Always use git command but not os.Command (#18363)

1 files changed, 22 insertions, 25 deletions

diff --git a/services/gitdiff/gitdiff.go b/services/gitdiff/gitdiff.go
index 25d5e139d9..80e706b5ed 100644
--- a/services/gitdiff/gitdiff.go
+++ b/services/gitdiff/gitdiff.go
@@ -15,7 +15,6 @@ import (
 	"io"
 	"net/url"
 	"os"
-	"os/exec"
 	"regexp"
 	"sort"
 	"strings"
@@ -30,7 +29,6 @@ import (
 	"code.gitea.io/gitea/modules/highlight"
 	"code.gitea.io/gitea/modules/lfs"
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/setting"
 
 	"github.com/sergi/go-diff/diffmatchpatch"
@@ -1322,10 +1320,6 @@ func GetDiff(gitRepo *git.Repository, opts *DiffOptions, files ...string) (*Diff
 		return nil, err
 	}
 
-	timeout := time.Duration(setting.Git.Timeout.Default) * time.Second
-	ctx, _, finished := process.GetManager().AddContextTimeout(gitRepo.Ctx, timeout, fmt.Sprintf("GetDiffRange [repo_path: %s]", repoPath))
-	defer finished()
-
 	argsLength := 6
 	if len(opts.WhitespaceBehavior) > 0 {
 		argsLength++
@@ -1375,21 +1369,28 @@ func GetDiff(gitRepo *git.Repository, opts *DiffOptions, files ...string) (*Diff
 		diffArgs = append(diffArgs, files...)
 	}
 
-	cmd := exec.CommandContext(ctx, git.GitExecutable, diffArgs...)
-
-	cmd.Dir = repoPath
-	cmd.Stderr = os.Stderr
+	reader, writer := io.Pipe()
+	defer func() {
+		_ = reader.Close()
+		_ = writer.Close()
+	}()
 
-	stdout, err := cmd.StdoutPipe()
-	if err != nil {
-		return nil, fmt.Errorf("error creating StdoutPipe: %w", err)
-	}
+	go func(ctx context.Context, diffArgs []string, repoPath string, writer *io.PipeWriter) {
+		cmd := git.NewCommandContextNoGlobals(ctx, diffArgs...)
+		cmd.SetDescription(fmt.Sprintf("GetDiffRange [repo_path: %s]", repoPath))
+		if err := cmd.RunWithContext(&git.RunContext{
+			Timeout: time.Duration(setting.Git.Timeout.Default) * time.Second,
+			Dir:     repoPath,
+			Stderr:  os.Stderr,
+			Stdout:  writer,
+		}); err != nil {
+			log.Error("error during RunWithContext: %w", err)
+		}
 
-	if err = cmd.Start(); err != nil {
-		return nil, fmt.Errorf("error during Start: %w", err)
-	}
+		_ = writer.Close()
+	}(gitRepo.Ctx, diffArgs, repoPath, writer)
 
-	diff, err := ParsePatch(opts.MaxLines, opts.MaxLineCharacters, opts.MaxFiles, stdout, parsePatchSkipToFile)
+	diff, err := ParsePatch(opts.MaxLines, opts.MaxLineCharacters, opts.MaxFiles, reader, parsePatchSkipToFile)
 	if err != nil {
 		return nil, fmt.Errorf("unable to ParsePatch: %w", err)
 	}
@@ -1408,7 +1409,7 @@ func GetDiff(gitRepo *git.Repository, opts *DiffOptions, files ...string) (*Diff
 				IndexFile:  indexFilename,
 				WorkTree:   worktree,
 			}
-			ctx, cancel := context.WithCancel(ctx)
+			ctx, cancel := context.WithCancel(gitRepo.Ctx)
 			if err := checker.Init(ctx); err != nil {
 				log.Error("Unable to open checker for %s. Error: %v", opts.AfterCommitID, err)
 			} else {
@@ -1472,10 +1473,6 @@ func GetDiff(gitRepo *git.Repository, opts *DiffOptions, files ...string) (*Diff
 		}
 	}
 
-	if err = cmd.Wait(); err != nil {
-		return nil, fmt.Errorf("error during cmd.Wait: %w", err)
-	}
-
 	separator := "..."
 	if opts.DirectComparison {
 		separator = ".."
@@ -1485,12 +1482,12 @@ func GetDiff(gitRepo *git.Repository, opts *DiffOptions, files ...string) (*Diff
 	if len(opts.BeforeCommitID) == 0 || opts.BeforeCommitID == git.EmptySHA {
 		shortstatArgs = []string{git.EmptyTreeSHA, opts.AfterCommitID}
 	}
-	diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(ctx, repoPath, shortstatArgs...)
+	diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(gitRepo.Ctx, repoPath, shortstatArgs...)
 	if err != nil && strings.Contains(err.Error(), "no merge base") {
 		// git >= 2.28 now returns an error if base and head have become unrelated.
 		// previously it would return the results of git diff --shortstat base head so let's try that...
 		shortstatArgs = []string{opts.BeforeCommitID, opts.AfterCommitID}
-		diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(ctx, repoPath, shortstatArgs...)
+		diff.NumFiles, diff.TotalAddition, diff.TotalDeletion, err = git.GetDiffShortStat(gitRepo.Ctx, repoPath, shortstatArgs...)
 	}
 	if err != nil {
 		return nil, err