git: fix cloning with branch name

Signed-off-by: Arieh Schneier <15041913+AriehSchneier@users.noreply.github.com>

repository.go

@@ -1012,9 +1012,21 @@ func (r *Repository) fetchAndUpdateReferences(
 		return nil, err
 	}
 
-	resolvedRef, err := storer.ResolveReference(remoteRefs, ref)
+	var resolvedRef *plumbing.Reference
+	// return error from checking the raw ref passed in
+	var rawRefError error
+	for _, rule := range append([]string{"%s"}, plumbing.RefRevParseRules...) {
+		resolvedRef, err = storer.ResolveReference(remoteRefs, plumbing.ReferenceName(fmt.Sprintf(rule, ref)))
+
+		if err == nil {
+			break
+		} else if rawRefError == nil {
+			rawRefError = err
+		}
+	}
+
 	if err != nil {
-		return nil, err
+		return nil, rawRefError
 	}
 
 	refsUpdated, err := r.updateReferences(remote.c.Fetch, resolvedRef)

repository_test.go

@@ -1020,6 +1020,14 @@ func (s *RepositorySuite) TestCloneConfig(c *C) {
 }
 
 func (s *RepositorySuite) TestCloneSingleBranchAndNonHEAD(c *C) {
+	s.testCloneSingleBranchAndNonHEADReference(c, "refs/heads/branch")
+}
+
+func (s *RepositorySuite) TestCloneSingleBranchAndNonHEADAndNonFull(c *C) {
+	s.testCloneSingleBranchAndNonHEADReference(c, "branch")
+}
+
+func (s *RepositorySuite) testCloneSingleBranchAndNonHEADReference(c *C, ref string) {
 	r, _ := Init(memory.NewStorage(), nil)
 
 	head, err := r.Head()
@@ -1028,7 +1036,7 @@ func (s *RepositorySuite) TestCloneSingleBranchAndNonHEAD(c *C) {
 
 	err = r.clone(context.Background(), &CloneOptions{
 		URL:           s.GetBasicLocalRepositoryURL(),
-		ReferenceName: plumbing.ReferenceName("refs/heads/branch"),
+		ReferenceName: plumbing.ReferenceName(ref),
 		SingleBranch:  true,
 	})