first-commit

modules/git/repo_commitgraph_gogit.go

@@ -0,0 +1,37 @@
+// Copyright 2019 The Gitea Authors.
+// All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build gogit
+
+package git
+
+import (
+	"os"
+	"path/filepath"
+
+	gitealog "code.gitea.io/gitea/modules/log"
+
+	commitgraph "github.com/go-git/go-git/v5/plumbing/format/commitgraph/v2"
+	cgobject "github.com/go-git/go-git/v5/plumbing/object/commitgraph"
+)
+
+// CommitNodeIndex returns the index for walking commit graph
+func (r *Repository) CommitNodeIndex() (cgobject.CommitNodeIndex, *os.File) {
+	indexPath := filepath.Join(r.Path, "objects", "info", "commit-graph")
+
+	file, err := os.Open(indexPath)
+	if err == nil {
+		var index commitgraph.Index
+		index, err = commitgraph.OpenFileIndex(file)
+		if err == nil {
+			return cgobject.NewGraphCommitNodeIndex(index, r.gogitRepo.Storer), file
+		}
+	}
+
+	if !os.IsNotExist(err) {
+		gitealog.Warn("Unable to read commit-graph for %s: %v", r.Path, err)
+	}
+
+	return cgobject.NewObjectCommitNodeIndex(r.gogitRepo.Storer), nil
+}