mirror of
https://github.com/genuinetools/reg.git
synced 2024-08-21 14:20:23 -04:00
236 lines
7.3 KiB
Go
236 lines
7.3 KiB
Go
// +build !windows
|
|
|
|
package daemon // import "github.com/docker/docker/daemon"
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"os"
|
|
"path/filepath"
|
|
"sort"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/docker/docker/container"
|
|
"github.com/docker/docker/pkg/fileutils"
|
|
"github.com/docker/docker/pkg/mount"
|
|
"github.com/docker/docker/volume"
|
|
"github.com/docker/docker/volume/drivers"
|
|
"github.com/docker/docker/volume/local"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
// setupMounts iterates through each of the mount points for a container and
|
|
// calls Setup() on each. It also looks to see if is a network mount such as
|
|
// /etc/resolv.conf, and if it is not, appends it to the array of mounts.
|
|
func (daemon *Daemon) setupMounts(c *container.Container) ([]container.Mount, error) {
|
|
var mounts []container.Mount
|
|
// TODO: tmpfs mounts should be part of Mountpoints
|
|
tmpfsMounts := make(map[string]bool)
|
|
tmpfsMountInfo, err := c.TmpfsMounts()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, m := range tmpfsMountInfo {
|
|
tmpfsMounts[m.Destination] = true
|
|
}
|
|
for _, m := range c.MountPoints {
|
|
if tmpfsMounts[m.Destination] {
|
|
continue
|
|
}
|
|
if err := daemon.lazyInitializeVolume(c.ID, m); err != nil {
|
|
return nil, err
|
|
}
|
|
// If the daemon is being shutdown, we should not let a container start if it is trying to
|
|
// mount the socket the daemon is listening on. During daemon shutdown, the socket
|
|
// (/var/run/docker.sock by default) doesn't exist anymore causing the call to m.Setup to
|
|
// create at directory instead. This in turn will prevent the daemon to restart.
|
|
checkfunc := func(m *volume.MountPoint) error {
|
|
if _, exist := daemon.hosts[m.Source]; exist && daemon.IsShuttingDown() {
|
|
return fmt.Errorf("Could not mount %q to container while the daemon is shutting down", m.Source)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
path, err := m.Setup(c.MountLabel, daemon.idMappings.RootPair(), checkfunc)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if !c.TrySetNetworkMount(m.Destination, path) {
|
|
mnt := container.Mount{
|
|
Source: path,
|
|
Destination: m.Destination,
|
|
Writable: m.RW,
|
|
Propagation: string(m.Propagation),
|
|
}
|
|
if m.Volume != nil {
|
|
attributes := map[string]string{
|
|
"driver": m.Volume.DriverName(),
|
|
"container": c.ID,
|
|
"destination": m.Destination,
|
|
"read/write": strconv.FormatBool(m.RW),
|
|
"propagation": string(m.Propagation),
|
|
}
|
|
daemon.LogVolumeEvent(m.Volume.Name(), "mount", attributes)
|
|
}
|
|
mounts = append(mounts, mnt)
|
|
}
|
|
}
|
|
|
|
mounts = sortMounts(mounts)
|
|
netMounts := c.NetworkMounts()
|
|
// if we are going to mount any of the network files from container
|
|
// metadata, the ownership must be set properly for potential container
|
|
// remapped root (user namespaces)
|
|
rootIDs := daemon.idMappings.RootPair()
|
|
for _, mount := range netMounts {
|
|
// we should only modify ownership of network files within our own container
|
|
// metadata repository. If the user specifies a mount path external, it is
|
|
// up to the user to make sure the file has proper ownership for userns
|
|
if strings.Index(mount.Source, daemon.repository) == 0 {
|
|
if err := os.Chown(mount.Source, rootIDs.UID, rootIDs.GID); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
}
|
|
return append(mounts, netMounts...), nil
|
|
}
|
|
|
|
// sortMounts sorts an array of mounts in lexicographic order. This ensure that
|
|
// when mounting, the mounts don't shadow other mounts. For example, if mounting
|
|
// /etc and /etc/resolv.conf, /etc/resolv.conf must not be mounted first.
|
|
func sortMounts(m []container.Mount) []container.Mount {
|
|
sort.Sort(mounts(m))
|
|
return m
|
|
}
|
|
|
|
// setBindModeIfNull is platform specific processing to ensure the
|
|
// shared mode is set to 'z' if it is null. This is called in the case
|
|
// of processing a named volume and not a typical bind.
|
|
func setBindModeIfNull(bind *volume.MountPoint) {
|
|
if bind.Mode == "" {
|
|
bind.Mode = "z"
|
|
}
|
|
}
|
|
|
|
// migrateVolume links the contents of a volume created pre Docker 1.7
|
|
// into the location expected by the local driver.
|
|
// It creates a symlink from DOCKER_ROOT/vfs/dir/VOLUME_ID to DOCKER_ROOT/volumes/VOLUME_ID/_container_data.
|
|
// It preserves the volume json configuration generated pre Docker 1.7 to be able to
|
|
// downgrade from Docker 1.7 to Docker 1.6 without losing volume compatibility.
|
|
func migrateVolume(id, vfs string) error {
|
|
l, err := volumedrivers.GetDriver(volume.DefaultDriverName)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
newDataPath := l.(*local.Root).DataPath(id)
|
|
fi, err := os.Stat(newDataPath)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
|
|
if fi != nil && fi.IsDir() {
|
|
return nil
|
|
}
|
|
|
|
return os.Symlink(vfs, newDataPath)
|
|
}
|
|
|
|
// verifyVolumesInfo ports volumes configured for the containers pre docker 1.7.
|
|
// It reads the container configuration and creates valid mount points for the old volumes.
|
|
func (daemon *Daemon) verifyVolumesInfo(container *container.Container) error {
|
|
container.Lock()
|
|
defer container.Unlock()
|
|
|
|
// Inspect old structures only when we're upgrading from old versions
|
|
// to versions >= 1.7 and the MountPoints has not been populated with volumes data.
|
|
type volumes struct {
|
|
Volumes map[string]string
|
|
VolumesRW map[string]bool
|
|
}
|
|
cfgPath, err := container.ConfigPath()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
f, err := os.Open(cfgPath)
|
|
if err != nil {
|
|
return errors.Wrap(err, "could not open container config")
|
|
}
|
|
defer f.Close()
|
|
var cv volumes
|
|
if err := json.NewDecoder(f).Decode(&cv); err != nil {
|
|
return errors.Wrap(err, "could not decode container config")
|
|
}
|
|
|
|
if len(container.MountPoints) == 0 && len(cv.Volumes) > 0 {
|
|
for destination, hostPath := range cv.Volumes {
|
|
vfsPath := filepath.Join(daemon.root, "vfs", "dir")
|
|
rw := cv.VolumesRW != nil && cv.VolumesRW[destination]
|
|
|
|
if strings.HasPrefix(hostPath, vfsPath) {
|
|
id := filepath.Base(hostPath)
|
|
v, err := daemon.volumes.CreateWithRef(id, volume.DefaultDriverName, container.ID, nil, nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := migrateVolume(id, hostPath); err != nil {
|
|
return err
|
|
}
|
|
container.AddMountPointWithVolume(destination, v, true)
|
|
} else { // Bind mount
|
|
m := volume.MountPoint{Source: hostPath, Destination: destination, RW: rw}
|
|
container.MountPoints[destination] = &m
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (daemon *Daemon) mountVolumes(container *container.Container) error {
|
|
mounts, err := daemon.setupMounts(container)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, m := range mounts {
|
|
dest, err := container.GetResourcePath(m.Destination)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var stat os.FileInfo
|
|
stat, err = os.Stat(m.Source)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err = fileutils.CreateIfNotExists(dest, stat.IsDir()); err != nil {
|
|
return err
|
|
}
|
|
|
|
opts := "rbind,ro"
|
|
if m.Writable {
|
|
opts = "rbind,rw"
|
|
}
|
|
|
|
if err := mount.Mount(m.Source, dest, bindMountType, opts); err != nil {
|
|
return err
|
|
}
|
|
|
|
// mountVolumes() seems to be called for temporary mounts
|
|
// outside the container. Soon these will be unmounted with
|
|
// lazy unmount option and given we have mounted the rbind,
|
|
// all the submounts will propagate if these are shared. If
|
|
// daemon is running in host namespace and has / as shared
|
|
// then these unmounts will propagate and unmount original
|
|
// mount as well. So make all these mounts rprivate.
|
|
// Do not use propagation property of volume as that should
|
|
// apply only when mounting happen inside the container.
|
|
if err := mount.MakeRPrivate(dest); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|