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moby--moby/daemon/initlayer/setup_unix.go
Christopher Jones 069fdc8a08
[project] change syscall to /x/sys/unix|windows
Changes most references of syscall to golang.org/x/sys/
Ones aren't changes include, Errno, Signal and SysProcAttr
as they haven't been implemented in /x/sys/.

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>

[s390x] switch utsname from unsigned to signed

per 33267e036f
char in s390x in the /x/sys/unix package is now signed, so
change the buildtags

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>
2017-07-11 08:00:32 -04:00

69 lines
1.8 KiB
Go

// +build linux freebsd
package initlayer
import (
"os"
"path/filepath"
"strings"
"github.com/docker/docker/pkg/idtools"
"golang.org/x/sys/unix"
)
// Setup populates a directory with mountpoints suitable
// for bind-mounting things into the container.
//
// This extra layer is used by all containers as the top-most ro layer. It protects
// the container from unwanted side-effects on the rw layer.
func Setup(initLayer string, rootIDs idtools.IDPair) error {
for pth, typ := range map[string]string{
"/dev/pts": "dir",
"/dev/shm": "dir",
"/proc": "dir",
"/sys": "dir",
"/.dockerenv": "file",
"/etc/resolv.conf": "file",
"/etc/hosts": "file",
"/etc/hostname": "file",
"/dev/console": "file",
"/etc/mtab": "/proc/mounts",
} {
parts := strings.Split(pth, "/")
prev := "/"
for _, p := range parts[1:] {
prev = filepath.Join(prev, p)
unix.Unlink(filepath.Join(initLayer, prev))
}
if _, err := os.Stat(filepath.Join(initLayer, pth)); err != nil {
if os.IsNotExist(err) {
if err := idtools.MkdirAllAndChownNew(filepath.Join(initLayer, filepath.Dir(pth)), 0755, rootIDs); err != nil {
return err
}
switch typ {
case "dir":
if err := idtools.MkdirAllAndChownNew(filepath.Join(initLayer, pth), 0755, rootIDs); err != nil {
return err
}
case "file":
f, err := os.OpenFile(filepath.Join(initLayer, pth), os.O_CREATE, 0755)
if err != nil {
return err
}
f.Chown(rootIDs.UID, rootIDs.GID)
f.Close()
default:
if err := os.Symlink(typ, filepath.Join(initLayer, pth)); err != nil {
return err
}
}
} else {
return err
}
}
}
// Layer is ready to use, if it wasn't before.
return nil
}