Added mount/umount messages; readonly flag for oz-mount

oz-daemon/client.go

@@ -102,6 +102,36 @@ func KillSandbox(id int) error {
 	}
 }
 
+func MountFiles(files []string) (error) {
+	resp, err := clientSend(&MountFilesMsg{Files: files})
+	if err != nil {
+		return err
+	}
+	switch body := resp.Body.(type) {
+	case *ErrorMsg:
+		return errors.New(body.Msg)
+	case *OkMsg:
+		return nil
+	default:
+		return fmt.Errorf("Unexpected message received %+v", body)
+	}
+}
+
+func UnmountFile(file string) (error) {
+	resp, err := clientSend(&UnmountFileMsg{File: file})
+	if err != nil {
+		return err
+	}
+	switch body := resp.Body.(type) {
+	case *ErrorMsg:
+		return errors.New(body.Msg)
+	case *OkMsg:
+		return nil
+	default:
+		return fmt.Errorf("Unexpected message received %+v", body)
+	}
+}
+
 func parseProfileArg(arg string) (int, string, error) {
 	if len(arg) == 0 {
 		return 0, "", errors.New("profile argument needed")

oz-daemon/daemon.go

@@ -37,6 +37,8 @@ func Main() {
 		d.handleLaunch,
 		d.handleListSandboxes,
 		d.handleKillSandbox,
+		d.handleMountFiles,
+		d.handleUnmountFile,
 		d.handleLogs,
 	)
 	if err != nil {
@@ -257,6 +259,31 @@ func (d *daemonState) handleKillSandbox(msg *KillSandboxMsg, m *ipc.Message) err
 	return m.Respond(&OkMsg{})
 }
 
+func (d *daemonState) handleMountFiles(msg *MountFilesMsg, m *ipc.Message) error {
+	sbox := d.sandboxById(msg.Id)
+	if sbox == nil {
+		return m.Respond(&ErrorMsg{fmt.Sprintf("no sandbox found with id = %d", msg.Id)})
+	}
+	if err := sbox.MountFiles(msg.Files, msg.ReadOnly, d.config.PrefixPath, d.log); err != nil {
+		return m.Respond(&ErrorMsg{fmt.Sprintf("Unable to unmount file `%+s` from sandbox `%s`: %v", msg.Files, sbox.profile.Name, err)})
+	}
+	return m.Respond(&OkMsg{})
+}
+
+
+func (d *daemonState) handleUnmountFile(msg *UnmountFileMsg, m *ipc.Message) error {
+	sbox := d.sandboxById(msg.Id)
+	if sbox == nil {
+		return m.Respond(&ErrorMsg{fmt.Sprintf("no sandbox found with id = %d", msg.Id)})
+	}
+	if err := sbox.UnmountFile(msg.File, d.config.PrefixPath, d.log); err != nil {
+		return m.Respond(&ErrorMsg{fmt.Sprintf("Unable to unmount file `%s` from sandbox `%s`: %v", msg.File, sbox.profile.Name, err)})
+	}
+	return m.Respond(&OkMsg{})
+}
+
+
+
 func (d *daemonState) sandboxById(id int) *Sandbox {
 	for _, sb := range d.sandboxes {
 		if sb.id == id {
@@ -317,7 +344,7 @@ func (d *daemonState) getRunningSandboxByName(name string) *Sandbox {
 func (d *daemonState) handleListSandboxes(list *ListSandboxesMsg, msg *ipc.Message) error {
 	r := new(ListSandboxesResp)
 	for _, sb := range d.sandboxes {
-		r.Sandboxes = append(r.Sandboxes, SandboxInfo{Id: sb.id, Address: sb.addr, Profile: sb.profile.Name})
+		r.Sandboxes = append(r.Sandboxes, SandboxInfo{Id: sb.id, Address: sb.addr, Mounts: sb.mountedFiles, Profile: sb.profile.Name})
 	}
 	return msg.Respond(r)
 }

oz-daemon/launch.go

@@ -38,6 +38,7 @@ type Sandbox struct {
 	xpra         *xpra.Xpra
 	ready        sync.WaitGroup
 	network      *network.SandboxNetwork
+	mountedFiles []string
 }
 
 func createSocketPath(base string) (string, error) {
@@ -208,6 +209,56 @@ func (sbox *Sandbox) launchProgram(binpath, cpath, pwd string, args []string, lo
 	}
 }
 
+func (sbox *Sandbox) MountFiles(files []string, readonly bool,  binpath string, log *logging.Logger) error {
+	pmnt := path.Join(binpath, "bin", "oz-mount")
+	args := files
+	if readonly {
+		args = append([]string{"--readonly"}, files...)
+	}
+	cmnt := exec.Command(pmnt, args...)
+	cmnt.Env = []string{"_OZ_NSPID=" + strconv.Itoa(sbox.init.Process.Pid)}
+	pout, err := cmnt.CombinedOutput()
+	if err != nil {
+		log.Warning("Unable to bind files to sandbox: %v", err)
+		log.Warning("%s", string(pout))
+		return err
+	}
+	for _, mfile := range files {
+		found := false
+		for _, mmfile := range sbox.mountedFiles {
+			if (mfile == mmfile) {
+				found = true
+				break;
+			}
+		}
+		if (!found) {
+			sbox.mountedFiles = append(sbox.mountedFiles, mfile)
+		}
+	}
+	log.Info("%s", string(pout))
+	return nil
+}
+
+
+func (sbox *Sandbox) UnmountFile(file, binpath string, log *logging.Logger) error {
+	pmnt := path.Join(binpath, "bin", "oz-umount")
+	cmnt := exec.Command(pmnt, file)
+	cmnt.Env = []string{"_OZ_NSPID=" + strconv.Itoa(sbox.init.Process.Pid)}
+	pout, err := cmnt.CombinedOutput()
+	if err != nil {
+		log.Warning("Unable to unbind files from sandbox: %v", err)
+		log.Warning("%s", string(pout))
+		return err
+	}
+	for i, item := range sbox.mountedFiles {
+		if item == file {
+			sbox.mountedFiles = append(sbox.mountedFiles[:i], sbox.mountedFiles[i+1:]...)
+		}
+	}
+	log.Info("%s", string(pout))
+	return nil
+}
+
 func (sbox *Sandbox) whitelistArgumentFiles(binpath, pwd string, args []string, log *logging.Logger) {
 	var files []string
 	for _, fpath := range args {
@@ -223,14 +274,7 @@ func (sbox *Sandbox) whitelistArgumentFiles(binpath, pwd string, args []string,
 		}
 	}
 	if len(files) > 0 {
-		pmnt := path.Join(binpath, "bin", "oz-mount")
-		cmnt := exec.Command(pmnt, files...)
-		cmnt.Env = []string{"_OZ_NSPID=" + strconv.Itoa(sbox.init.Process.Pid)}
-		pout, err := cmnt.CombinedOutput()
-		if err != nil {
-			log.Warning("Unable to bind files to sandbox: %v", err)
-			log.Warning("%s", string(pout))
-		}
+		sbox.MountFiles(files, false, binpath, log);
 	}
 }
 

oz-daemon/protocol.go

@@ -48,6 +48,7 @@ type SandboxInfo struct {
 	Id      int
 	Address string
 	Profile string
+	Mounts  []string
 }
 
 type ListSandboxesResp struct {
@@ -58,6 +59,17 @@ type KillSandboxMsg struct {
 	Id int "KillSandbox"
 }
 
+type MountFilesMsg struct {
+	Id int "MountFiles"
+	Files []string
+	ReadOnly bool
+}
+
+type UnmountFileMsg struct {
+	Id int "UnmountFile"
+	File string
+}
+
 type LogsMsg struct {
 	Count  int "Logs"
 	Follow bool
@@ -77,6 +89,8 @@ var messageFactory = ipc.NewMsgFactory(
 	new(ListSandboxesMsg),
 	new(ListSandboxesResp),
 	new(KillSandboxMsg),
+	new(MountFilesMsg),
+	new(UnmountFileMsg),
 	new(LogsMsg),
 	new(LogData),
 )

oz-mount/mount.go

@@ -37,17 +37,20 @@ func Main(mode int) {
 	}
 
 	fsys := fs.NewFilesystem(config, log)
-	for fii, fpath := range os.Args {
-		if fii == 0 {
-			continue
+	start := 1;
+	readonly := false;
+	if os.Args[1] == "--readonly" {
+		start = 2;
+		readonly = true;
 	}
+	for _, fpath := range os.Args[start:] {
 		if !strings.HasPrefix(fpath, "/home/") {
 			log.Warning("Ignored `%s`, only files inside of home are permitted!", fpath)
 			continue
 		}
 		switch mode {
 		case MOUNT:
-			mount(fpath, fsys, log)
+			mount(fpath, readonly, fsys, log)
 		case UMOUNT:
 			unmount(fpath, fsys, log)
 		}
@@ -56,10 +59,14 @@ func Main(mode int) {
 	os.Exit(0)
 }
 
-func mount(fpath string, fsys *fs.Filesystem, log *logging.Logger) {
+func mount(fpath string, readonly bool, fsys *fs.Filesystem, log *logging.Logger) {
 	if _, err := os.Stat(fpath); err == nil {
 		//log.Notice("Adding file `%s`.", fpath)
-		if err := fsys.BindPath(fpath, fs.BindCanCreate, nil); err != nil {
+		flags := fs.BindCanCreate
+		if readonly {
+			flags |= fs.BindReadOnly
+		}
+		if err := fsys.BindPath(fpath, flags, nil); err != nil {
 			log.Error("%v while adding `%s`!", err, fpath)
 			os.Exit(1)
 		}