gitea/modules/pull/merge.go
zeripath 5c3863c319 Restore functionality for early gits (#7775) (#8476)
* Change tests to make it possible to run TestGit with 1.7.2

* Make merge run on 1.7.2

* Fix tracking and staging branch name problem

* Ensure that git 1.7.2 works on tests

* ensure that there is no chance for conflicts

* Fix-up missing merge issues

* Final rm

* Ensure LFS filters run on the tests

* Do not sign commits from temp repo

* Apply suggestions from code review

* Update modules/repofiles/temp_repo.go
2019-10-13 12:40:13 +08:00

350 lines
13 KiB
Go

// Copyright 2019 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.
package pull
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/cache"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
api "code.gitea.io/gitea/modules/structs"
"code.gitea.io/gitea/modules/util"
"github.com/mcuadros/go-version"
)
// Merge merges pull request to base repository.
// FIXME: add repoWorkingPull make sure two merges does not happen at same time.
func Merge(pr *models.PullRequest, doer *models.User, baseGitRepo *git.Repository, mergeStyle models.MergeStyle, message string) (err error) {
if err = pr.GetHeadRepo(); err != nil {
return fmt.Errorf("GetHeadRepo: %v", err)
} else if err = pr.GetBaseRepo(); err != nil {
return fmt.Errorf("GetBaseRepo: %v", err)
}
prUnit, err := pr.BaseRepo.GetUnit(models.UnitTypePullRequests)
if err != nil {
return err
}
prConfig := prUnit.PullRequestsConfig()
if err := pr.CheckUserAllowedToMerge(doer); err != nil {
return fmt.Errorf("CheckUserAllowedToMerge: %v", err)
}
// Check if merge style is correct and allowed
if !prConfig.IsMergeStyleAllowed(mergeStyle) {
return models.ErrInvalidMergeStyle{ID: pr.BaseRepo.ID, Style: mergeStyle}
}
defer func() {
go models.AddTestPullRequestTask(doer, pr.BaseRepo.ID, pr.BaseBranch, false)
}()
// Clone base repo.
tmpBasePath, err := models.CreateTemporaryPath("merge")
if err != nil {
return err
}
defer func() {
if err := models.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("Merge: RemoveTemporaryPath: %s", err)
}
}()
headRepoPath := models.RepoPath(pr.HeadUserName, pr.HeadRepo.Name)
if err := git.InitRepository(tmpBasePath, false); err != nil {
return fmt.Errorf("git init: %v", err)
}
remoteRepoName := "head_repo"
baseBranch := "base"
// Add head repo remote.
addCacheRepo := func(staging, cache string) error {
p := filepath.Join(staging, ".git", "objects", "info", "alternates")
f, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return err
}
defer f.Close()
data := filepath.Join(cache, "objects")
if _, err := fmt.Fprintln(f, data); err != nil {
return err
}
return nil
}
if err := addCacheRepo(tmpBasePath, baseGitRepo.Path); err != nil {
return fmt.Errorf("addCacheRepo [%s -> %s]: %v", headRepoPath, tmpBasePath, err)
}
var errbuf strings.Builder
if err := git.NewCommand("remote", "add", "-t", pr.BaseBranch, "-m", pr.BaseBranch, "origin", baseGitRepo.Path).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git remote add [%s -> %s]: %s", baseGitRepo.Path, tmpBasePath, errbuf.String())
}
if err := git.NewCommand("fetch", "origin", "--no-tags", pr.BaseBranch+":"+baseBranch, pr.BaseBranch+":original_"+baseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git fetch [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
if err := git.NewCommand("symbolic-ref", "HEAD", git.BranchPrefix+baseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git symbolic-ref HEAD base [%s]: %s", tmpBasePath, errbuf.String())
}
if err := addCacheRepo(tmpBasePath, headRepoPath); err != nil {
return fmt.Errorf("addCacheRepo [%s -> %s]: %v", headRepoPath, tmpBasePath, err)
}
if err := git.NewCommand("remote", "add", remoteRepoName, headRepoPath).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git remote add [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
trackingBranch := "tracking"
// Fetch head branch
if err := git.NewCommand("fetch", "--no-tags", remoteRepoName, pr.HeadBranch+":"+trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git fetch [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
stagingBranch := "staging"
// Enable sparse-checkout
sparseCheckoutList, err := getDiffTree(tmpBasePath, baseBranch, trackingBranch)
if err != nil {
return fmt.Errorf("getDiffTree: %v", err)
}
infoPath := filepath.Join(tmpBasePath, ".git", "info")
if err := os.MkdirAll(infoPath, 0700); err != nil {
return fmt.Errorf("creating directory failed [%s]: %v", infoPath, err)
}
sparseCheckoutListPath := filepath.Join(infoPath, "sparse-checkout")
if err := ioutil.WriteFile(sparseCheckoutListPath, []byte(sparseCheckoutList), 0600); err != nil {
return fmt.Errorf("Writing sparse-checkout file to %s: %v", sparseCheckoutListPath, err)
}
gitConfigCommand := func() func() *git.Command {
binVersion, err := git.BinVersion()
if err != nil {
log.Fatal("Error retrieving git version: %v", err)
}
if version.Compare(binVersion, "1.8.0", ">=") {
return func() *git.Command {
return git.NewCommand("config", "--local")
}
}
return func() *git.Command {
return git.NewCommand("config")
}
}()
// Switch off LFS process (set required, clean and smudge here also)
if err := gitConfigCommand().AddArguments("filter.lfs.process", "").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git config [filter.lfs.process -> <> ]: %v", errbuf.String())
}
if err := gitConfigCommand().AddArguments("filter.lfs.required", "false").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git config [filter.lfs.required -> <false> ]: %v", errbuf.String())
}
if err := gitConfigCommand().AddArguments("filter.lfs.clean", "").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git config [filter.lfs.clean -> <> ]: %v", errbuf.String())
}
if err := gitConfigCommand().AddArguments("filter.lfs.smudge", "").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git config [filter.lfs.smudge -> <> ]: %v", errbuf.String())
}
if err := gitConfigCommand().AddArguments("core.sparseCheckout", "true").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git config [core.sparsecheckout -> true]: %v", errbuf.String())
}
// Read base branch index
if err := git.NewCommand("read-tree", "HEAD").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git read-tree HEAD: %s", errbuf.String())
}
// Merge commits.
switch mergeStyle {
case models.MergeStyleMerge:
if err := git.NewCommand("merge", "--no-ff", "--no-commit", trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git merge --no-ff --no-commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
}
sig := doer.NewGitSig()
if err := git.NewCommand("commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
}
case models.MergeStyleRebase:
// Checkout head branch
if err := git.NewCommand("checkout", "-b", stagingBranch, trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git checkout: %s", errbuf.String())
}
// Rebase before merging
if err := git.NewCommand("rebase", "-q", baseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git rebase [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
// Checkout base branch again
if err := git.NewCommand("checkout", baseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git checkout: %s", errbuf.String())
}
// Merge fast forward
if err := git.NewCommand("merge", "--ff-only", "-q", stagingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git merge --ff-only [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
case models.MergeStyleRebaseMerge:
// Checkout head branch
if err := git.NewCommand("checkout", "-b", stagingBranch, trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git checkout: %s", errbuf.String())
}
// Rebase before merging
if err := git.NewCommand("rebase", "-q", baseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git rebase [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
// Checkout base branch again
if err := git.NewCommand("checkout", baseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git checkout: %s", errbuf.String())
}
// Prepare merge with commit
if err := git.NewCommand("merge", "--no-ff", "--no-commit", "-q", stagingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git merge --no-ff [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
// Set custom message and author and create merge commit
sig := doer.NewGitSig()
if err := git.NewCommand("commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
}
case models.MergeStyleSquash:
// Merge with squash
if err := git.NewCommand("merge", "-q", "--squash", trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git merge --squash [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
}
sig := pr.Issue.Poster.NewGitSig()
if err := git.NewCommand("commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
}
default:
return models.ErrInvalidMergeStyle{ID: pr.BaseRepo.ID, Style: mergeStyle}
}
// OK we should cache our current head and origin/headbranch
mergeHeadSHA, err := git.GetFullCommitID(tmpBasePath, "HEAD")
if err != nil {
return fmt.Errorf("Failed to get full commit id for HEAD: %v", err)
}
mergeBaseSHA, err := git.GetFullCommitID(tmpBasePath, "original_"+baseBranch)
if err != nil {
return fmt.Errorf("Failed to get full commit id for origin/%s: %v", pr.BaseBranch, err)
}
// Now it's questionable about where this should go - either after or before the push
// I think in the interests of data safety - failures to push to the lfs should prevent
// the merge as you can always remerge.
if setting.LFS.StartServer {
if err := LFSPush(tmpBasePath, mergeHeadSHA, mergeBaseSHA, pr); err != nil {
return err
}
}
headUser, err := models.GetUserByName(pr.HeadUserName)
if err != nil {
if !models.IsErrUserNotExist(err) {
log.Error("Can't find user: %s for head repository - %v", pr.HeadUserName, err)
return err
}
log.Error("Can't find user: %s for head repository - defaulting to doer: %s - %v", pr.HeadUserName, doer.Name, err)
headUser = doer
}
env := models.FullPushingEnvironment(
headUser,
doer,
pr.BaseRepo,
pr.BaseRepo.Name,
pr.ID,
)
// Push back to upstream.
if err := git.NewCommand("push", "origin", baseBranch+":"+pr.BaseBranch).RunInDirTimeoutEnvPipeline(env, -1, tmpBasePath, nil, &errbuf); err != nil {
return fmt.Errorf("git push: %s", errbuf.String())
}
pr.MergedCommitID, err = baseGitRepo.GetBranchCommitID(pr.BaseBranch)
if err != nil {
return fmt.Errorf("GetBranchCommit: %v", err)
}
pr.MergedUnix = util.TimeStampNow()
pr.Merger = doer
pr.MergerID = doer.ID
if err = pr.SetMerged(); err != nil {
log.Error("setMerged [%d]: %v", pr.ID, err)
}
if err = models.MergePullRequestAction(doer, pr.Issue.Repo, pr.Issue); err != nil {
log.Error("MergePullRequestAction [%d]: %v", pr.ID, err)
}
// Reset cached commit count
cache.Remove(pr.Issue.Repo.GetCommitsCountCacheKey(pr.BaseBranch, true))
// Reload pull request information.
if err = pr.LoadAttributes(); err != nil {
log.Error("LoadAttributes: %v", err)
return nil
}
mode, _ := models.AccessLevel(doer, pr.Issue.Repo)
if err = models.PrepareWebhooks(pr.Issue.Repo, models.HookEventPullRequest, &api.PullRequestPayload{
Action: api.HookIssueClosed,
Index: pr.Index,
PullRequest: pr.APIFormat(),
Repository: pr.Issue.Repo.APIFormat(mode),
Sender: doer.APIFormat(),
}); err != nil {
log.Error("PrepareWebhooks: %v", err)
} else {
go models.HookQueue.Add(pr.Issue.Repo.ID)
}
return nil
}
func getDiffTree(repoPath, baseBranch, headBranch string) (string, error) {
getDiffTreeFromBranch := func(repoPath, baseBranch, headBranch string) (string, error) {
var outbuf, errbuf strings.Builder
// Compute the diff-tree for sparse-checkout
if err := git.NewCommand("diff-tree", "--no-commit-id", "--name-only", "-r", "--root", baseBranch, headBranch, "--").RunInDirPipeline(repoPath, &outbuf, &errbuf); err != nil {
return "", fmt.Errorf("git diff-tree [%s base:%s head:%s]: %s", repoPath, baseBranch, headBranch, errbuf.String())
}
return outbuf.String(), nil
}
list, err := getDiffTreeFromBranch(repoPath, baseBranch, headBranch)
if err != nil {
return "", err
}
// Prefixing '/' for each entry, otherwise all files with the same name in subdirectories would be matched.
out := bytes.Buffer{}
scanner := bufio.NewScanner(strings.NewReader(list))
for scanner.Scan() {
fmt.Fprintf(&out, "/%s\n", scanner.Text())
}
return out.String(), nil
}