func setupRootfs(fsys *fs.Filesystem) error {
if err := os.MkdirAll(fsys.Root(), 0755); err != nil {
return fmt.Errorf("could not create rootfs path '%s': %v", fsys.Root(), err)
}
if err := syscall.Mount("", "/", "", syscall.MS_PRIVATE|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("failed to set MS_PRIVATE on '%s': %v", "/", err)
}
flags := uintptr(syscall.MS_NOSUID | syscall.MS_NOEXEC | syscall.MS_NODEV)
if err := syscall.Mount("", fsys.Root(), "tmpfs", flags, "mode=755,gid=0"); err != nil {
return fmt.Errorf("failed to mount tmpfs on '%s': %v", fsys.Root(), err)
}
if err := syscall.Mount("", fsys.Root(), "", syscall.MS_PRIVATE, ""); err != nil {
return fmt.Errorf("failed to set MS_PRIVATE on '%s': %v", fsys.Root(), err)
}
for _, p := range basicBindDirs {
if err := fsys.BindPath(p, fs.BindReadOnly, nil); err != nil {
return fmt.Errorf("failed to bind directory '%s': %v", p, err)
}
}
for _, p := range basicEmptyDirs {
if err := fsys.CreateEmptyDir(p); err != nil {
return fmt.Errorf("failed to create empty directory '%s': %v", p, err)
}
}
dp := path.Join(fsys.Root(), "dev")
if err := syscall.Mount("", dp, "tmpfs", syscall.MS_NOSUID|syscall.MS_NOEXEC, "mode=755"); err != nil {
return err
}
for _, d := range basicDevices {
if err := fsys.CreateDevice(d.path, d.dev, d.mode); err != nil {
return err
}
}
for _, sl := range append(basicSymlinks, deviceSymlinks...) {
if err := fsys.CreateSymlink(sl[0], sl[1]); err != nil {
return err
}
}
if err := fsys.CreateBlacklistPaths(); err != nil {
return err
}
for _, bl := range basicBlacklist {
if err := fsys.BlacklistPath(bl, nil); err != nil {
return err
}
}
return nil
}
func setupRootfs(fsys *fs.Filesystem, uid, gid uint32, useFullDev bool) error {
if err := os.MkdirAll(fsys.Root(), 0755); err != nil {
return fmt.Errorf("could not create rootfs path '%s': %v", fsys.Root(), err)
}
if err := syscall.Mount("", "/", "", syscall.MS_PRIVATE|syscall.MS_REC, ""); err != nil {
return fmt.Errorf("failed to set MS_PRIVATE on '%s': %v", "/", err)
}
flags := uintptr(syscall.MS_NOSUID | syscall.MS_NOEXEC | syscall.MS_NODEV)
if err := syscall.Mount("", fsys.Root(), "tmpfs", flags, "mode=755,gid=0"); err != nil {
return fmt.Errorf("failed to mount tmpfs on '%s': %v", fsys.Root(), err)
}
if err := syscall.Mount("", fsys.Root(), "", syscall.MS_PRIVATE, ""); err != nil {
return fmt.Errorf("failed to set MS_PRIVATE on '%s': %v", fsys.Root(), err)
}
for _, p := range basicBindDirs {
if err := fsys.BindPath(p, fs.BindReadOnly, nil); err != nil {
return fmt.Errorf("failed to bind directory '%s': %v", p, err)
}
}
for _, p := range basicEmptyDirs {
if err := fsys.CreateEmptyDir(p); err != nil {
return fmt.Errorf("failed to create empty directory '%s': %v", p, err)
}
}
rup := path.Join(fsys.Root(), "/run/user", strconv.FormatUint(uint64(uid), 10))
if err := os.MkdirAll(rup, 0700); err != nil {
return fmt.Errorf("failed to create user rundir: %v", err)
}
if err := os.Chown(rup, int(uid), int(gid)); err != nil {
return fmt.Errorf("failed to chiwn user rundir: %v", err)
}
dp := path.Join(fsys.Root(), "dev")
if err := syscall.Mount("", dp, "tmpfs", syscall.MS_NOSUID|syscall.MS_NOEXEC, "mode=755"); err != nil {
return err
}
if !useFullDev {
for _, d := range basicDevices {
if err := fsys.CreateDevice(d.path, d.dev, d.mode, d.gid); err != nil {
return err
}
}
}
tp := path.Join(fsys.Root(), "/tmp")
tflags := uintptr(syscall.MS_NODEV | syscall.MS_NOSUID | syscall.MS_NOEXEC | syscall.MS_REC)
if err := syscall.Mount("", tp, "tmpfs", tflags, "mode=777"); err != nil {
return err
}
for _, sl := range append(basicSymlinks, deviceSymlinks...) {
if err := fsys.CreateSymlink(sl[0], sl[1]); err != nil {
return err
}
}
if err := fsys.CreateBlacklistPaths(); err != nil {
return err
}
for _, bl := range basicBlacklist {
if err := fsys.BlacklistPath(bl, nil); err != nil {
return err
}
}
return nil
}