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339 lines
13 KiB
339 lines
13 KiB
// Copyright 2019 The Gitea Authors.
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// All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package pull
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import (
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"bufio"
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"strings"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/cache"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/setting"
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api "code.gitea.io/gitea/modules/structs"
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"code.gitea.io/gitea/modules/util"
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)
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// Merge merges pull request to base repository.
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// FIXME: add repoWorkingPull make sure two merges does not happen at same time.
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func Merge(pr *models.PullRequest, doer *models.User, baseGitRepo *git.Repository, mergeStyle models.MergeStyle, message string) (err error) {
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if err = pr.GetHeadRepo(); err != nil {
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return fmt.Errorf("GetHeadRepo: %v", err)
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} else if err = pr.GetBaseRepo(); err != nil {
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return fmt.Errorf("GetBaseRepo: %v", err)
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}
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prUnit, err := pr.BaseRepo.GetUnit(models.UnitTypePullRequests)
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if err != nil {
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return err
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}
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prConfig := prUnit.PullRequestsConfig()
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if err := pr.CheckUserAllowedToMerge(doer); err != nil {
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return fmt.Errorf("CheckUserAllowedToMerge: %v", err)
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}
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// Check if merge style is correct and allowed
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if !prConfig.IsMergeStyleAllowed(mergeStyle) {
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return models.ErrInvalidMergeStyle{ID: pr.BaseRepo.ID, Style: mergeStyle}
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}
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defer func() {
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go models.HookQueue.Add(pr.BaseRepo.ID)
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go models.AddTestPullRequestTask(doer, pr.BaseRepo.ID, pr.BaseBranch, false)
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}()
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// Clone base repo.
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tmpBasePath, err := models.CreateTemporaryPath("merge")
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if err != nil {
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return err
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}
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defer func() {
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if err := models.RemoveTemporaryPath(tmpBasePath); err != nil {
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log.Error("Merge: RemoveTemporaryPath: %s", err)
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}
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}()
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headRepoPath := models.RepoPath(pr.HeadUserName, pr.HeadRepo.Name)
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if err := git.Clone(baseGitRepo.Path, tmpBasePath, git.CloneRepoOptions{
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Shared: true,
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NoCheckout: true,
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Branch: pr.BaseBranch,
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}); err != nil {
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return fmt.Errorf("git clone: %v", err)
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}
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remoteRepoName := "head_repo"
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// Add head repo remote.
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addCacheRepo := func(staging, cache string) error {
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p := filepath.Join(staging, ".git", "objects", "info", "alternates")
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f, err := os.OpenFile(p, os.O_APPEND|os.O_WRONLY, 0600)
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if err != nil {
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return err
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}
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defer f.Close()
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data := filepath.Join(cache, "objects")
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if _, err := fmt.Fprintln(f, data); err != nil {
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return err
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}
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return nil
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}
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if err := addCacheRepo(tmpBasePath, headRepoPath); err != nil {
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return fmt.Errorf("addCacheRepo [%s -> %s]: %v", headRepoPath, tmpBasePath, err)
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}
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var errbuf strings.Builder
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if err := git.NewCommand("remote", "add", remoteRepoName, headRepoPath).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git remote add [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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// Fetch head branch
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if err := git.NewCommand("fetch", remoteRepoName).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git fetch [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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trackingBranch := path.Join(remoteRepoName, pr.HeadBranch)
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stagingBranch := fmt.Sprintf("%s_%s", remoteRepoName, pr.HeadBranch)
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// Enable sparse-checkout
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sparseCheckoutList, err := getDiffTree(tmpBasePath, pr.BaseBranch, trackingBranch)
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if err != nil {
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return fmt.Errorf("getDiffTree: %v", err)
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}
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infoPath := filepath.Join(tmpBasePath, ".git", "info")
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if err := os.MkdirAll(infoPath, 0700); err != nil {
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return fmt.Errorf("creating directory failed [%s]: %v", infoPath, err)
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}
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sparseCheckoutListPath := filepath.Join(infoPath, "sparse-checkout")
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if err := ioutil.WriteFile(sparseCheckoutListPath, []byte(sparseCheckoutList), 0600); err != nil {
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return fmt.Errorf("Writing sparse-checkout file to %s: %v", sparseCheckoutListPath, err)
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}
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// Switch off LFS process (set required, clean and smudge here also)
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if err := git.NewCommand("config", "--local", "filter.lfs.process", "").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git config [filter.lfs.process -> <> ]: %v", errbuf.String())
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}
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if err := git.NewCommand("config", "--local", "filter.lfs.required", "false").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git config [filter.lfs.required -> <false> ]: %v", errbuf.String())
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}
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if err := git.NewCommand("config", "--local", "filter.lfs.clean", "").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git config [filter.lfs.clean -> <> ]: %v", errbuf.String())
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}
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if err := git.NewCommand("config", "--local", "filter.lfs.smudge", "").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git config [filter.lfs.smudge -> <> ]: %v", errbuf.String())
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}
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if err := git.NewCommand("config", "--local", "core.sparseCheckout", "true").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git config [core.sparsecheckout -> true]: %v", errbuf.String())
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}
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// Read base branch index
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if err := git.NewCommand("read-tree", "HEAD").RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git read-tree HEAD: %s", errbuf.String())
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}
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// Merge commits.
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switch mergeStyle {
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case models.MergeStyleMerge:
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if err := git.NewCommand("merge", "--no-ff", "--no-commit", trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git merge --no-ff --no-commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
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}
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sig := doer.NewGitSig()
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if err := git.NewCommand("commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
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}
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case models.MergeStyleRebase:
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// Checkout head branch
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if err := git.NewCommand("checkout", "-b", stagingBranch, trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git checkout: %s", errbuf.String())
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}
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// Rebase before merging
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if err := git.NewCommand("rebase", "-q", pr.BaseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git rebase [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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// Checkout base branch again
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if err := git.NewCommand("checkout", pr.BaseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git checkout: %s", errbuf.String())
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}
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// Merge fast forward
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if err := git.NewCommand("merge", "--ff-only", "-q", stagingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git merge --ff-only [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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case models.MergeStyleRebaseMerge:
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// Checkout head branch
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if err := git.NewCommand("checkout", "-b", stagingBranch, trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git checkout: %s", errbuf.String())
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}
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// Rebase before merging
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if err := git.NewCommand("rebase", "-q", pr.BaseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git rebase [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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// Checkout base branch again
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if err := git.NewCommand("checkout", pr.BaseBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git checkout: %s", errbuf.String())
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}
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// Prepare merge with commit
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if err := git.NewCommand("merge", "--no-ff", "--no-commit", "-q", stagingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git merge --no-ff [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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// Set custom message and author and create merge commit
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sig := doer.NewGitSig()
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if err := git.NewCommand("commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
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}
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case models.MergeStyleSquash:
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// Merge with squash
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if err := git.NewCommand("merge", "-q", "--squash", trackingBranch).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git merge --squash [%s -> %s]: %s", headRepoPath, tmpBasePath, errbuf.String())
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}
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sig := pr.Issue.Poster.NewGitSig()
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if err := git.NewCommand("commit", fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email), "-m", message).RunInDirPipeline(tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git commit [%s]: %v - %s", tmpBasePath, err, errbuf.String())
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}
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default:
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return models.ErrInvalidMergeStyle{ID: pr.BaseRepo.ID, Style: mergeStyle}
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}
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// OK we should cache our current head and origin/headbranch
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mergeHeadSHA, err := git.GetFullCommitID(tmpBasePath, "HEAD")
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if err != nil {
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return fmt.Errorf("Failed to get full commit id for HEAD: %v", err)
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}
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mergeBaseSHA, err := git.GetFullCommitID(tmpBasePath, "origin/"+pr.BaseBranch)
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if err != nil {
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return fmt.Errorf("Failed to get full commit id for origin/%s: %v", pr.BaseBranch, err)
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}
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// Now it's questionable about where this should go - either after or before the push
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// I think in the interests of data safety - failures to push to the lfs should prevent
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// the merge as you can always remerge.
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if setting.LFS.StartServer {
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if err := LFSPush(tmpBasePath, mergeHeadSHA, mergeBaseSHA, pr); err != nil {
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return err
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}
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}
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env := models.PushingEnvironment(doer, pr.BaseRepo)
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// Push back to upstream.
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if err := git.NewCommand("push", "origin", pr.BaseBranch).RunInDirTimeoutEnvPipeline(env, -1, tmpBasePath, nil, &errbuf); err != nil {
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return fmt.Errorf("git push: %s", errbuf.String())
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}
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pr.MergedCommitID, err = baseGitRepo.GetBranchCommitID(pr.BaseBranch)
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if err != nil {
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return fmt.Errorf("GetBranchCommit: %v", err)
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}
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pr.MergedUnix = util.TimeStampNow()
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pr.Merger = doer
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pr.MergerID = doer.ID
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if err = pr.SetMerged(); err != nil {
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log.Error("setMerged [%d]: %v", pr.ID, err)
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}
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if err = models.MergePullRequestAction(doer, pr.Issue.Repo, pr.Issue); err != nil {
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log.Error("MergePullRequestAction [%d]: %v", pr.ID, err)
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}
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// Reset cached commit count
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cache.Remove(pr.Issue.Repo.GetCommitsCountCacheKey(pr.BaseBranch, true))
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// Reload pull request information.
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if err = pr.LoadAttributes(); err != nil {
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log.Error("LoadAttributes: %v", err)
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return nil
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}
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mode, _ := models.AccessLevel(doer, pr.Issue.Repo)
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if err = models.PrepareWebhooks(pr.Issue.Repo, models.HookEventPullRequest, &api.PullRequestPayload{
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Action: api.HookIssueClosed,
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Index: pr.Index,
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PullRequest: pr.APIFormat(),
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Repository: pr.Issue.Repo.APIFormat(mode),
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Sender: doer.APIFormat(),
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}); err != nil {
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log.Error("PrepareWebhooks: %v", err)
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} else {
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go models.HookQueue.Add(pr.Issue.Repo.ID)
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}
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l, err := baseGitRepo.CommitsBetweenIDs(pr.MergedCommitID, pr.MergeBase)
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if err != nil {
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log.Error("CommitsBetweenIDs: %v", err)
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return nil
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}
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// It is possible that head branch is not fully sync with base branch for merge commits,
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// so we need to get latest head commit and append merge commit manually
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// to avoid strange diff commits produced.
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mergeCommit, err := baseGitRepo.GetBranchCommit(pr.BaseBranch)
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if err != nil {
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log.Error("GetBranchCommit: %v", err)
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return nil
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}
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if mergeStyle == models.MergeStyleMerge {
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l.PushFront(mergeCommit)
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}
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p := &api.PushPayload{
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Ref: git.BranchPrefix + pr.BaseBranch,
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Before: pr.MergeBase,
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After: mergeCommit.ID.String(),
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CompareURL: setting.AppURL + pr.BaseRepo.ComposeCompareURL(pr.MergeBase, pr.MergedCommitID),
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Commits: models.ListToPushCommits(l).ToAPIPayloadCommits(pr.BaseRepo.HTMLURL()),
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Repo: pr.BaseRepo.APIFormat(mode),
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Pusher: pr.HeadRepo.MustOwner().APIFormat(),
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Sender: doer.APIFormat(),
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}
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if err = models.PrepareWebhooks(pr.BaseRepo, models.HookEventPush, p); err != nil {
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log.Error("PrepareWebhooks: %v", err)
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} else {
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go models.HookQueue.Add(pr.BaseRepo.ID)
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}
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return nil
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}
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func getDiffTree(repoPath, baseBranch, headBranch string) (string, error) {
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getDiffTreeFromBranch := func(repoPath, baseBranch, headBranch string) (string, error) {
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var outbuf, errbuf strings.Builder
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// Compute the diff-tree for sparse-checkout
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// The branch argument must be enclosed with double-quotes ("") in case it contains slashes (e.g "feature/test")
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if err := git.NewCommand("diff-tree", "--no-commit-id", "--name-only", "-r", "--root", baseBranch, headBranch).RunInDirPipeline(repoPath, &outbuf, &errbuf); err != nil {
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return "", fmt.Errorf("git diff-tree [%s base:%s head:%s]: %s", repoPath, baseBranch, headBranch, errbuf.String())
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}
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return outbuf.String(), nil
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}
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list, err := getDiffTreeFromBranch(repoPath, baseBranch, headBranch)
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if err != nil {
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return "", err
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}
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// Prefixing '/' for each entry, otherwise all files with the same name in subdirectories would be matched.
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out := bytes.Buffer{}
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scanner := bufio.NewScanner(strings.NewReader(list))
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for scanner.Scan() {
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fmt.Fprintf(&out, "/%s\n", scanner.Text())
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}
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return out.String(), nil
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}
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