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// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2018 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"
"bytes"
"io"
"strings"
"code.gitea.io/gitea/modules/log"
)
// IsObjectExist returns true if given reference exists in the repository.
func (repo *Repository) IsObjectExist(name string) bool {
if name == "" {
return false
}
wr, rd, cancel := repo.CatFileBatchCheck()
defer cancel()
_, err := wr.Write([]byte(name + "\n"))
if err != nil {
log.Debug("Error writing to CatFileBatchCheck %v", err)
return false
}
sha, _, _, err := ReadBatchLine(rd)
return err == nil && bytes.HasPrefix(sha, []byte(strings.TrimSpace(name)))
}
// IsReferenceExist returns true if given reference exists in the repository.
func (repo *Repository) IsReferenceExist(name string) bool {
if name == "" {
return false
}
wr, rd, cancel := repo.CatFileBatchCheck()
defer cancel()
_, err := wr.Write([]byte(name + "\n"))
if err != nil {
log.Debug("Error writing to CatFileBatchCheck %v", err)
return false
}
_, _, _, err = ReadBatchLine(rd)
return err == nil
}
// IsBranchExist returns true if given branch exists in current repository.
func (repo *Repository) IsBranchExist(name string) bool {
if name == "" {
return false
}
return repo.IsReferenceExist(BranchPrefix + name)
}
// GetBranches returns branches from the repository, skipping skip initial branches and
// returning at most limit branches, or all branches if limit is 0.
func (repo *Repository) GetBranches(skip, limit int) ([]string, int, error) {
return callShowRef(repo.Path, BranchPrefix, "--heads", skip, limit)
}
// callShowRef return refs, if limit = 0 it will not limit
func callShowRef(repoPath, prefix, arg string, skip, limit int) (branchNames []string, countAll int, err error) {
stdoutReader, stdoutWriter := io.Pipe()
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
go func() {
stderrBuilder := &strings.Builder{}
err := NewCommand("show-ref", arg).RunInDirPipeline(repoPath, stdoutWriter, stderrBuilder)
if err != nil {
if stderrBuilder.Len() == 0 {
_ = stdoutWriter.Close()
return
}
_ = stdoutWriter.CloseWithError(ConcatenateError(err, stderrBuilder.String()))
} else {
_ = stdoutWriter.Close()
}
}()
i := 0
bufReader := bufio.NewReader(stdoutReader)
for i < skip {
_, isPrefix, err := bufReader.ReadLine()
if err == io.EOF {
return branchNames, i, nil
}
if err != nil {
return nil, 0, err
}
if !isPrefix {
i++
}
}
for limit == 0 || i < skip+limit {
// The output of show-ref is simply a list:
// <sha> SP <ref> LF
_, err := bufReader.ReadSlice(' ')
for err == bufio.ErrBufferFull {
// This shouldn't happen but we'll tolerate it for the sake of peace
_, err = bufReader.ReadSlice(' ')
}
if err == io.EOF {
return branchNames, i, nil
}
if err != nil {
return nil, 0, err
}
branchName, err := bufReader.ReadString('\n')
if err == io.EOF {
// This shouldn't happen... but we'll tolerate it for the sake of peace
return branchNames, i, nil
}
if err != nil {
return nil, i, err
}
branchName = strings.TrimPrefix(branchName, prefix)
if len(branchName) > 0 {
branchName = branchName[:len(branchName)-1]
}
branchNames = append(branchNames, branchName)
i++
}
// count all refs
for limit != 0 {
_, isPrefix, err := bufReader.ReadLine()
if err == io.EOF {
return branchNames, i, nil
}
if err != nil {
return nil, 0, err
}
if !isPrefix {
i++
}
}
return branchNames, i, nil
}
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