[PORT] Fix git error handling (gitea#32401)

---
Conflict resolution: Trivial, for `repo_attributes.go` move where the
`IsErrCanceledOrKilled` needs to happen because of other changes that
happened in this file.

To add some words to this change: It seems to be mostly simplifying the
error handling of git operations.

(cherry picked from commit e524f63d58900557d7d57fc3bcd19d9facc8b8ee)

services/gitdiff/gitdiff.go

@@ -1159,7 +1159,7 @@ func GetDiff(ctx context.Context, gitRepo *git.Repository, opts *DiffOptions, fi
 			Dir:     repoPath,
 			Stdout:  writer,
 			Stderr:  stderr,
-		}); err != nil {
+		}); err != nil && !git.IsErrCanceledOrKilled(err) {
 			log.Error("error during GetDiff(git diff dir: %s): %v, stderr: %s", repoPath, err, stderr.String())
 		}
 

services/mirror/mirror_pull.go

@@ -604,14 +604,8 @@ func checkAndUpdateEmptyRepository(ctx context.Context, m *repo_model.Mirror, re
 		}
 		// Update the git repository default branch
 		if err := gitrepo.SetDefaultBranch(ctx, m.Repo, m.Repo.DefaultBranch); err != nil {
-			if !git.IsErrUnsupportedVersion(err) {
-				log.Error("Failed to update default branch of underlying git repository %-v. Error: %v", m.Repo, err)
-				desc := fmt.Sprintf("Failed to update default branch of underlying git repository '%s': %v", m.Repo.RepoPath(), err)
-				if err = system_model.CreateRepositoryNotice(desc); err != nil {
-					log.Error("CreateRepositoryNotice: %v", err)
-				}
-				return false
-			}
+			log.Error("Failed to update default branch of underlying git repository %-v. Error: %v", m.Repo, err)
+			return false
 		}
 		m.Repo.IsEmpty = false
 		// Update the is empty and default_branch columns

services/repository/branch.go

@@ -588,12 +588,7 @@ func SetRepoDefaultBranch(ctx context.Context, repo *repo_model.Repository, gitR
 			log.Error("CancelPreviousJobs: %v", err)
 		}
 
-		if err := gitrepo.SetDefaultBranch(ctx, repo, newBranchName); err != nil {
-			if !git.IsErrUnsupportedVersion(err) {
-				return err
-			}
-		}
-		return nil
+		return gitrepo.SetDefaultBranch(ctx, repo, newBranchName)
 	}); err != nil {
 		return err
 	}

services/repository/files/temp_repo.go

@@ -343,8 +343,7 @@ func (t *TemporaryUploadRepository) Push(doer *user_model.User, commitHash, bran
 func (t *TemporaryUploadRepository) DiffIndex() (*gitdiff.Diff, error) {
 	stdoutReader, stdoutWriter, err := os.Pipe()
 	if err != nil {
-		log.Error("Unable to open stdout pipe: %v", err)
-		return nil, fmt.Errorf("Unable to open stdout pipe: %w", err)
+		return nil, fmt.Errorf("unable to open stdout pipe: %w", err)
 	}
 	defer func() {
 		_ = stdoutReader.Close()
@@ -352,9 +351,7 @@ func (t *TemporaryUploadRepository) DiffIndex() (*gitdiff.Diff, error) {
 	}()
 	stderr := new(bytes.Buffer)
 	var diff *gitdiff.Diff
-	var finalErr error
-
-	if err := git.NewCommand(t.ctx, "diff-index", "--src-prefix=\\a/", "--dst-prefix=\\b/", "--cached", "-p", "HEAD").
+	err = git.NewCommand(t.ctx, "diff-index", "--src-prefix=\\a/", "--dst-prefix=\\b/", "--cached", "-p", "HEAD").
 		Run(&git.RunOpts{
 			Timeout: 30 * time.Second,
 			Dir:     t.basePath,
@@ -362,23 +359,20 @@ func (t *TemporaryUploadRepository) DiffIndex() (*gitdiff.Diff, error) {
 			Stderr:  stderr,
 			PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
 				_ = stdoutWriter.Close()
-				diff, finalErr = gitdiff.ParsePatch(t.ctx, setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, stdoutReader, "")
-				if finalErr != nil {
-					log.Error("ParsePatch: %v", finalErr)
-					cancel()
-				}
+				defer cancel()
+				var diffErr error
+				diff, diffErr = gitdiff.ParsePatch(t.ctx, setting.Git.MaxGitDiffLines, setting.Git.MaxGitDiffLineCharacters, setting.Git.MaxGitDiffFiles, stdoutReader, "")
 				_ = stdoutReader.Close()
-				return finalErr
+				if diffErr != nil {
+					// if the diffErr is not nil, it will be returned as the error of "Run()"
+					return fmt.Errorf("ParsePatch: %w", diffErr)
+				}
+				return nil
 			},
-		}); err != nil {
-		if finalErr != nil {
-			log.Error("Unable to ParsePatch in temporary repo %s (%s). Error: %v", t.repo.FullName(), t.basePath, finalErr)
-			return nil, finalErr
-		}
-		log.Error("Unable to run diff-index pipeline in temporary repo %s (%s). Error: %v\nStderr: %s",
-			t.repo.FullName(), t.basePath, err, stderr)
-		return nil, fmt.Errorf("Unable to run diff-index pipeline in temporary repo %s. Error: %w\nStderr: %s",
-			t.repo.FullName(), err, stderr)
+		})
+	if err != nil && !git.IsErrCanceledOrKilled(err) {
+		log.Error("Unable to diff-index in temporary repo %s (%s). Error: %v\nStderr: %s", t.repo.FullName(), t.basePath, err, stderr)
+		return nil, fmt.Errorf("unable to run diff-index pipeline in temporary repo: %w", err)
 	}
 
 	diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(t.ctx, t.basePath, git.TrustedCmdArgs{"--cached"}, "HEAD")

services/repository/push.go

@@ -183,9 +183,7 @@ func pushUpdates(optsList []*repo_module.PushUpdateOptions) error {
 						repo.IsEmpty = false
 						if repo.DefaultBranch != setting.Repository.DefaultBranch {
 							if err := gitrepo.SetDefaultBranch(ctx, repo, repo.DefaultBranch); err != nil {
-								if !git.IsErrUnsupportedVersion(err) {
-									return err
-								}
+								return err
 							}
 						}
 						// Update the is empty and default_branch columns