mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-07-05 05:23:15 +02:00
The fix against the race incorrectly assumes the sha of the commit being
pushed belongs to the base repository. It finds the highest possible
pull request ID from the head repository instead of looking it up in
the base repository.
Figuring out if a PR was created in the future based on the highest
index of the base repository would require collecting all of them
because there is no way to know in advance which repository may be
involved in the race.
Fixing this race can be done either by:
* Introducing a new field in the pull_request table https://codeberg.org/forgejo/forgejo/pulls/2842
which feels more like a hack than a real solution
* Refactoring the logic
which would be a significant undertaking
The race has been in the codebase for a very long time and manifests
itself in the CI, when events happen in quick succession. The only
concrete manifestation was however fixed by https://codeberg.org/forgejo/forgejo/issues/2009
Since this race now only exists in theory and not in practice, let's
revert this bugous commit until a proper solution is implemented.
Fixes: https://codeberg.org/forgejo/forgejo/issues/2817
This reverts commit 036f1eddc5
.
Conflicts:
services/pull/pull.go
549 lines
18 KiB
Go
549 lines
18 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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"context"
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"fmt"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/models/db"
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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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access_model "code.gitea.io/gitea/models/perm/access"
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pull_model "code.gitea.io/gitea/models/pull"
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repo_model "code.gitea.io/gitea/models/repo"
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"code.gitea.io/gitea/models/unit"
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user_model "code.gitea.io/gitea/models/user"
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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/references"
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repo_module "code.gitea.io/gitea/modules/repository"
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"code.gitea.io/gitea/modules/setting"
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"code.gitea.io/gitea/modules/timeutil"
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issue_service "code.gitea.io/gitea/services/issue"
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notify_service "code.gitea.io/gitea/services/notify"
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)
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// getMergeMessage composes the message used when merging a pull request.
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func getMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr *issues_model.PullRequest, mergeStyle repo_model.MergeStyle, extraVars map[string]string) (message, body string, err error) {
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if err := pr.LoadBaseRepo(ctx); err != nil {
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return "", "", err
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}
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if err := pr.LoadHeadRepo(ctx); err != nil {
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return "", "", err
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}
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if err := pr.LoadIssue(ctx); err != nil {
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return "", "", err
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}
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if err := pr.Issue.LoadPoster(ctx); err != nil {
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return "", "", err
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}
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isExternalTracker := pr.BaseRepo.UnitEnabled(ctx, unit.TypeExternalTracker)
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issueReference := "#"
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if isExternalTracker {
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issueReference = "!"
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}
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if mergeStyle != "" {
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commit, err := baseGitRepo.GetBranchCommit(pr.BaseRepo.DefaultBranch)
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if err != nil {
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return "", "", err
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}
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templateFilepathForgejo := fmt.Sprintf(".forgejo/default_merge_message/%s_TEMPLATE.md", strings.ToUpper(string(mergeStyle)))
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templateFilepathGitea := fmt.Sprintf(".gitea/default_merge_message/%s_TEMPLATE.md", strings.ToUpper(string(mergeStyle)))
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templateContent, err := commit.GetFileContent(templateFilepathForgejo, setting.Repository.PullRequest.DefaultMergeMessageSize)
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if _, ok := err.(git.ErrNotExist); ok {
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templateContent, err = commit.GetFileContent(templateFilepathGitea, setting.Repository.PullRequest.DefaultMergeMessageSize)
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}
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if err != nil {
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if !git.IsErrNotExist(err) {
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return "", "", err
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}
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} else {
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vars := map[string]string{
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"BaseRepoOwnerName": pr.BaseRepo.OwnerName,
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"BaseRepoName": pr.BaseRepo.Name,
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"BaseBranch": pr.BaseBranch,
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"HeadRepoOwnerName": "",
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"HeadRepoName": "",
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"HeadBranch": pr.HeadBranch,
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"PullRequestTitle": pr.Issue.Title,
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"PullRequestDescription": pr.Issue.Content,
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"PullRequestPosterName": pr.Issue.Poster.Name,
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"PullRequestIndex": strconv.FormatInt(pr.Index, 10),
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"PullRequestReference": fmt.Sprintf("%s%d", issueReference, pr.Index),
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}
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if pr.HeadRepo != nil {
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vars["HeadRepoOwnerName"] = pr.HeadRepo.OwnerName
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vars["HeadRepoName"] = pr.HeadRepo.Name
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}
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for extraKey, extraValue := range extraVars {
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vars[extraKey] = extraValue
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}
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refs, err := pr.ResolveCrossReferences(ctx)
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if err == nil {
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closeIssueIndexes := make([]string, 0, len(refs))
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closeWord := "close"
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if len(setting.Repository.PullRequest.CloseKeywords) > 0 {
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closeWord = setting.Repository.PullRequest.CloseKeywords[0]
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}
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for _, ref := range refs {
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if ref.RefAction == references.XRefActionCloses {
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if err := ref.LoadIssue(ctx); err != nil {
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return "", "", err
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}
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closeIssueIndexes = append(closeIssueIndexes, fmt.Sprintf("%s %s%d", closeWord, issueReference, ref.Issue.Index))
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}
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}
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if len(closeIssueIndexes) > 0 {
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vars["ClosingIssues"] = strings.Join(closeIssueIndexes, ", ")
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} else {
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vars["ClosingIssues"] = ""
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}
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}
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message, body = expandDefaultMergeMessage(templateContent, vars)
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return message, body, nil
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}
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}
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if mergeStyle == repo_model.MergeStyleRebase {
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// for fast-forward rebase, do not amend the last commit if there is no template
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return "", "", nil
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}
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// Squash merge has a different from other styles.
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if mergeStyle == repo_model.MergeStyleSquash {
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return fmt.Sprintf("%s (%s%d)", pr.Issue.Title, issueReference, pr.Issue.Index), "", nil
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}
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if pr.BaseRepoID == pr.HeadRepoID {
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return fmt.Sprintf("Merge pull request '%s' (%s%d) from %s into %s", pr.Issue.Title, issueReference, pr.Issue.Index, pr.HeadBranch, pr.BaseBranch), "", nil
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}
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if pr.HeadRepo == nil {
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return fmt.Sprintf("Merge pull request '%s' (%s%d) from <deleted>:%s into %s", pr.Issue.Title, issueReference, pr.Issue.Index, pr.HeadBranch, pr.BaseBranch), "", nil
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}
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return fmt.Sprintf("Merge pull request '%s' (%s%d) from %s:%s into %s", pr.Issue.Title, issueReference, pr.Issue.Index, pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseBranch), "", nil
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}
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func expandDefaultMergeMessage(template string, vars map[string]string) (message, body string) {
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message = strings.TrimSpace(template)
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if splits := strings.SplitN(message, "\n", 2); len(splits) == 2 {
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message = splits[0]
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body = strings.TrimSpace(splits[1])
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}
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mapping := func(s string) string { return vars[s] }
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return os.Expand(message, mapping), os.Expand(body, mapping)
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}
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// GetDefaultMergeMessage returns default message used when merging pull request
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func GetDefaultMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr *issues_model.PullRequest, mergeStyle repo_model.MergeStyle) (message, body string, err error) {
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return getMergeMessage(ctx, baseGitRepo, pr, mergeStyle, nil)
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}
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// Merge merges pull request to base repository.
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// Caller should check PR is ready to be merged (review and status checks)
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func Merge(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User, baseGitRepo *git.Repository, mergeStyle repo_model.MergeStyle, expectedHeadCommitID, message string, wasAutoMerged bool) error {
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if err := pr.LoadBaseRepo(ctx); err != nil {
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log.Error("Unable to load base repo: %v", err)
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return fmt.Errorf("unable to load base repo: %w", err)
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} else if err := pr.LoadHeadRepo(ctx); err != nil {
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log.Error("Unable to load head repo: %v", err)
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return fmt.Errorf("unable to load head repo: %w", err)
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}
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pullWorkingPool.CheckIn(fmt.Sprint(pr.ID))
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defer pullWorkingPool.CheckOut(fmt.Sprint(pr.ID))
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// Removing an auto merge pull and ignore if not exist
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// FIXME: is this the correct point to do this? Shouldn't this be after IsMergeStyleAllowed?
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if err := pull_model.DeleteScheduledAutoMerge(ctx, pr.ID); err != nil && !db.IsErrNotExist(err) {
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return err
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}
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prUnit, err := pr.BaseRepo.GetUnit(ctx, unit.TypePullRequests)
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if err != nil {
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log.Error("pr.BaseRepo.GetUnit(unit.TypePullRequests): %v", err)
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return err
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}
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prConfig := prUnit.PullRequestsConfig()
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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 AddTestPullRequestTask(doer, pr.BaseRepo.ID, pr.BaseBranch, false, "", "")
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}()
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pr.MergedCommitID, err = doMergeAndPush(ctx, pr, doer, mergeStyle, expectedHeadCommitID, message)
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if err != nil {
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return err
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}
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pr.MergedUnix = timeutil.TimeStampNow()
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pr.Merger = doer
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pr.MergerID = doer.ID
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if _, err := pr.SetMerged(ctx); err != nil {
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log.Error("SetMerged %-v: %v", pr, err)
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}
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if err := pr.LoadIssue(ctx); err != nil {
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log.Error("LoadIssue %-v: %v", pr, err)
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}
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if err := pr.Issue.LoadRepo(ctx); err != nil {
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log.Error("pr.Issue.LoadRepo %-v: %v", pr, err)
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}
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if err := pr.Issue.Repo.LoadOwner(ctx); err != nil {
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log.Error("LoadOwner for %-v: %v", pr, err)
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}
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if wasAutoMerged {
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notify_service.AutoMergePullRequest(ctx, doer, pr)
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} else {
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notify_service.MergePullRequest(ctx, doer, pr)
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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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// Resolve cross references
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refs, err := pr.ResolveCrossReferences(ctx)
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if err != nil {
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log.Error("ResolveCrossReferences: %v", err)
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return nil
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}
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for _, ref := range refs {
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if err = ref.LoadIssue(ctx); err != nil {
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return err
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}
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if err = ref.Issue.LoadRepo(ctx); err != nil {
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return err
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}
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close := ref.RefAction == references.XRefActionCloses
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if close != ref.Issue.IsClosed {
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if err = issue_service.ChangeStatus(ctx, ref.Issue, doer, pr.MergedCommitID, close); err != nil {
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// Allow ErrDependenciesLeft
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if !issues_model.IsErrDependenciesLeft(err) {
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return err
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}
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}
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}
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}
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return nil
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}
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// doMergeAndPush performs the merge operation without changing any pull information in database and pushes it up to the base repository
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func doMergeAndPush(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User, mergeStyle repo_model.MergeStyle, expectedHeadCommitID, message string) (string, error) {
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// Clone base repo.
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mergeCtx, cancel, err := createTemporaryRepoForMerge(ctx, pr, doer, expectedHeadCommitID)
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if err != nil {
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return "", err
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}
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defer cancel()
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// Merge commits.
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switch mergeStyle {
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case repo_model.MergeStyleMerge:
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if err := doMergeStyleMerge(mergeCtx, message); err != nil {
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return "", err
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}
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case repo_model.MergeStyleRebase, repo_model.MergeStyleRebaseMerge:
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if err := doMergeStyleRebase(mergeCtx, mergeStyle, message); err != nil {
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return "", err
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}
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case repo_model.MergeStyleSquash:
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if err := doMergeStyleSquash(mergeCtx, message); err != nil {
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return "", err
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}
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case repo_model.MergeStyleFastForwardOnly:
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if err := doMergeStyleFastForwardOnly(mergeCtx); err != nil {
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return "", err
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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(ctx, mergeCtx.tmpBasePath, "HEAD")
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if err != nil {
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return "", fmt.Errorf("Failed to get full commit id for HEAD: %w", err)
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}
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mergeBaseSHA, err := git.GetFullCommitID(ctx, mergeCtx.tmpBasePath, "original_"+baseBranch)
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if err != nil {
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return "", fmt.Errorf("Failed to get full commit id for origin/%s: %w", pr.BaseBranch, err)
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}
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mergeCommitID, err := git.GetFullCommitID(ctx, mergeCtx.tmpBasePath, baseBranch)
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if err != nil {
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return "", fmt.Errorf("Failed to get full commit id for the new merge: %w", 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(ctx, mergeCtx.tmpBasePath, mergeHeadSHA, mergeBaseSHA, pr); err != nil {
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return "", err
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}
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}
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var headUser *user_model.User
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err = pr.HeadRepo.LoadOwner(ctx)
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if err != nil {
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if !user_model.IsErrUserNotExist(err) {
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log.Error("Can't find user: %d for head repository in %-v: %v", pr.HeadRepo.OwnerID, pr, err)
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return "", err
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}
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log.Warn("Can't find user: %d for head repository in %-v - defaulting to doer: %s - %v", pr.HeadRepo.OwnerID, pr, doer.Name, err)
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headUser = doer
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} else {
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headUser = pr.HeadRepo.Owner
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}
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mergeCtx.env = repo_module.FullPushingEnvironment(
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headUser,
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doer,
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pr.BaseRepo,
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pr.BaseRepo.Name,
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pr.ID,
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)
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pushCmd := git.NewCommand(ctx, "push", "origin").AddDynamicArguments(baseBranch + ":" + git.BranchPrefix + pr.BaseBranch)
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// Push back to upstream.
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// TODO: this cause an api call to "/api/internal/hook/post-receive/...",
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// that prevents us from doint the whole merge in one db transaction
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if err := pushCmd.Run(mergeCtx.RunOpts()); err != nil {
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if strings.Contains(mergeCtx.errbuf.String(), "non-fast-forward") {
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return "", &git.ErrPushOutOfDate{
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StdOut: mergeCtx.outbuf.String(),
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StdErr: mergeCtx.errbuf.String(),
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Err: err,
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}
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} else if strings.Contains(mergeCtx.errbuf.String(), "! [remote rejected]") {
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err := &git.ErrPushRejected{
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StdOut: mergeCtx.outbuf.String(),
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StdErr: mergeCtx.errbuf.String(),
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Err: err,
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}
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err.GenerateMessage()
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return "", err
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}
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return "", fmt.Errorf("git push: %s", mergeCtx.errbuf.String())
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}
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mergeCtx.outbuf.Reset()
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mergeCtx.errbuf.Reset()
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return mergeCommitID, nil
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}
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func commitAndSignNoAuthor(ctx *mergeContext, message string) error {
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cmdCommit := git.NewCommand(ctx, "commit").AddOptionFormat("--message=%s", message)
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if ctx.signKeyID == "" {
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cmdCommit.AddArguments("--no-gpg-sign")
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} else {
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cmdCommit.AddOptionFormat("-S%s", ctx.signKeyID)
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}
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if err := cmdCommit.Run(ctx.RunOpts()); err != nil {
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log.Error("git commit %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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return fmt.Errorf("git commit %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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}
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return nil
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}
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func runMergeCommand(ctx *mergeContext, mergeStyle repo_model.MergeStyle, cmd *git.Command) error {
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if err := cmd.Run(ctx.RunOpts()); err != nil {
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// Merge will leave a MERGE_HEAD file in the .git folder if there is a conflict
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if _, statErr := os.Stat(filepath.Join(ctx.tmpBasePath, ".git", "MERGE_HEAD")); statErr == nil {
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// We have a merge conflict error
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log.Debug("MergeConflict %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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return models.ErrMergeConflicts{
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Style: mergeStyle,
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StdOut: ctx.outbuf.String(),
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StdErr: ctx.errbuf.String(),
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Err: err,
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}
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} else if strings.Contains(ctx.errbuf.String(), "refusing to merge unrelated histories") {
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log.Debug("MergeUnrelatedHistories %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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return models.ErrMergeUnrelatedHistories{
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Style: mergeStyle,
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StdOut: ctx.outbuf.String(),
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StdErr: ctx.errbuf.String(),
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Err: err,
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}
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} else if mergeStyle == repo_model.MergeStyleFastForwardOnly && strings.Contains(ctx.errbuf.String(), "Not possible to fast-forward, aborting") {
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log.Debug("MergeDivergingFastForwardOnly %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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return models.ErrMergeDivergingFastForwardOnly{
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StdOut: ctx.outbuf.String(),
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StdErr: ctx.errbuf.String(),
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Err: err,
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}
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}
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log.Error("git merge %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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return fmt.Errorf("git merge %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
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}
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ctx.outbuf.Reset()
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ctx.errbuf.Reset()
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return nil
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}
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var escapedSymbols = regexp.MustCompile(`([*[?! \\])`)
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// IsUserAllowedToMerge check if user is allowed to merge PR with given permissions and branch protections
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func IsUserAllowedToMerge(ctx context.Context, pr *issues_model.PullRequest, p access_model.Permission, user *user_model.User) (bool, error) {
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if user == nil {
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return false, nil
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}
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pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pr.BaseRepoID, pr.BaseBranch)
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if err != nil {
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return false, err
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}
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|
|
if (p.CanWrite(unit.TypeCode) && pb == nil) || (pb != nil && git_model.IsUserMergeWhitelisted(ctx, pb, user.ID, p)) {
|
|
return true, nil
|
|
}
|
|
|
|
return false, nil
|
|
}
|
|
|
|
// CheckPullBranchProtections checks whether the PR is ready to be merged (reviews and status checks)
|
|
func CheckPullBranchProtections(ctx context.Context, pr *issues_model.PullRequest, skipProtectedFilesCheck bool) (err error) {
|
|
if err = pr.LoadBaseRepo(ctx); err != nil {
|
|
return fmt.Errorf("LoadBaseRepo: %w", err)
|
|
}
|
|
|
|
pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pr.BaseRepoID, pr.BaseBranch)
|
|
if err != nil {
|
|
return fmt.Errorf("LoadProtectedBranch: %v", err)
|
|
}
|
|
if pb == nil {
|
|
return nil
|
|
}
|
|
|
|
isPass, err := IsPullCommitStatusPass(ctx, pr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !isPass {
|
|
return models.ErrDisallowedToMerge{
|
|
Reason: "Not all required status checks successful",
|
|
}
|
|
}
|
|
|
|
if !issues_model.HasEnoughApprovals(ctx, pb, pr) {
|
|
return models.ErrDisallowedToMerge{
|
|
Reason: "Does not have enough approvals",
|
|
}
|
|
}
|
|
if issues_model.MergeBlockedByRejectedReview(ctx, pb, pr) {
|
|
return models.ErrDisallowedToMerge{
|
|
Reason: "There are requested changes",
|
|
}
|
|
}
|
|
if issues_model.MergeBlockedByOfficialReviewRequests(ctx, pb, pr) {
|
|
return models.ErrDisallowedToMerge{
|
|
Reason: "There are official review requests",
|
|
}
|
|
}
|
|
|
|
if issues_model.MergeBlockedByOutdatedBranch(pb, pr) {
|
|
return models.ErrDisallowedToMerge{
|
|
Reason: "The head branch is behind the base branch",
|
|
}
|
|
}
|
|
|
|
if skipProtectedFilesCheck {
|
|
return nil
|
|
}
|
|
|
|
if pb.MergeBlockedByProtectedFiles(pr.ChangedProtectedFiles) {
|
|
return models.ErrDisallowedToMerge{
|
|
Reason: "Changed protected files",
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// MergedManually mark pr as merged manually
|
|
func MergedManually(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User, baseGitRepo *git.Repository, commitID string) error {
|
|
pullWorkingPool.CheckIn(fmt.Sprint(pr.ID))
|
|
defer pullWorkingPool.CheckOut(fmt.Sprint(pr.ID))
|
|
|
|
if err := db.WithTx(ctx, func(ctx context.Context) error {
|
|
if err := pr.LoadBaseRepo(ctx); err != nil {
|
|
return err
|
|
}
|
|
prUnit, err := pr.BaseRepo.GetUnit(ctx, unit.TypePullRequests)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
prConfig := prUnit.PullRequestsConfig()
|
|
|
|
// Check if merge style is correct and allowed
|
|
if !prConfig.IsMergeStyleAllowed(repo_model.MergeStyleManuallyMerged) {
|
|
return models.ErrInvalidMergeStyle{ID: pr.BaseRepo.ID, Style: repo_model.MergeStyleManuallyMerged}
|
|
}
|
|
|
|
objectFormat := git.ObjectFormatFromName(pr.BaseRepo.ObjectFormatName)
|
|
if len(commitID) != objectFormat.FullLength() {
|
|
return fmt.Errorf("Wrong commit ID")
|
|
}
|
|
|
|
commit, err := baseGitRepo.GetCommit(commitID)
|
|
if err != nil {
|
|
if git.IsErrNotExist(err) {
|
|
return fmt.Errorf("Wrong commit ID")
|
|
}
|
|
return err
|
|
}
|
|
commitID = commit.ID.String()
|
|
|
|
ok, err := baseGitRepo.IsCommitInBranch(commitID, pr.BaseBranch)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !ok {
|
|
return fmt.Errorf("Wrong commit ID")
|
|
}
|
|
|
|
pr.MergedCommitID = commitID
|
|
pr.MergedUnix = timeutil.TimeStamp(commit.Author.When.Unix())
|
|
pr.Status = issues_model.PullRequestStatusManuallyMerged
|
|
pr.Merger = doer
|
|
pr.MergerID = doer.ID
|
|
|
|
var merged bool
|
|
if merged, err = pr.SetMerged(ctx); err != nil {
|
|
return err
|
|
} else if !merged {
|
|
return fmt.Errorf("SetMerged failed")
|
|
}
|
|
return nil
|
|
}); err != nil {
|
|
return err
|
|
}
|
|
|
|
notify_service.MergePullRequest(baseGitRepo.Ctx, doer, pr)
|
|
log.Info("manuallyMerged[%d]: Marked as manually merged into %s/%s by commit id: %s", pr.ID, pr.BaseRepo.Name, pr.BaseBranch, commitID)
|
|
return nil
|
|
}
|