Error strings should not be capitalized

Reported by staticcheck 2022.1.2 (v0.3.2)

See: staticcheck.io

cmd/cmd.go

@@ -117,7 +117,7 @@ func newFsFileAddFilter(remote string) (fs.Fs, string) {
 	f, fileName := NewFsFile(remote)
 	if fileName != "" {
 		if !fi.InActive() {
-			err := fmt.Errorf("Can't limit to single files when using filters: %v", remote)
+			err := fmt.Errorf("can't limit to single files when using filters: %v", remote)
 			err = fs.CountError(err)
 			log.Fatalf(err.Error())
 		}

cmd/config/config.go

@@ -402,7 +402,7 @@ To reconnect use "rclone config reconnect".
 		}
 		err := doDisconnect(context.Background())
 		if err != nil {
-			return fmt.Errorf("Disconnect call failed: %w", err)
+			return fmt.Errorf("disconnect call failed: %w", err)
 		}
 		return nil
 	},

cmd/cryptdecode/cryptdecode.go

@@ -48,7 +48,7 @@ See the documentation on the [crypt](/crypt/) overlay for more info.
 				return err
 			}
 			if fsInfo.Name != "crypt" {
-				return errors.New("The remote needs to be of type \"crypt\"")
+				return errors.New("the remote needs to be of type \"crypt\"")
 			}
 			cipher, err := crypt.NewCipher(config)
 			if err != nil {

cmd/lsf/lsf.go

@@ -199,7 +199,7 @@ func Lsf(ctx context.Context, fsrc fs.Fs, out io.Writer) error {
 		case 'T':
 			list.AddTier()
 		default:
-			return fmt.Errorf("Unknown format character %q", char)
+			return fmt.Errorf("unknown format character %q", char)
 		}
 	}
 

cmd/mount/dir.go

@@ -199,7 +199,7 @@ func (d *Dir) Rename(ctx context.Context, req *fuse.RenameRequest, newDir fusefs
 	defer log.Trace(d, "oldName=%q, newName=%q, newDir=%+v", req.OldName, req.NewName, newDir)("err=%v", &err)
 	destDir, ok := newDir.(*Dir)
 	if !ok {
-		return fmt.Errorf("Unknown Dir type %T", newDir)
+		return fmt.Errorf("unknown Dir type %T", newDir)
 	}
 
 	err = d.Dir.Rename(req.OldName, req.NewName, destDir.Dir)

cmd/mountlib/check_linux.go

@@ -22,7 +22,7 @@ const (
 // On Linux we use the OS-specific /proc/mount API so the check won't access the path.
 // Directories marked as "mounted" by autofs are considered not mounted.
 func CheckMountEmpty(mountpoint string) error {
-	const msg = "Directory already mounted, use --allow-non-empty to mount anyway: %s"
+	const msg = "directory already mounted, use --allow-non-empty to mount anyway: %s"
 
 	mountpointAbs, err := filepath.Abs(mountpoint)
 	if err != nil {

cmd/mountlib/check_other.go

@@ -17,7 +17,7 @@ import (
 func CheckMountEmpty(mountpoint string) error {
 	fp, err := os.Open(mountpoint)
 	if err != nil {
-		return fmt.Errorf("Can not open: %s: %w", mountpoint, err)
+		return fmt.Errorf("cannot open: %s: %w", mountpoint, err)
 	}
 	defer fs.CheckClose(fp, &err)
 
@@ -26,7 +26,7 @@ func CheckMountEmpty(mountpoint string) error {
 		return nil
 	}
 
-	const msg = "Directory is not empty, use --allow-non-empty to mount anyway: %s"
+	const msg = "directory is not empty, use --allow-non-empty to mount anyway: %s"
 	if err == nil {
 		return fmt.Errorf(msg, mountpoint)
 	}

cmd/rc/rc.go

@@ -211,7 +211,7 @@ func doCall(ctx context.Context, path string, in rc.Params) (out rc.Params, err
 			bodyString = err.Error()
 		}
 		bodyString = strings.TrimSpace(bodyString)
-		return nil, fmt.Errorf("Failed to read rc response: %s: %s", resp.Status, bodyString)
+		return nil, fmt.Errorf("failed to read rc response: %s: %s", resp.Status, bodyString)
 	}
 
 	// Parse output

cmd/serve/ftp/ftp.go

@@ -135,11 +135,11 @@ var passivePortsRe = regexp.MustCompile(`^\s*\d+\s*-\s*\d+\s*$`)
 func newServer(ctx context.Context, f fs.Fs, opt *Options) (*server, error) {
 	host, port, err := net.SplitHostPort(opt.ListenAddr)
 	if err != nil {
-		return nil, errors.New("Failed to parse host:port")
+		return nil, errors.New("failed to parse host:port")
 	}
 	portNum, err := strconv.Atoi(port)
 	if err != nil {
-		return nil, errors.New("Failed to parse host:port")
+		return nil, errors.New("failed to parse host:port")
 	}
 
 	s := &server{
@@ -284,7 +284,7 @@ func (d *Driver) ChangeDir(path string) (err error) {
 		return err
 	}
 	if !n.IsDir() {
-		return errors.New("Not a directory")
+		return errors.New("not a directory")
 	}
 	return nil
 }
@@ -296,12 +296,12 @@ func (d *Driver) ListDir(path string, callback func(ftp.FileInfo) error) (err er
 	defer log.Trace(path, "")("err = %v", &err)
 	node, err := d.vfs.Stat(path)
 	if err == vfs.ENOENT {
-		return errors.New("Directory not found")
+		return errors.New("directory not found")
 	} else if err != nil {
 		return err
 	}
 	if !node.IsDir() {
-		return errors.New("Not a directory")
+		return errors.New("not a directory")
 	}
 
 	dir := node.(*vfs.Dir)
@@ -335,7 +335,7 @@ func (d *Driver) DeleteDir(path string) (err error) {
 		return err
 	}
 	if !node.IsDir() {
-		return errors.New("Not a directory")
+		return errors.New("not a directory")
 	}
 	err = node.Remove()
 	if err != nil {
@@ -354,7 +354,7 @@ func (d *Driver) DeleteFile(path string) (err error) {
 		return err
 	}
 	if !node.IsFile() {
-		return errors.New("Not a file")
+		return errors.New("not a file")
 	}
 	err = node.Remove()
 	if err != nil {
@@ -392,12 +392,12 @@ func (d *Driver) GetFile(path string, offset int64) (size int64, fr io.ReadClose
 	node, err := d.vfs.Stat(path)
 	if err == vfs.ENOENT {
 		fs.Infof(path, "File not found")
-		return 0, nil, errors.New("File not found")
+		return 0, nil, errors.New("file not found")
 	} else if err != nil {
 		return 0, nil, err
 	}
 	if !node.IsFile() {
-		return 0, nil, errors.New("Not a file")
+		return 0, nil, errors.New("not a file")
 	}
 
 	handle, err := node.Open(os.O_RDONLY)
@@ -426,7 +426,7 @@ func (d *Driver) PutFile(path string, data io.Reader, appendData bool) (n int64,
 	if err == nil {
 		isExist = true
 		if node.IsDir() {
-			return 0, errors.New("A dir has the same name")
+			return 0, errors.New("a dir has the same name")
 		}
 	} else {
 		if os.IsNotExist(err) {

cmd/serve/restic/restic.go

@@ -139,7 +139,7 @@ with a path of ` + "`/<username>/`" + `.
 			s := NewServer(f, &httpflags.Opt)
 			if stdio {
 				if terminal.IsTerminal(int(os.Stdout.Fd())) {
-					return errors.New("Refusing to run HTTP2 server directly on a terminal, please let restic start rclone")
+					return errors.New("refusing to run HTTP2 server directly on a terminal, please let restic start rclone")
 				}
 
 				conn := &StdioConn{

cmd/serve/sftp/connection.go

@@ -74,7 +74,7 @@ func (c *conn) execCommand(ctx context.Context, out io.Writer, command string) (
 		}
 		usage, err := about(ctx)
 		if err != nil {
-			return fmt.Errorf("About failed: %w", err)
+			return fmt.Errorf("about failed: %w", err)
 		}
 		total, used, free := int64(-1), int64(-1), int64(-1)
 		if usage.Total != nil {

cmd/settier/settier.go

@@ -47,7 +47,7 @@ Or just provide remote directory and all files in directory will be tiered
 		cmd.Run(false, false, command, func() error {
 			isSupported := fsrc.Features().SetTier
 			if !isSupported {
-				return fmt.Errorf("Remote %s does not support settier", fsrc.Name())
+				return fmt.Errorf("remote %s does not support settier", fsrc.Name())
 			}
 
 			return operations.SetTier(context.Background(), fsrc, tier)

cmd/tree/tree.go

@@ -102,7 +102,7 @@ For a more interactive navigation of the remote see the
 			var err error
 			outFile, err = os.Create(outFileName)
 			if err != nil {
-				return fmt.Errorf("failed to create output file: %v", err)
+				return fmt.Errorf("failed to create output file: %w", err)
 			}
 		}
 		opts.VerSort = opts.VerSort || sort == "version"
@@ -209,7 +209,7 @@ func (dirs Fs) Stat(filePath string) (fi os.FileInfo, err error) {
 	}
 	_, entry := dirtree.DirTree(dirs).Find(filePath)
 	if entry == nil {
-		return nil, fmt.Errorf("Couldn't find %q in directory cache", filePath)
+		return nil, fmt.Errorf("couldn't find %q in directory cache", filePath)
 	}
 	return &FileInfo{entry}, nil
 }
@@ -221,7 +221,7 @@ func (dirs Fs) ReadDir(dir string) (names []string, err error) {
 	dir = strings.TrimLeft(dir, "/")
 	entries, ok := dirs[dir]
 	if !ok {
-		return nil, fmt.Errorf("Couldn't find directory %q", dir)
+		return nil, fmt.Errorf("couldn't find directory %q", dir)
 	}
 	for _, entry := range entries {
 		names = append(names, path.Base(entry.Remote()))