shed: fix lint

cmd/lotus-shed/datastore-vlog.go

@@ -117,7 +117,7 @@ var datastoreVlog2CarCmd = &cli.Command{
 					err = carb.consume(c, b)
 					switch err {
 					case nil:
-					case fullCar:
+					case errFullCar:
 						root, err := carb.finalize()
 						if err != nil {
 							return xerrors.Errorf("carb finalize: %w", err)
@@ -217,12 +217,10 @@ type Entry struct {
 	UserMeta  byte
 	ExpiresAt uint64 // time.Unix
 	meta      byte
-	version   uint64
 
 	// Fields maintained internally.
-	offset   uint32
-	skipVlog bool
-	hlen     int // Length of the header.
+	offset uint32
+	hlen   int // Length of the header.
 }
 
 // Entry reads an entry from the provided reader. It also validates the checksum for every entry
@@ -284,12 +282,6 @@ type header struct {
 	userMeta  byte
 }
 
-const (
-	// Maximum possible size of the header. The maximum size of header struct will be 18 but the
-	// maximum size of varint encoded header will be 21.
-	maxHeaderSize = 21
-)
-
 // Encode encodes the header into []byte. The provided []byte should be atleast 5 bytes. The
 // function will panic if out []byte isn't large enough to hold all the values.
 // The encoded header looks like

cmd/lotus-shed/export.go

@@ -215,7 +215,7 @@ var exportRawCmd = &cli.Command{
 				err = carb.consume(c, b)
 				switch err {
 				case nil:
-				case fullCar:
+				case errFullCar:
 					root, err := carb.finalize()
 					if err != nil {
 						return xerrors.Errorf("carb finalize: %w", err)
@@ -263,7 +263,7 @@ var exportRawCmd = &cli.Command{
 				if err != nil {
 					return fmt.Errorf("failed to open badger blockstore: %w", err)
 				}
-				defer db.Close()
+				defer db.Close() // nolint:errcheck
 
 				log.Infow("new stream")
 
@@ -332,7 +332,7 @@ var exportRawCmd = &cli.Command{
 	},
 }
 
-var fullCar = errors.New("full")
+var errFullCar = errors.New("full")
 
 const maxlinks = 16
 
@@ -418,7 +418,7 @@ func (rc *rawCarb) consume(c cid.Cid, b block.Block) error {
 		return err
 	}
 	if rc.cur+uint64(len(b.RawData())) > rc.max {
-		return fullCar
+		return errFullCar
 	}
 
 	rc.cur += uint64(len(b.RawData()))