A fork of Gitea (see branch `mj`) adding Majority Judgment Polls 𐄷 over Issues and Merge Requests. https://git.mieuxvoter.fr
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// Copyright 2019 The Gitea Authors.
// All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package pull
import (
"bufio"
"context"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/util"
"github.com/gobwas/glob"
)
// DownloadDiffOrPatch will write the patch for the pr to the writer
func DownloadDiffOrPatch(pr *models.PullRequest, w io.Writer, patch bool) error {
if err := pr.LoadBaseRepo(); err != nil {
log.Error("Unable to load base repository ID %d for pr #%d [%d]", pr.BaseRepoID, pr.Index, pr.ID)
return err
}
gitRepo, err := git.OpenRepository(pr.BaseRepo.RepoPath())
if err != nil {
return fmt.Errorf("OpenRepository: %v", err)
}
defer gitRepo.Close()
if err := gitRepo.GetDiffOrPatch(pr.MergeBase, pr.GetGitRefName(), w, patch); err != nil {
log.Error("Unable to get patch file from %s to %s in %s Error: %v", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
return fmt.Errorf("Unable to get patch file from %s to %s in %s Error: %v", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
}
return nil
}
var patchErrorSuffices = []string{
": already exists in index",
": patch does not apply",
": already exists in working directory",
"unrecognized input",
}
// TestPatch will test whether a simple patch will apply
func TestPatch(pr *models.PullRequest) error {
// Clone base repo.
tmpBasePath, err := createTemporaryRepo(pr)
if err != nil {
log.Error("CreateTemporaryPath: %v", err)
return err
}
defer func() {
if err := models.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("Merge: RemoveTemporaryPath: %s", err)
}
}()
gitRepo, err := git.OpenRepository(tmpBasePath)
if err != nil {
return fmt.Errorf("OpenRepository: %v", err)
}
defer gitRepo.Close()
// 1. update merge base
pr.MergeBase, err = git.NewCommand("merge-base", "--", "base", "tracking").RunInDir(tmpBasePath)
if err != nil {
var err2 error
pr.MergeBase, err2 = gitRepo.GetRefCommitID(git.BranchPrefix + "base")
if err2 != nil {
return fmt.Errorf("GetMergeBase: %v and can't find commit ID for base: %v", err, err2)
}
}
pr.MergeBase = strings.TrimSpace(pr.MergeBase)
// 2. Check for conflicts
if conflicts, err := checkConflicts(pr, gitRepo, tmpBasePath); err != nil || conflicts {
return err
}
// 3. Check for protected files changes
if err = checkPullFilesProtection(pr, gitRepo); err != nil {
return fmt.Errorf("pr.CheckPullFilesProtection(): %v", err)
}
if len(pr.ChangedProtectedFiles) > 0 {
log.Trace("Found %d protected files changed", len(pr.ChangedProtectedFiles))
}
pr.Status = models.PullRequestStatusMergeable
return nil
}
func checkConflicts(pr *models.PullRequest, gitRepo *git.Repository, tmpBasePath string) (bool, error) {
// 1. Create a plain patch from head to base
tmpPatchFile, err := ioutil.TempFile("", "patch")
if err != nil {
log.Error("Unable to create temporary patch file! Error: %v", err)
return false, fmt.Errorf("Unable to create temporary patch file! Error: %v", err)
}
defer func() {
_ = util.Remove(tmpPatchFile.Name())
}()
if err := gitRepo.GetDiff(pr.MergeBase, "tracking", tmpPatchFile); err != nil {
tmpPatchFile.Close()
log.Error("Unable to get patch file from %s to %s in %s Error: %v", pr.MergeBase, pr.HeadBranch, pr.BaseRepo.FullName(), err)
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)
}
stat, err := tmpPatchFile.Stat()
if err != nil {
tmpPatchFile.Close()
return false, fmt.Errorf("Unable to stat patch file: %v", err)
}
patchPath := tmpPatchFile.Name()
tmpPatchFile.Close()
// 1a. if the size of that patch is 0 - there can be no conflicts!
if stat.Size() == 0 {
log.Debug("PullRequest[%d]: Patch is empty - ignoring", pr.ID)
pr.Status = models.PullRequestStatusMergeable
pr.ConflictedFiles = []string{}
return false, nil
}
log.Trace("PullRequest[%d].testPatch (patchPath): %s", pr.ID, patchPath)
// 2. preset the pr.Status as checking (this is not save at present)
pr.Status = models.PullRequestStatusChecking
// 3. Read the base branch in to the index of the temporary repository
_, err = git.NewCommand("read-tree", "base").RunInDir(tmpBasePath)
if err != nil {
return false, fmt.Errorf("git read-tree %s: %v", pr.BaseBranch, err)
}
// 4. Now get the pull request configuration to check if we need to ignore whitespace
prUnit, err := pr.BaseRepo.GetUnit(models.UnitTypePullRequests)
if err != nil {
return false, err
}
prConfig := prUnit.PullRequestsConfig()
// 5. Prepare the arguments to apply the patch against the index
args := []string{"apply", "--check", "--cached"}
if prConfig.IgnoreWhitespaceConflicts {
args = append(args, "--ignore-whitespace")
}
args = append(args, patchPath)
pr.ConflictedFiles = make([]string, 0, 5)
// 6. Prep the pipe:
// - Here we could do the equivalent of:
// `git apply --check --cached patch_file > conflicts`
// Then iterate through the conflicts. However, that means storing all the conflicts
// in memory - which is very wasteful.
// - alternatively we can do the equivalent of:
// `git apply --check ... | grep ...`
// meaning we don't store all of the conflicts unnecessarily.
stderrReader, stderrWriter, err := os.Pipe()
if err != nil {
log.Error("Unable to open stderr pipe: %v", err)
return false, fmt.Errorf("Unable to open stderr pipe: %v", err)
}
defer func() {
_ = stderrReader.Close()
_ = stderrWriter.Close()
}()
// 7. Run the check command
conflict := false
err = git.NewCommand(args...).
RunInDirTimeoutEnvFullPipelineFunc(
nil, -1, tmpBasePath,
nil, stderrWriter, nil,
func(ctx context.Context, cancel context.CancelFunc) error {
// Close the writer end of the pipe to begin processing
_ = stderrWriter.Close()
defer func() {
// Close the reader on return to terminate the git command if necessary
_ = stderrReader.Close()
}()
const prefix = "error: patch failed:"
const errorPrefix = "error: "
conflictMap := map[string]bool{}
// Now scan the output from the command
scanner := bufio.NewScanner(stderrReader)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, prefix) {
conflict = true
filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
conflictMap[filepath] = 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 != "" {
conflictMap[filepath] = true
}
break
}
}
}
// only list 10 conflicted files
if len(conflictMap) >= 10 {
break
}
}
if len(conflictMap) > 0 {
pr.ConflictedFiles = make([]string, 0, len(conflictMap))
for key := range conflictMap {
pr.ConflictedFiles = append(pr.ConflictedFiles, key)
}
}
return nil
})
// 8. If there is a conflict the `git apply` command will return a non-zero error code - so there will be a positive error.
if err != nil {
if conflict {
pr.Status = models.PullRequestStatusConflict
log.Trace("Found %d files conflicted: %v", len(pr.ConflictedFiles), pr.ConflictedFiles)
return true, nil
}
return false, fmt.Errorf("git apply --check: %v", err)
}
return false, nil
}
// CheckFileProtection check file Protection
func CheckFileProtection(oldCommitID, newCommitID string, patterns []glob.Glob, limit int, env []string, repo *git.Repository) ([]string, error) {
// 1. If there are no patterns short-circuit and just return nil
if len(patterns) == 0 {
return nil, nil
}
// 2. Prep the pipe
stdoutReader, stdoutWriter, err := os.Pipe()
if err != nil {
log.Error("Unable to create os.Pipe for %s", repo.Path)
return nil, err
}
defer func() {
_ = stdoutReader.Close()
_ = stdoutWriter.Close()
}()
changedProtectedFiles := make([]string, 0, limit)
// 3. Run `git diff --name-only` to get the names of the changed files
err = git.NewCommand("diff", "--name-only", oldCommitID, newCommitID).
RunInDirTimeoutEnvFullPipelineFunc(env, -1, repo.Path,
stdoutWriter, nil, nil,
func(ctx context.Context, cancel context.CancelFunc) error {
// Close the writer end of the pipe to begin processing
_ = stdoutWriter.Close()
defer func() {
// Close the reader on return to terminate the git command if necessary
_ = stdoutReader.Close()
}()
// Now scan the output from the command
scanner := bufio.NewScanner(stdoutReader)
for scanner.Scan() {
path := strings.TrimSpace(scanner.Text())
if len(path) == 0 {
continue
}
lpath := strings.ToLower(path)
for _, pat := range patterns {
if pat.Match(lpath) {
changedProtectedFiles = append(changedProtectedFiles, path)
break
}
}
if len(changedProtectedFiles) >= limit {
break
}
}
if len(changedProtectedFiles) > 0 {
return models.ErrFilePathProtected{
Path: changedProtectedFiles[0],
}
}
return scanner.Err()
})
// 4. log real errors if there are any...
if err != nil && !models.IsErrFilePathProtected(err) {
log.Error("Unable to check file protection for commits from %s to %s in %s: %v", oldCommitID, newCommitID, repo.Path, err)
}
return changedProtectedFiles, err
}
// checkPullFilesProtection check if pr changed protected files and save results
func checkPullFilesProtection(pr *models.PullRequest, gitRepo *git.Repository) error {
if err := pr.LoadProtectedBranch(); err != nil {
return err
}
if pr.ProtectedBranch == nil {
pr.ChangedProtectedFiles = nil
return nil
}
var err error
pr.ChangedProtectedFiles, err = CheckFileProtection(pr.MergeBase, "tracking", pr.ProtectedBranch.GetProtectedFilePatterns(), 10, os.Environ(), gitRepo)
if err != nil && !models.IsErrFilePathProtected(err) {
return err
}
return nil
}