33f9fb8150
Running git update-index for every individual file is slow, so add and remove everything with a single git command. When such a big commit lands in the default branch, it could cause PR creation and patch checking for all open PRs to be slow, or time out entirely. For example, a commit that removes 1383 files was measured to take more than 60 seconds and timed out. With this change checking took about a second. This is related to #27967, though this will not help with commits that change many lines in few files. (cherry picked from commit b88e5fc72d99e9d4a0aa9c13f70e0a9e967fe057)
582 lines
20 KiB
Go
582 lines
20 KiB
Go
// Copyright 2019 The Gitea Authors.
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// All rights reserved.
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// SPDX-License-Identifier: MIT
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package pull
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"path/filepath"
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"strings"
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"code.gitea.io/gitea/models"
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git_model "code.gitea.io/gitea/models/git"
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issues_model "code.gitea.io/gitea/models/issues"
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"code.gitea.io/gitea/models/unit"
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"code.gitea.io/gitea/modules/container"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/gitrepo"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/process"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/util"
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"github.com/gobwas/glob"
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)
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// DownloadDiffOrPatch will write the patch for the pr to the writer
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func DownloadDiffOrPatch(ctx context.Context, pr *issues_model.PullRequest, w io.Writer, patch, binary bool) error {
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if err := pr.LoadBaseRepo(ctx); err != nil {
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log.Error("Unable to load base repository ID %d for pr #%d [%d]", pr.BaseRepoID, pr.Index, pr.ID)
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return err
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}
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gitRepo, closer, err := gitrepo.RepositoryFromContextOrOpen(ctx, pr.BaseRepo)
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if err != nil {
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return fmt.Errorf("OpenRepository: %w", err)
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}
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defer closer.Close()
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if err := gitRepo.GetDiffOrPatch(pr.MergeBase, pr.GetGitRefName(), w, patch, binary); err != nil {
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log.Error("Unable to get patch file from %s to %s in %s Error: %v", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
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return fmt.Errorf("Unable to get patch file from %s to %s in %s Error: %w", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
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}
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return nil
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}
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var patchErrorSuffices = []string{
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": already exists in index",
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": patch does not apply",
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": already exists in working directory",
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"unrecognized input",
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": No such file or directory",
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": does not exist in index",
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}
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// TestPatch will test whether a simple patch will apply
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func TestPatch(pr *issues_model.PullRequest) error {
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ctx, _, finished := process.GetManager().AddContext(graceful.GetManager().HammerContext(), fmt.Sprintf("TestPatch: %s", pr))
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defer finished()
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prCtx, cancel, err := createTemporaryRepoForPR(ctx, pr)
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if err != nil {
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if !git_model.IsErrBranchNotExist(err) {
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log.Error("CreateTemporaryRepoForPR %-v: %v", pr, err)
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}
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return err
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}
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defer cancel()
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return testPatch(ctx, prCtx, pr)
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}
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func testPatch(ctx context.Context, prCtx *prContext, pr *issues_model.PullRequest) error {
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gitRepo, err := git.OpenRepository(ctx, prCtx.tmpBasePath)
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if err != nil {
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return fmt.Errorf("OpenRepository: %w", err)
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}
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defer gitRepo.Close()
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// 1. update merge base
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pr.MergeBase, _, err = git.NewCommand(ctx, "merge-base", "--", "base", "tracking").RunStdString(&git.RunOpts{Dir: prCtx.tmpBasePath})
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if err != nil {
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var err2 error
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pr.MergeBase, err2 = gitRepo.GetRefCommitID(git.BranchPrefix + "base")
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if err2 != nil {
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return fmt.Errorf("GetMergeBase: %v and can't find commit ID for base: %w", err, err2)
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}
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}
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pr.MergeBase = strings.TrimSpace(pr.MergeBase)
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if pr.HeadCommitID, err = gitRepo.GetRefCommitID(git.BranchPrefix + "tracking"); err != nil {
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return fmt.Errorf("GetBranchCommitID: can't find commit ID for head: %w", err)
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}
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if pr.HeadCommitID == pr.MergeBase {
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pr.Status = issues_model.PullRequestStatusAncestor
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return nil
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}
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// 2. Check for conflicts
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if conflicts, err := checkConflicts(ctx, pr, gitRepo, prCtx.tmpBasePath); err != nil || conflicts || pr.Status == issues_model.PullRequestStatusEmpty {
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return err
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}
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// 3. Check for protected files changes
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if err = checkPullFilesProtection(ctx, pr, gitRepo); err != nil {
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return fmt.Errorf("pr.CheckPullFilesProtection(): %v", err)
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}
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if len(pr.ChangedProtectedFiles) > 0 {
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log.Trace("Found %d protected files changed", len(pr.ChangedProtectedFiles))
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}
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pr.Status = issues_model.PullRequestStatusMergeable
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return nil
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}
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type errMergeConflict struct {
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filename string
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}
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func (e *errMergeConflict) Error() string {
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return fmt.Sprintf("conflict detected at: %s", e.filename)
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}
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func attemptMerge(ctx context.Context, file *unmergedFile, tmpBasePath string, filesToRemove *[]string, filesToAdd *[]git.IndexObjectInfo) error {
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log.Trace("Attempt to merge:\n%v", file)
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switch {
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case file.stage1 != nil && (file.stage2 == nil || file.stage3 == nil):
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// 1. Deleted in one or both:
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//
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// Conflict <==> the stage1 !SameAs to the undeleted one
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if (file.stage2 != nil && !file.stage1.SameAs(file.stage2)) || (file.stage3 != nil && !file.stage1.SameAs(file.stage3)) {
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// Conflict!
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return &errMergeConflict{file.stage1.path}
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}
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// Not a genuine conflict and we can simply remove the file from the index
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*filesToRemove = append(*filesToRemove, file.stage1.path)
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return nil
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case file.stage1 == nil && file.stage2 != nil && (file.stage3 == nil || file.stage2.SameAs(file.stage3)):
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// 2. Added in ours but not in theirs or identical in both
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//
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// Not a genuine conflict just add to the index
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*filesToAdd = append(*filesToAdd, git.IndexObjectInfo{Mode: file.stage2.mode, Object: git.MustIDFromString(file.stage2.sha), Filename: file.stage2.path})
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return nil
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case file.stage1 == nil && file.stage2 != nil && file.stage3 != nil && file.stage2.sha == file.stage3.sha && file.stage2.mode != file.stage3.mode:
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// 3. Added in both with the same sha but the modes are different
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//
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// Conflict! (Not sure that this can actually happen but we should handle)
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return &errMergeConflict{file.stage2.path}
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case file.stage1 == nil && file.stage2 == nil && file.stage3 != nil:
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// 4. Added in theirs but not ours:
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//
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// Not a genuine conflict just add to the index
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*filesToAdd = append(*filesToAdd, git.IndexObjectInfo{Mode: file.stage3.mode, Object: git.MustIDFromString(file.stage3.sha), Filename: file.stage3.path})
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return nil
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case file.stage1 == nil:
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// 5. Created by new in both
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//
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// Conflict!
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return &errMergeConflict{file.stage2.path}
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case file.stage2 != nil && file.stage3 != nil:
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// 5. Modified in both - we should try to merge in the changes but first:
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//
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if file.stage2.mode == "120000" || file.stage3.mode == "120000" {
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// 5a. Conflicting symbolic link change
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return &errMergeConflict{file.stage2.path}
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}
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if file.stage2.mode == "160000" || file.stage3.mode == "160000" {
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// 5b. Conflicting submodule change
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return &errMergeConflict{file.stage2.path}
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}
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if file.stage2.mode != file.stage3.mode {
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// 5c. Conflicting mode change
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return &errMergeConflict{file.stage2.path}
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}
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// Need to get the objects from the object db to attempt to merge
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root, _, err := git.NewCommand(ctx, "unpack-file").AddDynamicArguments(file.stage1.sha).RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if err != nil {
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return fmt.Errorf("unable to get root object: %s at path: %s for merging. Error: %w", file.stage1.sha, file.stage1.path, err)
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}
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root = strings.TrimSpace(root)
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defer func() {
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_ = util.Remove(filepath.Join(tmpBasePath, root))
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}()
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base, _, err := git.NewCommand(ctx, "unpack-file").AddDynamicArguments(file.stage2.sha).RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if err != nil {
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return fmt.Errorf("unable to get base object: %s at path: %s for merging. Error: %w", file.stage2.sha, file.stage2.path, err)
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}
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base = strings.TrimSpace(filepath.Join(tmpBasePath, base))
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defer func() {
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_ = util.Remove(base)
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}()
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head, _, err := git.NewCommand(ctx, "unpack-file").AddDynamicArguments(file.stage3.sha).RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if err != nil {
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return fmt.Errorf("unable to get head object:%s at path: %s for merging. Error: %w", file.stage3.sha, file.stage3.path, err)
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}
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head = strings.TrimSpace(head)
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defer func() {
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_ = util.Remove(filepath.Join(tmpBasePath, head))
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}()
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// now git merge-file annoyingly takes a different order to the merge-tree ...
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_, _, conflictErr := git.NewCommand(ctx, "merge-file").AddDynamicArguments(base, root, head).RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if conflictErr != nil {
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return &errMergeConflict{file.stage2.path}
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}
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// base now contains the merged data
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hash, _, err := git.NewCommand(ctx, "hash-object", "-w", "--path").AddDynamicArguments(file.stage2.path, base).RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if err != nil {
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return err
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}
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hash = strings.TrimSpace(hash)
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*filesToAdd = append(*filesToAdd, git.IndexObjectInfo{Mode: file.stage2.mode, Object: git.MustIDFromString(hash), Filename: file.stage2.path})
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return nil
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default:
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if file.stage1 != nil {
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return &errMergeConflict{file.stage1.path}
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} else if file.stage2 != nil {
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return &errMergeConflict{file.stage2.path}
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} else if file.stage3 != nil {
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return &errMergeConflict{file.stage3.path}
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}
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}
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return nil
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}
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// AttemptThreeWayMerge will attempt to three way merge using git read-tree and then follow the git merge-one-file algorithm to attempt to resolve basic conflicts
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func AttemptThreeWayMerge(ctx context.Context, gitPath string, gitRepo *git.Repository, base, ours, theirs, description string) (bool, []string, error) {
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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// First we use read-tree to do a simple three-way merge
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if _, _, err := git.NewCommand(ctx, "read-tree", "-m").AddDynamicArguments(base, ours, theirs).RunStdString(&git.RunOpts{Dir: gitPath}); err != nil {
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log.Error("Unable to run read-tree -m! Error: %v", err)
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return false, nil, fmt.Errorf("unable to run read-tree -m! Error: %w", err)
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}
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var filesToRemove []string
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var filesToAdd []git.IndexObjectInfo
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// Then we use git ls-files -u to list the unmerged files and collate the triples in unmergedfiles
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unmerged := make(chan *unmergedFile)
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go unmergedFiles(ctx, gitPath, unmerged)
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defer func() {
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cancel()
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for range unmerged {
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// empty the unmerged channel
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}
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}()
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numberOfConflicts := 0
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conflict := false
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conflictedFiles := make([]string, 0, 5)
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for file := range unmerged {
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if file == nil {
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break
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}
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if file.err != nil {
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cancel()
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return false, nil, file.err
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}
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// OK now we have the unmerged file triplet attempt to merge it
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if err := attemptMerge(ctx, file, gitPath, &filesToRemove, &filesToAdd); err != nil {
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if conflictErr, ok := err.(*errMergeConflict); ok {
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log.Trace("Conflict: %s in %s", conflictErr.filename, description)
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conflict = true
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if numberOfConflicts < 10 {
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conflictedFiles = append(conflictedFiles, conflictErr.filename)
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}
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numberOfConflicts++
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continue
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}
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return false, nil, err
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}
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}
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// Add and remove files in one command, as this is slow with many files otherwise
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if err := gitRepo.RemoveFilesFromIndex(filesToRemove...); err != nil {
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return false, nil, err
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}
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if err := gitRepo.AddObjectsToIndex(filesToAdd...); err != nil {
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return false, nil, err
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}
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return conflict, conflictedFiles, nil
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}
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func checkConflicts(ctx context.Context, pr *issues_model.PullRequest, gitRepo *git.Repository, tmpBasePath string) (bool, error) {
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// 1. checkConflicts resets the conflict status - therefore - reset the conflict status
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pr.ConflictedFiles = nil
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// 2. AttemptThreeWayMerge first - this is much quicker than plain patch to base
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description := fmt.Sprintf("PR[%d] %s/%s#%d", pr.ID, pr.BaseRepo.OwnerName, pr.BaseRepo.Name, pr.Index)
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conflict, conflictFiles, err := AttemptThreeWayMerge(ctx,
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tmpBasePath, gitRepo, pr.MergeBase, "base", "tracking", description)
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if err != nil {
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return false, err
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}
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if !conflict {
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// No conflicts detected so we need to check if the patch is empty...
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// a. Write the newly merged tree and check the new tree-hash
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var treeHash string
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treeHash, _, err = git.NewCommand(ctx, "write-tree").RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if err != nil {
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lsfiles, _, _ := git.NewCommand(ctx, "ls-files", "-u").RunStdString(&git.RunOpts{Dir: tmpBasePath})
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return false, fmt.Errorf("unable to write unconflicted tree: %w\n`git ls-files -u`:\n%s", err, lsfiles)
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}
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treeHash = strings.TrimSpace(treeHash)
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baseTree, err := gitRepo.GetTree("base")
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if err != nil {
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return false, err
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}
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// b. compare the new tree-hash with the base tree hash
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if treeHash == baseTree.ID.String() {
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log.Debug("PullRequest[%d]: Patch is empty - ignoring", pr.ID)
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pr.Status = issues_model.PullRequestStatusEmpty
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}
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return false, nil
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}
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// 3. OK the three-way merge method has detected conflicts
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// 3a. Are still testing with GitApply? If not set the conflict status and move on
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if !setting.Repository.PullRequest.TestConflictingPatchesWithGitApply {
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pr.Status = issues_model.PullRequestStatusConflict
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pr.ConflictedFiles = conflictFiles
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log.Trace("Found %d files conflicted: %v", len(pr.ConflictedFiles), pr.ConflictedFiles)
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return true, nil
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}
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// 3b. Create a plain patch from head to base
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tmpPatchFile, err := os.CreateTemp("", "patch")
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if err != nil {
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log.Error("Unable to create temporary patch file! Error: %v", err)
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return false, fmt.Errorf("unable to create temporary patch file! Error: %w", err)
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}
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defer func() {
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_ = util.Remove(tmpPatchFile.Name())
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}()
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if err := gitRepo.GetDiffBinary(pr.MergeBase, "tracking", tmpPatchFile); err != nil {
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tmpPatchFile.Close()
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log.Error("Unable to get patch file from %s to %s in %s Error: %v", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
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return false, fmt.Errorf("unable to get patch file from %s to %s in %s Error: %w", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
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}
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stat, err := tmpPatchFile.Stat()
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if err != nil {
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tmpPatchFile.Close()
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return false, fmt.Errorf("unable to stat patch file: %w", err)
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}
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patchPath := tmpPatchFile.Name()
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tmpPatchFile.Close()
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// 3c. if the size of that patch is 0 - there can be no conflicts!
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if stat.Size() == 0 {
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log.Debug("PullRequest[%d]: Patch is empty - ignoring", pr.ID)
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pr.Status = issues_model.PullRequestStatusEmpty
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return false, nil
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}
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log.Trace("PullRequest[%d].testPatch (patchPath): %s", pr.ID, patchPath)
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// 4. Read the base branch in to the index of the temporary repository
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_, _, err = git.NewCommand(gitRepo.Ctx, "read-tree", "base").RunStdString(&git.RunOpts{Dir: tmpBasePath})
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if err != nil {
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return false, fmt.Errorf("git read-tree %s: %w", pr.BaseBranch, err)
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}
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// 5. Now get the pull request configuration to check if we need to ignore whitespace
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prUnit, err := pr.BaseRepo.GetUnit(ctx, unit.TypePullRequests)
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if err != nil {
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return false, err
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}
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prConfig := prUnit.PullRequestsConfig()
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// 6. Prepare the arguments to apply the patch against the index
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cmdApply := git.NewCommand(gitRepo.Ctx, "apply", "--check", "--cached")
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if prConfig.IgnoreWhitespaceConflicts {
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cmdApply.AddArguments("--ignore-whitespace")
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}
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is3way := false
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if git.CheckGitVersionAtLeast("2.32.0") == nil {
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cmdApply.AddArguments("--3way")
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is3way = true
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}
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cmdApply.AddDynamicArguments(patchPath)
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// 7. Prep the pipe:
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// - Here we could do the equivalent of:
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// `git apply --check --cached patch_file > conflicts`
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// Then iterate through the conflicts. However, that means storing all the conflicts
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// in memory - which is very wasteful.
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// - alternatively we can do the equivalent of:
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// `git apply --check ... | grep ...`
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// meaning we don't store all of the conflicts unnecessarily.
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stderrReader, stderrWriter, err := os.Pipe()
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if err != nil {
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log.Error("Unable to open stderr pipe: %v", err)
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return false, fmt.Errorf("unable to open stderr pipe: %w", err)
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}
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defer func() {
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_ = stderrReader.Close()
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_ = stderrWriter.Close()
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}()
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// 8. Run the check command
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conflict = false
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err = cmdApply.Run(&git.RunOpts{
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Dir: tmpBasePath,
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Stderr: stderrWriter,
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PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
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// Close the writer end of the pipe to begin processing
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_ = stderrWriter.Close()
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defer func() {
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// Close the reader on return to terminate the git command if necessary
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_ = stderrReader.Close()
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}()
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const prefix = "error: patch failed:"
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const errorPrefix = "error: "
|
|
const threewayFailed = "Failed to perform three-way merge..."
|
|
const appliedPatchPrefix = "Applied patch to '"
|
|
const withConflicts = "' with conflicts."
|
|
|
|
conflicts := make(container.Set[string])
|
|
|
|
// Now scan the output from the command
|
|
scanner := bufio.NewScanner(stderrReader)
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
log.Trace("PullRequest[%d].testPatch: stderr: %s", pr.ID, line)
|
|
if strings.HasPrefix(line, prefix) {
|
|
conflict = true
|
|
filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
|
|
conflicts.Add(filepath)
|
|
} else if is3way && line == threewayFailed {
|
|
conflict = true
|
|
} else if strings.HasPrefix(line, errorPrefix) {
|
|
conflict = true
|
|
for _, suffix := range patchErrorSuffices {
|
|
if strings.HasSuffix(line, suffix) {
|
|
filepath := strings.TrimSpace(strings.TrimSuffix(line[len(errorPrefix):], suffix))
|
|
if filepath != "" {
|
|
conflicts.Add(filepath)
|
|
}
|
|
break
|
|
}
|
|
}
|
|
} else if is3way && strings.HasPrefix(line, appliedPatchPrefix) && strings.HasSuffix(line, withConflicts) {
|
|
conflict = true
|
|
filepath := strings.TrimPrefix(strings.TrimSuffix(line, withConflicts), appliedPatchPrefix)
|
|
if filepath != "" {
|
|
conflicts.Add(filepath)
|
|
}
|
|
}
|
|
// only list 10 conflicted files
|
|
if len(conflicts) >= 10 {
|
|
break
|
|
}
|
|
}
|
|
|
|
if len(conflicts) > 0 {
|
|
pr.ConflictedFiles = make([]string, 0, len(conflicts))
|
|
for key := range conflicts {
|
|
pr.ConflictedFiles = append(pr.ConflictedFiles, key)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
},
|
|
})
|
|
|
|
// 9. Check if the found conflictedfiles is non-zero, "err" could be non-nil, so we should ignore it if we found conflicts.
|
|
// Note: `"err" could be non-nil` is due that if enable 3-way merge, it doesn't return any error on found conflicts.
|
|
if len(pr.ConflictedFiles) > 0 {
|
|
if conflict {
|
|
pr.Status = issues_model.PullRequestStatusConflict
|
|
log.Trace("Found %d files conflicted: %v", len(pr.ConflictedFiles), pr.ConflictedFiles)
|
|
|
|
return true, nil
|
|
}
|
|
} else if err != nil {
|
|
return false, fmt.Errorf("git apply --check: %w", err)
|
|
}
|
|
return false, nil
|
|
}
|
|
|
|
// CheckFileProtection check file Protection
|
|
func CheckFileProtection(repo *git.Repository, oldCommitID, newCommitID string, patterns []glob.Glob, limit int, env []string) ([]string, error) {
|
|
if len(patterns) == 0 {
|
|
return nil, nil
|
|
}
|
|
affectedFiles, err := git.GetAffectedFiles(repo, oldCommitID, newCommitID, env)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
changedProtectedFiles := make([]string, 0, limit)
|
|
for _, affectedFile := range affectedFiles {
|
|
lpath := strings.ToLower(affectedFile)
|
|
for _, pat := range patterns {
|
|
if pat.Match(lpath) {
|
|
changedProtectedFiles = append(changedProtectedFiles, lpath)
|
|
break
|
|
}
|
|
}
|
|
if len(changedProtectedFiles) >= limit {
|
|
break
|
|
}
|
|
}
|
|
if len(changedProtectedFiles) > 0 {
|
|
err = models.ErrFilePathProtected{
|
|
Path: changedProtectedFiles[0],
|
|
}
|
|
}
|
|
return changedProtectedFiles, err
|
|
}
|
|
|
|
// CheckUnprotectedFiles check if the commit only touches unprotected files
|
|
func CheckUnprotectedFiles(repo *git.Repository, oldCommitID, newCommitID string, patterns []glob.Glob, env []string) (bool, error) {
|
|
if len(patterns) == 0 {
|
|
return false, nil
|
|
}
|
|
affectedFiles, err := git.GetAffectedFiles(repo, oldCommitID, newCommitID, env)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
for _, affectedFile := range affectedFiles {
|
|
lpath := strings.ToLower(affectedFile)
|
|
unprotected := false
|
|
for _, pat := range patterns {
|
|
if pat.Match(lpath) {
|
|
unprotected = true
|
|
break
|
|
}
|
|
}
|
|
if !unprotected {
|
|
return false, nil
|
|
}
|
|
}
|
|
return true, nil
|
|
}
|
|
|
|
// checkPullFilesProtection check if pr changed protected files and save results
|
|
func checkPullFilesProtection(ctx context.Context, pr *issues_model.PullRequest, gitRepo *git.Repository) error {
|
|
if pr.Status == issues_model.PullRequestStatusEmpty {
|
|
pr.ChangedProtectedFiles = nil
|
|
return nil
|
|
}
|
|
|
|
pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pr.BaseRepoID, pr.BaseBranch)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if pb == nil {
|
|
pr.ChangedProtectedFiles = nil
|
|
return nil
|
|
}
|
|
|
|
pr.ChangedProtectedFiles, err = CheckFileProtection(gitRepo, pr.MergeBase, "tracking", pb.GetProtectedFilePatterns(), 10, os.Environ())
|
|
if err != nil && !models.IsErrFilePathProtected(err) {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|