enhance!: raise minimum git version to 2.34 (#39565)

Raise the minimum git version to 2.34, the version in Ubuntu 22.04,
Debian 12 and RHEL 8 ship newer, and remove the fallbacks it makes
obsolete.

- Always enable AGit
- Use `diff --skip-to` and `apply -3` unconditionally
- Set the default branch of new repos and wikis via `git init
--initial-branch`
- Detect rebase conflicts via `REBASE_HEAD`

modules/git/config.go

@@ -73,15 +73,9 @@ func syncGitConfig(ctx context.Context) (err error) {
 		return err
 	}
 
-	if DefaultFeatures().SupportProcReceive {
-		// set support for AGit flow
-		if err := configAddNonExist(ctx, "receive.procReceiveRefs", "refs/for"); err != nil {
-			return err
-		}
-	} else {
-		if err := configUnsetAll(ctx, "receive.procReceiveRefs", "refs/for"); err != nil {
-			return err
-		}
+	// set support for AGit flow
+	if err := configAddNonExist(ctx, "receive.procReceiveRefs", "refs/for"); err != nil {
+		return err
 	}
 
 	// Due to CVE-2022-24765, git now denies access to git directories which are not owned by current user.

modules/git/fastimport.go

@@ -40,7 +40,7 @@ func ForceFastImportWithInit(ctx context.Context, repoLocalPath string, commits
 	dirEntries, err := os.ReadDir(repoLocalPath)
 	if os.IsNotExist(err) || (err == nil && len(dirEntries) == 0) {
 		_ = os.MkdirAll(repoLocalPath, 0o755)
-		err := InitRepositoryLocal(ctx, repoLocalPath, initOpt.Bare, util.IfZero(initOpt.ObjectFormat, "sha1"))
+		err := InitRepositoryLocal(ctx, repoLocalPath, initOpt.Bare, util.IfZero(initOpt.ObjectFormat, "sha1"), "")
 		if err != nil {
 			return nil, err
 		}

modules/git/git.go

@@ -24,12 +24,11 @@ import (
 	"github.com/hashicorp/go-version"
 )
 
-const RequiredVersion = "2.25.0" // the minimum Git version required
+const RequiredVersion = "2.34.0" // the minimum Git version required
 
 type Features struct {
 	gitVersion *version.Version
 
-	SupportProcReceive         bool           // >= 2.29
 	SupportHashSha256          bool           // >= 2.42, SHA-256 repositories no longer an ‘experimental curiosity’
 	SupportedObjectFormats     []ObjectFormat // sha1, sha256
 	SupportCheckAttrOnBare     bool           // >= 2.40
@@ -79,7 +78,6 @@ func loadGitVersionFeatures() (*Features, error) {
 	}
 
 	features := &Features{gitVersion: ver}
-	features.SupportProcReceive = features.CheckVersionAtLeast("2.29")
 	features.SupportHashSha256 = features.CheckVersionAtLeast("2.42")
 	features.SupportedObjectFormats = []ObjectFormat{Sha1ObjectFormat}
 	if features.SupportHashSha256 {

modules/git/gitcmd/error.go

@@ -94,8 +94,7 @@ const (
 	StderrBadRevision        StderrPrefix = "fatal: bad revision"
 	StderrNoSuchPath         StderrPrefix = "fatal: no such path"
 
-	StderrNoSuchRemote1 StderrPrefix = "fatal: no such remote" // git < 2.30, exit status 128
-	StderrNoSuchRemote2 StderrPrefix = "error: no such remote" // git >= 2.30. exit status 2
+	StderrNoSuchRemote StderrPrefix = "error: no such remote"
 
 	StderrAuthenticationFailed StderrPrefix = "fatal: Authentication failed for"
 	StderrCouldNotReadUsername StderrPrefix = "fatal: could not read Username"

modules/git/localfs.go

@@ -38,8 +38,8 @@ func RenameRepository(ctx context.Context, repo, newRepo RepositoryFacade) error
 	return nil
 }
 
-func InitRepository(ctx context.Context, repo RepositoryFacade, objectFormatName string) error {
-	return InitRepositoryLocal(ctx, gitrepo.RepoLocalPath(repo), true, objectFormatName)
+func InitRepository(ctx context.Context, repo RepositoryFacade, objectFormatName, initialBranch string) error {
+	return InitRepositoryLocal(ctx, gitrepo.RepoLocalPath(repo), true, objectFormatName, initialBranch)
 }
 
 func IsRepoFileExist(ctx context.Context, repo RepositoryFacade, relativeFilePath string) (bool, error) {

modules/git/remote.go

@@ -66,7 +66,7 @@ func (err *ErrInvalidCloneAddr) Unwrap() error {
 
 // IsRemoteNotExistError checks the prefix of the error message to see whether a remote does not exist.
 func IsRemoteNotExistError(err error) bool {
-	return gitcmd.IsStderr(err, gitcmd.StderrNoSuchRemote1, gitcmd.StderrNoSuchRemote2)
+	return gitcmd.IsStderr(err, gitcmd.StderrNoSuchRemote)
 }
 
 // ParseRemoteAddr checks if given remote address is valid,

modules/git/remote_test.go

@@ -0,0 +1,15 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsRemoteNotExistError(t *testing.T) {
+	_, err := GetRemoteAddress(t.Context(), mockRepository("repo1_bare"), "no-such-remote")
+	assert.True(t, IsRemoteNotExistError(err))
+}

modules/git/repo.go

@@ -118,7 +118,7 @@ func IsRepoURLAccessible(ctx context.Context, url string) bool {
 }
 
 // InitRepositoryLocal initializes a new Git repository.
-func InitRepositoryLocal(ctx context.Context, localRepoPath string, bare bool, objectFormatName string) error {
+func InitRepositoryLocal(ctx context.Context, localRepoPath string, bare bool, objectFormatName, initialBranch string) error {
 	err := os.MkdirAll(localRepoPath, os.ModePerm)
 	if err != nil {
 		return err
@@ -132,6 +132,9 @@ func InitRepositoryLocal(ctx context.Context, localRepoPath string, bare bool, o
 	if DefaultFeatures().SupportHashSha256 {
 		cmd.AddOptionValues("--object-format", objectFormatName)
 	}
+	if initialBranch != "" {
+		cmd.AddOptionValues("--initial-branch", initialBranch)
+	}
 
 	if bare {
 		cmd.AddArguments("--bare")