first-commit

modules/git/notes_gogit.go

@@ -0,0 +1,89 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+//go:build gogit
+
+package git
+
+import (
+	"context"
+	"io"
+
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+// GetNote retrieves the git-notes data for a given commit.
+// FIXME: Add LastCommitCache support
+func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note) error {
+	log.Trace("Searching for git note corresponding to the commit %q in the repository %q", commitID, repo.Path)
+	notes, err := repo.GetCommit(NotesRef)
+	if err != nil {
+		if IsErrNotExist(err) {
+			return err
+		}
+		log.Error("Unable to get commit from ref %q. Error: %v", NotesRef, err)
+		return err
+	}
+
+	remainingCommitID := commitID
+	path := ""
+	currentTree := notes.Tree.gogitTree
+	log.Trace("Found tree with ID %q while searching for git note corresponding to the commit %q", currentTree.Entries[0].Name, commitID)
+	var file *object.File
+	for len(remainingCommitID) > 2 {
+		file, err = currentTree.File(remainingCommitID)
+		if err == nil {
+			path += remainingCommitID
+			break
+		}
+		if err == object.ErrFileNotFound {
+			currentTree, err = currentTree.Tree(remainingCommitID[0:2])
+			path += remainingCommitID[0:2] + "/"
+			remainingCommitID = remainingCommitID[2:]
+		}
+		if err != nil {
+			if err == object.ErrDirectoryNotFound {
+				return ErrNotExist{ID: remainingCommitID, RelPath: path}
+			}
+			log.Error("Unable to find git note corresponding to the commit %q. Error: %v", commitID, err)
+			return err
+		}
+	}
+
+	blob := file.Blob
+	dataRc, err := blob.Reader()
+	if err != nil {
+		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
+		return err
+	}
+
+	defer dataRc.Close()
+	d, err := io.ReadAll(dataRc)
+	if err != nil {
+		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
+		return err
+	}
+	note.Message = d
+
+	commitNodeIndex, commitGraphFile := repo.CommitNodeIndex()
+	if commitGraphFile != nil {
+		defer commitGraphFile.Close()
+	}
+
+	commitNode, err := commitNodeIndex.Get(plumbing.Hash(notes.ID.RawValue()))
+	if err != nil {
+		return err
+	}
+
+	lastCommits, err := GetLastCommitForPaths(ctx, nil, commitNode, "", []string{path})
+	if err != nil {
+		log.Error("Unable to get the commit for the path %q. Error: %v", path, err)
+		return err
+	}
+	note.Commit = lastCommits[path]
+
+	return nil
+}