Optimize pulls merging (#4921)
* Optimize pulls merging By utilizing `git clone -s --no-checkout` rather than cloning the whole repo. * Use sparse-checkout to speedup pulls merge * Use bytes.Buffer instead of strings.Builder for backward compatibility * Fix empty diff-tree output for repos with only the initial commit * Fix missing argument for the format string * Rework diff-tree-list generation * Remove logging code * File list for sparse-checkout must be prefix with / Otherwise, they would match all files with the same name under subdirectories. * Update onto the rebased head * Use referecen repo to avoid fetching objects
This commit is contained in:
Mura Li
Lauris BH
parent
7d434376f1
commit
6ad834e236
102
models/pull.go
102
models/pull.go
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@ -5,6 +5,8 @@
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package models
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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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@ -328,6 +330,34 @@ func (pr *PullRequest) CheckUserAllowedToMerge(doer *User) (err error) {
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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 stdout, stderr string
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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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stdout, stderr, err := process.GetManager().ExecDir(-1, repoPath,
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fmt.Sprintf("PullRequest.Merge (git diff-tree): %s", repoPath),
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"git", "diff-tree", "--no-commit-id", "--name-only", "-r", "--root", baseBranch, headBranch)
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if err != nil {
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return "", fmt.Errorf("git diff-tree [%s base:%s head:%s]: %s", repoPath, baseBranch, headBranch, stderr)
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}
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return stdout, 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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// 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 (pr *PullRequest) Merge(doer *User, baseGitRepo *git.Repository, mergeStyle MergeStyle, message string) (err error) {
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@ -371,36 +401,76 @@ func (pr *PullRequest) Merge(doer *User, baseGitRepo *git.Repository, mergeStyle
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var stderr string
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if _, stderr, err = process.GetManager().ExecTimeout(5*time.Minute,
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fmt.Sprintf("PullRequest.Merge (git clone): %s", tmpBasePath),
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"git", "clone", baseGitRepo.Path, tmpBasePath); err != nil {
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"git", "clone", "-s", "--no-checkout", "-b", pr.BaseBranch, baseGitRepo.Path, tmpBasePath); err != nil {
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return fmt.Errorf("git clone: %s", stderr)
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}
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// Check out base branch.
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git checkout): %s", tmpBasePath),
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"git", "checkout", pr.BaseBranch); err != nil {
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return fmt.Errorf("git checkout: %s", stderr)
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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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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git remote add): %s", tmpBasePath),
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"git", "remote", "add", "head_repo", headRepoPath); err != nil {
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"git", "remote", "add", remoteRepoName, headRepoPath); err != nil {
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return fmt.Errorf("git remote add [%s -> %s]: %s", headRepoPath, tmpBasePath, stderr)
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}
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// Merge commits.
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// Fetch head branch
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git fetch): %s", tmpBasePath),
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"git", "fetch", "head_repo"); err != nil {
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"git", "fetch", remoteRepoName); err != nil {
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return fmt.Errorf("git fetch [%s -> %s]: %s", headRepoPath, tmpBasePath, stderr)
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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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sparseCheckoutListPath := filepath.Join(tmpBasePath, ".git", "info", "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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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git config): %s", tmpBasePath),
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"git", "config", "--local", "core.sparseCheckout", "true"); err != nil {
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return fmt.Errorf("git config [core.sparsecheckout -> true]: %v", stderr)
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}
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// Read base branch index
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git read-tree): %s", tmpBasePath),
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"git", "read-tree", "HEAD"); err != nil {
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return fmt.Errorf("git read-tree HEAD: %s", stderr)
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}
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// Merge commits.
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switch mergeStyle {
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case MergeStyleMerge:
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git merge --no-ff --no-commit): %s", tmpBasePath),
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"git", "merge", "--no-ff", "--no-commit", "head_repo/"+pr.HeadBranch); err != nil {
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"git", "merge", "--no-ff", "--no-commit", trackingBranch); err != nil {
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return fmt.Errorf("git merge --no-ff --no-commit [%s]: %v - %s", tmpBasePath, err, stderr)
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}
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@ -415,7 +485,7 @@ func (pr *PullRequest) Merge(doer *User, baseGitRepo *git.Repository, mergeStyle
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// Checkout head branch
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git checkout): %s", tmpBasePath),
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"git", "checkout", "-b", "head_repo_"+pr.HeadBranch, "head_repo/"+pr.HeadBranch); err != nil {
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"git", "checkout", "-b", stagingBranch, trackingBranch); err != nil {
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return fmt.Errorf("git checkout: %s", stderr)
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}
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// Rebase before merging
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@ -433,14 +503,14 @@ func (pr *PullRequest) Merge(doer *User, baseGitRepo *git.Repository, mergeStyle
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// Merge fast forward
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git rebase): %s", tmpBasePath),
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"git", "merge", "--ff-only", "-q", "head_repo_"+pr.HeadBranch); err != nil {
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"git", "merge", "--ff-only", "-q", stagingBranch); err != nil {
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return fmt.Errorf("git merge --ff-only [%s -> %s]: %s", headRepoPath, tmpBasePath, stderr)
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}
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case MergeStyleRebaseMerge:
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// Checkout head branch
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git checkout): %s", tmpBasePath),
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"git", "checkout", "-b", "head_repo_"+pr.HeadBranch, "head_repo/"+pr.HeadBranch); err != nil {
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"git", "checkout", "-b", stagingBranch, trackingBranch); err != nil {
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return fmt.Errorf("git checkout: %s", stderr)
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}
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// Rebase before merging
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@ -458,7 +528,7 @@ func (pr *PullRequest) Merge(doer *User, baseGitRepo *git.Repository, mergeStyle
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// Prepare merge with commit
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git merge): %s", tmpBasePath),
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"git", "merge", "--no-ff", "--no-commit", "-q", "head_repo_"+pr.HeadBranch); err != nil {
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"git", "merge", "--no-ff", "--no-commit", "-q", stagingBranch); err != nil {
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return fmt.Errorf("git merge --no-ff [%s -> %s]: %s", headRepoPath, tmpBasePath, stderr)
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}
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@ -475,7 +545,7 @@ func (pr *PullRequest) Merge(doer *User, baseGitRepo *git.Repository, mergeStyle
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// Merge with squash
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if _, stderr, err = process.GetManager().ExecDir(-1, tmpBasePath,
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fmt.Sprintf("PullRequest.Merge (git squash): %s", tmpBasePath),
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"git", "merge", "-q", "--squash", "head_repo/"+pr.HeadBranch); err != nil {
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"git", "merge", "-q", "--squash", trackingBranch); err != nil {
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return fmt.Errorf("git merge --squash [%s -> %s]: %s", headRepoPath, tmpBasePath, stderr)
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}
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sig := pr.Issue.Poster.NewGitSig()
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