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// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// +build !gogit
package git
import (
"bufio"
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
// ResolveReference resolves a name to a reference
func (repo *Repository) ResolveReference(name string) (string, error) {
stdout, err := NewCommand("show-ref", "--hash", name).RunInDir(repo.Path)
if err != nil {
if strings.Contains(err.Error(), "not a valid ref") {
return "", ErrNotExist{name, ""}
}
return "", err
}
stdout = strings.TrimSpace(stdout)
if stdout == "" {
return "", ErrNotExist{name, ""}
}
return stdout, nil
}
// GetRefCommitID returns the last commit ID string of given reference (branch or tag).
func (repo *Repository) GetRefCommitID(name string) (string, error) {
if strings.HasPrefix(name, "refs/") {
// We're gonna try just reading the ref file as this is likely to be quicker than other options
fileInfo, err := os.Lstat(filepath.Join(repo.Path, name))
if err == nil && fileInfo.Mode().IsRegular() && fileInfo.Size() == 41 {
ref, err := ioutil.ReadFile(filepath.Join(repo.Path, name))
if err == nil && SHAPattern.Match(ref[:40]) && ref[40] == '\n' {
return string(ref[:40]), nil
}
}
}
stdout, err := NewCommand("show-ref", "--verify", "--hash", name).RunInDir(repo.Path)
if err != nil {
if strings.Contains(err.Error(), "not a valid ref") {
return "", ErrNotExist{name, ""}
}
return "", err
}
return strings.TrimSpace(stdout), nil
}
// IsCommitExist returns true if given commit exists in current repository.
func (repo *Repository) IsCommitExist(name string) bool {
_, err := NewCommand("cat-file", "-e", name).RunInDir(repo.Path)
return err == nil
}
func (repo *Repository) getCommit(id SHA1) (*Commit, error) {
stdoutReader, stdoutWriter := io.Pipe()
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
go func() {
stderr := strings.Builder{}
err := NewCommand("cat-file", "--batch").RunInDirFullPipeline(repo.Path, stdoutWriter, &stderr, strings.NewReader(id.String()+"\n"))
if err != nil {
_ = stdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
} else {
_ = stdoutWriter.Close()
}
}()
bufReader := bufio.NewReader(stdoutReader)
return repo.getCommitFromBatchReader(bufReader, id)
}
func (repo *Repository) getCommitFromBatchReader(bufReader *bufio.Reader, id SHA1) (*Commit, error) {
_, typ, size, err := ReadBatchLine(bufReader)
if err != nil {
if errors.Is(err, io.EOF) {
return nil, ErrNotExist{ID: id.String()}
}
return nil, err
}
switch typ {
case "missing":
return nil, ErrNotExist{ID: id.String()}
case "tag":
// then we need to parse the tag
// and load the commit
data, err := ioutil.ReadAll(io.LimitReader(bufReader, size))
if err != nil {
return nil, err
}
tag, err := parseTagData(data)
if err != nil {
return nil, err
}
tag.repo = repo
commit, err := tag.Commit()
if err != nil {
return nil, err
}
commit.CommitMessage = strings.TrimSpace(tag.Message)
commit.Author = tag.Tagger
commit.Signature = tag.Signature
return commit, nil
case "commit":
return CommitFromReader(repo, id, io.LimitReader(bufReader, size))
default:
log("Unknown typ: %s", typ)
return nil, ErrNotExist{
ID: id.String(),
}
}
}
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