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// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
//go:build !gogit
package git
import (
"bufio"
"bytes"
"context"
"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(repo.Ctx)
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(repo.Ctx)
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 repo == nil || name == "" {
return false
}
return repo.IsReferenceExist(BranchPrefix + name)
}
// GetBranchNames 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) GetBranchNames(skip, limit int) ([]string, int, error) {
return callShowRef(repo.Ctx, repo.Path, BranchPrefix, TrustedCmdArgs{BranchPrefix, "--sort=-committerdate"}, skip, limit)
}
// WalkReferences walks all the references from the repository
// refType should be empty, ObjectTag or ObjectBranch. All other values are equivalent to empty.
func (repo *Repository) WalkReferences(refType ObjectType, skip, limit int, walkfn func(sha1, refname string) error) (int, error) {
var args TrustedCmdArgs
switch refType {
case ObjectTag:
args = TrustedCmdArgs{TagPrefix, "--sort=-taggerdate"}
case ObjectBranch:
args = TrustedCmdArgs{BranchPrefix, "--sort=-committerdate"}
}
return WalkShowRef(repo.Ctx, repo.Path, args, skip, limit, walkfn)
}
// callShowRef return refs, if limit = 0 it will not limit
func callShowRef(ctx context.Context, repoPath, trimPrefix string, extraArgs TrustedCmdArgs, skip, limit int) (branchNames []string, countAll int, err error) {
countAll, err = WalkShowRef(ctx, repoPath, extraArgs, skip, limit, func(_, branchName string) error {
branchName = strings.TrimPrefix(branchName, trimPrefix)
branchNames = append(branchNames, branchName)
return nil
})
return branchNames, countAll, err
}
func WalkShowRef(ctx context.Context, repoPath string, extraArgs TrustedCmdArgs, skip, limit int, walkfn func(sha1, refname string) error) (countAll int, err error) {
stdoutReader, stdoutWriter := io.Pipe()
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
go func() {
stderrBuilder := &strings.Builder{}
args := TrustedCmdArgs{"for-each-ref", "--format=%(objectname) %(refname)"}
args = append(args, extraArgs...)
err := NewCommand(ctx, args...).Run(&RunOpts{
Dir: repoPath,
Stdout: stdoutWriter,
Stderr: 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 i, nil
}
if err != nil {
return 0, err
}
if !isPrefix {
i++
}
}
for limit == 0 || i < skip+limit {
// The output of show-ref is simply a list:
// <sha> SP <ref> LF
sha, err := bufReader.ReadString(' ')
if err == io.EOF {
return i, nil
}
if err != nil {
return 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 i, nil
}
if err != nil {
return i, err
}
if len(branchName) > 0 {
branchName = branchName[:len(branchName)-1]
}
if len(sha) > 0 {
sha = sha[:len(sha)-1]
}
err = walkfn(sha, branchName)
if err != nil {
return i, err
}
i++
}
// count all refs
for limit != 0 {
_, isPrefix, err := bufReader.ReadLine()
if err == io.EOF {
return i, nil
}
if err != nil {
return 0, err
}
if !isPrefix {
i++
}
}
return i, nil
}
// GetRefsBySha returns all references filtered with prefix that belong to a sha commit hash
func (repo *Repository) GetRefsBySha(sha, prefix string) ([]string, error) {
var revList []string
_, err := WalkShowRef(repo.Ctx, repo.Path, nil, 0, 0, func(walkSha, refname string) error {
if walkSha == sha && strings.HasPrefix(refname, prefix) {
revList = append(revList, refname)
}
return nil
})
return revList, err
}
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