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125 lines
3.7 KiB
Go
125 lines
3.7 KiB
Go
// +build !windows
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package daemon
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import (
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"os"
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"sort"
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"strconv"
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"github.com/docker/docker/container"
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"github.com/docker/docker/daemon/execdriver"
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"github.com/docker/docker/volume"
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volumedrivers "github.com/docker/docker/volume/drivers"
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"github.com/docker/docker/volume/local"
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)
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// setupMounts iterates through each of the mount points for a container and
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// calls Setup() on each. It also looks to see if is a network mount such as
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// /etc/resolv.conf, and if it is not, appends it to the array of mounts.
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func (daemon *Daemon) setupMounts(container *container.Container) ([]execdriver.Mount, error) {
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var mounts []execdriver.Mount
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for _, m := range container.MountPoints {
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path, err := m.Setup()
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if err != nil {
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return nil, err
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}
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if !container.TrySetNetworkMount(m.Destination, path) {
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mnt := execdriver.Mount{
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Source: path,
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Destination: m.Destination,
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Writable: m.RW,
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Propagation: m.Propagation,
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}
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if m.Volume != nil {
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attributes := map[string]string{
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"driver": m.Volume.DriverName(),
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"container": container.ID,
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"destination": m.Destination,
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"read/write": strconv.FormatBool(m.RW),
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"propagation": m.Propagation,
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}
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daemon.LogVolumeEvent(m.Volume.Name(), "mount", attributes)
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}
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mounts = append(mounts, mnt)
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}
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}
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mounts = sortMounts(mounts)
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netMounts := container.NetworkMounts()
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// if we are going to mount any of the network files from container
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// metadata, the ownership must be set properly for potential container
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// remapped root (user namespaces)
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rootUID, rootGID := daemon.GetRemappedUIDGID()
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for _, mount := range netMounts {
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if err := os.Chown(mount.Source, rootUID, rootGID); err != nil {
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return nil, err
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}
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}
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return append(mounts, netMounts...), nil
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}
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// sortMounts sorts an array of mounts in lexicographic order. This ensure that
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// when mounting, the mounts don't shadow other mounts. For example, if mounting
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// /etc and /etc/resolv.conf, /etc/resolv.conf must not be mounted first.
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func sortMounts(m []execdriver.Mount) []execdriver.Mount {
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sort.Sort(mounts(m))
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return m
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}
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// migrateVolume links the contents of a volume created pre Docker 1.7
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// into the location expected by the local driver.
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// It creates a symlink from DOCKER_ROOT/vfs/dir/VOLUME_ID to DOCKER_ROOT/volumes/VOLUME_ID/_container_data.
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// It preserves the volume json configuration generated pre Docker 1.7 to be able to
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// downgrade from Docker 1.7 to Docker 1.6 without losing volume compatibility.
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func migrateVolume(id, vfs string) error {
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l, err := volumedrivers.Lookup(volume.DefaultDriverName)
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if err != nil {
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return err
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}
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newDataPath := l.(*local.Root).DataPath(id)
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fi, err := os.Stat(newDataPath)
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if err != nil && !os.IsNotExist(err) {
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return err
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}
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if fi != nil && fi.IsDir() {
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return nil
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}
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return os.Symlink(vfs, newDataPath)
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}
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// validVolumeLayout checks whether the volume directory layout
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// is valid to work with Docker post 1.7 or not.
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func validVolumeLayout(files []os.FileInfo) bool {
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if len(files) == 1 && files[0].Name() == local.VolumeDataPathName && files[0].IsDir() {
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return true
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}
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if len(files) != 2 {
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return false
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}
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for _, f := range files {
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if f.Name() == "config.json" ||
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(f.Name() == local.VolumeDataPathName && f.Mode()&os.ModeSymlink == os.ModeSymlink) {
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// Old volume configuration, we ignore it
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continue
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}
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return false
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}
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return true
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}
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// setBindModeIfNull is platform specific processing to ensure the
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// shared mode is set to 'z' if it is null. This is called in the case
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// of processing a named volume and not a typical bind.
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func setBindModeIfNull(bind *volume.MountPoint) *volume.MountPoint {
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if bind.Mode == "" {
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bind.Mode = "z"
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}
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return bind
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}
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