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937 lines
26 KiB
Go
937 lines
26 KiB
Go
//+build windows
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package windows // import "github.com/docker/docker/daemon/graphdriver/windows"
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import (
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"bufio"
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"unsafe"
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"github.com/Microsoft/go-winio"
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"github.com/Microsoft/go-winio/archive/tar"
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"github.com/Microsoft/go-winio/backuptar"
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"github.com/Microsoft/hcsshim"
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"github.com/docker/docker/daemon/graphdriver"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/containerfs"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/docker/docker/pkg/longpath"
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"github.com/docker/docker/pkg/reexec"
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"github.com/docker/docker/pkg/system"
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units "github.com/docker/go-units"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/windows"
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)
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// filterDriver is an HCSShim driver type for the Windows Filter driver.
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const filterDriver = 1
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var (
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// mutatedFiles is a list of files that are mutated by the import process
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// and must be backed up and restored.
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mutatedFiles = map[string]string{
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"UtilityVM/Files/EFI/Microsoft/Boot/BCD": "bcd.bak",
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"UtilityVM/Files/EFI/Microsoft/Boot/BCD.LOG": "bcd.log.bak",
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"UtilityVM/Files/EFI/Microsoft/Boot/BCD.LOG1": "bcd.log1.bak",
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"UtilityVM/Files/EFI/Microsoft/Boot/BCD.LOG2": "bcd.log2.bak",
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}
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noreexec = false
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)
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// init registers the windows graph drivers to the register.
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func init() {
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graphdriver.Register("windowsfilter", InitFilter)
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// DOCKER_WINDOWSFILTER_NOREEXEC allows for inline processing which makes
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// debugging issues in the re-exec codepath significantly easier.
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if os.Getenv("DOCKER_WINDOWSFILTER_NOREEXEC") != "" {
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logrus.Warnf("WindowsGraphDriver is set to not re-exec. This is intended for debugging purposes only.")
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noreexec = true
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} else {
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reexec.Register("docker-windows-write-layer", writeLayerReexec)
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}
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}
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type checker struct {
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}
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func (c *checker) IsMounted(path string) bool {
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return false
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}
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// Driver represents a windows graph driver.
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type Driver struct {
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// info stores the shim driver information
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info hcsshim.DriverInfo
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ctr *graphdriver.RefCounter
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// it is safe for windows to use a cache here because it does not support
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// restoring containers when the daemon dies.
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cacheMu sync.Mutex
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cache map[string]string
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}
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// InitFilter returns a new Windows storage filter driver.
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func InitFilter(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
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logrus.Debugf("WindowsGraphDriver InitFilter at %s", home)
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fsType, err := getFileSystemType(string(home[0]))
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if err != nil {
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return nil, err
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}
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if strings.ToLower(fsType) == "refs" {
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return nil, fmt.Errorf("%s is on an ReFS volume - ReFS volumes are not supported", home)
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}
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if err := idtools.MkdirAllAndChown(home, 0700, idtools.IDPair{UID: 0, GID: 0}); err != nil {
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return nil, fmt.Errorf("windowsfilter failed to create '%s': %v", home, err)
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}
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d := &Driver{
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info: hcsshim.DriverInfo{
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HomeDir: home,
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Flavour: filterDriver,
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},
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cache: make(map[string]string),
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ctr: graphdriver.NewRefCounter(&checker{}),
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}
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return d, nil
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}
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// win32FromHresult is a helper function to get the win32 error code from an HRESULT
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func win32FromHresult(hr uintptr) uintptr {
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if hr&0x1fff0000 == 0x00070000 {
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return hr & 0xffff
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}
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return hr
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}
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// getFileSystemType obtains the type of a file system through GetVolumeInformation
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// https://msdn.microsoft.com/en-us/library/windows/desktop/aa364993(v=vs.85).aspx
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func getFileSystemType(drive string) (fsType string, hr error) {
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var (
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modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
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procGetVolumeInformation = modkernel32.NewProc("GetVolumeInformationW")
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buf = make([]uint16, 255)
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size = windows.MAX_PATH + 1
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)
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if len(drive) != 1 {
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hr = errors.New("getFileSystemType must be called with a drive letter")
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return
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}
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drive += `:\`
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n := uintptr(unsafe.Pointer(nil))
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r0, _, _ := syscall.Syscall9(procGetVolumeInformation.Addr(), 8, uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(drive))), n, n, n, n, n, uintptr(unsafe.Pointer(&buf[0])), uintptr(size), 0)
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if int32(r0) < 0 {
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hr = syscall.Errno(win32FromHresult(r0))
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}
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fsType = windows.UTF16ToString(buf)
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return
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}
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// String returns the string representation of a driver. This should match
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// the name the graph driver has been registered with.
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func (d *Driver) String() string {
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return "windowsfilter"
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}
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// Status returns the status of the driver.
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func (d *Driver) Status() [][2]string {
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return [][2]string{
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{"Windows", ""},
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}
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}
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// Exists returns true if the given id is registered with this driver.
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func (d *Driver) Exists(id string) bool {
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rID, err := d.resolveID(id)
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if err != nil {
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return false
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}
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result, err := hcsshim.LayerExists(d.info, rID)
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if err != nil {
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return false
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}
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return result
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}
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// CreateReadWrite creates a layer that is writable for use as a container
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// file system.
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func (d *Driver) CreateReadWrite(id, parent string, opts *graphdriver.CreateOpts) error {
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if opts != nil {
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return d.create(id, parent, opts.MountLabel, false, opts.StorageOpt)
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}
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return d.create(id, parent, "", false, nil)
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}
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// Create creates a new read-only layer with the given id.
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func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) error {
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if opts != nil {
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return d.create(id, parent, opts.MountLabel, true, opts.StorageOpt)
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}
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return d.create(id, parent, "", true, nil)
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}
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func (d *Driver) create(id, parent, mountLabel string, readOnly bool, storageOpt map[string]string) error {
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rPId, err := d.resolveID(parent)
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if err != nil {
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return err
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}
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parentChain, err := d.getLayerChain(rPId)
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if err != nil {
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return err
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}
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var layerChain []string
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if rPId != "" {
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parentPath, err := hcsshim.GetLayerMountPath(d.info, rPId)
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if err != nil {
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return err
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}
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if _, err := os.Stat(filepath.Join(parentPath, "Files")); err == nil {
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// This is a legitimate parent layer (not the empty "-init" layer),
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// so include it in the layer chain.
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layerChain = []string{parentPath}
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}
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}
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layerChain = append(layerChain, parentChain...)
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if readOnly {
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if err := hcsshim.CreateLayer(d.info, id, rPId); err != nil {
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return err
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}
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} else {
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var parentPath string
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if len(layerChain) != 0 {
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parentPath = layerChain[0]
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}
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if err := hcsshim.CreateSandboxLayer(d.info, id, parentPath, layerChain); err != nil {
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return err
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}
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storageOptions, err := parseStorageOpt(storageOpt)
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if err != nil {
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return fmt.Errorf("Failed to parse storage options - %s", err)
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}
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if storageOptions.size != 0 {
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if err := hcsshim.ExpandSandboxSize(d.info, id, storageOptions.size); err != nil {
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return err
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}
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}
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}
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if _, err := os.Lstat(d.dir(parent)); err != nil {
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if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
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logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
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}
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return fmt.Errorf("Cannot create layer with missing parent %s: %s", parent, err)
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}
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if err := d.setLayerChain(id, layerChain); err != nil {
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if err2 := hcsshim.DestroyLayer(d.info, id); err2 != nil {
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logrus.Warnf("Failed to DestroyLayer %s: %s", id, err2)
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}
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return err
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}
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return nil
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}
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// dir returns the absolute path to the layer.
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func (d *Driver) dir(id string) string {
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return filepath.Join(d.info.HomeDir, filepath.Base(id))
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}
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// Remove unmounts and removes the dir information.
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func (d *Driver) Remove(id string) error {
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rID, err := d.resolveID(id)
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if err != nil {
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return err
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}
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// This retry loop is due to a bug in Windows (Internal bug #9432268)
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// if GetContainers fails with ErrVmcomputeOperationInvalidState
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// it is a transient error. Retry until it succeeds.
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var computeSystems []hcsshim.ContainerProperties
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retryCount := 0
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osv := system.GetOSVersion()
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for {
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// Get and terminate any template VMs that are currently using the layer.
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// Note: It is unfortunate that we end up in the graphdrivers Remove() call
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// for both containers and images, but the logic for template VMs is only
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// needed for images - specifically we are looking to see if a base layer
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// is in use by a template VM as a result of having started a Hyper-V
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// container at some point.
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//
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// We have a retry loop for ErrVmcomputeOperationInvalidState and
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// ErrVmcomputeOperationAccessIsDenied as there is a race condition
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// in RS1 and RS2 building during enumeration when a silo is going away
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// for example under it, in HCS. AccessIsDenied added to fix 30278.
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//
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// TODO @jhowardmsft - For RS3, we can remove the retries. Also consider
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// using platform APIs (if available) to get this more succinctly. Also
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// consider enhancing the Remove() interface to have context of why
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// the remove is being called - that could improve efficiency by not
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// enumerating compute systems during a remove of a container as it's
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// not required.
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computeSystems, err = hcsshim.GetContainers(hcsshim.ComputeSystemQuery{})
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if err != nil {
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if (osv.Build < 15139) &&
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((err == hcsshim.ErrVmcomputeOperationInvalidState) || (err == hcsshim.ErrVmcomputeOperationAccessIsDenied)) {
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if retryCount >= 500 {
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break
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}
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retryCount++
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time.Sleep(10 * time.Millisecond)
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continue
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}
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return err
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}
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break
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}
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for _, computeSystem := range computeSystems {
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if strings.Contains(computeSystem.RuntimeImagePath, id) && computeSystem.IsRuntimeTemplate {
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container, err := hcsshim.OpenContainer(computeSystem.ID)
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if err != nil {
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return err
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}
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defer container.Close()
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err = container.Terminate()
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if hcsshim.IsPending(err) {
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err = container.Wait()
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} else if hcsshim.IsAlreadyStopped(err) {
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err = nil
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}
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if err != nil {
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return err
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}
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}
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}
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layerPath := filepath.Join(d.info.HomeDir, rID)
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tmpID := fmt.Sprintf("%s-removing", rID)
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tmpLayerPath := filepath.Join(d.info.HomeDir, tmpID)
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if err := os.Rename(layerPath, tmpLayerPath); err != nil && !os.IsNotExist(err) {
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return err
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}
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if err := hcsshim.DestroyLayer(d.info, tmpID); err != nil {
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logrus.Errorf("Failed to DestroyLayer %s: %s", id, err)
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}
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return nil
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}
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// Get returns the rootfs path for the id. This will mount the dir at its given path.
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func (d *Driver) Get(id, mountLabel string) (containerfs.ContainerFS, error) {
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logrus.Debugf("WindowsGraphDriver Get() id %s mountLabel %s", id, mountLabel)
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var dir string
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rID, err := d.resolveID(id)
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if err != nil {
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return nil, err
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}
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if count := d.ctr.Increment(rID); count > 1 {
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return containerfs.NewLocalContainerFS(d.cache[rID]), nil
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}
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// Getting the layer paths must be done outside of the lock.
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layerChain, err := d.getLayerChain(rID)
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if err != nil {
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d.ctr.Decrement(rID)
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return nil, err
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}
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if err := hcsshim.ActivateLayer(d.info, rID); err != nil {
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d.ctr.Decrement(rID)
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return nil, err
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}
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if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
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d.ctr.Decrement(rID)
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if err2 := hcsshim.DeactivateLayer(d.info, rID); err2 != nil {
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logrus.Warnf("Failed to Deactivate %s: %s", id, err)
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}
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return nil, err
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}
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mountPath, err := hcsshim.GetLayerMountPath(d.info, rID)
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if err != nil {
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d.ctr.Decrement(rID)
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if err := hcsshim.UnprepareLayer(d.info, rID); err != nil {
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logrus.Warnf("Failed to Unprepare %s: %s", id, err)
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}
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if err2 := hcsshim.DeactivateLayer(d.info, rID); err2 != nil {
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logrus.Warnf("Failed to Deactivate %s: %s", id, err)
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}
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return nil, err
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}
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d.cacheMu.Lock()
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d.cache[rID] = mountPath
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d.cacheMu.Unlock()
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// If the layer has a mount path, use that. Otherwise, use the
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// folder path.
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if mountPath != "" {
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dir = mountPath
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} else {
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dir = d.dir(id)
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}
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return containerfs.NewLocalContainerFS(dir), nil
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}
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// Put adds a new layer to the driver.
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func (d *Driver) Put(id string) error {
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logrus.Debugf("WindowsGraphDriver Put() id %s", id)
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rID, err := d.resolveID(id)
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if err != nil {
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return err
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}
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if count := d.ctr.Decrement(rID); count > 0 {
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return nil
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}
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d.cacheMu.Lock()
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_, exists := d.cache[rID]
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delete(d.cache, rID)
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d.cacheMu.Unlock()
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// If the cache was not populated, then the layer was left unprepared and deactivated
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if !exists {
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return nil
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}
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if err := hcsshim.UnprepareLayer(d.info, rID); err != nil {
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return err
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}
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return hcsshim.DeactivateLayer(d.info, rID)
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}
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// Cleanup ensures the information the driver stores is properly removed.
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// We use this opportunity to cleanup any -removing folders which may be
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// still left if the daemon was killed while it was removing a layer.
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func (d *Driver) Cleanup() error {
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items, err := ioutil.ReadDir(d.info.HomeDir)
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if err != nil {
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if os.IsNotExist(err) {
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return nil
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}
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return err
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}
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// Note we don't return an error below - it's possible the files
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// are locked. However, next time around after the daemon exits,
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// we likely will be able to to cleanup successfully. Instead we log
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// warnings if there are errors.
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for _, item := range items {
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if item.IsDir() && strings.HasSuffix(item.Name(), "-removing") {
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if err := hcsshim.DestroyLayer(d.info, item.Name()); err != nil {
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logrus.Warnf("Failed to cleanup %s: %s", item.Name(), err)
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} else {
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logrus.Infof("Cleaned up %s", item.Name())
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}
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}
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}
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return nil
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}
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// Diff produces an archive of the changes between the specified
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// layer and its parent layer which may be "".
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// The layer should be mounted when calling this function
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func (d *Driver) Diff(id, parent string) (_ io.ReadCloser, err error) {
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rID, err := d.resolveID(id)
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if err != nil {
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return
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}
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layerChain, err := d.getLayerChain(rID)
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if err != nil {
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return
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}
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// this is assuming that the layer is unmounted
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if err := hcsshim.UnprepareLayer(d.info, rID); err != nil {
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return nil, err
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}
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prepare := func() {
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if err := hcsshim.PrepareLayer(d.info, rID, layerChain); err != nil {
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logrus.Warnf("Failed to Deactivate %s: %s", rID, err)
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}
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}
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arch, err := d.exportLayer(rID, layerChain)
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if err != nil {
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prepare()
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return
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}
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return ioutils.NewReadCloserWrapper(arch, func() error {
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err := arch.Close()
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prepare()
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return err
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}), nil
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}
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// Changes produces a list of changes between the specified layer
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// and its parent layer. If parent is "", then all changes will be ADD changes.
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// The layer should not be mounted when calling this function.
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func (d *Driver) Changes(id, parent string) ([]archive.Change, error) {
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rID, err := d.resolveID(id)
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if err != nil {
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return nil, err
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}
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parentChain, err := d.getLayerChain(rID)
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if err != nil {
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return nil, err
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}
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if err := hcsshim.ActivateLayer(d.info, rID); err != nil {
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return nil, err
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}
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defer func() {
|
|
if err2 := hcsshim.DeactivateLayer(d.info, rID); err2 != nil {
|
|
logrus.Errorf("changes() failed to DeactivateLayer %s %s: %s", id, rID, err2)
|
|
}
|
|
}()
|
|
|
|
var changes []archive.Change
|
|
err = winio.RunWithPrivilege(winio.SeBackupPrivilege, func() error {
|
|
r, err := hcsshim.NewLayerReader(d.info, id, parentChain)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer r.Close()
|
|
|
|
for {
|
|
name, _, fileInfo, err := r.Next()
|
|
if err == io.EOF {
|
|
return nil
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
name = filepath.ToSlash(name)
|
|
if fileInfo == nil {
|
|
changes = append(changes, archive.Change{Path: name, Kind: archive.ChangeDelete})
|
|
} else {
|
|
// Currently there is no way to tell between an add and a modify.
|
|
changes = append(changes, archive.Change{Path: name, Kind: archive.ChangeModify})
|
|
}
|
|
}
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return changes, nil
|
|
}
|
|
|
|
// ApplyDiff extracts the changeset from the given diff into the
|
|
// layer with the specified id and parent, returning the size of the
|
|
// new layer in bytes.
|
|
// The layer should not be mounted when calling this function
|
|
func (d *Driver) ApplyDiff(id, parent string, diff io.Reader) (int64, error) {
|
|
var layerChain []string
|
|
if parent != "" {
|
|
rPId, err := d.resolveID(parent)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
parentChain, err := d.getLayerChain(rPId)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
parentPath, err := hcsshim.GetLayerMountPath(d.info, rPId)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
layerChain = append(layerChain, parentPath)
|
|
layerChain = append(layerChain, parentChain...)
|
|
}
|
|
|
|
size, err := d.importLayer(id, diff, layerChain)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
if err = d.setLayerChain(id, layerChain); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return size, nil
|
|
}
|
|
|
|
// DiffSize calculates the changes between the specified layer
|
|
// and its parent and returns the size in bytes of the changes
|
|
// relative to its base filesystem directory.
|
|
func (d *Driver) DiffSize(id, parent string) (size int64, err error) {
|
|
rPId, err := d.resolveID(parent)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
changes, err := d.Changes(id, rPId)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
layerFs, err := d.Get(id, "")
|
|
if err != nil {
|
|
return
|
|
}
|
|
defer d.Put(id)
|
|
|
|
return archive.ChangesSize(layerFs.Path(), changes), nil
|
|
}
|
|
|
|
// GetMetadata returns custom driver information.
|
|
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
|
|
m := make(map[string]string)
|
|
m["dir"] = d.dir(id)
|
|
return m, nil
|
|
}
|
|
|
|
func writeTarFromLayer(r hcsshim.LayerReader, w io.Writer) error {
|
|
t := tar.NewWriter(w)
|
|
for {
|
|
name, size, fileInfo, err := r.Next()
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if fileInfo == nil {
|
|
// Write a whiteout file.
|
|
hdr := &tar.Header{
|
|
Name: filepath.ToSlash(filepath.Join(filepath.Dir(name), archive.WhiteoutPrefix+filepath.Base(name))),
|
|
}
|
|
err := t.WriteHeader(hdr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
err = backuptar.WriteTarFileFromBackupStream(t, r, name, size, fileInfo)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
return t.Close()
|
|
}
|
|
|
|
// exportLayer generates an archive from a layer based on the given ID.
|
|
func (d *Driver) exportLayer(id string, parentLayerPaths []string) (io.ReadCloser, error) {
|
|
archive, w := io.Pipe()
|
|
go func() {
|
|
err := winio.RunWithPrivilege(winio.SeBackupPrivilege, func() error {
|
|
r, err := hcsshim.NewLayerReader(d.info, id, parentLayerPaths)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
err = writeTarFromLayer(r, w)
|
|
cerr := r.Close()
|
|
if err == nil {
|
|
err = cerr
|
|
}
|
|
return err
|
|
})
|
|
w.CloseWithError(err)
|
|
}()
|
|
|
|
return archive, nil
|
|
}
|
|
|
|
// writeBackupStreamFromTarAndSaveMutatedFiles reads data from a tar stream and
|
|
// writes it to a backup stream, and also saves any files that will be mutated
|
|
// by the import layer process to a backup location.
|
|
func writeBackupStreamFromTarAndSaveMutatedFiles(buf *bufio.Writer, w io.Writer, t *tar.Reader, hdr *tar.Header, root string) (nextHdr *tar.Header, err error) {
|
|
var bcdBackup *os.File
|
|
var bcdBackupWriter *winio.BackupFileWriter
|
|
if backupPath, ok := mutatedFiles[hdr.Name]; ok {
|
|
bcdBackup, err = os.Create(filepath.Join(root, backupPath))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer func() {
|
|
cerr := bcdBackup.Close()
|
|
if err == nil {
|
|
err = cerr
|
|
}
|
|
}()
|
|
|
|
bcdBackupWriter = winio.NewBackupFileWriter(bcdBackup, false)
|
|
defer func() {
|
|
cerr := bcdBackupWriter.Close()
|
|
if err == nil {
|
|
err = cerr
|
|
}
|
|
}()
|
|
|
|
buf.Reset(io.MultiWriter(w, bcdBackupWriter))
|
|
} else {
|
|
buf.Reset(w)
|
|
}
|
|
|
|
defer func() {
|
|
ferr := buf.Flush()
|
|
if err == nil {
|
|
err = ferr
|
|
}
|
|
}()
|
|
|
|
return backuptar.WriteBackupStreamFromTarFile(buf, t, hdr)
|
|
}
|
|
|
|
func writeLayerFromTar(r io.Reader, w hcsshim.LayerWriter, root string) (int64, error) {
|
|
t := tar.NewReader(r)
|
|
hdr, err := t.Next()
|
|
totalSize := int64(0)
|
|
buf := bufio.NewWriter(nil)
|
|
for err == nil {
|
|
base := path.Base(hdr.Name)
|
|
if strings.HasPrefix(base, archive.WhiteoutPrefix) {
|
|
name := path.Join(path.Dir(hdr.Name), base[len(archive.WhiteoutPrefix):])
|
|
err = w.Remove(filepath.FromSlash(name))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
hdr, err = t.Next()
|
|
} else if hdr.Typeflag == tar.TypeLink {
|
|
err = w.AddLink(filepath.FromSlash(hdr.Name), filepath.FromSlash(hdr.Linkname))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
hdr, err = t.Next()
|
|
} else {
|
|
var (
|
|
name string
|
|
size int64
|
|
fileInfo *winio.FileBasicInfo
|
|
)
|
|
name, size, fileInfo, err = backuptar.FileInfoFromHeader(hdr)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
err = w.Add(filepath.FromSlash(name), fileInfo)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
hdr, err = writeBackupStreamFromTarAndSaveMutatedFiles(buf, w, t, hdr, root)
|
|
totalSize += size
|
|
}
|
|
}
|
|
if err != io.EOF {
|
|
return 0, err
|
|
}
|
|
return totalSize, nil
|
|
}
|
|
|
|
// importLayer adds a new layer to the tag and graph store based on the given data.
|
|
func (d *Driver) importLayer(id string, layerData io.Reader, parentLayerPaths []string) (size int64, err error) {
|
|
if !noreexec {
|
|
cmd := reexec.Command(append([]string{"docker-windows-write-layer", d.info.HomeDir, id}, parentLayerPaths...)...)
|
|
output := bytes.NewBuffer(nil)
|
|
cmd.Stdin = layerData
|
|
cmd.Stdout = output
|
|
cmd.Stderr = output
|
|
|
|
if err = cmd.Start(); err != nil {
|
|
return
|
|
}
|
|
|
|
if err = cmd.Wait(); err != nil {
|
|
return 0, fmt.Errorf("re-exec error: %v: output: %s", err, output)
|
|
}
|
|
|
|
return strconv.ParseInt(output.String(), 10, 64)
|
|
}
|
|
return writeLayer(layerData, d.info.HomeDir, id, parentLayerPaths...)
|
|
}
|
|
|
|
// writeLayerReexec is the re-exec entry point for writing a layer from a tar file
|
|
func writeLayerReexec() {
|
|
size, err := writeLayer(os.Stdin, os.Args[1], os.Args[2], os.Args[3:]...)
|
|
if err != nil {
|
|
fmt.Fprint(os.Stderr, err)
|
|
os.Exit(1)
|
|
}
|
|
fmt.Fprint(os.Stdout, size)
|
|
}
|
|
|
|
// writeLayer writes a layer from a tar file.
|
|
func writeLayer(layerData io.Reader, home string, id string, parentLayerPaths ...string) (int64, error) {
|
|
err := winio.EnableProcessPrivileges([]string{winio.SeBackupPrivilege, winio.SeRestorePrivilege})
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
if noreexec {
|
|
defer func() {
|
|
if err := winio.DisableProcessPrivileges([]string{winio.SeBackupPrivilege, winio.SeRestorePrivilege}); err != nil {
|
|
// This should never happen, but just in case when in debugging mode.
|
|
// See https://github.com/docker/docker/pull/28002#discussion_r86259241 for rationale.
|
|
panic("Failed to disabled process privileges while in non re-exec mode")
|
|
}
|
|
}()
|
|
}
|
|
|
|
info := hcsshim.DriverInfo{
|
|
Flavour: filterDriver,
|
|
HomeDir: home,
|
|
}
|
|
|
|
w, err := hcsshim.NewLayerWriter(info, id, parentLayerPaths)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
size, err := writeLayerFromTar(layerData, w, filepath.Join(home, id))
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
err = w.Close()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
return size, nil
|
|
}
|
|
|
|
// resolveID computes the layerID information based on the given id.
|
|
func (d *Driver) resolveID(id string) (string, error) {
|
|
content, err := ioutil.ReadFile(filepath.Join(d.dir(id), "layerID"))
|
|
if os.IsNotExist(err) {
|
|
return id, nil
|
|
} else if err != nil {
|
|
return "", err
|
|
}
|
|
return string(content), nil
|
|
}
|
|
|
|
// setID stores the layerId in disk.
|
|
func (d *Driver) setID(id, altID string) error {
|
|
return ioutil.WriteFile(filepath.Join(d.dir(id), "layerId"), []byte(altID), 0600)
|
|
}
|
|
|
|
// getLayerChain returns the layer chain information.
|
|
func (d *Driver) getLayerChain(id string) ([]string, error) {
|
|
jPath := filepath.Join(d.dir(id), "layerchain.json")
|
|
content, err := ioutil.ReadFile(jPath)
|
|
if os.IsNotExist(err) {
|
|
return nil, nil
|
|
} else if err != nil {
|
|
return nil, fmt.Errorf("Unable to read layerchain file - %s", err)
|
|
}
|
|
|
|
var layerChain []string
|
|
err = json.Unmarshal(content, &layerChain)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Failed to unmarshall layerchain json - %s", err)
|
|
}
|
|
|
|
return layerChain, nil
|
|
}
|
|
|
|
// setLayerChain stores the layer chain information in disk.
|
|
func (d *Driver) setLayerChain(id string, chain []string) error {
|
|
content, err := json.Marshal(&chain)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to marshall layerchain json - %s", err)
|
|
}
|
|
|
|
jPath := filepath.Join(d.dir(id), "layerchain.json")
|
|
err = ioutil.WriteFile(jPath, content, 0600)
|
|
if err != nil {
|
|
return fmt.Errorf("Unable to write layerchain file - %s", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
type fileGetCloserWithBackupPrivileges struct {
|
|
path string
|
|
}
|
|
|
|
func (fg *fileGetCloserWithBackupPrivileges) Get(filename string) (io.ReadCloser, error) {
|
|
if backupPath, ok := mutatedFiles[filename]; ok {
|
|
return os.Open(filepath.Join(fg.path, backupPath))
|
|
}
|
|
|
|
var f *os.File
|
|
// Open the file while holding the Windows backup privilege. This ensures that the
|
|
// file can be opened even if the caller does not actually have access to it according
|
|
// to the security descriptor. Also use sequential file access to avoid depleting the
|
|
// standby list - Microsoft VSO Bug Tracker #9900466
|
|
err := winio.RunWithPrivilege(winio.SeBackupPrivilege, func() error {
|
|
path := longpath.AddPrefix(filepath.Join(fg.path, filename))
|
|
p, err := windows.UTF16FromString(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
const fileFlagSequentialScan = 0x08000000 // FILE_FLAG_SEQUENTIAL_SCAN
|
|
h, err := windows.CreateFile(&p[0], windows.GENERIC_READ, windows.FILE_SHARE_READ, nil, windows.OPEN_EXISTING, windows.FILE_FLAG_BACKUP_SEMANTICS|fileFlagSequentialScan, 0)
|
|
if err != nil {
|
|
return &os.PathError{Op: "open", Path: path, Err: err}
|
|
}
|
|
f = os.NewFile(uintptr(h), path)
|
|
return nil
|
|
})
|
|
return f, err
|
|
}
|
|
|
|
func (fg *fileGetCloserWithBackupPrivileges) Close() error {
|
|
return nil
|
|
}
|
|
|
|
// DiffGetter returns a FileGetCloser that can read files from the directory that
|
|
// contains files for the layer differences. Used for direct access for tar-split.
|
|
func (d *Driver) DiffGetter(id string) (graphdriver.FileGetCloser, error) {
|
|
id, err := d.resolveID(id)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &fileGetCloserWithBackupPrivileges{d.dir(id)}, nil
|
|
}
|
|
|
|
type storageOptions struct {
|
|
size uint64
|
|
}
|
|
|
|
func parseStorageOpt(storageOpt map[string]string) (*storageOptions, error) {
|
|
options := storageOptions{}
|
|
|
|
// Read size to change the block device size per container.
|
|
for key, val := range storageOpt {
|
|
key := strings.ToLower(key)
|
|
switch key {
|
|
case "size":
|
|
size, err := units.RAMInBytes(val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
options.size = uint64(size)
|
|
}
|
|
}
|
|
return &options, nil
|
|
}
|