// Copyright 2025 The Forgejo Authors. All rights reserved.// SPDX-License-Identifier: GPL-3.0-or-laterpackage git import (	"bytes"	"context"	"fmt"	"os" 	"forgejo.org/modules/log"	"forgejo.org/modules/util") // CheckIfDiffDiffers returns if the diff of the newCommitID and// oldCommitID with the merge base of the base branch has changed.//// Informally it checks if the following two diffs are exactly the same in their// contents, thus ignoring different commit IDs, headers and messages:// 1. git diff --merge-base baseReference newCommitID// 2. git diff --merge-base baseReference oldCommitIDfunc (repo *Repository) CheckIfDiffDiffers(base, oldCommitID, newCommitID string, env []string) (hasChanged bool, err error) {	cmd := NewCommand(repo.Ctx, "diff", "--name-only", "-z").AddDynamicArguments(newCommitID, oldCommitID, base)	stdoutReader, stdoutWriter, err := os.Pipe()	if err != nil {		return false, fmt.Errorf("unable to open pipe for to run diff: %w", err)	} 	stderr := new(bytes.Buffer)	if err := cmd.Run(&RunOpts{		Dir:    repo.Path,		Stdout: stdoutWriter,		Stderr: stderr,		PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {			_ = stdoutWriter.Close()			defer func() {				_ = stdoutReader.Close()			}()			return util.IsEmptyReader(stdoutReader)		},	}); err != nil {		if err == util.ErrNotEmpty {			return true, nil		}		err = ConcatenateError(err, stderr.String()) 		log.Error("Unable to run git diff on %s %s %s in %q: Error: %v",			newCommitID, oldCommitID, base,			repo.Path,			err) 		return false, fmt.Errorf("Unable to run git diff --name-only -z %s %s %s: %w", newCommitID, oldCommitID, base, err)	} 	return false, nil}