package shell import ( "context" "flag" "fmt" "github.com/chrislusf/seaweedfs/weed/filer" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" "io" ) func init() { Commands = append(Commands, &commandRemoteUnmount{}) } type commandRemoteUnmount struct { } func (c *commandRemoteUnmount) Name() string { return "remote.unmount" } func (c *commandRemoteUnmount) Help() string { return `unmount remote storage # assume a remote storage is configured to name "s3_1" remote.configure -name=s3_1 -type=s3 -access_key=xxx -secret_key=yyy # mount and pull one bucket remote.mount -dir=/xxx -remote=s3_1/bucket # unmount the mounted directory and remove its cache # Make sure you have stopped "weed filer.remote.sync" first! # Otherwise, the deletion will also be propagated to the remote storage!!! remote.unmount -dir=/xxx -iHaveStoppedRemoteSync ` } func (c *commandRemoteUnmount) Do(args []string, commandEnv *CommandEnv, writer io.Writer) (err error) { remoteMountCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError) dir := remoteMountCommand.String("dir", "", "a directory in filer") hasStoppedRemoteSync := remoteMountCommand.Bool("iHaveStoppedRemoteSync", false, "confirm to stop weed filer.remote.sync first") if err = remoteMountCommand.Parse(args); err != nil { return nil } mappings, listErr := filer.ReadMountMappings(commandEnv.option.GrpcDialOption, commandEnv.option.FilerAddress) if listErr != nil { return listErr } if *dir == "" { return jsonPrintln(writer, mappings) } _, found := mappings.Mappings[*dir] if !found { return fmt.Errorf("directory %s is not mounted", *dir) } if !*hasStoppedRemoteSync { return fmt.Errorf("make sure \"weed filer.remote.sync\" is stopped to avoid data loss") } // purge mounted data if err = c.purgeMountedData(commandEnv, *dir); err != nil { return fmt.Errorf("purge mounted data: %v", err) } // store a mount configuration in filer if err = c.deleteMountMapping(commandEnv, *dir); err != nil { return fmt.Errorf("delete mount mapping: %v", err) } return nil } func (c *commandRemoteUnmount) purgeMountedData(commandEnv *CommandEnv, dir string) error { // find existing directory, and ensure the directory is empty err := commandEnv.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error { parent, name := util.FullPath(dir).DirAndName() lookupResp, lookupErr := client.LookupDirectoryEntry(context.Background(), &filer_pb.LookupDirectoryEntryRequest{ Directory: parent, Name: name, }) if lookupErr != nil { return fmt.Errorf("lookup %s: %v", dir, lookupErr) } oldEntry := lookupResp.Entry deleteError := filer_pb.DoRemove(client, parent, name, true, true, true, false, nil) if deleteError != nil { return fmt.Errorf("delete %s: %v", dir, deleteError) } mkdirErr := filer_pb.DoMkdir(client, parent, name, func(entry *filer_pb.Entry) { entry.Attributes = oldEntry.Attributes entry.Extended = oldEntry.Extended }) if mkdirErr != nil { return fmt.Errorf("mkdir %s: %v", dir, mkdirErr) } return nil }) if err != nil { return err } return nil } func (c *commandRemoteUnmount) deleteMountMapping(commandEnv *CommandEnv, dir string) (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.RemoveRemoteStorageMapping(oldContent, dir) if err != nil { return fmt.Errorf("delete mount %s: %v", dir, 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 }