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// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package repository
import (
"errors"
"fmt"
issue_model "code.gitea.io/gitea/models/issues"
repo_model "code.gitea.io/gitea/models/repo"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/git"
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/reqctx"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/services/pull"
)
// MergeUpstream merges the base repository's default branch into the fork repository's current branch.
func MergeUpstream(ctx reqctx.RequestContext, doer *user_model.User, repo *repo_model.Repository, branch string) (mergeStyle string, err error) {
if err = repo.MustNotBeArchived(); err != nil {
return "", err
}
if err = repo.GetBaseRepo(ctx); err != nil {
return "", err
}
divergingInfo, err := GetUpstreamDivergingInfo(ctx, repo, branch)
if err != nil {
return "", err
}
if !divergingInfo.BaseBranchHasNewCommits {
return "up-to-date", nil
}
err = git.Push(ctx, repo.BaseRepo.RepoPath(), git.PushOptions{
Remote: repo.RepoPath(),
Branch: fmt.Sprintf("%s:%s", divergingInfo.BaseBranchName, branch),
Env: repo_module.PushingEnvironment(doer, repo),
})
if err == nil {
return "fast-forward", nil
}
if !git.IsErrPushOutOfDate(err) && !git.IsErrPushRejected(err) {
return "", err
}
// TODO: FakePR: it is somewhat hacky, but it is the only way to "merge" at the moment
// ideally in the future the "merge" functions should be refactored to decouple from the PullRequest
fakeIssue := &issue_model.Issue{
ID: -1,
RepoID: repo.ID,
Repo: repo,
Index: -1,
PosterID: doer.ID,
Poster: doer,
IsPull: true,
}
fakePR := &issue_model.PullRequest{
ID: -1,
Status: issue_model.PullRequestStatusMergeable,
IssueID: -1,
Issue: fakeIssue,
Index: -1,
HeadRepoID: repo.ID,
HeadRepo: repo,
BaseRepoID: repo.BaseRepo.ID,
BaseRepo: repo.BaseRepo,
HeadBranch: branch, // maybe HeadCommitID is not needed
BaseBranch: divergingInfo.BaseBranchName,
}
fakeIssue.PullRequest = fakePR
err = pull.Update(ctx, fakePR, doer, "merge upstream", false)
if err != nil {
return "", err
}
return "merge", nil
}
// UpstreamDivergingInfo is also used in templates, so it needs to search for all references before changing it.
type UpstreamDivergingInfo struct {
BaseBranchName string
BaseBranchHasNewCommits bool
HeadBranchCommitsBehind int
}
// GetUpstreamDivergingInfo returns the information about the divergence between the fork repository's branch and the base repository's default branch.
func GetUpstreamDivergingInfo(ctx reqctx.RequestContext, forkRepo *repo_model.Repository, forkBranch string) (*UpstreamDivergingInfo, error) {
if !forkRepo.IsFork {
return nil, util.NewInvalidArgumentErrorf("repo is not a fork")
}
if forkRepo.IsArchived {
return nil, util.NewInvalidArgumentErrorf("repo is archived")
}
if err := forkRepo.GetBaseRepo(ctx); err != nil {
return nil, err
}
// Do the best to follow the GitHub's behavior, suppose there is a `branch-a` in fork repo:
// * if `branch-a` exists in base repo: try to sync `base:branch-a` to `fork:branch-a`
// * if `branch-a` doesn't exist in base repo: try to sync `base:main` to `fork:branch-a`
info, err := GetBranchDivergingInfo(ctx, forkRepo.BaseRepo, forkBranch, forkRepo, forkBranch)
if err == nil {
return &UpstreamDivergingInfo{
BaseBranchName: forkBranch,
BaseBranchHasNewCommits: info.BaseHasNewCommits,
HeadBranchCommitsBehind: info.HeadCommitsBehind,
}, nil
}
if errors.Is(err, util.ErrNotExist) {
info, err = GetBranchDivergingInfo(ctx, forkRepo.BaseRepo, forkRepo.BaseRepo.DefaultBranch, forkRepo, forkBranch)
if err == nil {
return &UpstreamDivergingInfo{
BaseBranchName: forkRepo.BaseRepo.DefaultBranch,
BaseBranchHasNewCommits: info.BaseHasNewCommits,
HeadBranchCommitsBehind: info.HeadCommitsBehind,
}, nil
}
}
return nil, err
}
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