Fix NPE on try to get tag reference via API

modules/git/repo_commit_nogogit.go

@@ -99,11 +99,10 @@ func (repo *Repository) getCommitFromBatchReader(rd *bufio.Reader, id SHA1) (*Co
 		if err != nil {
 			return nil, err
 		}
-		tag, err := parseTagData(data)
+		tag, err := parseTagData(repo, data)
 		if err != nil {
 			return nil, err
 		}
-		tag.repo = repo
 
 		commit, err := tag.Commit()
 		if err != nil {

modules/git/repo_tag.go

@@ -85,14 +85,13 @@ func (repo *Repository) getTag(tagID SHA1, name string) (*Tag, error) {
 		return nil, err
 	}
 
-	tag, err := parseTagData(data)
+	tag, err := parseTagData(repo, data)
 	if err != nil {
 		return nil, err
 	}
 
 	tag.Name = name
 	tag.ID = tagID
-	tag.repo = repo
 	tag.Type = tp
 
 	repo.tagCache.Set(tagID.String(), tag)

modules/git/repo_tree_nogogit.go

@@ -30,7 +30,7 @@ func (repo *Repository) getTree(id SHA1) (*Tree, error) {
 		if err != nil {
 			return nil, err
 		}
-		tag, err := parseTagData(data)
+		tag, err := parseTagData(repo, data)
 		if err != nil {
 			return nil, err
 		}

modules/git/tag.go

@@ -33,8 +33,9 @@ func (tag *Tag) Commit() (*Commit, error) {
 // Parse commit information from the (uncompressed) raw
 // data from the commit object.
 // \n\n separate headers from message
-func parseTagData(data []byte) (*Tag, error) {
+func parseTagData(repo *Repository, data []byte) (*Tag, error) {
 	tag := new(Tag)
+	tag.repo = repo
 	tag.Tagger = &Signature{}
 	// we now have the contents of the commit object. Let's investigate...
 	nextline := 0

modules/git/tag_test.go

@@ -52,7 +52,7 @@ ono`), tag: Tag{
 	}
 
 	for _, test := range testData {
-		tag, err := parseTagData(test.data)
+		tag, err := parseTagData(nil, test.data)
 		assert.NoError(t, err)
 		assert.EqualValues(t, test.tag.ID, tag.ID)
 		assert.EqualValues(t, test.tag.Object, tag.Object)