gitech

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// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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//go:build !gogit
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package git
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import (
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	"context"
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	"io"
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	"strings"
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	"code.gitea.io/gitea/modules/log"
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)
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// GetNote retrieves the git-notes data for a given commit.
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// FIXME: Add LastCommitCache support
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func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note) error {
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	log.Trace("Searching for git note corresponding to the commit %q in the repository %q", commitID, repo.Path)
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	notes, err := repo.GetCommit(NotesRef)
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	if err != nil {
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		if IsErrNotExist(err) {
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			return err
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		}
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		log.Error("Unable to get commit from ref %q. Error: %v", NotesRef, err)
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		return err
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	}
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	path := ""
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	tree := &notes.Tree
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	log.Trace("Found tree with ID %q while searching for git note corresponding to the commit %q", tree.ID, commitID)
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	var entry *TreeEntry
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	originalCommitID := commitID
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	for len(commitID) > 2 {
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		entry, err = tree.GetTreeEntryByPath(commitID)
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		if err == nil {
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			path += commitID
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			break
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		}
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		if IsErrNotExist(err) {
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			tree, err = tree.SubTree(commitID[0:2])
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			path += commitID[0:2] + "/"
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			commitID = commitID[2:]
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		}
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		if err != nil {
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			// Err may have been updated by the SubTree we need to recheck if it's again an ErrNotExist
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			if !IsErrNotExist(err) {
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				log.Error("Unable to find git note corresponding to the commit %q. Error: %v", originalCommitID, err)
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			}
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			return err
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		}
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	}
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	blob := entry.Blob()
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	dataRc, err := blob.DataAsync()
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	if err != nil {
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		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
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		return err
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	}
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	closed := false
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	defer func() {
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		if !closed {
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			_ = dataRc.Close()
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		}
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	}()
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	d, err := io.ReadAll(dataRc)
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	if err != nil {
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		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
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		return err
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	}
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	_ = dataRc.Close()
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	closed = true
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	note.Message = d
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	treePath := ""
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	if idx := strings.LastIndex(path, "/"); idx > -1 {
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		treePath = path[:idx]
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		path = path[idx+1:]
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	}
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	lastCommits, err := GetLastCommitForPaths(ctx, notes, treePath, []string{path})
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	if err != nil {
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		log.Error("Unable to get the commit for the path %q. Error: %v", treePath, err)
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		return err
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	}
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	note.Commit = lastCommits[path]
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	return nil
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}
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