github.com/gitbundle/modules@v0.0.0-20231025071548-85b91c5c3b01/git/notes_nogogit.go (about)

     1  // Copyright 2023 The GitBundle Inc. All rights reserved.
     2  // Copyright 2017 The Gitea Authors. All rights reserved.
     3  // Use of this source code is governed by a MIT-style
     4  // license that can be found in the LICENSE file.
     5  
     6  //go:build !gogit
     7  
     8  package git
     9  
    10  import (
    11  	"context"
    12  	"io"
    13  	"strings"
    14  
    15  	"github.com/gitbundle/modules/log"
    16  )
    17  
    18  // GetNote retrieves the git-notes data for a given commit.
    19  // FIXME: Add LastCommitCache support
    20  func GetNote(ctx context.Context, repo *Repository, commitID string, note *Note) error {
    21  	log.Trace("Searching for git note corresponding to the commit %q in the repository %q", commitID, repo.Path)
    22  	notes, err := repo.GetCommit(NotesRef)
    23  	if err != nil {
    24  		if IsErrNotExist(err) {
    25  			return err
    26  		}
    27  		log.Error("Unable to get commit from ref %q. Error: %v", NotesRef, err)
    28  		return err
    29  	}
    30  
    31  	path := ""
    32  
    33  	tree := &notes.Tree
    34  	log.Trace("Found tree with ID %q while searching for git note corresponding to the commit %q", tree.ID, commitID)
    35  
    36  	var entry *TreeEntry
    37  	originalCommitID := commitID
    38  	for len(commitID) > 2 {
    39  		entry, err = tree.GetTreeEntryByPath(commitID)
    40  		if err == nil {
    41  			path += commitID
    42  			break
    43  		}
    44  		if IsErrNotExist(err) {
    45  			tree, err = tree.SubTree(commitID[0:2])
    46  			path += commitID[0:2] + "/"
    47  			commitID = commitID[2:]
    48  		}
    49  		if err != nil {
    50  			// Err may have been updated by the SubTree we need to recheck if it's again an ErrNotExist
    51  			if !IsErrNotExist(err) {
    52  				log.Error("Unable to find git note corresponding to the commit %q. Error: %v", originalCommitID, err)
    53  			}
    54  			return err
    55  		}
    56  	}
    57  
    58  	blob := entry.Blob()
    59  	dataRc, err := blob.DataAsync()
    60  	if err != nil {
    61  		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
    62  		return err
    63  	}
    64  	closed := false
    65  	defer func() {
    66  		if !closed {
    67  			_ = dataRc.Close()
    68  		}
    69  	}()
    70  	d, err := io.ReadAll(dataRc)
    71  	if err != nil {
    72  		log.Error("Unable to read blob with ID %q. Error: %v", blob.ID, err)
    73  		return err
    74  	}
    75  	_ = dataRc.Close()
    76  	closed = true
    77  	note.Message = d
    78  
    79  	treePath := ""
    80  	if idx := strings.LastIndex(path, "/"); idx > -1 {
    81  		treePath = path[:idx]
    82  		path = path[idx+1:]
    83  	}
    84  
    85  	lastCommits, err := GetLastCommitForPaths(ctx, nil, notes, treePath, []string{path})
    86  	if err != nil {
    87  		log.Error("Unable to get the commit for the path %q. Error: %v", treePath, err)
    88  		return err
    89  	}
    90  	note.Commit = lastCommits[path]
    91  
    92  	return nil
    93  }