// Setup initializes the proper /dev/console inside the rootfs path
func Setup(rootfs, consolePath, mountLabel string) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
if err := os.Chmod(consolePath, 0600); err != nil {
return err
}
if err := os.Chown(consolePath, 0, 0); err != nil {
return err
}
if err := label.SetFileLabel(consolePath, mountLabel); err != nil {
return fmt.Errorf("set file label %s %s", consolePath, err)
}
dest := filepath.Join(rootfs, "dev/console")
f, err := os.Create(dest)
if err != nil && !os.IsExist(err) {
return fmt.Errorf("create %s %s", dest, err)
}
if f != nil {
f.Close()
}
if err := system.Mount(consolePath, dest, "bind", syscall.MS_BIND, ""); err != nil {
return fmt.Errorf("bind %s to %s %s", consolePath, dest, err)
}
return nil
}
// setupConsole ensures that the container has a proper /dev/console setup
func setupConsole(rootfs, console string) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
stat, err := os.Stat(console)
if err != nil {
return fmt.Errorf("stat console %s %s", console, err)
}
var (
st = stat.Sys().(*syscall.Stat_t)
dest = filepath.Join(rootfs, "dev/console")
)
if err := os.Remove(dest); err != nil && !os.IsNotExist(err) {
return fmt.Errorf("remove %s %s", dest, err)
}
if err := os.Chmod(console, 0600); err != nil {
return err
}
if err := os.Chown(console, 0, 0); err != nil {
return err
}
if err := system.Mknod(dest, (st.Mode&^07777)|0600, int(st.Rdev)); err != nil {
return fmt.Errorf("mknod %s %s", dest, err)
}
if err := system.Mount(console, dest, "bind", syscall.MS_BIND, ""); err != nil {
return fmt.Errorf("bind %s to %s %s", console, dest, err)
}
return nil
}
// Setup initializes the proper /dev/console inside the rootfs path
func Setup(rootfs, consolePath, mountLabel string) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
stat, err := os.Stat(consolePath)
if err != nil {
return fmt.Errorf("stat console %s %s", consolePath, err)
}
var (
st = stat.Sys().(*syscall.Stat_t)
dest = filepath.Join(rootfs, "dev/console")
)
if err := os.Remove(dest); err != nil && !os.IsNotExist(err) {
return fmt.Errorf("remove %s %s", dest, err)
}
if err := os.Chmod(consolePath, 0600); err != nil {
return err
}
if err := os.Chown(consolePath, 0, 0); err != nil {
return err
}
if err := system.Mknod(dest, (st.Mode&^07777)|0600, int(st.Rdev)); err != nil {
return fmt.Errorf("mknod %s %s", dest, err)
}
if err := label.SetFileLabel(consolePath, mountLabel); err != nil {
return fmt.Errorf("set file label %s %s", dest, err)
}
return nil
}
// CopyN copies the device node from the host into the rootfs
func CopyN(rootfs string, nodesToCopy []string) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
for _, node := range nodesToCopy {
if err := Copy(rootfs, node); err != nil {
return err
}
}
return nil
}
// Create the device nodes in the container.
func CreateDeviceNodes(rootfs string, nodesToCreate []*devices.Device) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
for _, node := range nodesToCreate {
if err := CreateDeviceNode(rootfs, node); err != nil {
return err
}
}
return nil
}
// setupNewMountNamespace is used to initialize a new mount namespace for an new
// container in the rootfs that is specified.
//
// There is no need to unmount the new mounts because as soon as the mount namespace
// is no longer in use, the mounts will be removed automatically
func setupNewMountNamespace(rootfs, console string, readonly bool) error {
// mount as slave so that the new mounts do not propagate to the host
if err := system.Mount("", "/", "", syscall.MS_SLAVE|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mounting / as slave %s", err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if readonly {
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REMOUNT|syscall.MS_RDONLY|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mounting %s as readonly %s", rootfs, err)
}
}
if err := mountSystem(rootfs); err != nil {
return fmt.Errorf("mount system %s", err)
}
if err := copyDevNodes(rootfs); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
// In non-privileged mode, this fails. Discard the error.
setupLoopbackDevices(rootfs)
if err := setupDev(rootfs); err != nil {
return err
}
if console != "" {
if err := setupPtmx(rootfs, console); err != nil {
return err
}
}
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %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.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
}
// copyDevNodes mknods the hosts devices so the new container has access to them
func copyDevNodes(rootfs string) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
for _, node := range []string{
"null",
"zero",
"full",
"random",
"urandom",
"tty",
} {
if err := copyDevNode(rootfs, node); err != nil {
return err
}
}
return nil
}
// InitializeMountNamespace setups up the devices, mount points, and filesystems for use inside a
// new mount namepsace
func InitializeMountNamespace(rootfs, console string, container *libcontainer.Container) error {
var (
err error
flag = syscall.MS_PRIVATE
)
if container.NoPivotRoot {
flag = syscall.MS_SLAVE
}
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
return fmt.Errorf("mounting / with flags %X %s", (flag | syscall.MS_REC), err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if err := mountSystem(rootfs, container); err != nil {
return fmt.Errorf("mount system %s", err)
}
if err := setupBindmounts(rootfs, container.Mounts); err != nil {
return fmt.Errorf("bind mounts %s", err)
}
if err := nodes.CopyN(rootfs, nodes.DefaultNodes, true); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
if err := nodes.CopyN(rootfs, nodes.AdditionalNodes, false); err != nil {
return fmt.Errorf("copy additional dev nodes %s", err)
}
if err := SetupPtmx(rootfs, console, container.Context["mount_label"]); err != nil {
return err
}
if err := setupDevSymlinks(rootfs); err != nil {
return fmt.Errorf("dev symlinks %s", err)
}
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err)
}
if container.NoPivotRoot {
err = MsMoveRoot(rootfs)
} else {
err = PivotRoot(rootfs)
}
if err != nil {
return err
}
if container.ReadonlyFs {
if err := SetReadonly(); err != nil {
return fmt.Errorf("set readonly %s", err)
}
}
system.Umask(0022)
return nil
}
// InitializeMountNamespace setups up the devices, mount points, and filesystems for use inside a
// new mount namepsace
func InitializeMountNamespace(rootfs, console string, container *libcontainer.Container) error {
var (
err error
flag = syscall.MS_PRIVATE
)
if container.NoPivotRoot {
flag = syscall.MS_SLAVE
}
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
return fmt.Errorf("mounting / as slave %s", err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if err := mountSystem(rootfs, container); err != nil {
return fmt.Errorf("mount system %s", err)
}
if err := setupBindmounts(rootfs, container.Mounts); err != nil {
return fmt.Errorf("bind mounts %s", err)
}
if err := nodes.CopyN(rootfs, nodes.DefaultNodes); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
if restrictionPath := container.Context["restriction_path"]; restrictionPath != "" {
if err := restrict.Restrict(rootfs, restrictionPath); err != nil {
return fmt.Errorf("restrict %s", err)
}
}
if err := SetupPtmx(rootfs, console, container.Context["mount_label"]); err != nil {
return err
}
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err)
}
if container.NoPivotRoot {
err = MsMoveRoot(rootfs)
} else {
err = PivotRoot(rootfs)
}
if err != nil {
return err
}
if container.ReadonlyFs {
if err := SetReadonly(); err != nil {
return fmt.Errorf("set readonly %s", err)
}
}
system.Umask(0022)
return nil
}
// InitializeMountNamespace sets up the devices, mount points, and filesystems for use inside a
// new mount namespace.
func InitializeMountNamespace(rootfs, console string, mountConfig *MountConfig) error {
var (
err error
flag = syscall.MS_PRIVATE
)
if mountConfig.NoPivotRoot {
flag = syscall.MS_SLAVE
}
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
return fmt.Errorf("mounting / with flags %X %s", (flag | syscall.MS_REC), err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if err := mountSystem(rootfs, mountConfig); err != nil {
return fmt.Errorf("mount system %s", err)
}
if err := setupBindmounts(rootfs, mountConfig); err != nil {
return fmt.Errorf("bind mounts %s", err)
}
if err := nodes.CreateDeviceNodes(rootfs, mountConfig.DeviceNodes); err != nil {
return fmt.Errorf("create device nodes %s", err)
}
if err := SetupPtmx(rootfs, console, mountConfig.MountLabel); err != nil {
return err
}
if err := setupDevSymlinks(rootfs); err != nil {
return fmt.Errorf("dev symlinks %s", err)
}
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err)
}
if mountConfig.NoPivotRoot {
err = MsMoveRoot(rootfs)
} else {
err = PivotRoot(rootfs)
}
if err != nil {
return err
}
if mountConfig.ReadonlyFs {
if err := SetReadonly(); err != nil {
return fmt.Errorf("set readonly %s", err)
}
}
system.Umask(0022)
return nil
}
// setupNewMountNamespace is used to initialize a new mount namespace for an new
// container in the rootfs that is specified.
//
// There is no need to unmount the new mounts because as soon as the mount namespace
// is no longer in use, the mounts will be removed automatically
func setupNewMountNamespace(rootfs, console string, readonly, noPivotRoot bool) error {
flag := syscall.MS_PRIVATE
if noPivotRoot {
flag = syscall.MS_SLAVE
}
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
return fmt.Errorf("mounting / as slave %s", err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if readonly {
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REMOUNT|syscall.MS_RDONLY|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mounting %s as readonly %s", rootfs, err)
}
}
if err := mountSystem(rootfs); err != nil {
return fmt.Errorf("mount system %s", err)
}
if err := copyDevNodes(rootfs); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
// In non-privileged mode, this fails. Discard the error.
setupLoopbackDevices(rootfs)
if err := setupDev(rootfs); err != nil {
return err
}
if console != "" {
if err := setupPtmx(rootfs, console); err != nil {
return err
}
}
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err)
}
if noPivotRoot {
if err := rootMsMove(rootfs); err != nil {
return err
}
} else {
if err := rootPivot(rootfs); err != nil {
return err
}
}
system.Umask(0022)
return nil
}
// setupNewMountNamespace is used to initialize a new mount namespace for an new
// container in the rootfs that is specified.
//
// There is no need to unmount the new mounts because as soon as the mount namespace
// is no longer in use, the mounts will be removed automatically
func setupNewMountNamespace(rootfs, console string, readonly bool) error {
// mount as slave so that the new mounts do not propagate to the host
if err := system.Mount("", "/", "", syscall.MS_SLAVE|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mounting / as slave %s", err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if readonly {
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REMOUNT|syscall.MS_RDONLY|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mounting %s as readonly %s", rootfs, err)
}
}
if err := mountSystem(rootfs); err != nil {
return fmt.Errorf("mount system %s", err)
}
if err := copyDevNodes(rootfs); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
// In non-privileged mode, this fails. Discard the error.
setupLoopbackDevices(rootfs)
if err := setupDev(rootfs); err != nil {
return err
}
if console != "" {
if err := setupPtmx(rootfs, console); err != nil {
return err
}
}
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)
}
if err := system.Chroot("."); err != nil {
return fmt.Errorf("chroot . %s", err)
}
if err := system.Chdir("/"); err != nil {
return fmt.Errorf("chdir / %s", err)
}
system.Umask(0022)
return nil
}
// setupNewMountNamespace is used to initialize a new mount namespace for an new
// container in the rootfs that is specified.
//
// There is no need to unmount the new mounts because as soon as the mount namespace
// is no longer in use, the mounts will be removed automatically
func setupNewMountNamespace(rootfs string, bindMounts []libcontainer.Mount, console string, readonly, noPivotRoot bool, mountLabel string) error {
flag := syscall.MS_PRIVATE
if noPivotRoot {
flag = syscall.MS_SLAVE
}
if err := system.Mount("", "/", "", uintptr(flag|syscall.MS_REC), ""); err != nil {
return fmt.Errorf("mounting / as slave %s", err)
}
if err := system.Mount(rootfs, rootfs, "bind", syscall.MS_BIND|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mouting %s as bind %s", rootfs, err)
}
if err := mountSystem(rootfs, mountLabel); err != nil {
return fmt.Errorf("mount system %s", err)
}
for _, m := range bindMounts {
flags := syscall.MS_BIND | syscall.MS_REC
if !m.Writable {
flags = flags | syscall.MS_RDONLY
}
dest := filepath.Join(rootfs, m.Destination)
if err := system.Mount(m.Source, dest, "bind", uintptr(flags), ""); err != nil {
return fmt.Errorf("mounting %s into %s %s", m.Source, dest, err)
}
if m.Private {
if err := system.Mount("", dest, "none", uintptr(syscall.MS_PRIVATE), ""); err != nil {
return fmt.Errorf("mounting %s private %s", dest, err)
}
}
}
if err := copyDevNodes(rootfs); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
// In non-privileged mode, this fails. Discard the error.
setupLoopbackDevices(rootfs)
if err := setupPtmx(rootfs, console, mountLabel); err != nil {
return err
}
if err := system.Chdir(rootfs); err != nil {
return fmt.Errorf("chdir into %s %s", rootfs, err)
}
if noPivotRoot {
if err := rootMsMove(rootfs); err != nil {
return err
}
} else {
if err := rootPivot(rootfs); err != nil {
return err
}
}
if readonly {
if err := system.Mount("/", "/", "bind", syscall.MS_BIND|syscall.MS_REMOUNT|syscall.MS_RDONLY|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("mounting %s as readonly %s", rootfs, err)
}
}
system.Umask(0022)
return nil
}