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gitea/services/pull/update.go

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// Copyright 2020 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 (
"fmt"
"strconv"
"strings"
"code.gitea.io/gitea/models"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
)
// Update updates pull request with base branch.
func Update(pull *models.PullRequest, doer *models.User, message string) error {
//use merge functions but switch repo's and branch's
pr := &models.PullRequest{
HeadRepoID: pull.BaseRepoID,
BaseRepoID: pull.HeadRepoID,
HeadBranch: pull.BaseBranch,
BaseBranch: pull.HeadBranch,
}
if err := pr.LoadHeadRepo(); err != nil {
log.Error("LoadHeadRepo: %v", err)
return fmt.Errorf("LoadHeadRepo: %v", err)
} else if err = pr.LoadBaseRepo(); err != nil {
log.Error("LoadBaseRepo: %v", err)
return fmt.Errorf("LoadBaseRepo: %v", err)
}
diffCount, err := GetDiverging(pull)
if err != nil {
return err
} else if diffCount.Behind == 0 {
return fmt.Errorf("HeadBranch of PR %d is up to date", pull.Index)
}
defer func() {
go AddTestPullRequestTask(doer, pr.HeadRepo.ID, pr.HeadBranch, false, "", "")
}()
return rawMerge(pr, doer, models.MergeStyleMerge, message)
}
// IsUserAllowedToUpdate check if user is allowed to update PR with given permissions and branch protections
func IsUserAllowedToUpdate(pull *models.PullRequest, user *models.User) (bool, error) {
headRepoPerm, err := models.GetUserRepoPermission(pull.HeadRepo, user)
if err != nil {
return false, err
}
pr := &models.PullRequest{
HeadRepoID: pull.BaseRepoID,
BaseRepoID: pull.HeadRepoID,
HeadBranch: pull.BaseBranch,
BaseBranch: pull.HeadBranch,
}
return IsUserAllowedToMerge(pr, headRepoPerm, user)
}
// GetDiverging determines how many commits a PR is ahead or behind the PR base branch
func GetDiverging(pr *models.PullRequest) (*git.DivergeObject, error) {
log.Trace("PushToBaseRepo[%d]: pushing commits to base repo '%s'", pr.BaseRepoID, pr.GetGitRefName())
if err := pr.LoadBaseRepo(); err != nil {
return nil, err
}
if err := pr.LoadHeadRepo(); err != nil {
return nil, err
}
headRepoPath := pr.HeadRepo.RepoPath()
headGitRepo, err := git.OpenRepository(headRepoPath)
if err != nil {
return nil, fmt.Errorf("OpenRepository: %v", err)
}
defer headGitRepo.Close()
if pr.IsSameRepo() {
diff, err := git.GetDivergingCommits(pr.HeadRepo.RepoPath(), pr.BaseBranch, pr.HeadBranch)
return &diff, err
}
tmpRemoteName := fmt.Sprintf("tmp-pull-%d-base", pr.ID)
if err = headGitRepo.AddRemote(tmpRemoteName, pr.BaseRepo.RepoPath(), true); err != nil {
return nil, fmt.Errorf("headGitRepo.AddRemote: %v", err)
}
// Make sure to remove the remote even if the push fails
defer func() {
if err := headGitRepo.RemoveRemote(tmpRemoteName); err != nil {
log.Error("CountDiverging: RemoveRemote: %s", err)
}
}()
// $(git rev-list --count tmp-pull-1-base/master..feature) commits ahead of master
ahead, errorAhead := checkDivergence(headRepoPath, fmt.Sprintf("%s/%s", tmpRemoteName, pr.BaseBranch), pr.HeadBranch)
if errorAhead != nil {
return &git.DivergeObject{}, errorAhead
}
// $(git rev-list --count feature..tmp-pull-1-base/master) commits behind master
behind, errorBehind := checkDivergence(headRepoPath, pr.HeadBranch, fmt.Sprintf("%s/%s", tmpRemoteName, pr.BaseBranch))
if errorBehind != nil {
return &git.DivergeObject{}, errorBehind
}
return &git.DivergeObject{Ahead: ahead, Behind: behind}, nil
}
func checkDivergence(repoPath string, baseBranch string, targetBranch string) (int, error) {
branches := fmt.Sprintf("%s..%s", baseBranch, targetBranch)
cmd := git.NewCommand("rev-list", "--count", branches)
stdout, err := cmd.RunInDir(repoPath)
if err != nil {
return -1, err
}
outInteger, errInteger := strconv.Atoi(strings.Trim(stdout, "\n"))
if errInteger != nil {
return -1, errInteger
}
return outInteger, nil
}