Make redeclare cmd work

- Fix an issue where `lotus-miner storage redeclare --all` required an argument
- Actually implement the logic to redeclare a single sectors in a single storage path

cmd/lotus-miner/storage.go

@@ -235,14 +235,19 @@ var storageRedeclareCmd = &cli.Command{
 		defer closer()
 		ctx := lcli.ReqContext(cctx)
 
-		if cctx.NArg() != 1 {
+		// check if no argument and no --id or --all flag is provided
-			return lcli.IncorrectNumArgs(cctx)
+		if cctx.NArg() == 0 && !cctx.IsSet("id") && !cctx.Bool("all") {
+			return xerrors.Errorf("You must specify a storage path, or --id, or --all")
 		}
 
 		if cctx.IsSet("id") && cctx.Bool("all") {
 			return xerrors.Errorf("--id and --all can't be passed at the same time")
 		}
 
+		if cctx.Bool("all") && cctx.NArg() > 0 {
+			return xerrors.Errorf("No additional arguments are expected when --all is set")
+		}
+
 		if cctx.IsSet("id") {
 			id := storiface.ID(cctx.String("id"))
 			return minerApi.StorageRedeclareLocal(ctx, &id, cctx.Bool("drop-missing"))
@@ -252,7 +257,24 @@ var storageRedeclareCmd = &cli.Command{
 			return minerApi.StorageRedeclareLocal(ctx, nil, cctx.Bool("drop-missing"))
 		}
 
-		return xerrors.Errorf("either --all or --id must be specified")
+		// As no --id or --all flag is set, we can assume the argument is a path.
+		path := cctx.Args().First()
+		metaFilePath := filepath.Join(path, "sectorstore.json")
+
+		var meta storiface.LocalStorageMeta
+		metaFile, err := os.Open(metaFilePath)
+		if err != nil {
+			return xerrors.Errorf("Failed to open meta file: %w", err)
+		}
+		defer metaFile.Close()
+
+		err = json.NewDecoder(metaFile).Decode(&meta)
+		if err != nil {
+			return xerrors.Errorf("Failed to decode meta file: %w", err)
+		}
+
+		id := meta.ID
+		return minerApi.StorageRedeclareLocal(ctx, &id, cctx.Bool("drop-missing"))
 	},
 }