mirror of https://github.com/go-gitea/gitea.git
318 lines
9.6 KiB
Go
318 lines
9.6 KiB
Go
// 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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"context"
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"fmt"
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"io"
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"os"
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"strings"
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"code.gitea.io/gitea/models"
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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/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(pr *models.PullRequest, w io.Writer, patch bool) error {
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if err := pr.LoadBaseRepo(); 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, err := git.OpenRepository(pr.BaseRepo.RepoPath())
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if err != nil {
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return fmt.Errorf("OpenRepository: %v", err)
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}
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defer gitRepo.Close()
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if err := gitRepo.GetDiffOrPatch(pr.MergeBase, pr.GetGitRefName(), w, patch); 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: %v", 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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}
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// TestPatch will test whether a simple patch will apply
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func TestPatch(pr *models.PullRequest) error {
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// Clone base repo.
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tmpBasePath, err := createTemporaryRepo(pr)
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if err != nil {
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log.Error("CreateTemporaryPath: %v", err)
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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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gitRepo, err := git.OpenRepository(tmpBasePath)
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if err != nil {
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return fmt.Errorf("OpenRepository: %v", 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("merge-base", "--", "base", "tracking").RunInDir(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: %v", err, err2)
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}
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}
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pr.MergeBase = strings.TrimSpace(pr.MergeBase)
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// 2. Check for conflicts
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if conflicts, err := checkConflicts(pr, gitRepo, tmpBasePath); err != nil || conflicts || pr.Status == models.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(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 = models.PullRequestStatusMergeable
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return nil
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}
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func checkConflicts(pr *models.PullRequest, gitRepo *git.Repository, tmpBasePath string) (bool, error) {
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// 1. 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: %v", 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.GetDiff(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: %v", 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: %v", err)
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}
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patchPath := tmpPatchFile.Name()
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tmpPatchFile.Close()
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// 1a. 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 = models.PullRequestStatusEmpty
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pr.ConflictedFiles = []string{}
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pr.ChangedProtectedFiles = []string{}
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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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// 2. preset the pr.Status as checking (this is not save at present)
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pr.Status = models.PullRequestStatusChecking
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// 3. Read the base branch in to the index of the temporary repository
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_, err = git.NewCommand("read-tree", "base").RunInDir(tmpBasePath)
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if err != nil {
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return false, fmt.Errorf("git read-tree %s: %v", pr.BaseBranch, err)
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}
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// 4. Now get the pull request configuration to check if we need to ignore whitespace
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prUnit, err := pr.BaseRepo.GetUnit(models.UnitTypePullRequests)
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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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// 5. Prepare the arguments to apply the patch against the index
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args := []string{"apply", "--check", "--cached"}
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if prConfig.IgnoreWhitespaceConflicts {
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args = append(args, "--ignore-whitespace")
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}
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args = append(args, patchPath)
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pr.ConflictedFiles = make([]string, 0, 5)
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// 6. 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: %v", 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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// 7. Run the check command
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conflict := false
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err = git.NewCommand(args...).
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RunInDirTimeoutEnvFullPipelineFunc(
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nil, -1, tmpBasePath,
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nil, stderrWriter, nil,
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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: "
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conflictMap := map[string]bool{}
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// Now scan the output from the command
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scanner := bufio.NewScanner(stderrReader)
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(line, prefix) {
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conflict = true
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filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
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conflictMap[filepath] = true
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} else if strings.HasPrefix(line, errorPrefix) {
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conflict = true
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for _, suffix := range patchErrorSuffices {
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if strings.HasSuffix(line, suffix) {
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filepath := strings.TrimSpace(strings.TrimSuffix(line[len(errorPrefix):], suffix))
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if filepath != "" {
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conflictMap[filepath] = true
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}
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break
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}
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}
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}
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// only list 10 conflicted files
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if len(conflictMap) >= 10 {
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break
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}
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}
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if len(conflictMap) > 0 {
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pr.ConflictedFiles = make([]string, 0, len(conflictMap))
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for key := range conflictMap {
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pr.ConflictedFiles = append(pr.ConflictedFiles, key)
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}
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}
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return nil
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})
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// 8. If there is a conflict the `git apply` command will return a non-zero error code - so there will be a positive error.
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if err != nil {
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if conflict {
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pr.Status = models.PullRequestStatusConflict
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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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return false, fmt.Errorf("git apply --check: %v", err)
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}
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return false, nil
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}
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// CheckFileProtection check file Protection
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func CheckFileProtection(oldCommitID, newCommitID string, patterns []glob.Glob, limit int, env []string, repo *git.Repository) ([]string, error) {
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if len(patterns) == 0 {
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return nil, nil
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}
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affectedFiles, err := git.GetAffectedFiles(oldCommitID, newCommitID, env, repo)
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if err != nil {
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return nil, err
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}
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changedProtectedFiles := make([]string, 0, limit)
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for _, affectedFile := range affectedFiles {
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lpath := strings.ToLower(affectedFile)
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for _, pat := range patterns {
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if pat.Match(lpath) {
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changedProtectedFiles = append(changedProtectedFiles, lpath)
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break
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}
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}
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if len(changedProtectedFiles) >= limit {
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break
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}
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}
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if len(changedProtectedFiles) > 0 {
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err = models.ErrFilePathProtected{
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Path: changedProtectedFiles[0],
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}
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}
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return changedProtectedFiles, err
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}
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// CheckUnprotectedFiles check if the commit only touches unprotected files
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func CheckUnprotectedFiles(oldCommitID, newCommitID string, patterns []glob.Glob, env []string, repo *git.Repository) (bool, error) {
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if len(patterns) == 0 {
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return false, nil
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}
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affectedFiles, err := git.GetAffectedFiles(oldCommitID, newCommitID, env, repo)
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if err != nil {
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return false, err
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}
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for _, affectedFile := range affectedFiles {
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lpath := strings.ToLower(affectedFile)
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unprotected := false
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for _, pat := range patterns {
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if pat.Match(lpath) {
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unprotected = true
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break
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}
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}
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if !unprotected {
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return false, nil
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}
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}
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return true, nil
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}
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// checkPullFilesProtection check if pr changed protected files and save results
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func checkPullFilesProtection(pr *models.PullRequest, gitRepo *git.Repository) error {
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if err := pr.LoadProtectedBranch(); err != nil {
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return err
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}
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if pr.ProtectedBranch == nil {
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pr.ChangedProtectedFiles = nil
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return nil
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}
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var err error
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pr.ChangedProtectedFiles, err = CheckFileProtection(pr.MergeBase, "tracking", pr.ProtectedBranch.GetProtectedFilePatterns(), 10, os.Environ(), gitRepo)
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if err != nil && !models.IsErrFilePathProtected(err) {
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return err
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}
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return nil
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}
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