mirror of
https://github.com/moby/moby.git
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118 lines
2.3 KiB
Go
118 lines
2.3 KiB
Go
package vfs
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import (
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"bytes"
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"fmt"
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"os"
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"os/exec"
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"path"
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"github.com/docker/docker/daemon/graphdriver"
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"github.com/docker/libcontainer/label"
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)
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func init() {
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graphdriver.Register("vfs", Init)
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}
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func Init(home string, options []string) (graphdriver.Driver, error) {
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d := &Driver{
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home: home,
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}
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return graphdriver.NaiveDiffDriver(d), nil
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}
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type Driver struct {
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home string
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}
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func (d *Driver) String() string {
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return "vfs"
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}
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func (d *Driver) Status() [][2]string {
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return nil
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}
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func (d *Driver) Cleanup() error {
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return nil
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}
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func isGNUcoreutils() bool {
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if stdout, err := exec.Command("cp", "--version").Output(); err == nil {
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return bytes.Contains(stdout, []byte("GNU coreutils"))
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}
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return false
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}
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func copyDir(src, dst string) error {
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argv := make([]string, 0, 4)
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if isGNUcoreutils() {
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argv = append(argv, "-aT", "--reflink=auto", src, dst)
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} else {
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argv = append(argv, "-a", src+"/.", dst+"/.")
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}
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if output, err := exec.Command("cp", argv...).CombinedOutput(); err != nil {
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return fmt.Errorf("Error VFS copying directory: %s (%s)", err, output)
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}
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return nil
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}
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func (d *Driver) Create(id, parent string) error {
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dir := d.dir(id)
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if err := os.MkdirAll(path.Dir(dir), 0700); err != nil {
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return err
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}
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if err := os.Mkdir(dir, 0755); err != nil {
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return err
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}
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opts := []string{"level:s0"}
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if _, mountLabel, err := label.InitLabels(opts); err == nil {
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label.Relabel(dir, mountLabel, "")
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}
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if parent == "" {
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return nil
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}
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parentDir, err := d.Get(parent, "")
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if err != nil {
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return fmt.Errorf("%s: %s", parent, err)
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}
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if err := copyDir(parentDir, dir); err != nil {
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return err
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}
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return nil
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}
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func (d *Driver) dir(id string) string {
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return path.Join(d.home, "dir", path.Base(id))
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}
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func (d *Driver) Remove(id string) error {
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if _, err := os.Stat(d.dir(id)); err != nil {
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return err
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}
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return os.RemoveAll(d.dir(id))
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}
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func (d *Driver) Get(id, mountLabel string) (string, error) {
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dir := d.dir(id)
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if st, err := os.Stat(dir); err != nil {
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return "", err
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} else if !st.IsDir() {
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return "", fmt.Errorf("%s: not a directory", dir)
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}
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return dir, nil
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}
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func (d *Driver) Put(id string) {
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// The vfs driver has no runtime resources (e.g. mounts)
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// to clean up, so we don't need anything here
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}
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func (d *Driver) Exists(id string) bool {
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_, err := os.Stat(d.dir(id))
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return err == nil
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}
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