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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package pull
import (
"context"
"fmt"
"strings"
issues_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"
"code.gitea.io/gitea/modules/log"
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/setting"
)
// updateHeadByRebaseOnToBase handles updating a PR's head branch by rebasing it on the PR current base branch
func updateHeadByRebaseOnToBase(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User) error {
// "Clone" base repo and add the cache headers for the head repo and branch
mergeCtx, cancel, err := createTemporaryRepoForMerge(ctx, pr, doer, "")
if err != nil {
return err
}
defer cancel()
// Determine the old merge-base before the rebase - we use this for LFS push later on
oldMergeBase, _, _ := git.NewCommand(ctx, "merge-base").AddDashesAndList(baseBranch, trackingBranch).RunStdString(&git.RunOpts{Dir: mergeCtx.tmpBasePath})
oldMergeBase = strings.TrimSpace(oldMergeBase)
// Rebase the tracking branch on to the base as the staging branch
if err := rebaseTrackingOnToBase(mergeCtx, repo_model.MergeStyleRebaseUpdate); err != nil {
return err
}
if setting.LFS.StartServer {
// Now we need to ensure that the head repository contains any LFS objects between the new base and the old mergebase
// It's questionable about where this should go - either after or before the push
// I think in the interests of data safety - failures to push to the lfs should prevent
// the push as you can always re-rebase.
if err := LFSPush(ctx, mergeCtx.tmpBasePath, baseBranch, oldMergeBase, &issues_model.PullRequest{
HeadRepoID: pr.BaseRepoID,
BaseRepoID: pr.HeadRepoID,
}); err != nil {
log.Error("Unable to push lfs objects between %s and %s up to head branch in %-v: %v", baseBranch, oldMergeBase, pr, err)
return err
}
}
// Now determine who the pushing author should be
var headUser *user_model.User
if err := pr.HeadRepo.LoadOwner(ctx); err != nil {
if !user_model.IsErrUserNotExist(err) {
log.Error("Can't find user: %d for head repository in %-v - %v", pr.HeadRepo.OwnerID, pr, err)
return err
}
log.Error("Can't find user: %d for head repository in %-v - defaulting to doer: %-v - %v", pr.HeadRepo.OwnerID, pr, doer, err)
headUser = doer
} else {
headUser = pr.HeadRepo.Owner
}
pushCmd := git.NewCommand(ctx, "push", "-f", "head_repo").
AddDynamicArguments(stagingBranch + ":" + git.BranchPrefix + pr.HeadBranch)
// Push back to the head repository.
// TODO: this cause an api call to "/api/internal/hook/post-receive/...",
// that prevents us from doint the whole merge in one db transaction
mergeCtx.outbuf.Reset()
mergeCtx.errbuf.Reset()
if err := pushCmd.Run(&git.RunOpts{
Env: repo_module.FullPushingEnvironment(
headUser,
doer,
pr.HeadRepo,
pr.HeadRepo.Name,
pr.ID,
),
Dir: mergeCtx.tmpBasePath,
Stdout: mergeCtx.outbuf,
Stderr: mergeCtx.errbuf,
}); err != nil {
if strings.Contains(mergeCtx.errbuf.String(), "non-fast-forward") {
return &git.ErrPushOutOfDate{
StdOut: mergeCtx.outbuf.String(),
StdErr: mergeCtx.errbuf.String(),
Err: err,
}
} else if strings.Contains(mergeCtx.errbuf.String(), "! [remote rejected]") {
err := &git.ErrPushRejected{
StdOut: mergeCtx.outbuf.String(),
StdErr: mergeCtx.errbuf.String(),
Err: err,
}
err.GenerateMessage()
return err
}
return fmt.Errorf("git push: %s", mergeCtx.errbuf.String())
}
mergeCtx.outbuf.Reset()
mergeCtx.errbuf.Reset()
return nil
}
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