURE_SHX           = 4
+	PROCESSOR_ARCHITECTURE_ARM           = 5
+	PROCESSOR_ARCHITECTURE_IA64          = 6
+	PROCESSOR_ARCHITECTURE_ALPHA64       = 7
+	PROCESSOR_ARCHITECTURE_MSIL          = 8
+	PROCESSOR_ARCHITECTURE_AMD64         = 9
+	PROCESSOR_ARCHITECTURE_IA32_ON_WIN64 = 10
+	PROCESSOR_ARCHITECTURE_NEUTRAL       = 11
+	PROCESSOR_ARCHITECTURE_ARM64         = 12
+)
+
+var wimImageTag = [...]byte{'M', 'S', 'W', 'I', 'M', 0, 0, 0}
+
+type guid struct {
+	Data1 uint32
+	Data2 uint16
+	Data3 uint16
+	Data4 [8]byte
+}
+
+func (g guid) String() string {
+	return fmt.Sprintf("%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", g.Data1, g.Data2, g.Data3, g.Data4[0], g.Data4[1], g.Data4[2], g.Data4[3], g.Data4[4], g.Data4[5], g.Data4[6], g.Data4[7])
+}
+
+type resourceDescriptor struct {
+	FlagsAndCompressedSize uint64
+	Offset                 int64
+	OriginalSize           int64
+}
+
+type resFlag byte
+
+const (
+	resFlagFree resFlag = 1 << iota
+	resFlagMetadata
+	resFlagCompressed
+	resFlagSpanned
+)
+
+const validate = false
+
+const supportedResFlags = resFlagMetadata | resFlagCompressed
+
+func (r *resourceDescriptor) Flags() resFlag {
+	return resFlag(r.FlagsAndCompressedSize >> 56)
+}
+
+func (r *resourceDescriptor) CompressedSize() int64 {
+	return int64(r.FlagsAndCompressedSize & 0xffffffffffffff)
+}
+
+func (r *resourceDescriptor) String() string {
+	s := fmt.Sprintf("%d bytes at %d", r.CompressedSize(), r.Offset)
+	if r.Flags()&4 != 0 {
+		s += fmt.Sprintf(" (uncompresses to %d)", r.OriginalSize)
+	}
+	return s
+}
+
+// SHA1Hash contains the SHA1 hash of a file or stream.
+type SHA1Hash [20]byte
+
+type streamDescriptor struct {
+	resourceDescriptor
+	PartNumber uint16
+	RefCount   uint32
+	Hash       SHA1Hash
+}
+
+type hdrFlag uint32
+
+const (
+	hdrFlagReserved hdrFlag = 1 << iota
+	hdrFlagCompressed
+	hdrFlagReadOnly
+	hdrFlagSpanned
+	hdrFlagResourceOnly
+	hdrFlagMetadataOnly
+	hdrFlagWriteInProgress
+	hdrFlagRpFix
+)
+
+const (
+	hdrFlagCompressReserved hdrFlag = 1 << (iota + 16)
+	hdrFlagCompressXpress
+	hdrFlagCompressLzx
+)
+
+const supportedHdrFlags = hdrFlagRpFix | hdrFlagReadOnly | hdrFlagCompressed | hdrFlagCompressLzx
+
+type wimHeader struct {
+	ImageTag        [8]byte
+	Size            uint32
+	Version         uint32
+	Flags           hdrFlag
+	CompressionSize uint32
+	WIMGuid         guid
+	PartNumber      uint16
+	TotalParts      uint16
+	ImageCount      uint32
+	OffsetTable     resourceDescriptor
+	XMLData         resourceDescriptor
+	BootMetadata    resourceDescriptor
+	BootIndex       uint32
+	Padding         uint32
+	Integrity       resourceDescriptor
+	Unused          [60]byte
+}
+
+type securityblockDisk struct {
+	TotalLength uint32
+	NumEntries  uint32
+}
+
+const securityblockDiskSize = 8
+
+type direntry struct {
+	Attributes       uint32
+	SecurityID       uint32
+	SubdirOffset     int64
+	Unused1, Unused2 int64
+	CreationTime     Filetime
+	LastAccessTime   Filetime
+	LastWriteTime    Filetime
+	Hash             SHA1Hash
+	Padding          uint32
+	ReparseHardLink  int64
+	StreamCount      uint16
+	ShortNameLength  uint16
+	FileNameLength   uint16
+}
+
+var direntrySize = int64(binary.Size(direntry{}) + 8) // includes an 8-byte length prefix
+
+type streamentry struct {
+	Unused     int64
+	Hash       SHA1Hash
+	NameLength int16
+}
+
+var streamentrySize = int64(binary.Size(streamentry{}) + 8) // includes an 8-byte length prefix
+
+// Filetime represents a Windows time.
+type Filetime struct {
+	LowDateTime  uint32
+	HighDateTime uint32
+}
+
+// Time returns the time as time.Time.
+func (ft *Filetime) Time() time.Time {
+	// 100-nanosecond intervals since January 1, 1601
+	nsec := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
+	// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
+	nsec -= 116444736000000000
+	// convert into nanoseconds
+	nsec *= 100
+	return time.Unix(0, nsec)
+}
+
+// UnmarshalXML unmarshals the time from a WIM XML blob.
+func (ft *Filetime) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type time struct {
+		Low  string `xml:"LOWPART"`
+		High string `xml:"HIGHPART"`
+	}
+	var t time
+	err := d.DecodeElement(&t, &start)
+	if err != nil {
+		return err
+	}
+
+	low, err := strconv.ParseUint(t.Low, 0, 32)
+	if err != nil {
+		return err
+	}
+	high, err := strconv.ParseUint(t.High, 0, 32)
+	if err != nil {
+		return err
+	}
+
+	ft.LowDateTime = uint32(low)
+	ft.HighDateTime = uint32(high)
+	return nil
+}
+
+type info struct {
+	Image []ImageInfo `xml:"IMAGE"`
+}
+
+// ImageInfo contains information about the image.
+type ImageInfo struct {
+	Name         string       `xml:"NAME"`
+	Index        int          `xml:"INDEX,attr"`
+	CreationTime Filetime     `xml:"CREATIONTIME"`
+	ModTime      Filetime     `xml:"LASTMODIFICATIONTIME"`
+	Windows      *WindowsInfo `xml:"WINDOWS"`
+}
+
+// WindowsInfo contains information about the Windows installation in the image.
+type WindowsInfo struct {
+	Arch             byte     `xml:"ARCH"`
+	ProductName      string   `xml:"PRODUCTNAME"`
+	EditionID        string   `xml:"EDITIONID"`
+	InstallationType string   `xml:"INSTALLATIONTYPE"`
+	ProductType      string   `xml:"PRODUCTTYPE"`
+	Languages        []string `xml:"LANGUAGES>LANGUAGE"`
+	DefaultLanguage  string   `xml:"LANGUAGES>DEFAULT"`
+	Version          Version  `xml:"VERSION"`
+	SystemRoot       string   `xml:"SYSTEMROOT"`
+}
+
+// Version represents a Windows build version.
+type Version struct {
+	Major   int `xml:"MAJOR"`
+	Minor   int `xml:"MINOR"`
+	Build   int `xml:"BUILD"`
+	SPBuild int `xml:"SPBUILD"`
+	SPLevel int `xml:"SPLEVEL"`
+}
+
+// ParseError is returned when the WIM cannot be parsed.
+type ParseError struct {
+	Oper string
+	Path string
+	Err  error
+}
+
+func (e *ParseError) Error() string {
+	if e.Path == "" {
+		return "WIM parse error at " + e.Oper + ": " + e.Err.Error()
+	}
+	return fmt.Sprintf("WIM parse error: %s %s: %s", e.Oper, e.Path, e.Err.Error())
+}
+
+// Reader provides functions to read a WIM file.
+type Reader struct {
+	hdr      wimHeader
+	r        io.ReaderAt
+	fileData map[SHA1Hash]resourceDescriptor
+
+	XMLInfo string   // The XML information about the WIM.
+	Image   []*Image // The WIM's images.
+}
+
+// Image represents an image within a WIM file.
+type Image struct {
+	wim        *Reader
+	offset     resourceDescriptor
+	sds        [][]byte
+	rootOffset int64
+	r          io.ReadCloser
+	curOffset  int64
+	m          sync.Mutex
+
+	ImageInfo
+}
+
+// StreamHeader contains alternate data stream metadata.
+type StreamHeader struct {
+	Name string
+	Hash SHA1Hash
+	Size int64
+}
+
+// Stream represents an alternate data stream or reparse point data stream.
+type Stream struct {
+	StreamHeader
+	wim    *Reader
+	offset resourceDescriptor
+}
+
+// FileHeader contains file metadata.
+type FileHeader struct {
+	Name               string
+	ShortName          string
+	Attributes         uint32
+	SecurityDescriptor []byte
+	CreationTime       Filetime
+	LastAccessTime     Filetime
+	LastWriteTime      Filetime
+	Hash               SHA1Hash
+	Size               int64
+	LinkID             int64
+	ReparseTag         uint32
+	ReparseReserved    uint32
+}
+
+// File represents a file or directory in a WIM image.
+type File struct {
+	FileHeader
+	Streams      []*Stream
+	offset       resourceDescriptor
+	img          *Image
+	subdirOffset int64
+}
+
+// NewReader returns a Reader that can be used to read WIM file data.
+func NewReader(f io.ReaderAt) (*Reader, error) {
+	r := &Reader{r: f}
+	section := io.NewSectionReader(f, 0, 0xffff)
+	err := binary.Read(section, binary.LittleEndian, &r.hdr)
+	if err != nil {
+		return nil, err
+	}
+
+	if r.hdr.ImageTag != wimImageTag {
+		return nil, &ParseError{Oper: "image tag", Err: errors.New("not a WIM file")}
+	}
+
+	if r.hdr.Flags&^supportedHdrFlags != 0 {
+		return nil, fmt.Errorf("unsupported WIM flags %x", r.hdr.Flags&^supportedHdrFlags)
+	}
+
+	if r.hdr.CompressionSize != 0x8000 {
+		return nil, fmt.Errorf("unsupported compression size %d", r.hdr.CompressionSize)
+	}
+
+	if r.hdr.TotalParts != 1 {
+		return nil, errors.New("multi-part WIM not supported")
+	}
+
+	fileData, images, err := r.readOffsetTable(&r.hdr.OffsetTable)
+	if err != nil {
+		return nil, err
+	}
+
+	xmlinfo, err := r.readXML()
+	if err != nil {
+		return nil, err
+	}
+
+	var info info
+	err = xml.Unmarshal([]byte(xmlinfo), &info)
+	if err != nil {
+		return nil, &ParseError{Oper: "XML info", Err: err}
+	}
+
+	for i, img := range images {
+		for _, imgInfo := range info.Image {
+			if imgInfo.Index == i+1 {
+				img.ImageInfo = imgInfo
+				break
+			}
+		}
+	}
+
+	r.fileData = fileData
+	r.Image = images
+	r.XMLInfo = xmlinfo
+	return r, nil
+}
+
+// Close releases resources associated with the Reader.
+func (r *Reader) Close() error {
+	for _, img := range r.Image {
+		img.reset()
+	}
+	return nil
+}
+
+func (r *Reader) resourceReader(hdr *resourceDescriptor) (io.ReadCloser, error) {
+	return r.resourceReaderWithOffset(hdr, 0)
+}
+
+func (r *Reader) resourceReaderWithOffset(hdr *resourceDescriptor, offset int64) (io.ReadCloser, error) {
+	var sr io.ReadCloser
+	section := io.NewSectionReader(r.r, hdr.Offset, hdr.CompressedSize())
+	if hdr.Flags()&resFlagCompressed == 0 {
+		section.Seek(offset, 0)
+		sr = ioutil.NopCloser(section)
+	} else {
+		cr, err := newCompressedReader(section, hdr.OriginalSize, offset)
+		if err != nil {
+			return nil, err
+		}
+		sr = cr
+	}
+
+	return sr, nil
+}
+
+func (r *Reader) readResource(hdr *resourceDescriptor) ([]byte, error) {
+	rsrc, err := r.resourceReader(hdr)
+	if err != nil {
+		return nil, err
+	}
+	defer rsrc.Close()
+	return ioutil.ReadAll(rsrc)
+}
+
+func (r *Reader) readXML() (string, error) {
+	if r.hdr.XMLData.CompressedSize() == 0 {
+		return "", nil
+	}
+	rsrc, err := r.resourceReader(&r.hdr.XMLData)
+	if err != nil {
+		return "", err
+	}
+	defer rsrc.Close()
+
+	XMLData := make([]uint16, r.hdr.XMLData.OriginalSize/2)
+	err = binary.Read(rsrc, binary.LittleEndian, XMLData)
+	if err != nil {
+		return "", &ParseError{Oper: "XML data", Err: err}
+	}
+
+	// The BOM will always indicate little-endian UTF-16.
+	if XMLData[0] != 0xfeff {
+		return "", &ParseError{Oper: "XML data", Err: errors.New("invalid BOM")}
+	}
+	return string(utf16.Decode(XMLData[1:])), nil
+}
+
+func (r *Reader) readOffsetTable(res *resourceDescriptor) (map[SHA1Hash]resourceDescriptor, []*Image, error) {
+	fileData := make(map[SHA1Hash]resourceDescriptor)
+	var images []*Image
+
+	offsetTable, err := r.readResource(res)
+	if err != nil {
+		return nil, nil, &ParseError{Oper: "offset table", Err: err}
+	}
+
+	br := bytes.NewReader(offsetTable)
+	for i := 0; ; i++ {
+		var res streamDescriptor
+		err := binary.Read(br, binary.LittleEndian, &res)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return nil, nil, &ParseError{Oper: "offset table", Err: err}
+		}
+		if res.Flags()&^supportedResFlags != 0 {
+			return nil, nil, &ParseError{Oper: "offset table", Err: errors.New("unsupported resource flag")}
+		}
+
+		// Validation for ad-hoc testing
+		if validate {
+			sec, err := r.resourceReader(&res.resourceDescriptor)
+			if err != nil {
+				panic(fmt.Sprint(i, err))
+			}
+			hash := sha1.New()
+			_, err = io.Copy(hash, sec)
+			sec.Close()
+			if err != nil {
+				panic(fmt.Sprint(i, err))
+			}
+			var cmphash SHA1Hash
+			copy(cmphash[:], hash.Sum(nil))
+			if cmphash != res.Hash {
+				panic(fmt.Sprint(i, "hash mismatch"))
+			}
+		}
+
+		if res.Flags()&resFlagMetadata != 0 {
+			image := &Image{
+				wim:    r,
+				offset: res.resourceDescriptor,
+			}
+			images = append(images, image)
+		} else {
+			fileData[res.Hash] = res.resourceDescriptor
+		}
+	}
+
+	if len(images) != int(r.hdr.ImageCount) {
+		return nil, nil, &ParseError{Oper: "offset table", Err: errors.New("mismatched image count")}
+	}
+
+	return fileData, images, nil
+}
+
+func (r *Reader) readSecurityDescriptors(rsrc io.Reader) (sds [][]byte, n int64, err error) {
+	var secBlock securityblockDisk
+	err = binary.Read(rsrc, binary.LittleEndian, &secBlock)
+	if err != nil {
+		err = &ParseError{Oper: "security table", Err: err}
+		return
+	}
+
+	n += securityblockDiskSize
+
+	secSizes := make([]int64, secBlock.NumEntries)
+	err = binary.Read(rsrc, binary.LittleEndian, &secSizes)
+	if err != nil {
+		err = &ParseError{Oper: "security table sizes", Err: err}
+		return
+	}
+
+	n += int64(secBlock.NumEntries * 8)
+
+	sds = make([][]byte, secBlock.NumEntries)
+	for i, size := range secSizes {
+		sd := make([]byte, size&0xffffffff)
+		_, err = io.ReadFull(rsrc, sd)
+		if err != nil {
+			err = &ParseError{Oper: "security descriptor", Err: err}
+			return
+		}
+		n += int64(len(sd))
+		sds[i] = sd
+	}
+
+	secsize := int64((secBlock.TotalLength + 7) &^ 7)
+	if n > secsize {
+		err = &ParseError{Oper: "security descriptor", Err: errors.New("security descriptor table too small")}
+		return
+	}
+
+	_, err = io.CopyN(ioutil.Discard, rsrc, secsize-n)
+	if err != nil {
+		return
+	}
+
+	n = secsize
+	return
+}
+
+// Open parses the image and returns the root directory.
+func (img *Image) Open() (*File, error) {
+	if img.sds == nil {
+		rsrc, err := img.wim.resourceReaderWithOffset(&img.offset, img.rootOffset)
+		if err != nil {
+			return nil, err
+		}
+		sds, n, err := img.wim.readSecurityDescriptors(rsrc)
+		if err != nil {
+			rsrc.Close()
+			return nil, err
+		}
+		img.sds = sds
+		img.r = rsrc
+		img.rootOffset = n
+		img.curOffset = n
+	}
+
+	f, err := img.readdir(img.rootOffset)
+	if err != nil {
+		return nil, err
+	}
+	if len(f) != 1 {
+		return nil, &ParseError{Oper: "root directory", Err: errors.New("expected exactly 1 root directory entry")}
+	}
+	return f[0], err
+}
+
+func (img *Image) reset() {
+	if img.r != nil {
+		img.r.Close()
+		img.r = nil
+	}
+	img.curOffset = -1
+}
+
+func (img *Image) readdir(offset int64) ([]*File, error) {
+	img.m.Lock()
+	defer img.m.Unlock()
+
+	if offset < img.curOffset || offset > img.curOffset+chunkSize {
+		// Reset to seek backward or to seek forward very far.
+		img.reset()
+	}
+	if img.r == nil {
+		rsrc, err := img.wim.resourceReaderWithOffset(&img.offset, offset)
+		if err != nil {
+			return nil, err
+		}
+		img.r = rsrc
+		img.curOffset = offset
+	}
+	if offset > img.curOffset {
+		_, err := io.CopyN(ioutil.Discard, img.r, offset-img.curOffset)
+		if err != nil {
+			img.reset()
+			if err == io.EOF {
+				err = io.ErrUnexpectedEOF
+			}
+			return nil, err
+		}
+	}
+
+	var entries []*File
+	for {
+		e, n, err := img.readNextEntry(img.r)
+		img.curOffset += n
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			img.reset()
+			return nil, err
+		}
+		entries = append(entries, e)
+	}
+	return entries, nil
+}
+
+func (img *Image) readNextEntry(r io.Reader) (*File, int64, error) {
+	var length int64
+	err := binary.Read(r, binary.LittleEndian, &length)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "directory length check", Err: err}
+	}
+
+	if length == 0 {
+		return nil, 8, io.EOF
+	}
+
+	left := length
+	if left < direntrySize {
+		return nil, 0, &ParseError{Oper: "directory entry", Err: errors.New("size too short")}
+	}
+
+	var dentry direntry
+	err = binary.Read(r, binary.LittleEndian, &dentry)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "directory entry", Err: err}
+	}
+
+	left -= direntrySize
+
+	namesLen := int64(dentry.FileNameLength + 2 + dentry.ShortNameLength)
+	if left < namesLen {
+		return nil, 0, &ParseError{Oper: "directory entry", Err: errors.New("size too short for names")}
+	}
+
+	names := make([]uint16, namesLen/2)
+	err = binary.Read(r, binary.LittleEndian, names)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "file name", Err: err}
+	}
+
+	left -= namesLen
+
+	var name, shortName string
+	if dentry.FileNameLength > 0 {
+		name = string(utf16.Decode(names[:dentry.FileNameLength/2]))
+	}
+
+	if dentry.ShortNameLength > 0 {
+		shortName = string(utf16.Decode(names[dentry.FileNameLength/2+1:]))
+	}
+
+	var offset resourceDescriptor
+	zerohash := SHA1Hash{}
+	if dentry.Hash != zerohash {
+		var ok bool
+		offset, ok = img.wim.fileData[dentry.Hash]
+		if !ok {
+			return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: fmt.Errorf("could not find file data matching hash %#v", dentry)}
+		}
+	}
+
+	f := &File{
+		FileHeader: FileHeader{
+			Attributes:     dentry.Attributes,
+			CreationTime:   dentry.CreationTime,
+			LastAccessTime: dentry.LastAccessTime,
+			LastWriteTime:  dentry.LastWriteTime,
+			Hash:           dentry.Hash,
+			Size:           offset.OriginalSize,
+			Name:           name,
+			ShortName:      shortName,
+		},
+
+		offset:       offset,
+		img:          img,
+		subdirOffset: dentry.SubdirOffset,
+	}
+
+	isDir := false
+
+	if dentry.Attributes&FILE_ATTRIBUTE_REPARSE_POINT == 0 {
+		f.LinkID = dentry.ReparseHardLink
+		if dentry.Attributes&FILE_ATTRIBUTE_DIRECTORY != 0 {
+			isDir = true
+		}
+	} else {
+		f.ReparseTag = uint32(dentry.ReparseHardLink)
+		f.ReparseReserved = uint32(dentry.ReparseHardLink >> 32)
+	}
+
+	if isDir && f.subdirOffset == 0 {
+		return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: errors.New("no subdirectory data for directory")}
+	} else if !isDir && f.subdirOffset != 0 {
+		return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: errors.New("unexpected subdirectory data for non-directory")}
+	}
+
+	if dentry.SecurityID != 0xffffffff {
+		f.SecurityDescriptor = img.sds[dentry.SecurityID]
+	}
+
+	_, err = io.CopyN(ioutil.Discard, r, left)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, 0, err
+	}
+
+	if dentry.StreamCount > 0 {
+		var streams []*Stream
+		for i := uint16(0); i < dentry.StreamCount; i++ {
+			s, n, err := img.readNextStream(r)
+			length += n
+			if err != nil {
+				return nil, 0, err
+			}
+			// The first unnamed stream should be treated as the file stream.
+			if i == 0 && s.Name == "" {
+				f.Hash = s.Hash
+				f.Size = s.Size
+				f.offset = s.offset
+			} else if s.Name != "" {
+				streams = append(streams, s)
+			}
+		}
+		f.Streams = streams
+	}
+
+	if dentry.Attributes&FILE_ATTRIBUTE_REPARSE_POINT != 0 && f.Size == 0 {
+		return nil, 0, &ParseError{Oper: "directory entry", Path: name, Err: errors.New("reparse point is missing reparse stream")}
+	}
+
+	return f, length, nil
+}
+
+func (img *Image) readNextStream(r io.Reader) (*Stream, int64, error) {
+	var length int64
+	err := binary.Read(r, binary.LittleEndian, &length)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, 0, &ParseError{Oper: "stream length check", Err: err}
+	}
+
+	left := length
+	if left < streamentrySize {
+		return nil, 0, &ParseError{Oper: "stream entry", Err: errors.New("size too short")}
+	}
+
+	var sentry streamentry
+	err = binary.Read(r, binary.LittleEndian, &sentry)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "stream entry", Err: err}
+	}
+
+	left -= streamentrySize
+
+	if left < int64(sentry.NameLength) {
+		return nil, 0, &ParseError{Oper: "stream entry", Err: errors.New("size too short for name")}
+	}
+
+	names := make([]uint16, sentry.NameLength/2)
+	err = binary.Read(r, binary.LittleEndian, names)
+	if err != nil {
+		return nil, 0, &ParseError{Oper: "file name", Err: err}
+	}
+
+	left -= int64(sentry.NameLength)
+	name := string(utf16.Decode(names))
+
+	var offset resourceDescriptor
+	if sentry.Hash != (SHA1Hash{}) {
+		var ok bool
+		offset, ok = img.wim.fileData[sentry.Hash]
+		if !ok {
+			return nil, 0, &ParseError{Oper: "stream entry", Path: name, Err: fmt.Errorf("could not find file data matching hash %v", sentry.Hash)}
+		}
+	}
+
+	s := &Stream{
+		StreamHeader: StreamHeader{
+			Hash: sentry.Hash,
+			Size: offset.OriginalSize,
+			Name: name,
+		},
+		wim:    img.wim,
+		offset: offset,
+	}
+
+	_, err = io.CopyN(ioutil.Discard, r, left)
+	if err != nil {
+		if err == io.EOF {
+			err = io.ErrUnexpectedEOF
+		}
+		return nil, 0, err
+	}
+
+	return s, length, nil
+}
+
+// Open returns an io.ReadCloser that can be used to read the stream's contents.
+func (s *Stream) Open() (io.ReadCloser, error) {
+	return s.wim.resourceReader(&s.offset)
+}
+
+// Open returns an io.ReadCloser that can be used to read the file's contents.
+func (f *File) Open() (io.ReadCloser, error) {
+	return f.img.wim.resourceReader(&f.offset)
+}
+
+// Readdir reads the directory entries.
+func (f *File) Readdir() ([]*File, error) {
+	if !f.IsDir() {
+		return nil, errors.New("not a directory")
+	}
+	return f.img.readdir(f.subdirOffset)
+}
+
+// IsDir returns whether the given file is a directory. It returns false when it
+// is a directory reparse point.
+func (f *FileHeader) IsDir() bool {
+	return f.Attributes&(FILE_ATTRIBUTE_DIRECTORY|FILE_ATTRIBUTE_REPARSE_POINT) == FILE_ATTRIBUTE_DIRECTORY
+}

vendor/github.com/containerd/continuity/cmd/continuity/main.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	_ "crypto/sha256"
+
+	"github.com/containerd/continuity/commands"
+)
+
+func main() {
+	commands.MainCmd.Execute()
+}

vendor/github.com/containerd/continuity/commands/apply.go

@@ -0,0 +1,36 @@
+package commands
+
+import (
+	"io/ioutil"
+	"log"
+
+	"github.com/containerd/continuity"
+	"github.com/spf13/cobra"
+)
+
+var ApplyCmd = &cobra.Command{
+	Use:   "apply <root> [<manifest>]",
+	Short: "Apply the manifest to the provided root",
+	Run: func(cmd *cobra.Command, args []string) {
+		root, path := args[0], args[1]
+
+		p, err := ioutil.ReadFile(path)
+		if err != nil {
+			log.Fatalf("error reading manifest: %v", err)
+		}
+
+		m, err := continuity.Unmarshal(p)
+		if err != nil {
+			log.Fatalf("error unmarshaling manifest: %v", err)
+		}
+
+		ctx, err := continuity.NewContext(root)
+		if err != nil {
+			log.Fatalf("error getting context: %v", err)
+		}
+
+		if err := continuity.ApplyManifest(ctx, m); err != nil {
+			log.Fatalf("error applying manifest: %v", err)
+		}
+	},
+}

vendor/github.com/containerd/continuity/commands/build.go

@@ -0,0 +1,48 @@
+package commands
+
+import (
+	"log"
+	"os"
+
+	"github.com/containerd/continuity"
+	"github.com/spf13/cobra"
+)
+
+var (
+	buildCmdConfig struct {
+		format string
+	}
+
+	BuildCmd = &cobra.Command{
+		Use:   "build <root>",
+		Short: "Build a manifest for the provided root",
+		Run: func(cmd *cobra.Command, args []string) {
+			if len(args) != 1 {
+				log.Fatalln("please specify a root")
+			}
+
+			ctx, err := continuity.NewContext(args[0])
+			if err != nil {
+				log.Fatalf("error creating path context: %v", err)
+			}
+
+			m, err := continuity.BuildManifest(ctx)
+			if err != nil {
+				log.Fatalf("error generating manifest: %v", err)
+			}
+
+			p, err := continuity.Marshal(m)
+			if err != nil {
+				log.Fatalf("error marshaling manifest: %v", err)
+			}
+
+			if _, err := os.Stdout.Write(p); err != nil {
+				log.Fatalf("error writing to stdout: %v", err)
+			}
+		},
+	}
+)
+
+func init() {
+	BuildCmd.Flags().StringVar(&buildCmdConfig.format, "format", "pb", "specify the output format of the manifest")
+}

vendor/github.com/containerd/continuity/commands/dump.go

@@ -0,0 +1,44 @@
+package commands
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+
+	pb "github.com/containerd/continuity/proto"
+	"github.com/golang/protobuf/proto"
+	"github.com/spf13/cobra"
+)
+
+var DumpCmd = &cobra.Command{
+	Use:   "dump <manifest>",
+	Short: "Dump the contents of the manifest in protobuf text format",
+	Run: func(cmd *cobra.Command, args []string) {
+		var p []byte
+		var err error
+
+		if len(args) < 1 {
+			p, err = ioutil.ReadAll(os.Stdin)
+			if err != nil {
+				log.Fatalf("error reading manifest: %v", err)
+			}
+		} else {
+			p, err = ioutil.ReadFile(args[0])
+			if err != nil {
+				log.Fatalf("error reading manifest: %v", err)
+			}
+		}
+
+		var bm pb.Manifest
+
+		if err := proto.Unmarshal(p, &bm); err != nil {
+			log.Fatalf("error unmarshaling manifest: %v", err)
+		}
+
+		// TODO(stevvooe): For now, just dump the text format. Turn this into
+		// nice text output later.
+		if err := proto.MarshalText(os.Stdout, &bm); err != nil {
+			log.Fatalf("error dumping manifest: %v", err)
+		}
+	},
+}

vendor/github.com/containerd/continuity/commands/ls.go

@@ -0,0 +1,41 @@
+package commands
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"text/tabwriter"
+
+	"github.com/dustin/go-humanize"
+	"github.com/spf13/cobra"
+)
+
+var LSCmd = &cobra.Command{
+	Use:   "ls <manifest>",
+	Short: "List the contents of the manifest.",
+	Run: func(cmd *cobra.Command, args []string) {
+		if len(args) != 1 {
+			log.Fatalln("please specify a manifest")
+		}
+
+		bm, err := readManifestFile(args[0])
+		if err != nil {
+			log.Fatalf("error reading manifest: %v", err)
+		}
+
+		w := tabwriter.NewWriter(os.Stdout, 0, 2, 2, ' ', 0)
+
+		for _, entry := range bm.Resource {
+			for _, path := range entry.Path {
+				if os.FileMode(entry.Mode)&os.ModeSymlink != 0 {
+					fmt.Fprintf(w, "%v\t%v\t%v\t%v\t%v -> %v\n", os.FileMode(entry.Mode), entry.User, entry.Group, humanize.Bytes(uint64(entry.Size)), path, entry.Target)
+				} else {
+					fmt.Fprintf(w, "%v\t%v\t%v\t%v\t%v\n", os.FileMode(entry.Mode), entry.User, entry.Group, humanize.Bytes(uint64(entry.Size)), path)
+				}
+
+			}
+		}
+
+		w.Flush()
+	},
+}

vendor/github.com/containerd/continuity/commands/main.go

@@ -0,0 +1,82 @@
+package commands
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"text/tabwriter"
+
+	pb "github.com/containerd/continuity/proto"
+	"github.com/golang/protobuf/proto"
+	"github.com/spf13/cobra"
+)
+
+var (
+	MainCmd = &cobra.Command{
+		Use:   "continuity <command>",
+		Short: "A transport-agnostic filesytem metadata tool.",
+	}
+
+	// usageTemplate is nearly identical to the default template without the
+	// automatic addition of flags. Instead, Command.Use is used unmodified.
+	usageTemplate = `Usage:{{if .Runnable}}
+  {{.UseLine}}{{end}}{{if .HasSubCommands}}
+  {{ .CommandPath}} [command]{{end}}{{if gt .Aliases 0}}
+
+Aliases:
+  {{.NameAndAliases}}
+{{end}}{{if .HasExample}}
+
+Examples:
+{{ .Example }}{{end}}{{ if .HasAvailableSubCommands}}
+
+Available Commands:{{range .Commands}}{{if .IsAvailableCommand}}
+  {{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasLocalFlags}}
+
+Flags:
+{{.LocalFlags.FlagUsages | trimRightSpace}}{{end}}{{ if .HasInheritedFlags}}
+
+Global Flags:
+{{.InheritedFlags.FlagUsages | trimRightSpace}}{{end}}{{if .HasHelpSubCommands}}
+
+Additional help topics:{{range .Commands}}{{if .IsHelpCommand}}
+  {{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{ if .HasSubCommands }}
+
+Use "{{.CommandPath}} [command] --help" for more information about a command.{{end}}
+`
+)
+
+func init() {
+	MainCmd.AddCommand(BuildCmd)
+	MainCmd.AddCommand(VerifyCmd)
+	MainCmd.AddCommand(ApplyCmd)
+	MainCmd.AddCommand(LSCmd)
+	MainCmd.AddCommand(StatsCmd)
+	MainCmd.AddCommand(DumpCmd)
+	if MountCmd != nil {
+		MainCmd.AddCommand(MountCmd)
+	}
+	MainCmd.SetUsageTemplate(usageTemplate)
+}
+
+// readManifestFile reads the manifest from the given path. This should
+// probably be provided by the continuity library.
+func readManifestFile(path string) (*pb.Manifest, error) {
+	p, err := ioutil.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var bm pb.Manifest
+
+	if err := proto.Unmarshal(p, &bm); err != nil {
+		return nil, err
+	}
+
+	return &bm, nil
+}
+
+// newTabwriter provides a common tabwriter with defaults.
+func newTabwriter(w io.Writer) *tabwriter.Writer {
+	return tabwriter.NewWriter(os.Stdout, 0, 2, 2, ' ', 0)
+}

vendor/github.com/containerd/continuity/commands/mount.go

@@ -0,0 +1,115 @@
+// +build linux darwin freebsd
+
+package commands
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+
+	"github.com/containerd/continuity"
+	"github.com/containerd/continuity/continuityfs"
+	"github.com/containerd/continuity/driver"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+var MountCmd = &cobra.Command{
+	Use:   "mount <mountpoint> [<manifest>] [<source directory>]",
+	Short: "Mount the manifest to the provided mountpoint using content from a source directory",
+	Run: func(cmd *cobra.Command, args []string) {
+		if len(args) != 3 {
+			log.Fatal("Must specify mountpoint, manifest, and source directory")
+		}
+		mountpoint := args[0]
+		manifest, source := args[1], args[2]
+
+		manifestName := filepath.Base(manifest)
+
+		p, err := ioutil.ReadFile(manifest)
+		if err != nil {
+			log.Fatalf("error reading manifest: %v", err)
+		}
+
+		m, err := continuity.Unmarshal(p)
+		if err != nil {
+			log.Fatalf("error unmarshaling manifest: %v", err)
+		}
+
+		driver, err := driver.NewSystemDriver()
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		provider := continuityfs.NewFSFileContentProvider(source, driver)
+
+		contfs, err := continuityfs.NewFSFromManifest(m, mountpoint, provider)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		c, err := fuse.Mount(
+			mountpoint,
+			fuse.ReadOnly(),
+			fuse.FSName(manifestName),
+			fuse.Subtype("continuity"),
+			// OSX Only options
+			fuse.LocalVolume(),
+			fuse.VolumeName("Continuity FileSystem"),
+		)
+		if err != nil {
+			logrus.Fatal(err)
+		}
+
+		<-c.Ready
+		if err := c.MountError; err != nil {
+			c.Close()
+			logrus.Fatal(err)
+		}
+
+		errChan := make(chan error, 1)
+		go func() {
+			// TODO: Create server directory to use context
+			err = fs.Serve(c, contfs)
+			if err != nil {
+				errChan <- err
+			}
+		}()
+
+		sigChan := make(chan os.Signal, 1)
+		signal.Notify(sigChan, os.Interrupt)
+		signal.Notify(sigChan, syscall.SIGTERM)
+
+		select {
+		case <-sigChan:
+			logrus.Infof("Shutting down")
+		case err = <-errChan:
+		}
+
+		go func() {
+			if err := c.Close(); err != nil {
+				logrus.Errorf("Unable to close connection %s", err)
+			}
+		}()
+
+		// Wait for any inprogress requests to be handled
+		time.Sleep(time.Second)
+
+		logrus.Infof("Attempting unmount")
+		if err := fuse.Unmount(mountpoint); err != nil {
+			logrus.Errorf("Error unmounting %s: %v", mountpoint, err)
+		}
+
+		// Handle server error
+		if err != nil {
+			logrus.Fatalf("Error serving fuse server: %v", err)
+		}
+	},
+}

vendor/github.com/containerd/continuity/commands/mount_unsupported.go

@@ -0,0 +1,9 @@
+// +build windows solaris
+
+package commands
+
+import (
+	"github.com/spf13/cobra"
+)
+
+var MountCmd *cobra.Command = nil

vendor/github.com/containerd/continuity/commands/stats.go

@@ -0,0 +1,58 @@
+package commands
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/dustin/go-humanize"
+	"github.com/spf13/cobra"
+)
+
+var (
+	StatsCmd = &cobra.Command{
+		Use:   "stats <manifest>",
+		Short: "display statistics about the specified manifest",
+		Run: func(cmd *cobra.Command, args []string) {
+			if len(args) != 1 {
+				log.Fatalln("please specify a manifest")
+			}
+
+			bm, err := readManifestFile(args[0])
+			if err != nil {
+				log.Fatalf("error reading manifest: %v", err)
+			}
+
+			var stats struct {
+				resources   int
+				files       int
+				directories int
+				totalSize   int64
+				symlinks    int
+			}
+
+			for _, entry := range bm.Resource {
+				stats.resources++
+				stats.totalSize += int64(entry.Size)
+
+				mode := os.FileMode(entry.Mode)
+				if mode.IsRegular() {
+					stats.files += len(entry.Path) // count hardlinks!
+				} else if mode.IsDir() {
+					stats.directories++
+				} else if mode&os.ModeSymlink != 0 {
+					stats.symlinks++
+				}
+			}
+
+			w := newTabwriter(os.Stdout)
+			defer w.Flush()
+
+			fmt.Fprintf(w, "resources\t%v\n", stats.resources)
+			fmt.Fprintf(w, "directories\t%v\n", stats.directories)
+			fmt.Fprintf(w, "files\t%v\n", stats.files)
+			fmt.Fprintf(w, "symlinks\t%v\n", stats.symlinks)
+			fmt.Fprintf(w, "size\t%v\n", humanize.Bytes(uint64(stats.totalSize)))
+		},
+	}
+)

vendor/github.com/containerd/continuity/commands/verify.go

@@ -0,0 +1,41 @@
+package commands
+
+import (
+	"io/ioutil"
+	"log"
+
+	"github.com/containerd/continuity"
+	"github.com/spf13/cobra"
+)
+
+var VerifyCmd = &cobra.Command{
+	Use:   "verify <root> [<manifest>]",
+	Short: "Verify the root against the provided manifest",
+	Run: func(cmd *cobra.Command, args []string) {
+		if len(args) != 2 {
+			log.Fatalln("please specify a root and manifest")
+		}
+
+		root, path := args[0], args[1]
+
+		p, err := ioutil.ReadFile(path)
+		if err != nil {
+			log.Fatalf("error reading manifest: %v", err)
+		}
+
+		m, err := continuity.Unmarshal(p)
+		if err != nil {
+			log.Fatalf("error unmarshaling manifest: %v", err)
+		}
+
+		ctx, err := continuity.NewContext(root)
+		if err != nil {
+			log.Fatalf("error getting context: %v", err)
+		}
+
+		if err := continuity.VerifyManifest(ctx, m); err != nil {
+			// TODO(stevvooe): Support more interesting error reporting.
+			log.Fatalf("error verifying manifest: %v", err)
+		}
+	},
+}

vendor/github.com/containerd/continuity/continuityfs/fuse.go

@@ -0,0 +1,306 @@
+// +build linux darwin freebsd
+
+package continuityfs
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"syscall"
+
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+	"github.com/containerd/continuity"
+	"github.com/opencontainers/go-digest"
+	"github.com/sirupsen/logrus"
+	"golang.org/x/net/context"
+)
+
+// File represents any file type (non directory) in the filesystem
+type File struct {
+	inode    uint64
+	uid      uint32
+	gid      uint32
+	provider FileContentProvider
+	resource continuity.Resource
+}
+
+// NewFile creates a new file with the given inode and content provider
+func NewFile(inode uint64, provider FileContentProvider) *File {
+	return &File{
+		inode:    inode,
+		provider: provider,
+	}
+}
+
+func (f *File) setResource(r continuity.Resource) (err error) {
+	// TODO: error out if uid excesses uint32?
+	f.uid = uint32(r.UID())
+	f.gid = uint32(r.GID())
+	f.resource = r
+
+	return
+}
+
+// Attr sets the fuse attribute for the file
+func (f *File) Attr(ctx context.Context, attr *fuse.Attr) (err error) {
+	// Set attributes from resource metadata
+	attr.Mode = f.resource.Mode()
+	attr.Uid = f.uid
+	attr.Gid = f.gid
+
+	if rf, ok := f.resource.(continuity.RegularFile); ok {
+		attr.Nlink = uint32(len(rf.Paths()))
+		attr.Size = uint64(rf.Size())
+	} else {
+		attr.Nlink = 1
+	}
+
+	attr.Inode = f.inode
+
+	return nil
+}
+
+// Open opens the file for read
+// currently only regular files can be opened
+func (f *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fs.Handle, error) {
+	var dgst digest.Digest
+	if rf, ok := f.resource.(continuity.RegularFile); ok {
+		digests := rf.Digests()
+		if len(digests) > 0 {
+			dgst = digests[0]
+		}
+	}
+	// TODO(dmcgowan): else check if device can be opened for read
+	r, err := f.provider.Open(f.resource.Path(), dgst)
+	if err != nil {
+		logrus.Debugf("Error opening handle: %v", err)
+		return nil, err
+	}
+	return &fileHandler{
+		reader: r,
+	}, nil
+
+}
+
+func (f *File) getDirent(name string) (fuse.Dirent, error) {
+	var t fuse.DirentType
+	switch f.resource.(type) {
+	case continuity.RegularFile:
+		t = fuse.DT_File
+	case continuity.SymLink:
+		t = fuse.DT_Link
+	case continuity.Device:
+		t = fuse.DT_Block
+	case continuity.NamedPipe:
+		t = fuse.DT_FIFO
+	default:
+		t = fuse.DT_Unknown
+	}
+
+	return fuse.Dirent{
+		Inode: f.inode,
+		Type:  t,
+		Name:  name,
+	}, nil
+}
+
+type fileHandler struct {
+	offset int64
+	reader io.ReadCloser
+}
+
+func (h *fileHandler) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
+	if h.offset != req.Offset {
+		if seeker, ok := h.reader.(io.Seeker); ok {
+			if _, err := seeker.Seek(req.Offset, os.SEEK_SET); err != nil {
+				logrus.Debugf("Error seeking: %v", err)
+				return err
+			}
+			h.offset = req.Offset
+		} else {
+			return errors.New("unable to seek to offset")
+		}
+	}
+
+	n, err := h.reader.Read(resp.Data[:req.Size])
+	if err != nil {
+		logrus.Debugf("Read error: %v", err)
+		return err
+	}
+	h.offset = h.offset + int64(n)
+
+	resp.Data = resp.Data[:n]
+
+	return nil
+}
+
+func (h *fileHandler) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
+	return h.reader.Close()
+}
+
+// Dir represents a file system directory
+type Dir struct {
+	inode    uint64
+	uid      uint32
+	gid      uint32
+	nodes    map[string]fs.Node
+	provider FileContentProvider
+	resource continuity.Resource
+}
+
+// Attr sets the fuse attributes for the directory
+func (d *Dir) Attr(ctx context.Context, attr *fuse.Attr) (err error) {
+	if d.resource == nil {
+		attr.Mode = os.ModeDir | 0555
+	} else {
+		attr.Mode = d.resource.Mode()
+	}
+
+	attr.Uid = d.uid
+	attr.Gid = d.gid
+	attr.Inode = d.inode
+
+	return nil
+}
+
+func (d *Dir) getDirent(name string) (fuse.Dirent, error) {
+	return fuse.Dirent{
+		Inode: d.inode,
+		Type:  fuse.DT_Dir,
+		Name:  name,
+	}, nil
+}
+
+type direnter interface {
+	getDirent(name string) (fuse.Dirent, error)
+}
+
+// Lookup looks up the filesystem node for the name within the directory
+func (d *Dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
+	node, ok := d.nodes[name]
+	if !ok {
+		return nil, fuse.ENOENT
+	}
+	return node, nil
+}
+
+// ReadDirAll reads all the directory entries
+func (d *Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
+	ents := make([]fuse.Dirent, 0, len(d.nodes))
+	for name, node := range d.nodes {
+		if nd, ok := node.(direnter); ok {
+			de, err := nd.getDirent(name)
+			if err != nil {
+				return nil, err
+			}
+			ents = append(ents, de)
+		} else {
+			logrus.Errorf("%s does not have a directory entry", name)
+		}
+	}
+
+	return ents, nil
+}
+
+func (d *Dir) setResource(r continuity.Resource) (err error) {
+	d.uid = uint32(r.UID())
+	d.gid = uint32(r.GID())
+	d.resource = r
+
+	return
+}
+
+// NewDir creates a new directory object
+func NewDir(inode uint64, provider FileContentProvider) *Dir {
+	return &Dir{
+		inode:    inode,
+		nodes:    map[string]fs.Node{},
+		provider: provider,
+	}
+}
+
+var (
+	rootPath = fmt.Sprintf("%c", filepath.Separator)
+)
+
+func addNode(path string, node fs.Node, cache map[string]*Dir, provider FileContentProvider) {
+	dirPath, file := filepath.Split(path)
+	d, ok := cache[dirPath]
+	if !ok {
+		d = NewDir(0, provider)
+		cache[dirPath] = d
+		addNode(filepath.Clean(dirPath), d, cache, provider)
+	}
+	d.nodes[file] = node
+	logrus.Debugf("%s (%#v) added to %s", file, node, dirPath)
+}
+
+type treeRoot struct {
+	root *Dir
+}
+
+func (t treeRoot) Root() (fs.Node, error) {
+	logrus.Debugf("Returning root with %#v", t.root.nodes)
+	return t.root, nil
+}
+
+// NewFSFromManifest creates a fuse filesystem using the given manifest
+// to create the node tree and the content provider to serve up
+// content for regular files.
+func NewFSFromManifest(manifest *continuity.Manifest, mountRoot string, provider FileContentProvider) (fs.FS, error) {
+	tree := treeRoot{
+		root: NewDir(0, provider),
+	}
+
+	fi, err := os.Stat(mountRoot)
+	if err != nil {
+		return nil, err
+	}
+	st, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return nil, errors.New("could not access directory")
+	}
+	tree.root.uid = st.Uid
+	tree.root.gid = st.Gid
+
+	dirCache := map[string]*Dir{
+		rootPath: tree.root,
+	}
+
+	for i, resource := range manifest.Resources {
+		inode := uint64(i) + 1
+		if _, ok := resource.(continuity.Directory); ok {
+			cleanPath := filepath.Clean(resource.Path())
+			keyPath := fmt.Sprintf("%s%c", cleanPath, filepath.Separator)
+			d, ok := dirCache[keyPath]
+			if !ok {
+				d = NewDir(inode, provider)
+				dirCache[keyPath] = d
+				addNode(cleanPath, d, dirCache, provider)
+			} else {
+				d.inode = inode
+			}
+			if err := d.setResource(resource); err != nil {
+				return nil, err
+			}
+			continue
+		}
+		f := NewFile(inode, provider)
+		if err := f.setResource(resource); err != nil {
+			return nil, err
+		}
+		if rf, ok := resource.(continuity.RegularFile); ok {
+
+			for _, p := range rf.Paths() {
+				addNode(p, f, dirCache, provider)
+			}
+		} else {
+			addNode(resource.Path(), f, dirCache, provider)
+		}
+	}
+
+	return tree, nil
+}

vendor/github.com/containerd/continuity/continuityfs/provider.go

@@ -0,0 +1,43 @@
+// +build linux darwin freebsd
+
+package continuityfs
+
+import (
+	"io"
+	"path/filepath"
+
+	"github.com/containerd/continuity/driver"
+	"github.com/opencontainers/go-digest"
+)
+
+// FileContentProvider is an object which is used to fetch
+// data and inode information about a path or digest.
+// TODO(dmcgowan): Update GetContentPath to provide a
+// filehandle or ReadWriteCloser.
+type FileContentProvider interface {
+	Path(string, digest.Digest) (string, error)
+	Open(string, digest.Digest) (io.ReadCloser, error)
+}
+
+type fsContentProvider struct {
+	root   string
+	driver driver.Driver
+}
+
+// NewFSFileContentProvider creates a new content provider which
+// gets content from a directory on an existing filesystem based
+// on the resource path.
+func NewFSFileContentProvider(root string, driver driver.Driver) FileContentProvider {
+	return &fsContentProvider{
+		root:   root,
+		driver: driver,
+	}
+}
+
+func (p *fsContentProvider) Path(path string, dgst digest.Digest) (string, error) {
+	return filepath.Join(p.root, path), nil
+}
+
+func (p *fsContentProvider) Open(path string, dgst digest.Digest) (io.ReadCloser, error) {
+	return p.driver.Open(filepath.Join(p.root, path))
+}

vendor/github.com/containerd/continuity/devices/devices.go

@@ -0,0 +1,5 @@
+package devices
+
+import "fmt"
+
+var ErrNotSupported = fmt.Errorf("not supported")

vendor/github.com/containerd/continuity/devices/devices_unix.go

@@ -0,0 +1,58 @@
+// +build linux darwin freebsd solaris
+
+package devices
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+func DeviceInfo(fi os.FileInfo) (uint64, uint64, error) {
+	sys, ok := fi.Sys().(*syscall.Stat_t)
+	if !ok {
+		return 0, 0, fmt.Errorf("cannot extract device from os.FileInfo")
+	}
+
+	dev := uint64(sys.Rdev)
+	return uint64(unix.Major(dev)), uint64(unix.Minor(dev)), nil
+}
+
+// mknod provides a shortcut for syscall.Mknod
+func Mknod(p string, mode os.FileMode, maj, min int) error {
+	var (
+		m   = syscallMode(mode.Perm())
+		dev uint64
+	)
+
+	if mode&os.ModeDevice != 0 {
+		dev = unix.Mkdev(uint32(maj), uint32(min))
+
+		if mode&os.ModeCharDevice != 0 {
+			m |= unix.S_IFCHR
+		} else {
+			m |= unix.S_IFBLK
+		}
+	} else if mode&os.ModeNamedPipe != 0 {
+		m |= unix.S_IFIFO
+	}
+
+	return unix.Mknod(p, m, int(dev))
+}
+
+// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
+func syscallMode(i os.FileMode) (o uint32) {
+	o |= uint32(i.Perm())
+	if i&os.ModeSetuid != 0 {
+		o |= unix.S_ISUID
+	}
+	if i&os.ModeSetgid != 0 {
+		o |= unix.S_ISGID
+	}
+	if i&os.ModeSticky != 0 {
+		o |= unix.S_ISVTX
+	}
+	return
+}

vendor/github.com/containerd/continuity/devices/devices_windows.go

@@ -0,0 +1,11 @@
+package devices
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+func DeviceInfo(fi os.FileInfo) (uint64, uint64, error) {
+	return 0, 0, errors.Wrap(ErrNotSupported, "cannot get device info on windows")
+}

vendor/github.com/containerd/continuity/driver/driver.go

@@ -0,0 +1,162 @@
+package driver
+
+import (
+	"fmt"
+	"io"
+	"os"
+)
+
+var ErrNotSupported = fmt.Errorf("not supported")
+
+// Driver provides all of the system-level functions in a common interface.
+// The context should call these with full paths and should never use the `os`
+// package or any other package to access resources on the filesystem. This
+// mechanism let's us carefully control access to the context and maintain
+// path and resource integrity. It also gives us an interface to reason about
+// direct resource access.
+//
+// Implementations don't need to do much other than meet the interface. For
+// example, it is not required to wrap os.FileInfo to return correct paths for
+// the call to Name().
+type Driver interface {
+	// Note that Open() returns a File interface instead of *os.File. This
+	// is because os.File is a struct, so if Open was to return *os.File,
+	// the only way to fulfill the interface would be to call os.Open()
+	Open(path string) (File, error)
+	OpenFile(path string, flag int, perm os.FileMode) (File, error)
+
+	Stat(path string) (os.FileInfo, error)
+	Lstat(path string) (os.FileInfo, error)
+	Readlink(p string) (string, error)
+	Mkdir(path string, mode os.FileMode) error
+	Remove(path string) error
+
+	Link(oldname, newname string) error
+	Lchmod(path string, mode os.FileMode) error
+	Lchown(path string, uid, gid int64) error
+	Symlink(oldname, newname string) error
+
+	MkdirAll(path string, perm os.FileMode) error
+	RemoveAll(path string) error
+
+	// TODO(aaronl): These methods might move outside the main Driver
+	// interface in the future as more platforms are added.
+	Mknod(path string, mode os.FileMode, major int, minor int) error
+	Mkfifo(path string, mode os.FileMode) error
+}
+
+// File is the interface for interacting with files returned by continuity's Open
+// This is needed since os.File is a struct, instead of an interface, so it can't
+// be used.
+type File interface {
+	io.ReadWriteCloser
+	io.Seeker
+	Readdir(n int) ([]os.FileInfo, error)
+}
+
+func NewSystemDriver() (Driver, error) {
+	// TODO(stevvooe): Consider having this take a "hint" path argument, which
+	// would be the context root. The hint could be used to resolve required
+	// filesystem support when assembling the driver to use.
+	return &driver{}, nil
+}
+
+// XAttrDriver should be implemented on operation systems and filesystems that
+// have xattr support for regular files and directories.
+type XAttrDriver interface {
+	// Getxattr returns all of the extended attributes for the file at path.
+	// Typically, this takes a syscall call to Listxattr and Getxattr.
+	Getxattr(path string) (map[string][]byte, error)
+
+	// Setxattr sets all of the extended attributes on file at path, following
+	// any symbolic links, if necessary. All attributes on the target are
+	// replaced by the values from attr. If the operation fails to set any
+	// attribute, those already applied will not be rolled back.
+	Setxattr(path string, attr map[string][]byte) error
+}
+
+// LXAttrDriver should be implemented by drivers on operating systems and
+// filesystems that support setting and getting extended attributes on
+// symbolic links. If this is not implemented, extended attributes will be
+// ignored on symbolic links.
+type LXAttrDriver interface {
+	// LGetxattr returns all of the extended attributes for the file at path
+	// and does not follow symlinks. Typically, this takes a syscall call to
+	// Llistxattr and Lgetxattr.
+	LGetxattr(path string) (map[string][]byte, error)
+
+	// LSetxattr sets all of the extended attributes on file at path, without
+	// following symbolic links. All attributes on the target are replaced by
+	// the values from attr. If the operation fails to set any attribute,
+	// those already applied will not be rolled back.
+	LSetxattr(path string, attr map[string][]byte) error
+}
+
+type DeviceInfoDriver interface {
+	DeviceInfo(fi os.FileInfo) (maj uint64, min uint64, err error)
+}
+
+// driver is a simple default implementation that sends calls out to the "os"
+// package. Extend the "driver" type in system-specific files to add support,
+// such as xattrs, which can add support at compile time.
+type driver struct{}
+
+var _ File = &os.File{}
+
+// LocalDriver is the exported Driver struct for convenience.
+var LocalDriver Driver = &driver{}
+
+func (d *driver) Open(p string) (File, error) {
+	return os.Open(p)
+}
+
+func (d *driver) OpenFile(path string, flag int, perm os.FileMode) (File, error) {
+	return os.OpenFile(path, flag, perm)
+}
+
+func (d *driver) Stat(p string) (os.FileInfo, error) {
+	return os.Stat(p)
+}
+
+func (d *driver) Lstat(p string) (os.FileInfo, error) {
+	return os.Lstat(p)
+}
+
+func (d *driver) Readlink(p string) (string, error) {
+	return os.Readlink(p)
+}
+
+func (d *driver) Mkdir(p string, mode os.FileMode) error {
+	return os.Mkdir(p, mode)
+}
+
+// Remove is used to unlink files and remove directories.
+// This is following the golang os package api which
+// combines the operations into a higher level Remove
+// function. If explicit unlinking or directory removal
+// to mirror system call is required, they should be
+// split up at that time.
+func (d *driver) Remove(path string) error {
+	return os.Remove(path)
+}
+
+func (d *driver) Link(oldname, newname string) error {
+	return os.Link(oldname, newname)
+}
+
+func (d *driver) Lchown(name string, uid, gid int64) error {
+	// TODO: error out if uid excesses int bit width?
+	return os.Lchown(name, int(uid), int(gid))
+}
+
+func (d *driver) Symlink(oldname, newname string) error {
+	return os.Symlink(oldname, newname)
+}
+
+func (d *driver) MkdirAll(path string, perm os.FileMode) error {
+	return os.MkdirAll(path, perm)
+}
+
+func (d *driver) RemoveAll(path string) error {
+	return os.RemoveAll(path)
+}

vendor/github.com/containerd/continuity/driver/driver_unix.go

@@ -0,0 +1,122 @@
+// +build linux darwin freebsd solaris
+
+package driver
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+
+	"github.com/containerd/continuity/devices"
+	"github.com/containerd/continuity/sysx"
+)
+
+func (d *driver) Mknod(path string, mode os.FileMode, major, minor int) error {
+	return devices.Mknod(path, mode, major, minor)
+}
+
+func (d *driver) Mkfifo(path string, mode os.FileMode) error {
+	if mode&os.ModeNamedPipe == 0 {
+		return errors.New("mode passed to Mkfifo does not have the named pipe bit set")
+	}
+	// mknod with a mode that has ModeNamedPipe set creates a fifo, not a
+	// device.
+	return devices.Mknod(path, mode, 0, 0)
+}
+
+// Lchmod changes the mode of an file not following symlinks.
+func (d *driver) Lchmod(path string, mode os.FileMode) (err error) {
+	if !filepath.IsAbs(path) {
+		path, err = filepath.Abs(path)
+		if err != nil {
+			return
+		}
+	}
+
+	return sysx.Fchmodat(0, path, uint32(mode), sysx.AtSymlinkNofollow)
+}
+
+// Getxattr returns all of the extended attributes for the file at path p.
+func (d *driver) Getxattr(p string) (map[string][]byte, error) {
+	xattrs, err := sysx.Listxattr(p)
+	if err != nil {
+		return nil, fmt.Errorf("listing %s xattrs: %v", p, err)
+	}
+
+	sort.Strings(xattrs)
+	m := make(map[string][]byte, len(xattrs))
+
+	for _, attr := range xattrs {
+		value, err := sysx.Getxattr(p, attr)
+		if err != nil {
+			return nil, fmt.Errorf("getting %q xattr on %s: %v", attr, p, err)
+		}
+
+		// NOTE(stevvooe): This append/copy tricky relies on unique
+		// xattrs. Break this out into an alloc/copy if xattrs are no
+		// longer unique.
+		m[attr] = append(m[attr], value...)
+	}
+
+	return m, nil
+}
+
+// Setxattr sets all of the extended attributes on file at path, following
+// any symbolic links, if necessary. All attributes on the target are
+// replaced by the values from attr. If the operation fails to set any
+// attribute, those already applied will not be rolled back.
+func (d *driver) Setxattr(path string, attrMap map[string][]byte) error {
+	for attr, value := range attrMap {
+		if err := sysx.Setxattr(path, attr, value, 0); err != nil {
+			return fmt.Errorf("error setting xattr %q on %s: %v", attr, path, err)
+		}
+	}
+
+	return nil
+}
+
+// LGetxattr returns all of the extended attributes for the file at path p
+// not following symbolic links.
+func (d *driver) LGetxattr(p string) (map[string][]byte, error) {
+	xattrs, err := sysx.LListxattr(p)
+	if err != nil {
+		return nil, fmt.Errorf("listing %s xattrs: %v", p, err)
+	}
+
+	sort.Strings(xattrs)
+	m := make(map[string][]byte, len(xattrs))
+
+	for _, attr := range xattrs {
+		value, err := sysx.LGetxattr(p, attr)
+		if err != nil {
+			return nil, fmt.Errorf("getting %q xattr on %s: %v", attr, p, err)
+		}
+
+		// NOTE(stevvooe): This append/copy tricky relies on unique
+		// xattrs. Break this out into an alloc/copy if xattrs are no
+		// longer unique.
+		m[attr] = append(m[attr], value...)
+	}
+
+	return m, nil
+}
+
+// LSetxattr sets all of the extended attributes on file at path, not
+// following any symbolic links. All attributes on the target are
+// replaced by the values from attr. If the operation fails to set any
+// attribute, those already applied will not be rolled back.
+func (d *driver) LSetxattr(path string, attrMap map[string][]byte) error {
+	for attr, value := range attrMap {
+		if err := sysx.LSetxattr(path, attr, value, 0); err != nil {
+			return fmt.Errorf("error setting xattr %q on %s: %v", attr, path, err)
+		}
+	}
+
+	return nil
+}
+
+func (d *driver) DeviceInfo(fi os.FileInfo) (maj uint64, min uint64, err error) {
+	return devices.DeviceInfo(fi)
+}

vendor/github.com/containerd/continuity/driver/driver_windows.go

@@ -0,0 +1,21 @@
+package driver
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+func (d *driver) Mknod(path string, mode os.FileMode, major, minor int) error {
+	return errors.Wrap(ErrNotSupported, "cannot create device node on Windows")
+}
+
+func (d *driver) Mkfifo(path string, mode os.FileMode) error {
+	return errors.Wrap(ErrNotSupported, "cannot create fifo on Windows")
+}
+
+// Lchmod changes the mode of an file not following symlinks.
+func (d *driver) Lchmod(path string, mode os.FileMode) (err error) {
+	// TODO: Use Window's equivalent
+	return os.Chmod(path, mode)
+}

vendor/github.com/containerd/continuity/driver/utils.go

@@ -0,0 +1,74 @@
+package driver
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"sort"
+)
+
+// ReadFile works the same as ioutil.ReadFile with the Driver abstraction
+func ReadFile(r Driver, filename string) ([]byte, error) {
+	f, err := r.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	data, err := ioutil.ReadAll(f)
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+// WriteFile works the same as ioutil.WriteFile with the Driver abstraction
+func WriteFile(r Driver, filename string, data []byte, perm os.FileMode) error {
+	f, err := r.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	n, err := f.Write(data)
+	if err != nil {
+		return err
+	} else if n != len(data) {
+		return io.ErrShortWrite
+	}
+
+	return nil
+}
+
+// ReadDir works the same as ioutil.ReadDir with the Driver abstraction
+func ReadDir(r Driver, dirname string) ([]os.FileInfo, error) {
+	f, err := r.Open(dirname)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+
+	dirs, err := f.Readdir(-1)
+	if err != nil {
+		return nil, err
+	}
+
+	sort.Sort(fileInfos(dirs))
+	return dirs, nil
+}
+
+// Simple implementation of the sort.Interface for os.FileInfo
+type fileInfos []os.FileInfo
+
+func (fis fileInfos) Len() int {
+	return len(fis)
+}
+
+func (fis fileInfos) Less(i, j int) bool {
+	return fis[i].Name() < fis[j].Name()
+}
+
+func (fis fileInfos) Swap(i, j int) {
+	fis[i], fis[j] = fis[j], fis[i]
+}

vendor/github.com/containerd/continuity/proto/gen.go

@@ -0,0 +1,3 @@
+package proto
+
+//go:generate protoc --go_out=. manifest.proto

vendor/github.com/containerd/continuity/proto/manifest.pb.go

@@ -0,0 +1,181 @@
+// Code generated by protoc-gen-go.
+// source: manifest.proto
+// DO NOT EDIT!
+
+/*
+Package proto is a generated protocol buffer package.
+
+It is generated from these files:
+	manifest.proto
+
+It has these top-level messages:
+	Manifest
+	Resource
+	XAttr
+	ADSEntry
+*/
+package proto
+
+import proto1 "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto1.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto1.ProtoPackageIsVersion2 // please upgrade the proto package
+
+// Manifest specifies the entries in a container bundle, keyed and sorted by
+// path.
+type Manifest struct {
+	Resource []*Resource `protobuf:"bytes,1,rep,name=resource" json:"resource,omitempty"`
+}
+
+func (m *Manifest) Reset()                    { *m = Manifest{} }
+func (m *Manifest) String() string            { return proto1.CompactTextString(m) }
+func (*Manifest) ProtoMessage()               {}
+func (*Manifest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
+
+func (m *Manifest) GetResource() []*Resource {
+	if m != nil {
+		return m.Resource
+	}
+	return nil
+}
+
+type Resource struct {
+	// Path specifies the path from the bundle root. If more than one
+	// path is present, the entry may represent a hardlink, rather than using
+	// a link target. The path format is operating system specific.
+	Path []string `protobuf:"bytes,1,rep,name=path" json:"path,omitempty"`
+	// Uid specifies the user id for the resource.
+	Uid int64 `protobuf:"varint,2,opt,name=uid" json:"uid,omitempty"`
+	// Gid specifies the group id for the resource.
+	Gid int64 `protobuf:"varint,3,opt,name=gid" json:"gid,omitempty"`
+	// user and group are not currently used but their field numbers have been
+	// reserved for future use. As such, they are marked as deprecated.
+	User  string `protobuf:"bytes,4,opt,name=user" json:"user,omitempty"`
+	Group string `protobuf:"bytes,5,opt,name=group" json:"group,omitempty"`
+	// Mode defines the file mode and permissions. We've used the same
+	// bit-packing from Go's os package,
+	// http://golang.org/pkg/os/#FileMode, since they've done the work of
+	// creating a cross-platform layout.
+	Mode uint32 `protobuf:"varint,6,opt,name=mode" json:"mode,omitempty"`
+	// Size specifies the size in bytes of the resource. This is only valid
+	// for regular files.
+	Size uint64 `protobuf:"varint,7,opt,name=size" json:"size,omitempty"`
+	// Digest specifies the content digest of the target file. Only valid for
+	// regular files. The strings are formatted in OCI style, i.e. <alg>:<encoded>.
+	// For detailed information about the format, please refer to OCI Image Spec:
+	// https://github.com/opencontainers/image-spec/blob/master/descriptor.md#digests-and-verification
+	// The digests are sorted in lexical order and implementations may choose
+	// which algorithms they prefer.
+	Digest []string `protobuf:"bytes,8,rep,name=digest" json:"digest,omitempty"`
+	// Target defines the target of a hard or soft link. Absolute links start
+	// with a slash and specify the resource relative to the bundle root.
+	// Relative links do not start with a slash and are relative to the
+	// resource path.
+	Target string `protobuf:"bytes,9,opt,name=target" json:"target,omitempty"`
+	// Major specifies the major device number for character and block devices.
+	Major uint64 `protobuf:"varint,10,opt,name=major" json:"major,omitempty"`
+	// Minor specifies the minor device number for character and block devices.
+	Minor uint64 `protobuf:"varint,11,opt,name=minor" json:"minor,omitempty"`
+	// Xattr provides storage for extended attributes for the target resource.
+	Xattr []*XAttr `protobuf:"bytes,12,rep,name=xattr" json:"xattr,omitempty"`
+	// Ads stores one or more alternate data streams for the target resource.
+	Ads []*ADSEntry `protobuf:"bytes,13,rep,name=ads" json:"ads,omitempty"`
+}
+
+func (m *Resource) Reset()                    { *m = Resource{} }
+func (m *Resource) String() string            { return proto1.CompactTextString(m) }
+func (*Resource) ProtoMessage()               {}
+func (*Resource) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{1} }
+
+func (m *Resource) GetXattr() []*XAttr {
+	if m != nil {
+		return m.Xattr
+	}
+	return nil
+}
+
+func (m *Resource) GetAds() []*ADSEntry {
+	if m != nil {
+		return m.Ads
+	}
+	return nil
+}
+
+// XAttr encodes extended attributes for a resource.
+type XAttr struct {
+	// Name specifies the attribute name.
+	Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// Data specifies the associated data for the attribute.
+	Data []byte `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (m *XAttr) Reset()                    { *m = XAttr{} }
+func (m *XAttr) String() string            { return proto1.CompactTextString(m) }
+func (*XAttr) ProtoMessage()               {}
+func (*XAttr) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{2} }
+
+// ADSEntry encodes information for a Windows Alternate Data Stream.
+type ADSEntry struct {
+	// Name specifices the stream name.
+	Name string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// Data specifies the stream data.
+	// See also the description about the digest below.
+	Data []byte `protobuf:"bytes,2,opt,name=data,proto3" json:"data,omitempty"`
+	// Digest is a CAS representation of the stream data.
+	//
+	// At least one of data or digest MUST be specified, and either one of them
+	// SHOULD be specified.
+	//
+	// How to access the actual data using the digest is implementation-specific,
+	// and implementations can choose not to implement digest.
+	// So, digest SHOULD be used only when the stream data is large.
+	Digest string `protobuf:"bytes,3,opt,name=digest" json:"digest,omitempty"`
+}
+
+func (m *ADSEntry) Reset()                    { *m = ADSEntry{} }
+func (m *ADSEntry) String() string            { return proto1.CompactTextString(m) }
+func (*ADSEntry) ProtoMessage()               {}
+func (*ADSEntry) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{3} }
+
+func init() {
+	proto1.RegisterType((*Manifest)(nil), "proto.Manifest")
+	proto1.RegisterType((*Resource)(nil), "proto.Resource")
+	proto1.RegisterType((*XAttr)(nil), "proto.XAttr")
+	proto1.RegisterType((*ADSEntry)(nil), "proto.ADSEntry")
+}
+
+func init() { proto1.RegisterFile("manifest.proto", fileDescriptor0) }
+
+var fileDescriptor0 = []byte{
+	// 317 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x8c, 0x90, 0x4f, 0x4b, 0xf3, 0x40,
+	0x10, 0xc6, 0x49, 0x93, 0xf4, 0x4d, 0xa7, 0xed, 0xab, 0x2c, 0x52, 0xe6, 0x18, 0x73, 0x0a, 0x08,
+	0x15, 0xf4, 0xe0, 0xb9, 0xa2, 0x17, 0xc1, 0xcb, 0x7a, 0xf1, 0xba, 0xba, 0x6b, 0x5c, 0x21, 0xd9,
+	0xb0, 0xd9, 0x80, 0xfa, 0xe5, 0xfc, 0x6a, 0x32, 0xb3, 0x69, 0xd1, 0x9b, 0xa7, 0x3c, 0xcf, 0x6f,
+	0xfe, 0x64, 0xf6, 0x81, 0xff, 0xad, 0xea, 0xec, 0x8b, 0x19, 0xc2, 0xb6, 0xf7, 0x2e, 0x38, 0x91,
+	0xf3, 0xa7, 0xba, 0x82, 0xe2, 0x7e, 0x2a, 0x88, 0x33, 0x28, 0xbc, 0x19, 0xdc, 0xe8, 0x9f, 0x0d,
+	0x26, 0x65, 0x5a, 0x2f, 0x2f, 0x8e, 0x62, 0xf3, 0x56, 0x4e, 0x58, 0x1e, 0x1a, 0xaa, 0xaf, 0x19,
+	0x14, 0x7b, 0x2c, 0x04, 0x64, 0xbd, 0x0a, 0xaf, 0x3c, 0xb5, 0x90, 0xac, 0xc5, 0x31, 0xa4, 0xa3,
+	0xd5, 0x38, 0x2b, 0x93, 0x3a, 0x95, 0x24, 0x89, 0x34, 0x56, 0x63, 0x1a, 0x49, 0x63, 0xb5, 0xd8,
+	0x40, 0x36, 0x0e, 0xc6, 0x63, 0x56, 0x26, 0xf5, 0xe2, 0x7a, 0x86, 0x89, 0x64, 0x2f, 0x10, 0xf2,
+	0xc6, 0xbb, 0xb1, 0xc7, 0xfc, 0x50, 0x88, 0x80, 0xfe, 0xd4, 0x3a, 0x6d, 0x70, 0x5e, 0x26, 0xf5,
+	0x5a, 0xb2, 0x26, 0x36, 0xd8, 0x4f, 0x83, 0xff, 0xca, 0xa4, 0xce, 0x24, 0x6b, 0xb1, 0x81, 0xb9,
+	0xb6, 0x8d, 0x19, 0x02, 0x16, 0x7c, 0xd3, 0xe4, 0x88, 0x07, 0xe5, 0x1b, 0x13, 0x70, 0x41, 0xab,
+	0xe5, 0xe4, 0xc4, 0x09, 0xe4, 0xad, 0x7a, 0x73, 0x1e, 0x81, 0x97, 0x44, 0xc3, 0xd4, 0x76, 0xce,
+	0xe3, 0x72, 0xa2, 0x64, 0x44, 0x05, 0xf9, 0xbb, 0x0a, 0xc1, 0xe3, 0x8a, 0x43, 0x5a, 0x4d, 0x21,
+	0x3d, 0xee, 0x42, 0xf0, 0x32, 0x96, 0xc4, 0x29, 0xa4, 0x4a, 0x0f, 0xb8, 0xfe, 0x15, 0xe3, 0xee,
+	0xe6, 0xe1, 0xb6, 0x0b, 0xfe, 0x43, 0x52, 0xad, 0x3a, 0x87, 0x9c, 0x47, 0xe8, 0xfe, 0x4e, 0xb5,
+	0x94, 0x39, 0x5d, 0xc4, 0x9a, 0x98, 0x56, 0x41, 0x71, 0x7c, 0x2b, 0xc9, 0xba, 0xba, 0x83, 0x62,
+	0xbf, 0xe1, 0xaf, 0x33, 0x3f, 0x72, 0x48, 0xe3, 0x7b, 0xa3, 0x7b, 0x9a, 0xf3, 0x45, 0x97, 0xdf,
+	0x01, 0x00, 0x00, 0xff, 0xff, 0xef, 0x27, 0x99, 0xf7, 0x17, 0x02, 0x00, 0x00,
+}

vendor/github.com/containerd/continuity/proto/manifest.proto

@@ -0,0 +1,97 @@
+syntax = "proto3";
+
+package proto;
+
+// Manifest specifies the entries in a container bundle, keyed and sorted by
+// path.
+message Manifest {
+    repeated Resource resource = 1;
+}
+
+message Resource {
+    // Path specifies the path from the bundle root. If more than one
+    // path is present, the entry may represent a hardlink, rather than using
+    // a link target. The path format is operating system specific.
+    repeated string path = 1;
+
+    // NOTE(stevvooe): Need to define clear precedence for user/group/uid/gid precedence.
+
+    // Uid specifies the user id for the resource.
+    int64 uid = 2;
+
+    // Gid specifies the group id for the resource.
+    int64 gid = 3;
+
+    // user and group are not currently used but their field numbers have been
+    // reserved for future use. As such, they are marked as deprecated.
+    string user = 4 [deprecated=true]; // "deprecated" stands for "reserved" here
+    string group = 5 [deprecated=true]; // "deprecated" stands for "reserved" here
+
+    // Mode defines the file mode and permissions. We've used the same
+    // bit-packing from Go's os package,
+    // http://golang.org/pkg/os/#FileMode, since they've done the work of
+    // creating a cross-platform layout.
+    uint32 mode = 6;
+
+    // NOTE(stevvooe): Beyond here, we start defining type specific fields.
+
+    // Size specifies the size in bytes of the resource. This is only valid
+    // for regular files.
+    uint64 size = 7;
+
+    // Digest specifies the content digest of the target file. Only valid for
+    // regular files. The strings are formatted in OCI style, i.e. <alg>:<encoded>.
+    // For detailed information about the format, please refer to OCI Image Spec:
+    // https://github.com/opencontainers/image-spec/blob/master/descriptor.md#digests-and-verification
+    // The digests are sorted in lexical order and implementations may choose
+    // which algorithms they prefer.
+    repeated string digest = 8;
+
+    // Target defines the target of a hard or soft link. Absolute links start
+    // with a slash and specify the resource relative to the bundle root.
+    // Relative links do not start with a slash and are relative to the
+    // resource path.
+    string target = 9;
+
+    // Major specifies the major device number for character and block devices.
+    uint64 major = 10;
+
+    // Minor specifies the minor device number for character and block devices.
+    uint64 minor = 11;
+
+    // Xattr provides storage for extended attributes for the target resource.
+    repeated XAttr xattr = 12;
+
+    // Ads stores one or more alternate data streams for the target resource.
+    repeated ADSEntry ads = 13;
+
+}
+
+// XAttr encodes extended attributes for a resource.
+message XAttr {
+    // Name specifies the attribute name.
+    string name = 1;
+
+    // Data specifies the associated data for the attribute.
+    bytes data = 2;
+}
+
+// ADSEntry encodes information for a Windows Alternate Data Stream.
+message ADSEntry {
+    // Name specifices the stream name.
+    string name = 1;
+
+    // Data specifies the stream data.
+    // See also the description about the digest below.
+    bytes data = 2;
+
+    // Digest is a CAS representation of the stream data.
+    //
+    // At least one of data or digest MUST be specified, and either one of them
+    // SHOULD be specified.
+    //
+    // How to access the actual data using the digest is implementation-specific,
+    // and implementations can choose not to implement digest.
+    // So, digest SHOULD be used only when the stream data is large.
+    string digest = 3;
+}

vendor/github.com/containerd/continuity/sysx/asm.s

@@ -0,0 +1,10 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !gccgo
+
+#include "textflag.h"
+
+TEXT ·use(SB),NOSPLIT,$0
+	RET

vendor/github.com/containerd/continuity/sysx/chmod_darwin.go

@@ -0,0 +1,18 @@
+package sysx
+
+const (
+	// AtSymlinkNoFollow defined from AT_SYMLINK_NOFOLLOW in <sys/fcntl.h>
+	AtSymlinkNofollow = 0x20
+)
+
+const (
+
+	// SYS_FCHMODAT defined from golang.org/sys/unix
+	SYS_FCHMODAT = 467
+)
+
+// These functions will be generated by generate.sh
+//    $ GOOS=darwin GOARCH=386 ./generate.sh chmod
+//    $ GOOS=darwin GOARCH=amd64 ./generate.sh chmod
+
+//sys  Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)

vendor/github.com/containerd/continuity/sysx/chmod_darwin_386.go

@@ -0,0 +1,25 @@
+// mksyscall.pl -l32 chmod_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall6(SYS_FCHMODAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
+	use(unsafe.Pointer(_p0))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/chmod_darwin_amd64.go

@@ -0,0 +1,25 @@
+// mksyscall.pl chmod_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall6(SYS_FCHMODAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
+	use(unsafe.Pointer(_p0))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/chmod_freebsd.go

@@ -0,0 +1,17 @@
+package sysx
+
+const (
+	// AtSymlinkNoFollow defined from AT_SYMLINK_NOFOLLOW in <sys/fcntl.h>
+	AtSymlinkNofollow = 0x200
+)
+
+const (
+
+	// SYS_FCHMODAT defined from golang.org/sys/unix
+	SYS_FCHMODAT = 490
+)
+
+// These functions will be generated by generate.sh
+//    $ GOOS=freebsd GOARCH=amd64 ./generate.sh chmod
+
+//sys  Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)

vendor/github.com/containerd/continuity/sysx/chmod_freebsd_amd64.go

@@ -0,0 +1,25 @@
+// mksyscall.pl chmod_freebsd.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall6(SYS_FCHMODAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
+	use(unsafe.Pointer(_p0))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/chmod_linux.go

@@ -0,0 +1,12 @@
+package sysx
+
+import "syscall"
+
+const (
+	// AtSymlinkNoFollow defined from AT_SYMLINK_NOFOLLOW in /usr/include/linux/fcntl.h
+	AtSymlinkNofollow = 0x100
+)
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) error {
+	return syscall.Fchmodat(dirfd, path, mode, flags)
+}

vendor/github.com/containerd/continuity/sysx/chmod_solaris.go

@@ -0,0 +1,11 @@
+package sysx
+
+import "golang.org/x/sys/unix"
+
+const (
+	AtSymlinkNofollow = unix.AT_SYMLINK_NOFOLLOW
+)
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) error {
+	return unix.Fchmodat(dirfd, path, mode, flags)
+}

vendor/github.com/containerd/continuity/sysx/generate.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -e
+
+mksyscall="$(go env GOROOT)/src/syscall/mksyscall.pl"
+
+fix() {
+	sed 's,^package syscall$,package sysx,' \
+		| sed 's,^import "unsafe"$,import (\n\t"syscall"\n\t"unsafe"\n),' \
+		| gofmt -r='BytePtrFromString -> syscall.BytePtrFromString' \
+		| gofmt -r='Syscall6 -> syscall.Syscall6' \
+		| gofmt -r='Syscall -> syscall.Syscall' \
+		| gofmt -r='SYS_GETXATTR -> syscall.SYS_GETXATTR' \
+		| gofmt -r='SYS_LISTXATTR -> syscall.SYS_LISTXATTR' \
+		| gofmt -r='SYS_SETXATTR -> syscall.SYS_SETXATTR' \
+		| gofmt -r='SYS_REMOVEXATTR -> syscall.SYS_REMOVEXATTR' \
+		| gofmt -r='SYS_LGETXATTR -> syscall.SYS_LGETXATTR' \
+		| gofmt -r='SYS_LLISTXATTR -> syscall.SYS_LLISTXATTR' \
+		| gofmt -r='SYS_LSETXATTR -> syscall.SYS_LSETXATTR' \
+		| gofmt -r='SYS_LREMOVEXATTR -> syscall.SYS_LREMOVEXATTR'
+}
+
+if [ "$GOARCH" == "" ] || [ "$GOOS" == "" ]; then
+	echo "Must specify \$GOARCH and \$GOOS"
+	exit 1
+fi
+
+mkargs=""
+
+if [ "$GOARCH" == "386" ] || [ "$GOARCH" == "arm" ]; then
+	mkargs="-l32"
+fi
+
+for f in "$@"; do
+	$mksyscall $mkargs "${f}_${GOOS}.go" | fix > "${f}_${GOOS}_${GOARCH}.go"
+done
+

vendor/github.com/containerd/continuity/sysx/nodata_linux.go

@@ -0,0 +1,7 @@
+package sysx
+
+import (
+	"syscall"
+)
+
+const ENODATA = syscall.ENODATA

vendor/github.com/containerd/continuity/sysx/nodata_solaris.go

@@ -0,0 +1,8 @@
+package sysx
+
+import (
+	"syscall"
+)
+
+// This should actually be a set that contains ENOENT and EPERM
+const ENODATA = syscall.ENOENT

vendor/github.com/containerd/continuity/sysx/nodata_unix.go

@@ -0,0 +1,9 @@
+// +build darwin freebsd
+
+package sysx
+
+import (
+	"syscall"
+)
+
+const ENODATA = syscall.ENOATTR

vendor/github.com/containerd/continuity/sysx/sys.go

@@ -0,0 +1,37 @@
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var _zero uintptr
+
+// use is a no-op, but the compiler cannot see that it is.
+// Calling use(p) ensures that p is kept live until that point.
+//go:noescape
+func use(p unsafe.Pointer)
+
+// Do the interface allocations only once for common
+// Errno values.
+var (
+	errEAGAIN error = syscall.EAGAIN
+	errEINVAL error = syscall.EINVAL
+	errENOENT error = syscall.ENOENT
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case syscall.EAGAIN:
+		return errEAGAIN
+	case syscall.EINVAL:
+		return errEINVAL
+	case syscall.ENOENT:
+		return errENOENT
+	}
+	return e
+}

vendor/github.com/containerd/continuity/sysx/sysnum_linux_386.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPYFILERANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm/unistd_32.h
+	SYS_COPY_FILE_RANGE = 377
+)

vendor/github.com/containerd/continuity/sysx/sysnum_linux_amd64.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPYFILERANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm/unistd_64.h
+	SYS_COPY_FILE_RANGE = 326
+)

vendor/github.com/containerd/continuity/sysx/sysnum_linux_arm.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPY_FILE_RANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/arm-linux-gnueabihf/asm/unistd.h
+	SYS_COPY_FILE_RANGE = 391
+)

vendor/github.com/containerd/continuity/sysx/sysnum_linux_arm64.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPY_FILE_RANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm-generic/unistd.h
+	SYS_COPY_FILE_RANGE = 285
+)

vendor/github.com/containerd/continuity/sysx/sysnum_linux_ppc64le.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPYFILERANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm/unistd_64.h
+	SYS_COPY_FILE_RANGE = 379
+)

vendor/github.com/containerd/continuity/sysx/sysnum_linux_s390x.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPYFILERANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm/unistd_64.h
+	SYS_COPY_FILE_RANGE = 375
+)

vendor/github.com/containerd/continuity/sysx/xattr.go

@@ -0,0 +1,67 @@
+package sysx
+
+import (
+	"bytes"
+	"fmt"
+	"syscall"
+)
+
+const defaultXattrBufferSize = 5
+
+var ErrNotSupported = fmt.Errorf("not supported")
+
+type listxattrFunc func(path string, dest []byte) (int, error)
+
+func listxattrAll(path string, listFunc listxattrFunc) ([]string, error) {
+	var p []byte // nil on first execution
+
+	for {
+		n, err := listFunc(path, p) // first call gets buffer size.
+		if err != nil {
+			return nil, err
+		}
+
+		if n > len(p) {
+			p = make([]byte, n)
+			continue
+		}
+
+		p = p[:n]
+
+		ps := bytes.Split(bytes.TrimSuffix(p, []byte{0}), []byte{0})
+		var entries []string
+		for _, p := range ps {
+			s := string(p)
+			if s != "" {
+				entries = append(entries, s)
+			}
+		}
+
+		return entries, nil
+	}
+}
+
+type getxattrFunc func(string, string, []byte) (int, error)
+
+func getxattrAll(path, attr string, getFunc getxattrFunc) ([]byte, error) {
+	p := make([]byte, defaultXattrBufferSize)
+	for {
+		n, err := getFunc(path, attr, p)
+		if err != nil {
+			if errno, ok := err.(syscall.Errno); ok && errno == syscall.ERANGE {
+				p = make([]byte, len(p)*2) // this can't be ideal.
+				continue                   // try again!
+			}
+
+			return nil, err
+		}
+
+		// realloc to correct size and repeat
+		if n > len(p) {
+			p = make([]byte, n)
+			continue
+		}
+
+		return p[:n], nil
+	}
+}

vendor/github.com/containerd/continuity/sysx/xattr_darwin.go

@@ -0,0 +1,71 @@
+package sysx
+
+// These functions will be generated by generate.sh
+//    $ GOOS=darwin GOARCH=386 ./generate.sh xattr
+//    $ GOOS=darwin GOARCH=amd64 ./generate.sh xattr
+
+//sys  getxattr(path string, attr string, dest []byte, pos int, options int) (sz int, err error)
+//sys  setxattr(path string, attr string, data []byte, flags int) (err error)
+//sys  removexattr(path string, attr string, options int) (err error)
+//sys  listxattr(path string, dest []byte, options int) (sz int, err error)
+//sys  Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
+
+const (
+	xattrNoFollow = 0x01
+)
+
+func listxattrFollow(path string, dest []byte) (sz int, err error) {
+	return listxattr(path, dest, 0)
+}
+
+// Listxattr calls syscall getxattr
+func Listxattr(path string) ([]string, error) {
+	return listxattrAll(path, listxattrFollow)
+}
+
+// Removexattr calls syscall getxattr
+func Removexattr(path string, attr string) (err error) {
+	return removexattr(path, attr, 0)
+}
+
+// Setxattr calls syscall setxattr
+func Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	return setxattr(path, attr, data, flags)
+}
+
+func getxattrFollow(path, attr string, dest []byte) (sz int, err error) {
+	return getxattr(path, attr, dest, 0, 0)
+}
+
+// Getxattr calls syscall getxattr
+func Getxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, getxattrFollow)
+}
+
+func listxattrNoFollow(path string, dest []byte) (sz int, err error) {
+	return listxattr(path, dest, xattrNoFollow)
+}
+
+// LListxattr calls syscall listxattr with XATTR_NOFOLLOW
+func LListxattr(path string) ([]string, error) {
+	return listxattrAll(path, listxattrNoFollow)
+}
+
+// LRemovexattr calls syscall removexattr with XATTR_NOFOLLOW
+func LRemovexattr(path string, attr string) (err error) {
+	return removexattr(path, attr, xattrNoFollow)
+}
+
+// Setxattr calls syscall setxattr with XATTR_NOFOLLOW
+func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
+	return setxattr(path, attr, data, flags|xattrNoFollow)
+}
+
+func getxattrNoFollow(path, attr string, dest []byte) (sz int, err error) {
+	return getxattr(path, attr, dest, 0, xattrNoFollow)
+}
+
+// LGetxattr calls syscall getxattr with XATTR_NOFOLLOW
+func LGetxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, getxattrNoFollow)
+}

vendor/github.com/containerd/continuity/sysx/xattr_darwin_386.go

@@ -0,0 +1,111 @@
+// mksyscall.pl -l32 xattr_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func getxattr(path string, attr string, dest []byte, pos int, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), uintptr(pos), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func setxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func removexattr(path string, attr string, options int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func listxattr(path string, dest []byte, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)), uintptr(options), 0, 0)
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/xattr_darwin_amd64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func getxattr(path string, attr string, dest []byte, pos int, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), uintptr(pos), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func setxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func removexattr(path string, attr string, options int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func listxattr(path string, dest []byte, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)), uintptr(options), 0, 0)
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/xattr_freebsd.go

@@ -0,0 +1,12 @@
+package sysx
+
+import (
+	"errors"
+)
+
+// Initial stub version for FreeBSD. FreeBSD has a different
+// syscall API from Darwin and Linux for extended attributes;
+// it is also not widely used. It is not exposed at all by the
+// Go syscall package, so we need to implement directly eventually.
+
+var unsupported = errors.New("extended attributes unsupported on FreeBSD")

vendor/github.com/containerd/continuity/sysx/xattr_linux.go

@@ -0,0 +1,61 @@
+package sysx
+
+import "syscall"
+
+// These functions will be generated by generate.sh
+//    $ GOOS=linux GOARCH=386 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=amd64 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=arm ./generate.sh xattr
+//    $ GOOS=linux GOARCH=arm64 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=ppc64 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=ppc64le ./generate.sh xattr
+//    $ GOOS=linux GOARCH=s390x ./generate.sh xattr
+
+// Listxattr calls syscall listxattr and reads all content
+// and returns a string array
+func Listxattr(path string) ([]string, error) {
+	return listxattrAll(path, syscall.Listxattr)
+}
+
+// Removexattr calls syscall removexattr
+func Removexattr(path string, attr string) (err error) {
+	return syscall.Removexattr(path, attr)
+}
+
+// Setxattr calls syscall setxattr
+func Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	return syscall.Setxattr(path, attr, data, flags)
+}
+
+// Getxattr calls syscall getxattr
+func Getxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, syscall.Getxattr)
+}
+
+//sys llistxattr(path string, dest []byte) (sz int, err error)
+
+// LListxattr lists xattrs, not following symlinks
+func LListxattr(path string) ([]string, error) {
+	return listxattrAll(path, llistxattr)
+}
+
+//sys lremovexattr(path string, attr string) (err error)
+
+// LRemovexattr removes an xattr, not following symlinks
+func LRemovexattr(path string, attr string) (err error) {
+	return lremovexattr(path, attr)
+}
+
+//sys lsetxattr(path string, attr string, data []byte, flags int) (err error)
+
+// LSetxattr sets an xattr, not following symlinks
+func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
+	return lsetxattr(path, attr, data, flags)
+}
+
+//sys lgetxattr(path string, attr string, dest []byte) (sz int, err error)
+
+// LGetxattr gets an xattr, not following symlinks
+func LGetxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, lgetxattr)
+}

vendor/github.com/containerd/continuity/sysx/xattr_linux_386.go

@@ -0,0 +1,111 @@
+// mksyscall.pl -l32 xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/xattr_linux_amd64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/xattr_linux_arm.go

@@ -0,0 +1,111 @@
+// mksyscall.pl -l32 xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/xattr_linux_arm64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/containerd/continuity/sysx/xattr_linux_ppc64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}