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5 changes: 4 additions & 1 deletion modules/git/pipeline/revlist.go
Original file line number Diff line number Diff line change
@@ -42,7 +42,10 @@ func RevListObjects(ctx context.Context, revListWriter *io.PipeWriter, wg *sync.
defer revListWriter.Close()
stderr := new(bytes.Buffer)
var errbuf strings.Builder
cmd := git.NewCommand(ctx, "rev-list", "--objects").AddDynamicArguments(headSHA).AddArguments("--not").AddDynamicArguments(baseSHA)
cmd := git.NewCommand(ctx, "rev-list", "--objects").AddDynamicArguments(headSHA)
if baseSHA != "" {
cmd = cmd.AddArguments("--not").AddDynamicArguments(baseSHA)
}
if err := cmd.Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: revListWriter,
2 changes: 1 addition & 1 deletion services/pull/lfs.go
Original file line number Diff line number Diff line change
@@ -116,7 +116,7 @@ func createLFSMetaObjectsFromCatFileBatch(catFileBatchReader *io.PipeReader, wg
}

// Then we need to check that this pointer is in the db
if _, err := git_model.GetLFSMetaObjectByOid(db.DefaultContext, pr.HeadRepo.ID, pointer.Oid); err != nil {
if _, err := git_model.GetLFSMetaObjectByOid(db.DefaultContext, pr.HeadRepoID, pointer.Oid); err != nil {
if err == git_model.ErrLFSObjectNotExist {
log.Warn("During merge of: %d in %-v, there is a pointer to LFS Oid: %s which although present in the LFS store is not associated with the head repo %-v", pr.Index, pr.BaseRepo, pointer.Oid, pr.HeadRepo)
continue
495 changes: 65 additions & 430 deletions services/pull/merge.go

Large diffs are not rendered by default.

25 changes: 25 additions & 0 deletions services/pull/merge_merge.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package pull

import (
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
)

// doMergeStyleMerge merges the tracking into the current HEAD - which is assumed to tbe staging branch (equal to the pr.BaseBranch)
func doMergeStyleMerge(ctx *mergeContext, message string) error {
cmd := git.NewCommand(ctx, "merge", "--no-ff", "--no-commit").AddDynamicArguments(trackingBranch)
if err := runMergeCommand(ctx, repo_model.MergeStyleMerge, cmd); err != nil {
log.Error("%-v Unable to merge tracking into base: %v", ctx.pr, err)
return err
}

if err := commitAndSignNoAuthor(ctx, message); err != nil {
log.Error("%-v Unable to make final commit: %v", ctx.pr, err)
return err
}
return nil
}
297 changes: 297 additions & 0 deletions services/pull/merge_prepare.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,297 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package pull

import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"

"code.gitea.io/gitea/models"
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"
asymkey_service "code.gitea.io/gitea/services/asymkey"
)

type mergeContext struct {
*prContext
doer *user_model.User
sig *git.Signature
committer *git.Signature
signArg git.TrustedCmdArgs
env []string
}

func (ctx *mergeContext) RunOpts() *git.RunOpts {
ctx.outbuf.Reset()
ctx.errbuf.Reset()
return &git.RunOpts{
Env: ctx.env,
Dir: ctx.tmpBasePath,
Stdout: ctx.outbuf,
Stderr: ctx.errbuf,
}
}

func createTemporaryRepoForMerge(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User, expectedHeadCommitID string) (mergeCtx *mergeContext, cancel context.CancelFunc, err error) {
// Clone base repo.
prCtx, cancel, err := createTemporaryRepoForPR(ctx, pr)
if err != nil {
log.Error("createTemporaryRepoForPR: %v", err)
return nil, cancel, err
}

mergeCtx = &mergeContext{
prContext: prCtx,
doer: doer,
}

if expectedHeadCommitID != "" {
trackingCommitID, _, err := git.NewCommand(ctx, "show-ref", "--hash").AddDynamicArguments(git.BranchPrefix + trackingBranch).RunStdString(&git.RunOpts{Dir: mergeCtx.tmpBasePath})
if err != nil {
defer cancel()
log.Error("failed to get sha of head branch in %-v: show-ref[%s] --hash refs/heads/tracking: %v", mergeCtx.pr, mergeCtx.tmpBasePath, err)
return nil, nil, fmt.Errorf("unable to get sha of head branch in %v %w", pr, err)
}
if strings.TrimSpace(trackingCommitID) != expectedHeadCommitID {
defer cancel()
return nil, nil, models.ErrSHADoesNotMatch{
GivenSHA: expectedHeadCommitID,
CurrentSHA: trackingCommitID,
}
}
}

mergeCtx.outbuf.Reset()
mergeCtx.errbuf.Reset()
if err := prepareTemporaryRepoForMerge(mergeCtx); err != nil {
defer cancel()
return nil, nil, err
}

mergeCtx.sig = doer.NewGitSig()
mergeCtx.committer = mergeCtx.sig

// Determine if we should sign
sign, keyID, signer, _ := asymkey_service.SignMerge(ctx, mergeCtx.pr, mergeCtx.doer, mergeCtx.tmpBasePath, "HEAD", trackingBranch)
if sign {
mergeCtx.signArg = git.ToTrustedCmdArgs([]string{"-S" + keyID})
if pr.BaseRepo.GetTrustModel() == repo_model.CommitterTrustModel || pr.BaseRepo.GetTrustModel() == repo_model.CollaboratorCommitterTrustModel {
mergeCtx.committer = signer
}
} else {
mergeCtx.signArg = git.ToTrustedCmdArgs([]string{"--no-gpg-sign"})
}

commitTimeStr := time.Now().Format(time.RFC3339)

// Because this may call hooks we should pass in the environment
mergeCtx.env = append(os.Environ(),
"GIT_AUTHOR_NAME="+mergeCtx.sig.Name,
"GIT_AUTHOR_EMAIL="+mergeCtx.sig.Email,
"GIT_AUTHOR_DATE="+commitTimeStr,
"GIT_COMMITTER_NAME="+mergeCtx.committer.Name,
"GIT_COMMITTER_EMAIL="+mergeCtx.committer.Email,
"GIT_COMMITTER_DATE="+commitTimeStr,
)

return mergeCtx, cancel, nil
}

// prepareTemporaryRepoForMerge takes a repository that has been created using createTemporaryRepo
// it then sets up the sparse-checkout and other things
func prepareTemporaryRepoForMerge(ctx *mergeContext) error {
infoPath := filepath.Join(ctx.tmpBasePath, ".git", "info")
if err := os.MkdirAll(infoPath, 0o700); err != nil {
log.Error("%-v Unable to create .git/info in %s: %v", ctx.pr, ctx.tmpBasePath, err)
return fmt.Errorf("Unable to create .git/info in tmpBasePath: %w", err)
}

// Enable sparse-checkout
// Here we use the .git/info/sparse-checkout file as described in the git documentation
sparseCheckoutListFile, err := os.OpenFile(filepath.Join(infoPath, "sparse-checkout"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o600)
if err != nil {
log.Error("%-v Unable to write .git/info/sparse-checkout file in %s: %v", ctx.pr, ctx.tmpBasePath, err)
return fmt.Errorf("Unable to write .git/info/sparse-checkout file in tmpBasePath: %w", err)
}
defer sparseCheckoutListFile.Close() // we will close it earlier but we need to ensure it is closed if there is an error

if err := getDiffTree(ctx, ctx.tmpBasePath, baseBranch, trackingBranch, sparseCheckoutListFile); err != nil {
log.Error("%-v getDiffTree(%s, %s, %s): %v", ctx.pr, ctx.tmpBasePath, baseBranch, trackingBranch, err)
return fmt.Errorf("getDiffTree: %w", err)
}

if err := sparseCheckoutListFile.Close(); err != nil {
log.Error("%-v Unable to close .git/info/sparse-checkout file in %s: %v", ctx.pr, ctx.tmpBasePath, err)
return fmt.Errorf("Unable to close .git/info/sparse-checkout file in tmpBasePath: %w", err)
}

gitConfigCommand := func() *git.Command {
return git.NewCommand(ctx, "config", "--local")
}

setConfig := func(key, value string) error {
if err := gitConfigCommand().AddArguments(git.ToTrustedCmdArgs([]string{key, value})...).
Run(ctx.RunOpts()); err != nil {
if value == "" {
value = "<>"
}
log.Error("git config [%s -> %s ]: %v\n%s\n%s", key, value, err, ctx.outbuf.String(), ctx.errbuf.String())
return fmt.Errorf("git config [%s -> %s ]: %w\n%s\n%s", key, value, err, ctx.outbuf.String(), ctx.errbuf.String())
}
ctx.outbuf.Reset()
ctx.errbuf.Reset()

return nil
}

// Switch off LFS process (set required, clean and smudge here also)
if err := setConfig("filter.lfs.process", ""); err != nil {
return err
}

if err := setConfig("filter.lfs.required", "false"); err != nil {
return err
}

if err := setConfig("filter.lfs.clean", ""); err != nil {
return err
}

if err := setConfig("filter.lfs.smudge", ""); err != nil {
return err
}

if err := setConfig("core.sparseCheckout", "true"); err != nil {
return err
}

// Read base branch index
if err := git.NewCommand(ctx, "read-tree", "HEAD").
Run(ctx.RunOpts()); err != nil {
log.Error("git read-tree HEAD: %v\n%s\n%s", err, ctx.outbuf.String(), ctx.errbuf.String())
return fmt.Errorf("Unable to read base branch in to the index: %w\n%s\n%s", err, ctx.outbuf.String(), ctx.errbuf.String())
}
ctx.outbuf.Reset()
ctx.errbuf.Reset()

return nil
}

// getDiffTree returns a string containing all the files that were changed between headBranch and baseBranch
// the filenames are escaped so as to fit the format required for .git/info/sparse-checkout
func getDiffTree(ctx context.Context, repoPath, baseBranch, headBranch string, out io.Writer) error {
diffOutReader, diffOutWriter, err := os.Pipe()
if err != nil {
log.Error("Unable to create os.Pipe for %s", repoPath)
return err
}
defer func() {
_ = diffOutReader.Close()
_ = diffOutWriter.Close()
}()

scanNullTerminatedStrings := func(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if i := bytes.IndexByte(data, '\x00'); i >= 0 {
return i + 1, data[0:i], nil
}
if atEOF {
return len(data), data, nil
}
return 0, nil, nil
}

err = git.NewCommand(ctx, "diff-tree", "--no-commit-id", "--name-only", "-r", "-r", "-z", "--root").AddDynamicArguments(baseBranch, headBranch).
Run(&git.RunOpts{
Dir: repoPath,
Stdout: diffOutWriter,
PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
// Close the writer end of the pipe to begin processing
_ = diffOutWriter.Close()
defer func() {
// Close the reader on return to terminate the git command if necessary
_ = diffOutReader.Close()
}()

// Now scan the output from the command
scanner := bufio.NewScanner(diffOutReader)
scanner.Split(scanNullTerminatedStrings)
for scanner.Scan() {
filepath := scanner.Text()
// escape '*', '?', '[', spaces and '!' prefix
filepath = escapedSymbols.ReplaceAllString(filepath, `\$1`)
// no necessary to escape the first '#' symbol because the first symbol is '/'
fmt.Fprintf(out, "/%s\n", filepath)
}
return scanner.Err()
},
})
return err
}

// rebaseTrackingOnToBase checks out the tracking branch as staging and rebases it on to the base branch
// if there is a conflict it will return a models.ErrRebaseConflicts
func rebaseTrackingOnToBase(ctx *mergeContext, mergeStyle repo_model.MergeStyle) error {
// Checkout head branch
if err := git.NewCommand(ctx, "checkout", "-b").AddDynamicArguments(stagingBranch, trackingBranch).
Run(ctx.RunOpts()); err != nil {
return fmt.Errorf("unable to git checkout tracking as staging in temp repo for %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
}
ctx.outbuf.Reset()
ctx.errbuf.Reset()

// Rebase before merging
if err := git.NewCommand(ctx, "rebase").AddDynamicArguments(baseBranch).
Run(ctx.RunOpts()); err != nil {
// Rebase will leave a REBASE_HEAD file in .git if there is a conflict
if _, statErr := os.Stat(filepath.Join(ctx.tmpBasePath, ".git", "REBASE_HEAD")); statErr == nil {
var commitSha string
ok := false
failingCommitPaths := []string{
filepath.Join(ctx.tmpBasePath, ".git", "rebase-apply", "original-commit"), // Git < 2.26
filepath.Join(ctx.tmpBasePath, ".git", "rebase-merge", "stopped-sha"), // Git >= 2.26
}
for _, failingCommitPath := range failingCommitPaths {
if _, statErr := os.Stat(failingCommitPath); statErr == nil {
commitShaBytes, readErr := os.ReadFile(failingCommitPath)
if readErr != nil {
// Abandon this attempt to handle the error
return fmt.Errorf("unable to git rebase staging on to base in temp repo for %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
}
commitSha = strings.TrimSpace(string(commitShaBytes))
ok = true
break
}
}
if !ok {
log.Error("Unable to determine failing commit sha for failing rebase in temp repo for %-v. Cannot cast as models.ErrRebaseConflicts.", ctx.pr)
return fmt.Errorf("unable to git rebase staging on to base in temp repo for %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
}
log.Debug("Conflict when rebasing staging on to base in %-v at %s: %v\n%s\n%s", ctx.pr, commitSha, err, ctx.outbuf.String(), ctx.errbuf.String())
return models.ErrRebaseConflicts{
CommitSHA: commitSha,
Style: mergeStyle,
StdOut: ctx.outbuf.String(),
StdErr: ctx.errbuf.String(),
Err: err,
}
}
return fmt.Errorf("unable to git rebase staging on to base in temp repo for %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
}
ctx.outbuf.Reset()
ctx.errbuf.Reset()
return nil
}
50 changes: 50 additions & 0 deletions services/pull/merge_rebase.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,50 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package pull

import (
"fmt"

repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
)

// doMergeStyleRebase rebaases the tracking branch on the base branch as the current HEAD with or with a merge commit to the original pr branch
func doMergeStyleRebase(ctx *mergeContext, mergeStyle repo_model.MergeStyle, message string) error {
if err := rebaseTrackingOnToBase(ctx, mergeStyle); err != nil {
return err
}

// Checkout base branch again
if err := git.NewCommand(ctx, "checkout").AddDynamicArguments(baseBranch).
Run(ctx.RunOpts()); err != nil {
log.Error("git checkout base prior to merge post staging rebase %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
return fmt.Errorf("git checkout base prior to merge post staging rebase %v: %w\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
}
ctx.outbuf.Reset()
ctx.errbuf.Reset()

cmd := git.NewCommand(ctx, "merge")
if mergeStyle == repo_model.MergeStyleRebase {
cmd.AddArguments("--ff-only")
} else {
cmd.AddArguments("--no-ff", "--no-commit")
}
cmd.AddDynamicArguments(stagingBranch)

// Prepare merge with commit
if err := runMergeCommand(ctx, mergeStyle, cmd); err != nil {
log.Error("Unable to merge staging into base: %v", err)
return err
}
if mergeStyle == repo_model.MergeStyleRebaseMerge {
if err := commitAndSignNoAuthor(ctx, message); err != nil {
log.Error("Unable to make final commit: %v", err)
return err
}
}

return nil
}
53 changes: 53 additions & 0 deletions services/pull/merge_squash.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package pull

import (
"fmt"

repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)

// doMergeStyleSquash squashes the tracking branch on the current HEAD (=base)
func doMergeStyleSquash(ctx *mergeContext, message string) error {
cmd := git.NewCommand(ctx, "merge", "--squash").AddDynamicArguments(trackingBranch)
if err := runMergeCommand(ctx, repo_model.MergeStyleSquash, cmd); err != nil {
log.Error("%-v Unable to merge --squash tracking into base: %v", ctx.pr, err)
return err
}

if err := ctx.pr.Issue.LoadPoster(ctx); err != nil {
log.Error("%-v Issue[%d].LoadPoster: %v", ctx.pr, ctx.pr.Issue.ID, err)
return fmt.Errorf("LoadPoster: %w", err)
}
sig := ctx.pr.Issue.Poster.NewGitSig()
if len(ctx.signArg) == 0 {
if err := git.NewCommand(ctx, "commit").
AddOptionFormat("--author='%s <%s>'", sig.Name, sig.Email).
AddOptionFormat("--message=%s", message).
Run(ctx.RunOpts()); err != nil {
log.Error("git commit %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
return fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", ctx.pr.HeadRepo.FullName(), ctx.pr.HeadBranch, ctx.pr.BaseRepo.FullName(), ctx.pr.BaseBranch, err, ctx.outbuf.String(), ctx.errbuf.String())
}
} else {
if setting.Repository.PullRequest.AddCoCommitterTrailers && ctx.committer.String() != sig.String() {
// add trailer
message += fmt.Sprintf("\nCo-authored-by: %s\nCo-committed-by: %s\n", sig.String(), sig.String())
}
if err := git.NewCommand(ctx, "commit").
AddArguments(ctx.signArg...).
AddOptionFormat("--author='%s <%s>'", sig.Name, sig.Email).
AddOptionFormat("--message=%s", message).
Run(ctx.RunOpts()); err != nil {
log.Error("git commit %-v: %v\n%s\n%s", ctx.pr, err, ctx.outbuf.String(), ctx.errbuf.String())
return fmt.Errorf("git commit [%s:%s -> %s:%s]: %w\n%s\n%s", ctx.pr.HeadRepo.FullName(), ctx.pr.HeadBranch, ctx.pr.BaseRepo.FullName(), ctx.pr.BaseBranch, err, ctx.outbuf.String(), ctx.errbuf.String())
}
}
ctx.outbuf.Reset()
ctx.errbuf.Reset()
return nil
}
17 changes: 6 additions & 11 deletions services/pull/patch.go
Original file line number Diff line number Diff line change
@@ -22,7 +22,6 @@ import (
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/process"
repo_module "code.gitea.io/gitea/modules/repository"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"

@@ -64,25 +63,21 @@ func TestPatch(pr *issues_model.PullRequest) error {
defer finished()

// Clone base repo.
tmpBasePath, err := createTemporaryRepo(ctx, pr)
prCtx, cancel, err := createTemporaryRepoForPR(ctx, pr)
if err != nil {
log.Error("CreateTemporaryPath: %v", err)
log.Error("createTemporaryRepoForPR %-v: %v", pr, err)
return err
}
defer func() {
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("Merge: RemoveTemporaryPath: %s", err)
}
}()
defer cancel()

gitRepo, err := git.OpenRepository(ctx, tmpBasePath)
gitRepo, err := git.OpenRepository(ctx, prCtx.tmpBasePath)
if err != nil {
return fmt.Errorf("OpenRepository: %w", err)
}
defer gitRepo.Close()

// 1. update merge base
pr.MergeBase, _, err = git.NewCommand(ctx, "merge-base", "--", "base", "tracking").RunStdString(&git.RunOpts{Dir: tmpBasePath})
pr.MergeBase, _, err = git.NewCommand(ctx, "merge-base", "--", "base", "tracking").RunStdString(&git.RunOpts{Dir: prCtx.tmpBasePath})
if err != nil {
var err2 error
pr.MergeBase, err2 = gitRepo.GetRefCommitID(git.BranchPrefix + "base")
@@ -101,7 +96,7 @@ func TestPatch(pr *issues_model.PullRequest) error {
}

// 2. Check for conflicts
if conflicts, err := checkConflicts(ctx, pr, gitRepo, tmpBasePath); err != nil || conflicts || pr.Status == issues_model.PullRequestStatusEmpty {
if conflicts, err := checkConflicts(ctx, pr, gitRepo, prCtx.tmpBasePath); err != nil || conflicts || pr.Status == issues_model.PullRequestStatusEmpty {
return err
}

14 changes: 5 additions & 9 deletions services/pull/pull.go
Original file line number Diff line number Diff line change
@@ -349,18 +349,14 @@ func AddTestPullRequestTask(doer *user_model.User, repoID int64, branch string,
// checkIfPRContentChanged checks if diff to target branch has changed by push
// A commit can be considered to leave the PR untouched if the patch/diff with its merge base is unchanged
func checkIfPRContentChanged(ctx context.Context, pr *issues_model.PullRequest, oldCommitID, newCommitID string) (hasChanged bool, err error) {
tmpBasePath, err := createTemporaryRepo(ctx, pr)
prCtx, cancel, err := createTemporaryRepoForPR(ctx, pr)
if err != nil {
log.Error("CreateTemporaryRepo: %v", err)
log.Error("CreateTemporaryRepoForPR %-v: %v", pr, err)
return false, err
}
defer func() {
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("checkIfPRContentChanged: RemoveTemporaryPath: %s", err)
}
}()
defer cancel()

tmpRepo, err := git.OpenRepository(ctx, tmpBasePath)
tmpRepo, err := git.OpenRepository(ctx, prCtx.tmpBasePath)
if err != nil {
return false, fmt.Errorf("OpenRepository: %w", err)
}
@@ -379,7 +375,7 @@ func checkIfPRContentChanged(ctx context.Context, pr *issues_model.PullRequest,
}

if err := cmd.Run(&git.RunOpts{
Dir: tmpBasePath,
Dir: prCtx.tmpBasePath,
Stdout: stdoutWriter,
PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
194 changes: 94 additions & 100 deletions services/pull/temp_repo.go
Original file line number Diff line number Diff line change
@@ -19,49 +19,85 @@ import (
repo_module "code.gitea.io/gitea/modules/repository"
)

// createTemporaryRepo creates a temporary repo with "base" for pr.BaseBranch and "tracking" for pr.HeadBranch
// Temporary repos created here use standard branch names to help simplify
// merging code
const (
baseBranch = "base" // equivalent to pr.BaseBranch
trackingBranch = "tracking" // equivalent to pr.HeadBranch
stagingBranch = "staging" // this is used for a working branch
)

type prContext struct {
context.Context
tmpBasePath string
pr *issues_model.PullRequest
outbuf *strings.Builder // we keep these around to help reduce needless buffer recreation,
errbuf *strings.Builder // any use should be preceded by a Reset and preferably after use
}

func (ctx *prContext) RunOpts() *git.RunOpts {
ctx.outbuf.Reset()
ctx.errbuf.Reset()
return &git.RunOpts{
Dir: ctx.tmpBasePath,
Stdout: ctx.outbuf,
Stderr: ctx.errbuf,
}
}

// createTemporaryRepoForPR creates a temporary repo with "base" for pr.BaseBranch and "tracking" for pr.HeadBranch
// it also create a second base branch called "original_base"
func createTemporaryRepo(ctx context.Context, pr *issues_model.PullRequest) (string, error) {
func createTemporaryRepoForPR(ctx context.Context, pr *issues_model.PullRequest) (prCtx *prContext, cancel context.CancelFunc, err error) {
if err := pr.LoadHeadRepo(ctx); err != nil {
log.Error("LoadHeadRepo: %v", err)
return "", fmt.Errorf("LoadHeadRepo: %w", err)
log.Error("%-v LoadHeadRepo: %v", pr, err)
return nil, nil, fmt.Errorf("%v LoadHeadRepo: %w", pr, err)
} else if pr.HeadRepo == nil {
log.Error("Pr %d HeadRepo %d does not exist", pr.ID, pr.HeadRepoID)
return "", &repo_model.ErrRepoNotExist{
log.Error("%-v HeadRepo %d does not exist", pr, pr.HeadRepoID)
return nil, nil, &repo_model.ErrRepoNotExist{
ID: pr.HeadRepoID,
}
} else if err := pr.LoadBaseRepo(ctx); err != nil {
log.Error("LoadBaseRepo: %v", err)
return "", fmt.Errorf("LoadBaseRepo: %w", err)
log.Error("%-v LoadBaseRepo: %v", pr, err)
return nil, nil, fmt.Errorf("%v LoadBaseRepo: %w", pr, err)
} else if pr.BaseRepo == nil {
log.Error("Pr %d BaseRepo %d does not exist", pr.ID, pr.BaseRepoID)
return "", &repo_model.ErrRepoNotExist{
log.Error("%-v BaseRepo %d does not exist", pr, pr.BaseRepoID)
return nil, nil, &repo_model.ErrRepoNotExist{
ID: pr.BaseRepoID,
}
} else if err := pr.HeadRepo.LoadOwner(ctx); err != nil {
log.Error("HeadRepo.LoadOwner: %v", err)
return "", fmt.Errorf("HeadRepo.LoadOwner: %w", err)
log.Error("%-v HeadRepo.LoadOwner: %v", pr, err)
return nil, nil, fmt.Errorf("%v HeadRepo.LoadOwner: %w", pr, err)
} else if err := pr.BaseRepo.LoadOwner(ctx); err != nil {
log.Error("BaseRepo.LoadOwner: %v", err)
return "", fmt.Errorf("BaseRepo.LoadOwner: %w", err)
log.Error("%-v BaseRepo.LoadOwner: %v", pr, err)
return nil, nil, fmt.Errorf("%v BaseRepo.LoadOwner: %w", pr, err)
}

// Clone base repo.
tmpBasePath, err := repo_module.CreateTemporaryPath("pull")
if err != nil {
log.Error("CreateTemporaryPath: %v", err)
return "", err
log.Error("CreateTemporaryPath[%-v]: %v", pr, err)
return nil, nil, err
}
prCtx = &prContext{
Context: ctx,
tmpBasePath: tmpBasePath,
pr: pr,
outbuf: &strings.Builder{},
errbuf: &strings.Builder{},
}
cancel = func() {
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("Error whilst removing removing temporary repo for %-v: %v", pr, err)
}
}

baseRepoPath := pr.BaseRepo.RepoPath()
headRepoPath := pr.HeadRepo.RepoPath()

if err := git.InitRepository(ctx, tmpBasePath, false); err != nil {
log.Error("git init tmpBasePath: %v", err)
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", err
log.Error("Unable to init tmpBasePath for %-v: %v", pr, err)
cancel()
return nil, nil, err
}

remoteRepoName := "head_repo"
@@ -73,99 +109,63 @@ func createTemporaryRepo(ctx context.Context, pr *issues_model.PullRequest) (str
fetchArgs = append(fetchArgs, "--no-write-commit-graph")
}

// Add head repo remote.
addCacheRepo := func(staging, cache string) error {
p := filepath.Join(staging, ".git", "objects", "info", "alternates")
// addCacheRepo adds git alternatives for the cacheRepoPath in the repoPath
addCacheRepo := func(repoPath, cacheRepoPath string) error {
p := filepath.Join(repoPath, ".git", "objects", "info", "alternates")
f, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
if err != nil {
log.Error("Could not create .git/objects/info/alternates file in %s: %v", staging, err)
log.Error("Could not create .git/objects/info/alternates file in %s: %v", repoPath, err)
return err
}
defer f.Close()
data := filepath.Join(cache, "objects")
data := filepath.Join(cacheRepoPath, "objects")
if _, err := fmt.Fprintln(f, data); err != nil {
log.Error("Could not write to .git/objects/info/alternates file in %s: %v", staging, err)
log.Error("Could not write to .git/objects/info/alternates file in %s: %v", repoPath, err)
return err
}
return nil
}

// Add head repo remote.
if err := addCacheRepo(tmpBasePath, baseRepoPath); err != nil {
log.Error("Unable to add base repository to temporary repo [%s -> %s]: %v", pr.BaseRepo.FullName(), tmpBasePath, err)
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to add base repository to temporary repo [%s -> tmpBasePath]: %w", pr.BaseRepo.FullName(), err)
log.Error("%-v Unable to add base repository to temporary repo [%s -> %s]: %v", pr, pr.BaseRepo.FullName(), tmpBasePath, err)
cancel()
return nil, nil, fmt.Errorf("Unable to add base repository to temporary repo [%s -> tmpBasePath]: %w", pr.BaseRepo.FullName(), err)
}

var outbuf, errbuf strings.Builder
if err := git.NewCommand(ctx, "remote", "add", "-t").AddDynamicArguments(pr.BaseBranch).AddArguments("-m").AddDynamicArguments(pr.BaseBranch).AddDynamicArguments("origin", baseRepoPath).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to add base repository as origin [%s -> %s]: %v\n%s\n%s", pr.BaseRepo.FullName(), tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to add base repository as origin [%s -> tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), err, outbuf.String(), errbuf.String())
Run(prCtx.RunOpts()); err != nil {
log.Error("%-v Unable to add base repository as origin [%s -> %s]: %v\n%s\n%s", pr, pr.BaseRepo.FullName(), tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
cancel()
return nil, nil, fmt.Errorf("Unable to add base repository as origin [%s -> tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), err, prCtx.outbuf.String(), prCtx.errbuf.String())
}
outbuf.Reset()
errbuf.Reset()

if err := git.NewCommand(ctx, "fetch", "origin").AddArguments(fetchArgs...).AddDashesAndList(pr.BaseBranch+":"+baseBranch, pr.BaseBranch+":original_"+baseBranch).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to fetch origin base branch [%s:%s -> base, original_base in %s]: %v:\n%s\n%s", pr.BaseRepo.FullName(), pr.BaseBranch, tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to fetch origin base branch [%s:%s -> base, original_base in tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
Run(prCtx.RunOpts()); err != nil {
log.Error("%-v Unable to fetch origin base branch [%s:%s -> base, original_base in %s]: %v:\n%s\n%s", pr, pr.BaseRepo.FullName(), pr.BaseBranch, tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
cancel()
return nil, nil, fmt.Errorf("Unable to fetch origin base branch [%s:%s -> base, original_base in tmpBasePath]: %w\n%s\n%s", pr.BaseRepo.FullName(), pr.BaseBranch, err, prCtx.outbuf.String(), prCtx.errbuf.String())
}
outbuf.Reset()
errbuf.Reset()

if err := git.NewCommand(ctx, "symbolic-ref").AddDynamicArguments("HEAD", git.BranchPrefix+baseBranch).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to set HEAD as base branch [%s]: %v\n%s\n%s", tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to set HEAD as base branch [tmpBasePath]: %w\n%s\n%s", err, outbuf.String(), errbuf.String())
Run(prCtx.RunOpts()); err != nil {
log.Error("%-v Unable to set HEAD as base branch in [%s]: %v\n%s\n%s", pr, tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
cancel()
return nil, nil, fmt.Errorf("Unable to set HEAD as base branch in tmpBasePath: %w\n%s\n%s", err, prCtx.outbuf.String(), prCtx.errbuf.String())
}
outbuf.Reset()
errbuf.Reset()

if err := addCacheRepo(tmpBasePath, headRepoPath); err != nil {
log.Error("Unable to add head repository to temporary repo [%s -> %s]: %v", pr.HeadRepo.FullName(), tmpBasePath, err)
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to head base repository to temporary repo [%s -> tmpBasePath]: %w", pr.HeadRepo.FullName(), err)
log.Error("%-v Unable to add head repository to temporary repo [%s -> %s]: %v", pr, pr.HeadRepo.FullName(), tmpBasePath, err)
cancel()
return nil, nil, fmt.Errorf("Unable to add head base repository to temporary repo [%s -> tmpBasePath]: %w", pr.HeadRepo.FullName(), err)
}

if err := git.NewCommand(ctx, "remote", "add").AddDynamicArguments(remoteRepoName, headRepoPath).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
log.Error("Unable to add head repository as head_repo [%s -> %s]: %v\n%s\n%s", pr.HeadRepo.FullName(), tmpBasePath, err, outbuf.String(), errbuf.String())
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
return "", fmt.Errorf("Unable to add head repository as head_repo [%s -> tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), err, outbuf.String(), errbuf.String())
Run(prCtx.RunOpts()); err != nil {
log.Error("%-v Unable to add head repository as head_repo [%s -> %s]: %v\n%s\n%s", pr, pr.HeadRepo.FullName(), tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
cancel()
return nil, nil, fmt.Errorf("Unable to add head repository as head_repo [%s -> tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), err, prCtx.outbuf.String(), prCtx.errbuf.String())
}
outbuf.Reset()
errbuf.Reset()

trackingBranch := "tracking"
// Fetch head branch
@@ -178,24 +178,18 @@ func createTemporaryRepo(ctx context.Context, pr *issues_model.PullRequest) (str
headBranch = pr.GetGitRefName()
}
if err := git.NewCommand(ctx, "fetch").AddArguments(fetchArgs...).AddDynamicArguments(remoteRepoName, headBranch+":"+trackingBranch).
Run(&git.RunOpts{
Dir: tmpBasePath,
Stdout: &outbuf,
Stderr: &errbuf,
}); err != nil {
if err := repo_module.RemoveTemporaryPath(tmpBasePath); err != nil {
log.Error("CreateTempRepo: RemoveTemporaryPath: %s", err)
}
Run(prCtx.RunOpts()); err != nil {
cancel()
if !git.IsBranchExist(ctx, pr.HeadRepo.RepoPath(), pr.HeadBranch) {
return "", models.ErrBranchDoesNotExist{
return nil, nil, models.ErrBranchDoesNotExist{
BranchName: pr.HeadBranch,
}
}
log.Error("Unable to fetch head_repo head branch [%s:%s -> tracking in %s]: %v:\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, tmpBasePath, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("Unable to fetch head_repo head branch [%s:%s -> tracking in tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), headBranch, err, outbuf.String(), errbuf.String())
log.Error("%-v Unable to fetch head_repo head branch [%s:%s -> tracking in %s]: %v:\n%s\n%s", pr, pr.HeadRepo.FullName(), pr.HeadBranch, tmpBasePath, err, prCtx.outbuf.String(), prCtx.errbuf.String())
return nil, nil, fmt.Errorf("Unable to fetch head_repo head branch [%s:%s -> tracking in tmpBasePath]: %w\n%s\n%s", pr.HeadRepo.FullName(), headBranch, err, prCtx.outbuf.String(), prCtx.errbuf.String())
}
outbuf.Reset()
errbuf.Reset()
prCtx.outbuf.Reset()
prCtx.errbuf.Reset()

return tmpBasePath, nil
return prCtx, cancel, nil
}
105 changes: 50 additions & 55 deletions services/pull/update.go
Original file line number Diff line number Diff line change
@@ -16,61 +16,67 @@ import (
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"
)

// Update updates pull request with base branch.
func Update(ctx context.Context, pull *issues_model.PullRequest, doer *user_model.User, message string, rebase bool) error {
var (
pr *issues_model.PullRequest
style repo_model.MergeStyle
)
func Update(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User, message string, rebase bool) error {
if pr.Flow == issues_model.PullRequestFlowAGit {
// TODO: update of agit flow pull request's head branch is unsupported
return fmt.Errorf("update of agit flow pull request's head branch is unsupported")
}

pullWorkingPool.CheckIn(fmt.Sprint(pull.ID))
defer pullWorkingPool.CheckOut(fmt.Sprint(pull.ID))
pullWorkingPool.CheckIn(fmt.Sprint(pr.ID))
defer pullWorkingPool.CheckOut(fmt.Sprint(pr.ID))

if rebase {
pr = pull
style = repo_model.MergeStyleRebaseUpdate
} else {
// use merge functions but switch repo's and branch's
pr = &issues_model.PullRequest{
HeadRepoID: pull.BaseRepoID,
BaseRepoID: pull.HeadRepoID,
HeadBranch: pull.BaseBranch,
BaseBranch: pull.HeadBranch,
}
style = repo_model.MergeStyleMerge
diffCount, err := GetDiverging(ctx, pr)
if err != nil {
return err
} else if diffCount.Behind == 0 {
return fmt.Errorf("HeadBranch of PR %d is up to date", pr.Index)
}

if pull.Flow == issues_model.PullRequestFlowAGit {
// TODO: Not support update agit flow pull request's head branch
return fmt.Errorf("Not support update agit flow pull request's head branch")
if rebase {
defer func() {
go AddTestPullRequestTask(doer, pr.BaseRepo.ID, pr.BaseBranch, false, "", "")
}()

return updateHeadByRebaseOnToBase(ctx, pr, doer, message)
}

if err := pr.LoadBaseRepo(ctx); err != nil {
log.Error("unable to load BaseRepo for %-v during update-by-merge: %v", pr, err)
return fmt.Errorf("unable to load BaseRepo for PR[%d] during update-by-merge: %w", pr.ID, err)
}
if err := pr.LoadHeadRepo(ctx); err != nil {
log.Error("LoadHeadRepo: %v", err)
return fmt.Errorf("LoadHeadRepo: %w", err)
} else if err = pr.LoadBaseRepo(ctx); err != nil {
log.Error("LoadBaseRepo: %v", err)
return fmt.Errorf("LoadBaseRepo: %w", err)
log.Error("unable to load HeadRepo for PR %-v during update-by-merge: %v", pr, err)
return fmt.Errorf("unable to load HeadRepo for PR[%d] during update-by-merge: %w", pr.ID, err)
}
if pr.HeadRepo == nil {
// LoadHeadRepo will swallow ErrRepoNotExist so if pr.HeadRepo is still nil recreate the error
err := repo_model.ErrRepoNotExist{
ID: pr.HeadRepoID,
}
log.Error("unable to load HeadRepo for PR %-v during update-by-merge: %v", pr, err)
return fmt.Errorf("unable to load HeadRepo for PR[%d] during update-by-merge: %w", pr.ID, err)
}

diffCount, err := GetDiverging(ctx, pull)
if err != nil {
return err
} else if diffCount.Behind == 0 {
return fmt.Errorf("HeadBranch of PR %d is up to date", pull.Index)
// use merge functions but switch repos and branches
reversePR := &issues_model.PullRequest{
ID: pr.ID,

HeadRepoID: pr.BaseRepoID,
HeadRepo: pr.BaseRepo,
HeadBranch: pr.BaseBranch,

BaseRepoID: pr.HeadRepoID,
BaseRepo: pr.HeadRepo,
BaseBranch: pr.HeadBranch,
}

_, err = rawMerge(ctx, pr, doer, style, "", message)
_, err = doMergeAndPush(ctx, reversePR, doer, repo_model.MergeStyleMerge, "", message)

defer func() {
if rebase {
go AddTestPullRequestTask(doer, pr.BaseRepo.ID, pr.BaseBranch, false, "", "")
return
}
go AddTestPullRequestTask(doer, pr.HeadRepo.ID, pr.HeadBranch, false, "", "")
go AddTestPullRequestTask(doer, reversePR.HeadRepo.ID, reversePR.HeadBranch, false, "", "")
}()

return err
@@ -159,27 +165,16 @@ func IsUserAllowedToUpdate(ctx context.Context, pull *issues_model.PullRequest,

// GetDiverging determines how many commits a PR is ahead or behind the PR base branch
func GetDiverging(ctx context.Context, pr *issues_model.PullRequest) (*git.DivergeObject, error) {
log.Trace("GetDiverging[%d]: compare commits", pr.ID)
if err := pr.LoadBaseRepo(ctx); err != nil {
return nil, err
}
if err := pr.LoadHeadRepo(ctx); err != nil {
return nil, err
}

tmpRepo, err := createTemporaryRepo(ctx, pr)
log.Trace("GetDiverging[%-v]: compare commits", pr)
prCtx, cancel, err := createTemporaryRepoForPR(ctx, pr)
if err != nil {
if !models.IsErrBranchDoesNotExist(err) {
log.Error("CreateTemporaryRepo: %v", err)
log.Error("CreateTemporaryRepoForPR %-v: %v", pr, err)
}
return nil, err
}
defer func() {
if err := repo_module.RemoveTemporaryPath(tmpRepo); err != nil {
log.Error("Merge: RemoveTemporaryPath: %s", err)
}
}()
defer cancel()

diff, err := git.GetDivergingCommits(ctx, tmpRepo, "base", "tracking")
diff, err := git.GetDivergingCommits(ctx, prCtx.tmpBasePath, baseBranch, trackingBranch)
return &diff, err
}
107 changes: 107 additions & 0 deletions services/pull/update_rebase.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,107 @@
// 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, message string) 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
}