Fixed library install from git when ref points to a branch

internal/arduino/libraries/librariesmanager/install.go

@@ -219,25 +219,15 @@ func (lmi *Installer) InstallGitLib(argURL string, overwrite bool) error {
 	if ref != "" {
 		depth = 0
 	}
-	repo, err := git.PlainClone(tmpInstallPath.String(), false, &git.CloneOptions{
-		URL:      gitURL,
-		Depth:    depth,
-		Progress: os.Stdout,
-	})
-	if err != nil {
+	if _, err := git.PlainClone(tmpInstallPath.String(), false, &git.CloneOptions{
+		URL:           gitURL,
+		Depth:         depth,
+		Progress:      os.Stdout,
+		ReferenceName: ref,
+	}); err != nil {
 		return err
 	}
 
-	if ref != "" {
-		if h, err := repo.ResolveRevision(ref); err != nil {
-			return err
-		} else if w, err := repo.Worktree(); err != nil {
-			return err
-		} else if err := w.Checkout(&git.CheckoutOptions{Hash: plumbing.NewHash(h.String())}); err != nil {
-			return err
-		}
-	}
-
 	// We don't want the installed library to be a git repository thus we delete this folder
 	tmpInstallPath.Join(".git").RemoveAll()
 
@@ -251,7 +241,7 @@ func (lmi *Installer) InstallGitLib(argURL string, overwrite bool) error {
 
 // parseGitArgURL tries to recover a library name from a git URL.
 // Returns an error in case the URL is not a valid git URL.
-func parseGitArgURL(argURL string) (string, string, plumbing.Revision, error) {
+func parseGitArgURL(argURL string) (string, string, plumbing.ReferenceName, error) {
 	// On Windows handle paths with backslashes in the form C:\Path\to\library
 	if path := paths.New(argURL); path != nil && path.Exist() {
 		return path.Base(), argURL, "", nil
@@ -289,7 +279,7 @@ func parseGitArgURL(argURL string) (string, string, plumbing.Revision, error) {
 		return "", "", "", errors.New(i18n.Tr("invalid git url"))
 	}
 	// fragment == "1.0.3"
-	rev := plumbing.Revision(parsedURL.Fragment)
+	rev := plumbing.ReferenceName(parsedURL.Fragment)
 	// gitURL == "https://github.com/arduino-libraries/SigFox.git"
 	parsedURL.Fragment = ""
 	gitURL := parsedURL.String()