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forgejo/modules/git/repo_branch.go
Gusted a21128a734
[CHORE] Drop go-git support
See https://codeberg.org/forgejo/discussions/issues/164 for the
rationale and discussion of this change.

Everything related to the `go-git` dependency is dropped (Only a single
instance is left in a test file to test for an XSS, it requires crafting
an commit that Git itself refuses to craft). `_gogit` files have
been removed entirely, `go:build: !gogit` is removed, `XXX_nogogit.go` files
either have been renamed or had their code being merged into the
`XXX.go` file.
2024-08-12 19:11:09 +02:00

341 lines
9 KiB
Go

// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"bufio"
"bytes"
"context"
"errors"
"fmt"
"io"
"strings"
"code.gitea.io/gitea/modules/log"
)
// BranchPrefix base dir of the branch information file store on git
const BranchPrefix = "refs/heads/"
// IsReferenceExist returns true if given reference exists in the repository.
func IsReferenceExist(ctx context.Context, repoPath, name string) bool {
_, _, err := NewCommand(ctx, "show-ref", "--verify").AddDashesAndList(name).RunStdString(&RunOpts{Dir: repoPath})
return err == nil
}
// IsBranchExist returns true if given branch exists in the repository.
func IsBranchExist(ctx context.Context, repoPath, name string) bool {
return IsReferenceExist(ctx, repoPath, BranchPrefix+name)
}
// Branch represents a Git branch.
type Branch struct {
Name string
Path string
gitRepo *Repository
}
// GetHEADBranch returns corresponding branch of HEAD.
func (repo *Repository) GetHEADBranch() (*Branch, error) {
if repo == nil {
return nil, fmt.Errorf("nil repo")
}
stdout, _, err := NewCommand(repo.Ctx, "symbolic-ref", "HEAD").RunStdString(&RunOpts{Dir: repo.Path})
if err != nil {
return nil, err
}
stdout = strings.TrimSpace(stdout)
if !strings.HasPrefix(stdout, BranchPrefix) {
return nil, fmt.Errorf("invalid HEAD branch: %v", stdout)
}
return &Branch{
Name: stdout[len(BranchPrefix):],
Path: stdout,
gitRepo: repo,
}, nil
}
func GetDefaultBranch(ctx context.Context, repoPath string) (string, error) {
stdout, _, err := NewCommand(ctx, "symbolic-ref", "HEAD").RunStdString(&RunOpts{Dir: repoPath})
if err != nil {
return "", err
}
stdout = strings.TrimSpace(stdout)
if !strings.HasPrefix(stdout, BranchPrefix) {
return "", errors.New("the HEAD is not a branch: " + stdout)
}
return strings.TrimPrefix(stdout, BranchPrefix), nil
}
// GetBranch returns a branch by it's name
func (repo *Repository) GetBranch(branch string) (*Branch, error) {
if !repo.IsBranchExist(branch) {
return nil, ErrBranchNotExist{branch}
}
return &Branch{
Path: repo.Path,
Name: branch,
gitRepo: repo,
}, nil
}
// GetBranches returns a slice of *git.Branch
func (repo *Repository) GetBranches(skip, limit int) ([]*Branch, int, error) {
brs, countAll, err := repo.GetBranchNames(skip, limit)
if err != nil {
return nil, 0, err
}
branches := make([]*Branch, len(brs))
for i := range brs {
branches[i] = &Branch{
Path: repo.Path,
Name: brs[i],
gitRepo: repo,
}
}
return branches, countAll, nil
}
// DeleteBranchOptions Option(s) for delete branch
type DeleteBranchOptions struct {
Force bool
}
// DeleteBranch delete a branch by name on repository.
func (repo *Repository) DeleteBranch(name string, opts DeleteBranchOptions) error {
cmd := NewCommand(repo.Ctx, "branch")
if opts.Force {
cmd.AddArguments("-D")
} else {
cmd.AddArguments("-d")
}
cmd.AddDashesAndList(name)
_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
return err
}
// CreateBranch create a new branch
func (repo *Repository) CreateBranch(branch, oldbranchOrCommit string) error {
cmd := NewCommand(repo.Ctx, "branch")
cmd.AddDashesAndList(branch, oldbranchOrCommit)
_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
return err
}
// AddRemote adds a new remote to repository.
func (repo *Repository) AddRemote(name, url string, fetch bool) error {
cmd := NewCommand(repo.Ctx, "remote", "add")
if fetch {
cmd.AddArguments("-f")
}
cmd.AddDynamicArguments(name, url)
_, _, err := cmd.RunStdString(&RunOpts{Dir: repo.Path})
return err
}
// RemoveRemote removes a remote from repository.
func (repo *Repository) RemoveRemote(name string) error {
_, _, err := NewCommand(repo.Ctx, "remote", "rm").AddDynamicArguments(name).RunStdString(&RunOpts{Dir: repo.Path})
return err
}
// GetCommit returns the head commit of a branch
func (branch *Branch) GetCommit() (*Commit, error) {
return branch.gitRepo.GetBranchCommit(branch.Name)
}
// RenameBranch rename a branch
func (repo *Repository) RenameBranch(from, to string) error {
_, _, err := NewCommand(repo.Ctx, "branch", "-m").AddDynamicArguments(from, to).RunStdString(&RunOpts{Dir: repo.Path})
return err
}
// 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
}