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Fix rebase conflict detection in git 2.26 (#10929)

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* Fix rebase conflict detection in git 2.26

Git changed the technique used in rebase from
simple apply-patches to use merge. This breaks
our conflict detection code.

Signed-off-by: Andrew Thornton <art27@cantab.net>

* As per @techknowlogick reduce copying

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2020-04-03 17:00:41 +01:00 committed by GitHub
parent 57cca44c5e
commit 97eb37e823
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1 changed files with 23 additions and 6 deletions
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25
services/pull/merge.go
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@ -263,17 +263,34 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge
if err := git.NewCommand("rebase", baseBranch).RunInDirPipeline(tmpBasePath, &outbuf, &errbuf); err != nil {
// Rebase will leave a REBASE_HEAD file in .git if there is a conflict
if _, statErr := os.Stat(filepath.Join(tmpBasePath, ".git", "REBASE_HEAD")); statErr == nil {
// The original commit SHA1 that is failing will be in .git/rebase-apply/original-commit
commitShaBytes, readErr := ioutil.ReadFile(filepath.Join(tmpBasePath, ".git", "rebase-apply", "original-commit"))
var commitSha string
ok := false
failingCommitPaths := []string{
filepath.Join(tmpBasePath, ".git", "rebase-apply", "original-commit"), // Git < 2.26
filepath.Join(tmpBasePath, ".git", "rebase-merge", "stopped-sha"), // Git >= 2.26
}
for _, failingCommitPath := range failingCommitPaths {
if _, statErr := os.Stat(filepath.Join(failingCommitPath)); statErr == nil {
commitShaBytes, readErr := ioutil.ReadFile(filepath.Join(failingCommitPath))
if readErr != nil {
// Abandon this attempt to handle the error
log.Error("git rebase staging on to base [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("git rebase staging on to base [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
log.Debug("RebaseConflict at %s [%s:%s -> %s:%s]: %v\n%s\n%s", strings.TrimSpace(string(commitShaBytes)), pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
commitSha = strings.TrimSpace(string(commitShaBytes))
ok = true
break
}
}
if !ok {
log.Error("Unable to determine failing commit sha for this rebase message. Cannot cast as models.ErrRebaseConflicts.")
log.Error("git rebase staging on to base [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return "", fmt.Errorf("git rebase staging on to base [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
}
log.Debug("RebaseConflict at %s [%s:%s -> %s:%s]: %v\n%s\n%s", commitSha, pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
return "", models.ErrRebaseConflicts{
Style: mergeStyle,
CommitSHA: strings.TrimSpace(string(commitShaBytes)),
CommitSHA: commitSha,
StdOut: outbuf.String(),
StdErr: errbuf.String(),
Err: err,