Add Close() method to gogitRepository (#8901)

In investigating #7947 it has become clear that the storage component of go-git repositories needs closing.

This PR adds this Close function and adds the Close functions as necessary.

In TransferOwnership the ctx.Repo.GitRepo is closed if it is open to help prevent the risk of multiple open files.

Fixes #7947

7 files changed, 87 insertions, 72 deletions

diff --git a/services/comments/comments.go b/services/comments/comments.go
index 1ae5e2743f..ba40bf582d 100644
--- a/services/comments/comments.go
+++ b/services/comments/comments.go
@@ -49,6 +49,7 @@ func CreateCodeComment(doer *models.User, repo *models.Repository, issue *models
 	if err != nil {
 		return nil, fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer gitRepo.Close()
 
 	// FIXME validate treePath
 	// Get latest commit referencing the commented line
diff --git a/services/gitdiff/gitdiff.go b/services/gitdiff/gitdiff.go
index c2c5675d9f..9c2aef5c97 100644
--- a/services/gitdiff/gitdiff.go
+++ b/services/gitdiff/gitdiff.go
@@ -678,6 +678,7 @@ func GetDiffRangeWithWhitespaceBehavior(repoPath, beforeCommitID, afterCommitID
 	if err != nil {
 		return nil, err
 	}
+	defer gitRepo.Close()
 
 	commit, err := gitRepo.GetCommit(afterCommitID)
 	if err != nil {
@@ -750,6 +751,7 @@ func GetRawDiffForFile(repoPath, startCommit, endCommit string, diffType RawDiff
 	if err != nil {
 		return fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer repo.Close()
 
 	commit, err := repo.GetCommit(endCommit)
 	if err != nil {
diff --git a/services/mirror/mirror.go b/services/mirror/mirror.go
index 11430c2070..8c8131b5c2 100644
--- a/services/mirror/mirror.go
+++ b/services/mirror/mirror.go
@@ -197,8 +197,10 @@ func runSync(m *models.Mirror) ([]*mirrorSyncResult, bool) {
 		return nil, false
 	}
 	if err = models.SyncReleasesWithTags(m.Repo, gitRepo); err != nil {
+		gitRepo.Close()
 		log.Error("Failed to synchronize tags to releases for repository: %v", err)
 	}
+	gitRepo.Close()
 
 	if err := m.Repo.UpdateSize(); err != nil {
 		log.Error("Failed to update size for mirror repository: %v", err)
@@ -290,97 +292,103 @@ func Update() {
 func SyncMirrors() {
 	// Start listening on new sync requests.
 	for repoID := range mirrorQueue.Queue() {
-		log.Trace("SyncMirrors [repo_id: %v]", repoID)
-		mirrorQueue.Remove(repoID)
+		syncMirror(repoID)
+	}
+}
+
+func syncMirror(repoID string) {
+	log.Trace("SyncMirrors [repo_id: %v]", repoID)
+	mirrorQueue.Remove(repoID)
+
+	m, err := models.GetMirrorByRepoID(com.StrTo(repoID).MustInt64())
+	if err != nil {
+		log.Error("GetMirrorByRepoID [%s]: %v", repoID, err)
+		return
+
+	}
+
+	results, ok := runSync(m)
+	if !ok {
+		return
+	}
+
+	m.ScheduleNextUpdate()
+	if err = models.UpdateMirror(m); err != nil {
+		log.Error("UpdateMirror [%s]: %v", repoID, err)
+		return
+	}
 
-		m, err := models.GetMirrorByRepoID(com.StrTo(repoID).MustInt64())
+	var gitRepo *git.Repository
+	if len(results) == 0 {
+		log.Trace("SyncMirrors [repo_id: %d]: no commits fetched", m.RepoID)
+	} else {
+		gitRepo, err = git.OpenRepository(m.Repo.RepoPath())
 		if err != nil {
-			log.Error("GetMirrorByRepoID [%s]: %v", repoID, err)
-			continue
+			log.Error("OpenRepository [%d]: %v", m.RepoID, err)
+			return
 		}
+		defer gitRepo.Close()
+	}
 
-		results, ok := runSync(m)
-		if !ok {
+	for _, result := range results {
+		// Discard GitHub pull requests, i.e. refs/pull/*
+		if strings.HasPrefix(result.refName, "refs/pull/") {
 			continue
 		}
 
-		m.ScheduleNextUpdate()
-		if err = models.UpdateMirror(m); err != nil {
-			log.Error("UpdateMirror [%s]: %v", repoID, err)
+		// Create reference
+		if result.oldCommitID == gitShortEmptySha {
+			if err = SyncCreateAction(m.Repo, result.refName); err != nil {
+				log.Error("SyncCreateAction [repo_id: %d]: %v", m.RepoID, err)
+			}
 			continue
 		}
 
-		var gitRepo *git.Repository
-		if len(results) == 0 {
-			log.Trace("SyncMirrors [repo_id: %d]: no commits fetched", m.RepoID)
-		} else {
-			gitRepo, err = git.OpenRepository(m.Repo.RepoPath())
-			if err != nil {
-				log.Error("OpenRepository [%d]: %v", m.RepoID, err)
-				continue
+		// Delete reference
+		if result.newCommitID == gitShortEmptySha {
+			if err = SyncDeleteAction(m.Repo, result.refName); err != nil {
+				log.Error("SyncDeleteAction [repo_id: %d]: %v", m.RepoID, err)
 			}
+			continue
 		}
 
-		for _, result := range results {
-			// Discard GitHub pull requests, i.e. refs/pull/*
-			if strings.HasPrefix(result.refName, "refs/pull/") {
-				continue
-			}
-
-			// Create reference
-			if result.oldCommitID == gitShortEmptySha {
-				if err = SyncCreateAction(m.Repo, result.refName); err != nil {
-					log.Error("SyncCreateAction [repo_id: %d]: %v", m.RepoID, err)
-				}
-				continue
-			}
-
-			// Delete reference
-			if result.newCommitID == gitShortEmptySha {
-				if err = SyncDeleteAction(m.Repo, result.refName); err != nil {
-					log.Error("SyncDeleteAction [repo_id: %d]: %v", m.RepoID, err)
-				}
-				continue
-			}
-
-			// Push commits
-			oldCommitID, err := git.GetFullCommitID(gitRepo.Path, result.oldCommitID)
-			if err != nil {
-				log.Error("GetFullCommitID [%d]: %v", m.RepoID, err)
-				continue
-			}
-			newCommitID, err := git.GetFullCommitID(gitRepo.Path, result.newCommitID)
-			if err != nil {
-				log.Error("GetFullCommitID [%d]: %v", m.RepoID, err)
-				continue
-			}
-			commits, err := gitRepo.CommitsBetweenIDs(newCommitID, oldCommitID)
-			if err != nil {
-				log.Error("CommitsBetweenIDs [repo_id: %d, new_commit_id: %s, old_commit_id: %s]: %v", m.RepoID, newCommitID, oldCommitID, err)
-				continue
-			}
-			if err = SyncPushAction(m.Repo, SyncPushActionOptions{
-				RefName:     result.refName,
-				OldCommitID: oldCommitID,
-				NewCommitID: newCommitID,
-				Commits:     models.ListToPushCommits(commits),
-			}); err != nil {
-				log.Error("SyncPushAction [repo_id: %d]: %v", m.RepoID, err)
-				continue
-			}
+		// Push commits
+		oldCommitID, err := git.GetFullCommitID(gitRepo.Path, result.oldCommitID)
+		if err != nil {
+			log.Error("GetFullCommitID [%d]: %v", m.RepoID, err)
+			continue
 		}
-
-		// Get latest commit date and update to current repository updated time
-		commitDate, err := git.GetLatestCommitTime(m.Repo.RepoPath())
+		newCommitID, err := git.GetFullCommitID(gitRepo.Path, result.newCommitID)
 		if err != nil {
-			log.Error("GetLatestCommitDate [%d]: %v", m.RepoID, err)
+			log.Error("GetFullCommitID [%d]: %v", m.RepoID, err)
 			continue
 		}
-
-		if err = models.UpdateRepositoryUpdatedTime(m.RepoID, commitDate); err != nil {
-			log.Error("Update repository 'updated_unix' [%d]: %v", m.RepoID, err)
+		commits, err := gitRepo.CommitsBetweenIDs(newCommitID, oldCommitID)
+		if err != nil {
+			log.Error("CommitsBetweenIDs [repo_id: %d, new_commit_id: %s, old_commit_id: %s]: %v", m.RepoID, newCommitID, oldCommitID, err)
 			continue
 		}
+		if err = SyncPushAction(m.Repo, SyncPushActionOptions{
+			RefName:     result.refName,
+			OldCommitID: oldCommitID,
+			NewCommitID: newCommitID,
+			Commits:     models.ListToPushCommits(commits),
+		}); err != nil {
+			log.Error("SyncPushAction [repo_id: %d]: %v", m.RepoID, err)
+			continue
+		}
+	}
+
+	// Get latest commit date and update to current repository updated time
+	commitDate, err := git.GetLatestCommitTime(m.Repo.RepoPath())
+	if err != nil {
+		log.Error("GetLatestCommitDate [%d]: %v", m.RepoID, err)
+		return
+	}
+
+	if err = models.UpdateRepositoryUpdatedTime(m.RepoID, commitDate); err != nil {
+		log.Error("Update repository 'updated_unix' [%d]: %v", m.RepoID, err)
+		return
 	}
 }
 
diff --git a/services/mirror/mirror_test.go b/services/mirror/mirror_test.go
index 9ad11b7265..37e8a7be57 100644
--- a/services/mirror/mirror_test.go
+++ b/services/mirror/mirror_test.go
@@ -51,6 +51,7 @@ func TestRelease_MirrorDelete(t *testing.T) {
 
 	gitRepo, err := git.OpenRepository(repoPath)
 	assert.NoError(t, err)
+	defer gitRepo.Close()
 
 	findOptions := models.FindReleasesOptions{IncludeDrafts: true, IncludeTags: true}
 	initCount, err := models.GetReleaseCountByRepoID(mirror.ID, findOptions)
diff --git a/services/pull/commit_status.go b/services/pull/commit_status.go
index 2872db7bd2..ca00cdaad9 100644
--- a/services/pull/commit_status.go
+++ b/services/pull/commit_status.go
@@ -55,6 +55,7 @@ func IsPullCommitStatusPass(pr *models.PullRequest) (bool, error) {
 	if err != nil {
 		return false, errors.Wrap(err, "OpenRepository")
 	}
+	defer headGitRepo.Close()
 
 	if !headGitRepo.IsBranchExist(pr.HeadBranch) {
 		return false, errors.New("Head branch does not exist, can not merge")
diff --git a/services/pull/pull.go b/services/pull/pull.go
index 4e981b2b26..7a9c2ef9ad 100644
--- a/services/pull/pull.go
+++ b/services/pull/pull.go
@@ -48,6 +48,7 @@ func checkForInvalidation(requests models.PullRequestList, repoID int64, doer *m
 		if err != nil {
 			log.Error("PullRequestList.InvalidateCodeComments: %v", err)
 		}
+		gitRepo.Close()
 	}()
 	return nil
 }
diff --git a/services/release/release_test.go b/services/release/release_test.go
index d30dfee286..effab21251 100644
--- a/services/release/release_test.go
+++ b/services/release/release_test.go
@@ -27,6 +27,7 @@ func TestRelease_Create(t *testing.T) {
 
 	gitRepo, err := git.OpenRepository(repoPath)
 	assert.NoError(t, err)
+	defer gitRepo.Close()
 
 	assert.NoError(t, CreateRelease(gitRepo, &models.Release{
 		RepoID:       repo.ID,