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Setup standard /dev symlinks

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After copying allowed device nodes, set up "/dev/fd", "/dev/stdin",
"/dev/stdout", and "/dev/stderr" symlinks.

Docker-DCO-1.1-Signed-off-by: Bernerd Schaefer <bj.schaefer@gmail.com> (github: bernerdschaefer)
[rebased by @crosbymichael]
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Bernerd Schaefer 2014-05-12 14:41:07 +02:00 committed by Michael Crosby
parent ceedff720e
commit 9133caa6d3
1 changed files with 31 additions and 0 deletions
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31
libcontainer/mount/init.go
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@ -54,6 +54,9 @@ func InitializeMountNamespace(rootfs, console string, container *libcontainer.Co
if err := SetupPtmx(rootfs, console, container.Context["mount_label"]); err != nil { if err := SetupPtmx(rootfs, console, container.Context["mount_label"]); err != nil {
return err return err
} }
if err := setupDevSymlinks(rootfs); err != nil {
return fmt.Errorf("dev symlinks %s", err)
}
if err := system.Chdir(rootfs); err != nil { if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err) return fmt.Errorf("chdir into %s %s", rootfs, err)
} }
@ -114,6 +117,34 @@ func createIfNotExists(path string, isDir bool) error {
return nil return nil
} }
func setupDevSymlinks(rootfs string) error {
var links = [][2]string{
{"/proc/self/fd", "/dev/fd"},
{"/proc/self/fd/0", "/dev/stdin"},
{"/proc/self/fd/1", "/dev/stdout"},
{"/proc/self/fd/2", "/dev/stderr"},
}
// kcore support can be toggled with CONFIG_PROC_KCORE; only create a symlink
// in /dev if it exists in /proc.
if _, err := os.Stat("/proc/kcore"); err == nil {
links = append(links, [2]string{"/proc/kcore", "/dev/kcore"})
}
for _, link := range links {
var (
src = link[0]
dst = filepath.Join(rootfs, link[1])
)
if err := os.Symlink(src, dst); err != nil && !os.IsExist(err) {
return fmt.Errorf("symlink %s %s %s", src, dst, err)
}
}
return nil
}
func setupBindmounts(rootfs string, bindMounts libcontainer.Mounts) error { func setupBindmounts(rootfs string, bindMounts libcontainer.Mounts) error {
for _, m := range bindMounts.OfType("bind") { for _, m := range bindMounts.OfType("bind") {
var ( var (