From 1752eeb53803736f72d85d35f504997744288716 Mon Sep 17 00:00:00 2001 From: Chris Lu Date: Tue, 27 Jul 2021 03:26:35 -0700 Subject: [PATCH] remote.mount saves the mapping --- other/java/client/src/main/proto/filer.proto | 6 +- weed/filer/filer_remote_storage.go | 34 +- weed/pb/filer.proto | 6 +- weed/pb/filer_pb/filer.pb.go | 352 ++++++++----------- weed/remote_storage/remote_storage.go | 23 +- weed/remote_storage/s3/s3_storage_client.go | 26 +- weed/shell/command_remote_mount.go | 65 +++- 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 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 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{ 0x09, 0x73, 0x33, 0x5f, 0x72, 0x65, 0x67, 0x69, 0x6f, 0x6e, 0x18, 0x06, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x73, 0x33, 0x52, 0x65, 0x67, 0x69, 0x6f, 0x6e, 0x12, 0x1f, 0x0a, 0x0b, 0x73, 0x33, 0x5f, 0x65, 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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 //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 +}