Add Close() method to gogitRepository (#8901) (#8956)

Backport #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

10 files changed, 22 insertions, 24 deletions

diff --git a/models/graph_test.go b/models/graph_test.go
index 5c78e3877b..4e104592a3 100644
--- a/models/graph_test.go
+++ b/models/graph_test.go
@@ -17,6 +17,7 @@ func BenchmarkGetCommitGraph(b *testing.B) {
 	if err != nil {
 		b.Error("Could not open repository")
 	}
+	defer currentRepo.Close()
 
 	for i := 0; i < b.N; i++ {
 		graph, err := GetCommitGraph(currentRepo)
diff --git a/models/migrations/v39.go b/models/migrations/v39.go
index 1312cb3313..992e06bcaa 100644
--- a/models/migrations/v39.go
+++ b/models/migrations/v39.go
@@ -47,6 +47,7 @@ func releaseAddColumnIsTagAndSyncTags(x *xorm.Engine) error {
 			if err = models.SyncReleasesWithTags(repo, gitRepo); err != nil {
 				log.Warn("SyncReleasesWithTags: %v", err)
 			}
+			gitRepo.Close()
 		}
 		if len(repos) < pageSize {
 			break
diff --git a/models/migrations/v82.go b/models/migrations/v82.go
index eb73f18343..83da703c8a 100644
--- a/models/migrations/v82.go
+++ b/models/migrations/v82.go
@@ -91,6 +91,7 @@ func fixReleaseSha1OnReleaseTable(x *xorm.Engine) error {
 				if err != nil {
 					return err
 				}
+				defer gitRepo.Close()
 				gitRepoCache[release.RepoID] = gitRepo
 			}
 
diff --git a/models/pull.go b/models/pull.go
index 2016874574..f93257008b 100644
--- a/models/pull.go
+++ b/models/pull.go
@@ -382,6 +382,7 @@ func (pr *PullRequest) GetLastCommitStatus() (status *CommitStatus, err error) {
 	if err != nil {
 		return nil, err
 	}
+	defer headGitRepo.Close()
 
 	lastCommitID, err := headGitRepo.GetBranchCommitID(pr.HeadBranch)
 	if err != nil {
@@ -571,6 +572,7 @@ func (pr *PullRequest) getMergeCommit() (*git.Commit, error) {
 	if err != nil {
 		return nil, fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer gitRepo.Close()
 
 	commit, err := gitRepo.GetCommit(mergeCommit[:40])
 	if err != nil {
@@ -955,6 +957,7 @@ func (pr *PullRequest) UpdatePatch() (err error) {
 	if err != nil {
 		return fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer headGitRepo.Close()
 
 	// Add a temporary remote.
 	tmpRemote := com.ToStr(time.Now().UnixNano())
@@ -996,6 +999,7 @@ func (pr *PullRequest) PushToBaseRepo() (err error) {
 	if err != nil {
 		return fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer headGitRepo.Close()
 
 	tmpRemoteName := fmt.Sprintf("tmp-pull-%d", pr.ID)
 	if err = headGitRepo.AddRemote(tmpRemoteName, pr.BaseRepo.RepoPath(), false); err != nil {
@@ -1185,6 +1189,7 @@ func checkForInvalidation(requests PullRequestList, repoID int64, doer *User, br
 		if err != nil {
 			log.Error("PullRequestList.InvalidateCodeComments: %v", err)
 		}
+		gitRepo.Close()
 	}()
 	return nil
 }
diff --git a/models/repo.go b/models/repo.go
index d8a462c37b..8875c96376 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -998,6 +998,7 @@ func MigrateRepositoryGitData(doer, u *User, repo *Repository, opts api.MigrateR
 	if err != nil {
 		return repo, fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer gitRepo.Close()
 
 	repo.IsEmpty, err = gitRepo.IsEmpty()
 	if err != nil {
diff --git a/models/repo_activity.go b/models/repo_activity.go
index 04612ae1ef..c95af85495 100644
--- a/models/repo_activity.go
+++ b/models/repo_activity.go
@@ -64,6 +64,8 @@ func GetActivityStats(repo *Repository, timeFrom time.Time, releases, issues, pr
 		if err != nil {
 			return nil, fmt.Errorf("OpenRepository: %v", err)
 		}
+		defer gitRepo.Close()
+
 		code, err := gitRepo.GetCodeActivityStats(timeFrom, repo.DefaultBranch)
 		if err != nil {
 			return nil, fmt.Errorf("FillFromGit: %v", err)
@@ -79,6 +81,8 @@ func GetActivityStatsTopAuthors(repo *Repository, timeFrom time.Time, count int)
 	if err != nil {
 		return nil, fmt.Errorf("OpenRepository: %v", err)
 	}
+	defer gitRepo.Close()
+
 	code, err := gitRepo.GetCodeActivityStats(timeFrom, "")
 	if err != nil {
 		return nil, fmt.Errorf("FillFromGit: %v", err)
diff --git a/models/repo_branch.go b/models/repo_branch.go
index dee6ef3d7e..c513231836 100644
--- a/models/repo_branch.go
+++ b/models/repo_branch.go
@@ -23,6 +23,7 @@ func (repo *Repository) GetBranch(branch string) (*git.Branch, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer gitRepo.Close()
 
 	return gitRepo.GetBranch(branch)
 }
@@ -38,6 +39,7 @@ func (repo *Repository) CheckBranchName(name string) error {
 	if err != nil {
 		return err
 	}
+	defer gitRepo.Close()
 
 	branches, err := repo.GetBranches()
 	if err != nil {
@@ -94,6 +96,7 @@ func (repo *Repository) CreateNewBranch(doer *User, oldBranchName, branchName st
 		log.Error("Unable to open temporary repository: %s (%v)", basePath, err)
 		return fmt.Errorf("Failed to open new temporary repository in: %s %v", basePath, err)
 	}
+	defer gitRepo.Close()
 
 	if err = gitRepo.CreateBranch(branchName, oldBranchName); err != nil {
 		log.Error("Unable to create branch: %s from %s. (%v)", branchName, oldBranchName, err)
@@ -140,6 +143,7 @@ func (repo *Repository) CreateNewBranchFromCommit(doer *User, commit, branchName
 		log.Error("Unable to open temporary repository: %s (%v)", basePath, err)
 		return fmt.Errorf("Failed to open new temporary repository in: %s %v", basePath, err)
 	}
+	defer gitRepo.Close()
 
 	if err = gitRepo.CreateBranch(branchName, commit); err != nil {
 		log.Error("Unable to create branch: %s from %s. (%v)", branchName, commit, err)
diff --git a/models/repo_tag.go b/models/repo_tag.go
deleted file mode 100644
index 3864b7a12a..0000000000
--- a/models/repo_tag.go
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2019 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
-
-package models
-
-import (
-	"code.gitea.io/gitea/modules/git"
-)
-
-// GetTagsByPath returns repo tags by its path
-func GetTagsByPath(path string) ([]*git.Tag, error) {
-	gitRepo, err := git.OpenRepository(path)
-	if err != nil {
-		return nil, err
-	}
-
-	return gitRepo.GetTagInfos()
-}
-
-// GetTags return repo's tags
-func (repo *Repository) GetTags() ([]*git.Tag, error) {
-	return GetTagsByPath(repo.RepoPath())
-}
diff --git a/models/wiki.go b/models/wiki.go
index 0460e0f079..8a2f739dad 100644
--- a/models/wiki.go
+++ b/models/wiki.go
@@ -140,6 +140,7 @@ func (repo *Repository) updateWikiPage(doer *User, oldWikiName, newWikiName, con
 		log.Error("Unable to open temporary repository: %s (%v)", basePath, err)
 		return fmt.Errorf("Failed to open new temporary repository in: %s %v", basePath, err)
 	}
+	defer gitRepo.Close()
 
 	if hasMasterBranch {
 		if err := gitRepo.ReadTreeToIndex("HEAD"); err != nil {
@@ -276,6 +277,7 @@ func (repo *Repository) DeleteWikiPage(doer *User, wikiName string) (err error)
 		log.Error("Unable to open temporary repository: %s (%v)", basePath, err)
 		return fmt.Errorf("Failed to open new temporary repository in: %s %v", basePath, err)
 	}
+	defer gitRepo.Close()
 
 	if err := gitRepo.ReadTreeToIndex("HEAD"); err != nil {
 		log.Error("Unable to read HEAD tree to index in: %s %v", basePath, err)
diff --git a/models/wiki_test.go b/models/wiki_test.go
index 991a3d95b9..37c0a86635 100644
--- a/models/wiki_test.go
+++ b/models/wiki_test.go
@@ -161,6 +161,7 @@ func TestRepository_AddWikiPage(t *testing.T) {
 			// Now need to show that the page has been added:
 			gitRepo, err := git.OpenRepository(repo.WikiPath())
 			assert.NoError(t, err)
+			defer gitRepo.Close()
 			masterTree, err := gitRepo.GetTree("master")
 			assert.NoError(t, err)
 			wikiPath := WikiNameToFilename(wikiName)
@@ -214,6 +215,7 @@ func TestRepository_EditWikiPage(t *testing.T) {
 			_, err := masterTree.GetTreeEntryByPath("Home.md")
 			assert.Error(t, err)
 		}
+		gitRepo.Close()
 	}
 }
 
@@ -226,6 +228,7 @@ func TestRepository_DeleteWikiPage(t *testing.T) {
 	// Now need to show that the page has been added:
 	gitRepo, err := git.OpenRepository(repo.WikiPath())
 	assert.NoError(t, err)
+	defer gitRepo.Close()
 	masterTree, err := gitRepo.GetTree("master")
 	assert.NoError(t, err)
 	wikiPath := WikiNameToFilename("Home")