remote.mount saves the mapping

7 files changed, 254 insertions, 258 deletions

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 12f9a8505..efecc4e97 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -392,10 +392,6 @@ message RemoteConf {
     string s3_endpoint = 7;
 }
 
-message RemoteStorageMappingList {
-    repeated RemoteStorageMapping mappings = 1;
-}
 message RemoteStorageMapping {
-    string dir = 1;
-    string remote_storage_name = 2;
+    map<string,string> mappings = 1;
 }
diff --git a/weed/filer/filer_remote_storage.go b/weed/filer/filer_remote_storage.go
index dbb0363a5..f6f3adb22 100644
--- a/weed/filer/filer_remote_storage.go
+++ b/weed/filer/filer_remote_storage.go
@@ -60,12 +60,12 @@ func (rs *FilerRemoteStorage) loadRemoteStorageConfigurations(filer *Filer) (err
 }
 
 func (rs *FilerRemoteStorage) loadRemoteStorageMountMapping(data []byte) (err error) {
-	mappings := &filer_pb.RemoteStorageMappingList{}
+	mappings := &filer_pb.RemoteStorageMapping{}
 	if err := proto.Unmarshal(data, mappings); err != nil {
 		return fmt.Errorf("unmarshal %s/%s: %v", DirectoryEtcRemote, REMOTE_STORAGE_MOUNT_FILE, err)
 	}
-	for _, mapping := range mappings.Mappings {
-		rs.mapDirectoryToRemoteStorage(util.FullPath(mapping.Dir), mapping.RemoteStorageName)
+	for dir, storageLocation := range mappings.Mappings {
+		rs.mapDirectoryToRemoteStorage(util.FullPath(dir), storageLocation)
 	}
 	return nil
 }
@@ -75,16 +75,18 @@ func (rs *FilerRemoteStorage) mapDirectoryToRemoteStorage(dir util.FullPath, rem
 }
 
 func (rs *FilerRemoteStorage) FindRemoteStorageClient(p util.FullPath) (client remote_storage.RemoteStorageClient, found bool) {
-	var storageName string
+	var storageLocation string
 	rs.rules.MatchPrefix([]byte(p), func(key []byte, value interface{}) bool {
-		storageName = value.(string)
+		storageLocation = value.(string)
 		return true
 	})
 
-	if storageName == "" {
+	if storageLocation == "" {
 		return
 	}
 
+	storageName, _, _ := remote_storage.RemoteStorageLocation(storageLocation).NameBucketPath()
+
 	remoteConf, ok := rs.storageNameToConf[storageName]
 	if !ok {
 		return
@@ -97,3 +99,23 @@ func (rs *FilerRemoteStorage) FindRemoteStorageClient(p util.FullPath) (client r
 	}
 	return
 }
+
+func AddMapping(oldContent []byte, dir string, storageLocation remote_storage.RemoteStorageLocation) (newContent []byte, err error) {
+	mappings := &filer_pb.RemoteStorageMapping{
+		Mappings: make(map[string]string),
+	}
+	if len(oldContent) > 0 {
+		if err = proto.Unmarshal(oldContent, mappings); err != nil {
+			return oldContent, fmt.Errorf("unmarshal existing mappings: %v", err)
+		}
+	}
+
+	// set the new mapping
+	mappings.Mappings[dir] = string(storageLocation)
+
+	if newContent, err = proto.Marshal(mappings); err != nil {
+		return oldContent, fmt.Errorf("unmarshal existing mappings: %v", err)
+	}
+
+	return
+}
\ No newline at end of file
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 12f9a8505..efecc4e97 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -392,10 +392,6 @@ message RemoteConf {
     string s3_endpoint = 7;
 }
 
-message RemoteStorageMappingList {
-    repeated RemoteStorageMapping mappings = 1;
-}
 message RemoteStorageMapping {
-    string dir = 1;
-    string remote_storage_name = 2;
+    map<string,string> mappings = 1;
 }
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 65b882a6c..7739f65e8 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -3255,66 +3255,18 @@ func (x *RemoteConf) GetS3Endpoint() string {
 	return ""
 }
 
-type RemoteStorageMappingList struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Mappings []*RemoteStorageMapping `protobuf:"bytes,1,rep,name=mappings,proto3" json:"mappings,omitempty"`
-}
-
-func (x *RemoteStorageMappingList) Reset() {
-	*x = RemoteStorageMappingList{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[50]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *RemoteStorageMappingList) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*RemoteStorageMappingList) ProtoMessage() {}
-
-func (x *RemoteStorageMappingList) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[50]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use RemoteStorageMappingList.ProtoReflect.Descriptor instead.
-func (*RemoteStorageMappingList) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{50}
-}
-
-func (x *RemoteStorageMappingList) GetMappings() []*RemoteStorageMapping {
-	if x != nil {
-		return x.Mappings
-	}
-	return nil
-}
-
 type RemoteStorageMapping struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Dir               string `protobuf:"bytes,1,opt,name=dir,proto3" json:"dir,omitempty"`
-	RemoteStorageName string `protobuf:"bytes,2,opt,name=remote_storage_name,json=remoteStorageName,proto3" json:"remote_storage_name,omitempty"`
+	Mappings map[string]string `protobuf:"bytes,1,rep,name=mappings,proto3" json:"mappings,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *RemoteStorageMapping) Reset() {
 	*x = RemoteStorageMapping{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[51]
+		mi := &file_filer_proto_msgTypes[50]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3327,7 +3279,7 @@ func (x *RemoteStorageMapping) String() string {
 func (*RemoteStorageMapping) ProtoMessage() {}
 
 func (x *RemoteStorageMapping) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[51]
+	mi := &file_filer_proto_msgTypes[50]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3340,21 +3292,14 @@ func (x *RemoteStorageMapping) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RemoteStorageMapping.ProtoReflect.Descriptor instead.
 func (*RemoteStorageMapping) Descriptor() ([]byte, []int) {
-	return file_filer_proto_rawDescGZIP(), []int{51}
-}
-
-func (x *RemoteStorageMapping) GetDir() string {
-	if x != nil {
-		return x.Dir
-	}
-	return ""
+	return file_filer_proto_rawDescGZIP(), []int{50}
 }
 
-func (x *RemoteStorageMapping) GetRemoteStorageName() string {
+func (x *RemoteStorageMapping) GetMappings() map[string]string {
 	if x != nil {
-		return x.RemoteStorageName
+		return x.Mappings
 	}
-	return ""
+	return nil
 }
 
 // if found, send the exact address
@@ -3371,7 +3316,7 @@ type LocateBrokerResponse_Resource struct {
 func (x *LocateBrokerResponse_Resource) Reset() {
 	*x = LocateBrokerResponse_Resource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[54]
+		mi := &file_filer_proto_msgTypes[53]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3384,7 +3329,7 @@ func (x *LocateBrokerResponse_Resource) String() string {
 func (*LocateBrokerResponse_Resource) ProtoMessage() {}
 
 func (x *LocateBrokerResponse_Resource) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[54]
+	mi := &file_filer_proto_msgTypes[53]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3432,7 +3377,7 @@ type FilerConf_PathConf struct {
 func (x *FilerConf_PathConf) Reset() {
 	*x = FilerConf_PathConf{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_filer_proto_msgTypes[55]
+		mi := &file_filer_proto_msgTypes[54]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3445,7 +3390,7 @@ func (x *FilerConf_PathConf) String() string {
 func (*FilerConf_PathConf) ProtoMessage() {}
 
 func (x *FilerConf_PathConf) ProtoReflect() protoreflect.Message {
-	mi := &file_filer_proto_msgTypes[55]
+	mi := &file_filer_proto_msgTypes[54]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3943,126 +3888,125 @@ var file_filer_proto_rawDesc = []byte{
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+	0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x68, 0x72, 0x69, 0x73, 0x6c, 0x75, 0x73, 0x66,
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+	0x70, 0x62, 0x2f, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -4129,19 +4073,19 @@ var file_filer_proto_goTypes = []interface{}{
 	(*KvPutResponse)(nil),                 // 47: filer_pb.KvPutResponse
 	(*FilerConf)(nil),                     // 48: filer_pb.FilerConf
 	(*RemoteConf)(nil),                    // 49: filer_pb.RemoteConf
-	(*RemoteStorageMappingList)(nil),      // 50: filer_pb.RemoteStorageMappingList
-	(*RemoteStorageMapping)(nil),          // 51: filer_pb.RemoteStorageMapping
-	nil,                                   // 52: filer_pb.Entry.ExtendedEntry
-	nil,                                   // 53: filer_pb.LookupVolumeResponse.LocationsMapEntry
-	(*LocateBrokerResponse_Resource)(nil), // 54: filer_pb.LocateBrokerResponse.Resource
-	(*FilerConf_PathConf)(nil),            // 55: filer_pb.FilerConf.PathConf
+	(*RemoteStorageMapping)(nil),          // 50: filer_pb.RemoteStorageMapping
+	nil,                                   // 51: filer_pb.Entry.ExtendedEntry
+	nil,                                   // 52: filer_pb.LookupVolumeResponse.LocationsMapEntry
+	(*LocateBrokerResponse_Resource)(nil), // 53: filer_pb.LocateBrokerResponse.Resource
+	(*FilerConf_PathConf)(nil),            // 54: filer_pb.FilerConf.PathConf
+	nil,                                   // 55: filer_pb.RemoteStorageMapping.MappingsEntry
 }
 var file_filer_proto_depIdxs = []int32{
 	5,  // 0: filer_pb.LookupDirectoryEntryResponse.entry:type_name -> filer_pb.Entry
 	5,  // 1: filer_pb.ListEntriesResponse.entry:type_name -> filer_pb.Entry
 	8,  // 2: filer_pb.Entry.chunks:type_name -> filer_pb.FileChunk
 	11, // 3: filer_pb.Entry.attributes:type_name -> filer_pb.FuseAttributes
-	52, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
+	51, // 4: filer_pb.Entry.extended:type_name -> filer_pb.Entry.ExtendedEntry
 	4,  // 5: filer_pb.Entry.remote_entry:type_name -> filer_pb.RemoteEntry
 	5,  // 6: filer_pb.FullEntry.entry:type_name -> filer_pb.Entry
 	5,  // 7: filer_pb.EventNotification.old_entry:type_name -> filer_pb.Entry
@@ -4153,12 +4097,12 @@ var file_filer_proto_depIdxs = []int32{
 	5,  // 13: filer_pb.UpdateEntryRequest.entry:type_name -> filer_pb.Entry
 	8,  // 14: filer_pb.AppendToEntryRequest.chunks:type_name -> filer_pb.FileChunk
 	26, // 15: filer_pb.Locations.locations:type_name -> filer_pb.Location
-	53, // 16: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
+	52, // 16: filer_pb.LookupVolumeResponse.locations_map:type_name -> filer_pb.LookupVolumeResponse.LocationsMapEntry
 	28, // 17: filer_pb.CollectionListResponse.collections:type_name -> filer_pb.Collection
 	7,  // 18: filer_pb.SubscribeMetadataResponse.event_notification:type_name -> filer_pb.EventNotification
-	54, // 19: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
-	55, // 20: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
-	51, // 21: filer_pb.RemoteStorageMappingList.mappings:type_name -> filer_pb.RemoteStorageMapping
+	53, // 19: filer_pb.LocateBrokerResponse.resources:type_name -> filer_pb.LocateBrokerResponse.Resource
+	54, // 20: filer_pb.FilerConf.locations:type_name -> filer_pb.FilerConf.PathConf
+	55, // 21: filer_pb.RemoteStorageMapping.mappings:type_name -> filer_pb.RemoteStorageMapping.MappingsEntry
 	25, // 22: filer_pb.LookupVolumeResponse.LocationsMapEntry.value:type_name -> filer_pb.Locations
 	0,  // 23: filer_pb.SeaweedFiler.LookupDirectoryEntry:input_type -> filer_pb.LookupDirectoryEntryRequest
 	2,  // 24: filer_pb.SeaweedFiler.ListEntries:input_type -> filer_pb.ListEntriesRequest
@@ -4812,18 +4756,6 @@ func file_filer_proto_init() {
 			}
 		}
 		file_filer_proto_msgTypes[50].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RemoteStorageMappingList); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_filer_proto_msgTypes[51].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*RemoteStorageMapping); i {
 			case 0:
 				return &v.state
@@ -4835,7 +4767,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[53].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*LocateBrokerResponse_Resource); i {
 			case 0:
 				return &v.state
@@ -4847,7 +4779,7 @@ func file_filer_proto_init() {
 				return nil
 			}
 		}
-		file_filer_proto_msgTypes[55].Exporter = func(v interface{}, i int) interface{} {
+		file_filer_proto_msgTypes[54].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*FilerConf_PathConf); i {
 			case 0:
 				return &v.state
diff --git a/weed/remote_storage/remote_storage.go b/weed/remote_storage/remote_storage.go
index 79f71001b..8794e7268 100644
--- a/weed/remote_storage/remote_storage.go
+++ b/weed/remote_storage/remote_storage.go
@@ -3,13 +3,34 @@ package remote_storage
 import (
 	"fmt"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"strings"
 	"sync"
 )
 
+type RemoteStorageLocation string
+
+func (remote RemoteStorageLocation) NameBucketPath() (storageName, bucket, remotePath string) {
+	if strings.HasSuffix(string(remote), "/") {
+		remote = remote[:len(remote)-1]
+	}
+	parts := strings.SplitN(string(remote), "/", 3)
+	if len(parts)>=1 {
+		storageName = parts[0]
+	}
+	if len(parts)>=2 {
+		bucket = parts[1]
+	}
+	remotePath = string(remote[len(storageName)+1+len(bucket):])
+	if remotePath == "" {
+		remotePath = "/"
+	}
+	return
+}
+
 type VisitFunc func(dir string, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error
 
 type RemoteStorageClient interface {
-	Traverse(rootDir string, visitFn VisitFunc) error
+	Traverse(remote RemoteStorageLocation, visitFn VisitFunc) error
 }
 
 type RemoteStorageClientMaker interface {
diff --git a/weed/remote_storage/s3/s3_storage_client.go b/weed/remote_storage/s3/s3_storage_client.go
index 625d6e0e6..99fa21515 100644
--- a/weed/remote_storage/s3/s3_storage_client.go
+++ b/weed/remote_storage/s3/s3_storage_client.go
@@ -10,7 +10,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/remote_storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"strings"
 )
 
 func init() {
@@ -45,15 +44,9 @@ type s3RemoteStorageClient struct {
 	conn s3iface.S3API
 }
 
-func (s s3RemoteStorageClient) Traverse(rootDir string, visitFn remote_storage.VisitFunc) (err error) {
-	if !strings.HasPrefix(rootDir, "/") {
-		return fmt.Errorf("remote directory %s should start with /", rootDir)
-	}
-	bucket := strings.Split(rootDir[1:], "/")[0]
-	prefix := rootDir[1+len(bucket):]
-	if len(prefix) > 0 && strings.HasPrefix(prefix, "/") {
-		prefix = prefix[1:]
-	}
+func (s s3RemoteStorageClient) Traverse(remote remote_storage.RemoteStorageLocation, visitFn remote_storage.VisitFunc) (err error) {
+
+	_, bucket, pathKey := remote.NameBucketPath()
 
 	listInput := &s3.ListObjectsV2Input{
 		Bucket:              aws.String(bucket),
@@ -63,7 +56,7 @@ func (s s3RemoteStorageClient) Traverse(rootDir string, visitFn remote_storage.V
 		ExpectedBucketOwner: nil,
 		FetchOwner:          nil,
 		MaxKeys:             nil, // aws.Int64(1000),
-		Prefix:              aws.String(prefix),
+		Prefix:              aws.String(pathKey[1:]),
 		RequestPayer:        nil,
 		StartAfter:          nil,
 	}
@@ -71,8 +64,13 @@ func (s s3RemoteStorageClient) Traverse(rootDir string, visitFn remote_storage.V
 	for !isLastPage && err == nil {
 		listErr := s.conn.ListObjectsV2Pages(listInput, func(page *s3.ListObjectsV2Output, lastPage bool) bool {
 			for _, content := range page.Contents {
-				key := *content.Key
-				dir, name := util.FullPath("/" + key).DirAndName()
+				key := (*content.Key)
+				if len(pathKey) == 1 {
+					key = "/" + key
+				} else {
+					key = key[len(pathKey)-1:]
+				}
+				dir, name := util.FullPath(key).DirAndName()
 				if err := visitFn(dir, name, false, &filer_pb.RemoteEntry{
 					LastModifiedAt: (*content.LastModified).Unix(),
 					Size:           *content.Size,
@@ -87,7 +85,7 @@ func (s s3RemoteStorageClient) Traverse(rootDir string, visitFn remote_storage.V
 			return true
 		})
 		if listErr != nil {
-			err = fmt.Errorf("list %v: %v", rootDir, listErr)
+			err = fmt.Errorf("list %v: %v", remote, listErr)
 		}
 	}
 	return
diff --git a/weed/shell/command_remote_mount.go b/weed/shell/command_remote_mount.go
index 10541092a..217be8cef 100644
--- a/weed/shell/command_remote_mount.go
+++ b/weed/shell/command_remote_mount.go
@@ -10,7 +10,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/golang/protobuf/proto"
 	"io"
-	"strings"
 )
 
 func init() {
@@ -50,33 +49,32 @@ func (c *commandRemoteMount) Do(args []string, commandEnv *CommandEnv, writer io
 		return nil
 	}
 
+	remoteStorageLocation := remote_storage.RemoteStorageLocation(*remote)
+
 	// find configuration for remote storage
-	remoteConf, remotePath, err := c.findRemoteStorageConfiguration(commandEnv, writer, *remote)
+	// remotePath is /<bucket>/path/to/dir
+	remoteConf, err := c.findRemoteStorageConfiguration(commandEnv, writer, remoteStorageLocation)
 	if err != nil {
 		return fmt.Errorf("find configuration for %s: %v", *remote, err)
 	}
 
 	// pull metadata from remote
-	if err = c.pullMetadata(commandEnv, writer, *dir, *nonEmpty, remoteConf, remotePath); err != nil {
+	if err = c.pullMetadata(commandEnv, writer, *dir, *nonEmpty, remoteConf, remoteStorageLocation); err != nil {
 		return fmt.Errorf("pull metadata: %v", err)
 	}
 
 	// store a mount configuration in filer
-
+	if err = c.saveMountMapping(commandEnv, writer, *dir, remoteStorageLocation); err != nil {
+		return fmt.Errorf("save mount mapping: %v", err)
+	}
 
 	return nil
 }
 
-func (c *commandRemoteMount) findRemoteStorageConfiguration(commandEnv *CommandEnv, writer io.Writer, remote string) (conf *filer_pb.RemoteConf, remotePath string, err error) {
+func (c *commandRemoteMount) findRemoteStorageConfiguration(commandEnv *CommandEnv, writer io.Writer, remote remote_storage.RemoteStorageLocation) (conf *filer_pb.RemoteConf, err error) {
 
 	// find remote configuration
-	parts := strings.Split(remote, "/")
-	if len(parts) == 0 {
-		err = fmt.Errorf("wrong remote storage location %s", remote)
-		return
-	}
-	storageName := parts[0]
-	remotePath = remote[len(storageName):]
+	storageName, _, _ := remote.NameBucketPath()
 
 	// read storage configuration data
 	var confBytes []byte
@@ -99,7 +97,7 @@ func (c *commandRemoteMount) findRemoteStorageConfiguration(commandEnv *CommandE
 	return
 }
 
-func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writer, dir string, nonEmpty bool, remoteConf *filer_pb.RemoteConf, remotePath string) error {
+func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writer, dir string, nonEmpty bool, remoteConf *filer_pb.RemoteConf, remote remote_storage.RemoteStorageLocation) error {
 
 	// find existing directory, and ensure the directory is empty
 	var mountToDir *filer_pb.Entry
@@ -114,7 +112,7 @@ func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writ
 		}
 		mountToDir = resp.Entry
 
-		mountToDirIsEmpty := false
+		mountToDirIsEmpty := true
 		listErr := filer_pb.SeaweedList(client, dir, "", func(entry *filer_pb.Entry, isLast bool) error {
 			mountToDirIsEmpty = false
 			return nil
@@ -144,7 +142,7 @@ func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writ
 
 	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 		ctx := context.Background()
-		err = remoteStorage.Traverse(remotePath, func(remoteDir, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error {
+		err = remoteStorage.Traverse(remote, func(remoteDir, name string, isDirectory bool, remoteEntry *filer_pb.RemoteEntry) error {
 			localDir := dir + remoteDir
 			println(util.NewFullPath(localDir, name))
 
@@ -152,12 +150,14 @@ func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writ
 				Directory: localDir,
 				Name:      name,
 			})
+			var existingEntry *filer_pb.Entry
 			if lookupErr != nil {
 				if lookupErr != filer_pb.ErrNotFound {
 					return lookupErr
 				}
+			} else {
+				existingEntry = lookupResponse.Entry
 			}
-			existingEntry := lookupResponse.Entry
 
 			if existingEntry == nil {
 				_, createErr := client.CreateEntry(ctx, &filer_pb.CreateEntryRequest{
@@ -175,7 +175,7 @@ func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writ
 				})
 				return createErr
 			} else {
-				if existingEntry.RemoteEntry.ETag != remoteEntry.ETag {
+				if existingEntry.RemoteEntry == nil || existingEntry.RemoteEntry.ETag != remoteEntry.ETag {
 					existingEntry.RemoteEntry = remoteEntry
 					existingEntry.Attributes.FileSize = uint64(remoteEntry.Size)
 					existingEntry.Attributes.Mtime = remoteEntry.LastModifiedAt
@@ -197,3 +197,34 @@ func (c *commandRemoteMount) pullMetadata(commandEnv *CommandEnv, writer io.Writ
 
 	return nil
 }
+
+func (c *commandRemoteMount) saveMountMapping(commandEnv *CommandEnv, writer io.Writer, dir string, remoteStorageLocation remote_storage.RemoteStorageLocation) (err error) {
+
+	// read current mapping
+	var oldContent, newContent []byte
+	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		oldContent, err = filer.ReadInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE)
+		return err
+	})
+	if err != nil {
+		if err != filer_pb.ErrNotFound {
+			return fmt.Errorf("read existing mapping: %v", err)
+		}
+	}
+
+	// add new mapping
+	newContent, err = filer.AddMapping(oldContent, dir, remoteStorageLocation)
+	if err != nil {
+		return fmt.Errorf("add mapping %s~%s: %v", dir, remoteStorageLocation, err)
+	}
+
+	// save back
+	err = commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+		return filer.SaveInsideFiler(client, filer.DirectoryEtcRemote, filer.REMOTE_STORAGE_MOUNT_FILE, newContent)
+	})
+	if err != nil {
+		return fmt.Errorf("save mapping: %v", err)
+	}
+
+	return nil
+}