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Merge pull request #4448 from alexlarsson/pivot_root

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libcontainer: Use pivot_root instead of chroot
This commit is contained in:
unclejack 2014-03-04 19:59:16 +02:00
commit ba8d8f0abb
1 changed files with 18 additions and 4 deletions
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22
pkg/libcontainer/nsinit/mount.go
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@ -5,6 +5,7 @@ package nsinit
import (
"fmt"
"github.com/dotcloud/docker/pkg/system"
"io/ioutil"
"os"
"path/filepath"
"syscall"
@ -51,16 +52,29 @@ func setupNewMountNamespace(rootfs, console string, readonly bool) error {
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err)
}
if err := system.Mount(rootfs, "/", "", syscall.MS_MOVE, ""); err != nil {
return fmt.Errorf("mount move %s into / %s", rootfs, err)
pivotDir, err := ioutil.TempDir(rootfs, ".pivot_root")
if err != nil {
return fmt.Errorf("can't create pivot_root dir %s", pivotDir, err)
}
if err := system.Chroot("."); err != nil {
return fmt.Errorf("chroot . %s", err)
if err := system.Pivotroot(rootfs, pivotDir); err != nil {
return fmt.Errorf("pivot_root %s", err)
}
if err := system.Chdir("/"); err != nil {
return fmt.Errorf("chdir / %s", err)
}
// path to pivot dir now changed, update
pivotDir = filepath.Join("/", filepath.Base(pivotDir))
if err := system.Unmount(pivotDir, syscall.MNT_DETACH); err != nil {
return fmt.Errorf("unmount pivot_root dir %s", err)
}
if err := os.Remove(pivotDir); err != nil {
return fmt.Errorf("remove pivot_root dir %s", err)
}
system.Umask(0022)
return nil