Also sync DB branches on push if necessary (#28361)

Fix #28056 

This PR will check whether the repo has zero branch when pushing a
branch. If that, it means this repository hasn't been synced.

The reason caused that is after user upgrade from v1.20 -> v1.21, he
just push branches without visit the repository user interface. Because
all repositories routers will check whether a branches sync is necessary
but push has not such check.

For every repository, it has two states, synced or not synced. If there
is zero branch for a repository, then it will be assumed as non-sync
state. Otherwise, it's synced state. So if we think it's synced, we just
need to update branch/insert new branch. Otherwise do a full sync. So
that, for every push, there will be almost no extra load added. It's
high performance than yours.

For the implementation, we in fact will try to update the branch first,
if updated success with affect records > 0, then all are done. Because
that means the branch has been in the database. If no record is
affected, that means the branch does not exist in database. So there are
two possibilities. One is this is a new branch, then we just need to
insert the record. Another is the branches haven't been synced, then we
need to sync all the branches into database.

9 files changed, 99 insertions, 73 deletions

diff --git a/models/git/branch.go b/models/git/branch.go
index 6d50fb9fb6..ffd1d7ed16 100644
--- a/models/git/branch.go
+++ b/models/git/branch.go
@@ -205,10 +205,9 @@ func DeleteBranches(ctx context.Context, repoID, doerID int64, branchIDs []int64
 	})
 }
 
-// UpdateBranch updates the branch information in the database. If the branch exist, it will update latest commit of this branch information
-// If it doest not exist, insert a new record into database
-func UpdateBranch(ctx context.Context, repoID, pusherID int64, branchName string, commit *git.Commit) error {
-	cnt, err := db.GetEngine(ctx).Where("repo_id=? AND name=?", repoID, branchName).
+// UpdateBranch updates the branch information in the database.
+func UpdateBranch(ctx context.Context, repoID, pusherID int64, branchName string, commit *git.Commit) (int64, error) {
+	return db.GetEngine(ctx).Where("repo_id=? AND name=?", repoID, branchName).
 		Cols("commit_id, commit_message, pusher_id, commit_time, is_deleted, updated_unix").
 		Update(&Branch{
 			CommitID:      commit.ID.String(),
@@ -217,21 +216,6 @@ func UpdateBranch(ctx context.Context, repoID, pusherID int64, branchName string
 			CommitTime:    timeutil.TimeStamp(commit.Committer.When.Unix()),
 			IsDeleted:     false,
 		})
-	if err != nil {
-		return err
-	}
-	if cnt > 0 {
-		return nil
-	}
-
-	return db.Insert(ctx, &Branch{
-		RepoID:        repoID,
-		Name:          branchName,
-		CommitID:      commit.ID.String(),
-		CommitMessage: commit.Summary(),
-		PusherID:      pusherID,
-		CommitTime:    timeutil.TimeStamp(commit.Committer.When.Unix()),
-	})
 }
 
 // AddDeletedBranch adds a deleted branch to the database
@@ -308,6 +292,17 @@ func RenameBranch(ctx context.Context, repo *repo_model.Repository, from, to str
 
 	sess := db.GetEngine(ctx)
 
+	var branch Branch
+	exist, err := db.GetEngine(ctx).Where("repo_id=? AND name=?", repo.ID, from).Get(&branch)
+	if err != nil {
+		return err
+	} else if !exist || branch.IsDeleted {
+		return ErrBranchNotExist{
+			RepoID:     repo.ID,
+			BranchName: from,
+		}
+	}
+
 	// 1. update branch in database
 	if n, err := sess.Where("repo_id=? AND name=?", repo.ID, from).Update(&Branch{
 		Name: to,
diff --git a/models/git/branch_list.go b/models/git/branch_list.go
index b5c1301a1d..2efe495264 100644
--- a/models/git/branch_list.go
+++ b/models/git/branch_list.go
@@ -73,7 +73,7 @@ type FindBranchOptions struct {
 	Keyword            string
 }
 
-func (opts *FindBranchOptions) Cond() builder.Cond {
+func (opts FindBranchOptions) ToConds() builder.Cond {
 	cond := builder.NewCond()
 	if opts.RepoID > 0 {
 		cond = cond.And(builder.Eq{"repo_id": opts.RepoID})
@@ -92,7 +92,7 @@ func (opts *FindBranchOptions) Cond() builder.Cond {
 }
 
 func CountBranches(ctx context.Context, opts FindBranchOptions) (int64, error) {
-	return db.GetEngine(ctx).Where(opts.Cond()).Count(&Branch{})
+	return db.GetEngine(ctx).Where(opts.ToConds()).Count(&Branch{})
 }
 
 func orderByBranches(sess *xorm.Session, opts FindBranchOptions) *xorm.Session {
@@ -108,7 +108,7 @@ func orderByBranches(sess *xorm.Session, opts FindBranchOptions) *xorm.Session {
 }
 
 func FindBranches(ctx context.Context, opts FindBranchOptions) (BranchList, error) {
-	sess := db.GetEngine(ctx).Where(opts.Cond())
+	sess := db.GetEngine(ctx).Where(opts.ToConds())
 	if opts.PageSize > 0 && !opts.IsListAll() {
 		sess = db.SetSessionPagination(sess, &opts.ListOptions)
 	}
@@ -119,7 +119,7 @@ func FindBranches(ctx context.Context, opts FindBranchOptions) (BranchList, erro
 }
 
 func FindBranchNames(ctx context.Context, opts FindBranchOptions) ([]string, error) {
-	sess := db.GetEngine(ctx).Select("name").Where(opts.Cond())
+	sess := db.GetEngine(ctx).Select("name").Where(opts.ToConds())
 	if opts.PageSize > 0 && !opts.IsListAll() {
 		sess = db.SetSessionPagination(sess, &opts.ListOptions)
 	}
diff --git a/models/git/branch_test.go b/models/git/branch_test.go
index ba69026927..07b243e5e6 100644
--- a/models/git/branch_test.go
+++ b/models/git/branch_test.go
@@ -37,7 +37,7 @@ func TestAddDeletedBranch(t *testing.T) {
 		},
 	}
 
-	err := git_model.UpdateBranch(db.DefaultContext, repo.ID, secondBranch.PusherID, secondBranch.Name, commit)
+	_, err := git_model.UpdateBranch(db.DefaultContext, repo.ID, secondBranch.PusherID, secondBranch.Name, commit)
 	assert.NoError(t, err)
 }
 
diff --git a/routers/api/v1/repo/branch.go b/routers/api/v1/repo/branch.go
index f2386a607e..677105bdb5 100644
--- a/routers/api/v1/repo/branch.go
+++ b/routers/api/v1/repo/branch.go
@@ -251,12 +251,11 @@ func CreateBranch(ctx *context.APIContext) {
 		}
 	}
 
-	err = repo_service.CreateNewBranchFromCommit(ctx, ctx.Doer, ctx.Repo.Repository, oldCommit.ID.String(), opt.BranchName)
+	err = repo_service.CreateNewBranchFromCommit(ctx, ctx.Doer, ctx.Repo.Repository, ctx.Repo.GitRepo, oldCommit.ID.String(), opt.BranchName)
 	if err != nil {
 		if git_model.IsErrBranchNotExist(err) {
 			ctx.Error(http.StatusNotFound, "", "The old branch does not exist")
-		}
-		if models.IsErrTagAlreadyExists(err) {
+		} else if models.IsErrTagAlreadyExists(err) {
 			ctx.Error(http.StatusConflict, "", "The branch with the same tag already exists.")
 		} else if git_model.IsErrBranchAlreadyExists(err) || git.IsErrPushOutOfDate(err) {
 			ctx.Error(http.StatusConflict, "", "The branch already exists.")
diff --git a/routers/web/repo/branch.go b/routers/web/repo/branch.go
index bc72d5f2ec..a0bc1dadad 100644
--- a/routers/web/repo/branch.go
+++ b/routers/web/repo/branch.go
@@ -191,9 +191,9 @@ func CreateBranch(ctx *context.Context) {
 		}
 		err = release_service.CreateNewTag(ctx, ctx.Doer, ctx.Repo.Repository, target, form.NewBranchName, "")
 	} else if ctx.Repo.IsViewBranch {
-		err = repo_service.CreateNewBranch(ctx, ctx.Doer, ctx.Repo.Repository, ctx.Repo.BranchName, form.NewBranchName)
+		err = repo_service.CreateNewBranch(ctx, ctx.Doer, ctx.Repo.Repository, ctx.Repo.GitRepo, ctx.Repo.BranchName, form.NewBranchName)
 	} else {
-		err = repo_service.CreateNewBranchFromCommit(ctx, ctx.Doer, ctx.Repo.Repository, ctx.Repo.CommitID, form.NewBranchName)
+		err = repo_service.CreateNewBranchFromCommit(ctx, ctx.Doer, ctx.Repo.Repository, ctx.Repo.GitRepo, ctx.Repo.CommitID, form.NewBranchName)
 	}
 	if err != nil {
 		if models.IsErrProtectedTagName(err) {
diff --git a/services/repository/branch.go b/services/repository/branch.go
index 735fa1a756..6dc286675f 100644
--- a/services/repository/branch.go
+++ b/services/repository/branch.go
@@ -20,6 +20,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/queue"
 	repo_module "code.gitea.io/gitea/modules/repository"
+	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 	notify_service "code.gitea.io/gitea/services/notify"
 	files_service "code.gitea.io/gitea/services/repository/files"
@@ -28,35 +29,13 @@ import (
 )
 
 // CreateNewBranch creates a new repository branch
-func CreateNewBranch(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, oldBranchName, branchName string) (err error) {
-	err = repo.MustNotBeArchived()
+func CreateNewBranch(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, gitRepo *git.Repository, oldBranchName, branchName string) (err error) {
+	branch, err := git_model.GetBranch(ctx, repo.ID, oldBranchName)
 	if err != nil {
 		return err
 	}
 
-	// Check if branch name can be used
-	if err := checkBranchName(ctx, repo, branchName); err != nil {
-		return err
-	}
-
-	if !git.IsBranchExist(ctx, repo.RepoPath(), oldBranchName) {
-		return git_model.ErrBranchNotExist{
-			BranchName: oldBranchName,
-		}
-	}
-
-	if err := git.Push(ctx, repo.RepoPath(), git.PushOptions{
-		Remote: repo.RepoPath(),
-		Branch: fmt.Sprintf("%s%s:%s%s", git.BranchPrefix, oldBranchName, git.BranchPrefix, branchName),
-		Env:    repo_module.PushingEnvironment(doer, repo),
-	}); err != nil {
-		if git.IsErrPushOutOfDate(err) || git.IsErrPushRejected(err) {
-			return err
-		}
-		return fmt.Errorf("push: %w", err)
-	}
-
-	return nil
+	return CreateNewBranchFromCommit(ctx, doer, repo, gitRepo, branch.CommitID, branchName)
 }
 
 // Branch contains the branch information
@@ -249,8 +228,49 @@ func checkBranchName(ctx context.Context, repo *repo_model.Repository, name stri
 	return err
 }
 
+// syncBranchToDB sync the branch information in the database. It will try to update the branch first,
+// if updated success with affect records > 0, then all are done. Because that means the branch has been in the database.
+// If no record is affected, that means the branch does not exist in database. So there are two possibilities.
+// One is this is a new branch, then we just need to insert the record. Another is the branches haven't been synced,
+// then we need to sync all the branches into database.
+func syncBranchToDB(ctx context.Context, repoID, pusherID int64, branchName string, commit *git.Commit) error {
+	cnt, err := git_model.UpdateBranch(ctx, repoID, pusherID, branchName, commit)
+	if err != nil {
+		return fmt.Errorf("git_model.UpdateBranch %d:%s failed: %v", repoID, branchName, err)
+	}
+	if cnt > 0 { // This means branch does exist, so it's a normal update. It also means the branch has been synced.
+		return nil
+	}
+
+	// if user haven't visit UI but directly push to a branch after upgrading from 1.20 -> 1.21,
+	// we cannot simply insert the branch but need to check we have branches or not
+	hasBranch, err := db.Exist[git_model.Branch](ctx, git_model.FindBranchOptions{
+		RepoID:          repoID,
+		IsDeletedBranch: util.OptionalBoolFalse,
+	}.ToConds())
+	if err != nil {
+		return err
+	}
+	if !hasBranch {
+		if _, err = repo_module.SyncRepoBranches(ctx, repoID, pusherID); err != nil {
+			return fmt.Errorf("repo_module.SyncRepoBranches %d:%s failed: %v", repoID, branchName, err)
+		}
+		return nil
+	}
+
+	// if database have branches but not this branch, it means this is a new branch
+	return db.Insert(ctx, &git_model.Branch{
+		RepoID:        repoID,
+		Name:          branchName,
+		CommitID:      commit.ID.String(),
+		CommitMessage: commit.Summary(),
+		PusherID:      pusherID,
+		CommitTime:    timeutil.TimeStamp(commit.Committer.When.Unix()),
+	})
+}
+
 // CreateNewBranchFromCommit creates a new repository branch
-func CreateNewBranchFromCommit(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, commit, branchName string) (err error) {
+func CreateNewBranchFromCommit(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, gitRepo *git.Repository, commitID, branchName string) (err error) {
 	err = repo.MustNotBeArchived()
 	if err != nil {
 		return err
@@ -261,18 +281,28 @@ func CreateNewBranchFromCommit(ctx context.Context, doer *user_model.User, repo
 		return err
 	}
 
-	if err := git.Push(ctx, repo.RepoPath(), git.PushOptions{
-		Remote: repo.RepoPath(),
-		Branch: fmt.Sprintf("%s:%s%s", commit, git.BranchPrefix, branchName),
-		Env:    repo_module.PushingEnvironment(doer, repo),
-	}); err != nil {
-		if git.IsErrPushOutOfDate(err) || git.IsErrPushRejected(err) {
+	return db.WithTx(ctx, func(ctx context.Context) error {
+		commit, err := gitRepo.GetCommit(commitID)
+		if err != nil {
+			return err
+		}
+		// database operation should be done before git operation so that we can rollback if git operation failed
+		if err := syncBranchToDB(ctx, repo.ID, doer.ID, branchName, commit); err != nil {
 			return err
 		}
-		return fmt.Errorf("push: %w", err)
-	}
 
-	return nil
+		if err := git.Push(ctx, repo.RepoPath(), git.PushOptions{
+			Remote: repo.RepoPath(),
+			Branch: fmt.Sprintf("%s:%s%s", commitID, git.BranchPrefix, branchName),
+			Env:    repo_module.PushingEnvironment(doer, repo),
+		}); err != nil {
+			if git.IsErrPushOutOfDate(err) || git.IsErrPushRejected(err) {
+				return err
+			}
+			return fmt.Errorf("push: %w", err)
+		}
+		return nil
+	})
 }
 
 // RenameBranch rename a branch
diff --git a/services/repository/push.go b/services/repository/push.go
index 391c8ad4ca..b5388834c0 100644
--- a/services/repository/push.go
+++ b/services/repository/push.go
@@ -259,7 +259,7 @@ func pushUpdates(optsList []*repo_module.PushUpdateOptions) error {
 					commits.Commits = commits.Commits[:setting.UI.FeedMaxCommitNum]
 				}
 
-				if err = git_model.UpdateBranch(ctx, repo.ID, opts.PusherID, branch, newCommit); err != nil {
+				if err = syncBranchToDB(ctx, repo.ID, opts.PusherID, branch, newCommit); err != nil {
 					return fmt.Errorf("git_model.UpdateBranch %s:%s failed: %v", repo.FullName(), branch, err)
 				}
 
diff --git a/tests/integration/api_repo_get_contents_list_test.go b/tests/integration/api_repo_get_contents_list_test.go
index f3a5159115..7874eddfd4 100644
--- a/tests/integration/api_repo_get_contents_list_test.go
+++ b/tests/integration/api_repo_get_contents_list_test.go
@@ -70,15 +70,16 @@ func testAPIGetContentsList(t *testing.T, u *url.URL) {
 	session = loginUser(t, user4.Name)
 	token4 := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeReadRepository)
 
-	// Make a new branch in repo1
-	newBranch := "test_branch"
-	err := repo_service.CreateNewBranch(git.DefaultContext, user2, repo1, repo1.DefaultBranch, newBranch)
-	assert.NoError(t, err)
 	// Get the commit ID of the default branch
 	gitRepo, err := git.OpenRepository(git.DefaultContext, repo1.RepoPath())
 	assert.NoError(t, err)
 	defer gitRepo.Close()
 
+	// Make a new branch in repo1
+	newBranch := "test_branch"
+	err = repo_service.CreateNewBranch(git.DefaultContext, user2, repo1, gitRepo, repo1.DefaultBranch, newBranch)
+	assert.NoError(t, err)
+
 	commitID, _ := gitRepo.GetBranchCommitID(repo1.DefaultBranch)
 	// Make a new tag in repo1
 	newTag := "test_tag"
diff --git a/tests/integration/api_repo_get_contents_test.go b/tests/integration/api_repo_get_contents_test.go
index 709bbe082a..1d708a4cdb 100644
--- a/tests/integration/api_repo_get_contents_test.go
+++ b/tests/integration/api_repo_get_contents_test.go
@@ -72,15 +72,16 @@ func testAPIGetContents(t *testing.T, u *url.URL) {
 	session = loginUser(t, user4.Name)
 	token4 := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeReadRepository)
 
-	// Make a new branch in repo1
-	newBranch := "test_branch"
-	err := repo_service.CreateNewBranch(git.DefaultContext, user2, repo1, repo1.DefaultBranch, newBranch)
-	assert.NoError(t, err)
 	// Get the commit ID of the default branch
 	gitRepo, err := git.OpenRepository(git.DefaultContext, repo1.RepoPath())
 	assert.NoError(t, err)
 	defer gitRepo.Close()
 
+	// Make a new branch in repo1
+	newBranch := "test_branch"
+	err = repo_service.CreateNewBranch(git.DefaultContext, user2, repo1, gitRepo, repo1.DefaultBranch, newBranch)
+	assert.NoError(t, err)
+
 	commitID, err := gitRepo.GetBranchCommitID(repo1.DefaultBranch)
 	assert.NoError(t, err)
 	// Make a new tag in repo1