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Ensure that all unmerged files are merged when conflict checking (#20528) (#20536)

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There is a subtle bug in the code relating to collating the results of
`git ls-files -u -z` in `unmergedFiles()`. The code here makes the
mistake of assuming that every unmerged file will always have a stage 1
conflict, and this results in conflicts that occur in stage 3 only being
dropped.

This PR simply adjusts this code to ensure that any empty unmergedFile
will always be passed down the channel.

The PR also adds a lot of Trace commands to attempt to help find future
bugs in this code.

Fix #19527

Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: zeripath <art27@cantab.net>
This commit is contained in:
6543 2022-07-29 15:37:18 +02:00 • committed by GitHub
parent d6bc1558c6
commit 210b096da7
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2 changed files with 27 additions and 2 deletions
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4
services/pull/patch.go
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@ -124,6 +124,7 @@ func (e *errMergeConflict) Error() string {
}
func attemptMerge(ctx context.Context, file *unmergedFile, tmpBasePath string, gitRepo *git.Repository) error {
log.Trace("Attempt to merge:\n%v", file)
switch {
case file.stage1 != nil && (file.stage2 == nil || file.stage3 == nil):
// 1. Deleted in one or both:
@ -295,7 +296,8 @@ func checkConflicts(ctx context.Context, pr *issues_model.PullRequest, gitRepo *
var treeHash string
treeHash, _, err = git.NewCommand(ctx, "write-tree").RunStdString(&git.RunOpts{Dir: tmpBasePath})
if err != nil {
return false, err
lsfiles, _, _ := git.NewCommand(ctx, "ls-files", "-u").RunStdString(&git.RunOpts{Dir: tmpBasePath})
return false, fmt.Errorf("unable to write unconflicted tree: %w\n`git ls-files -u`:\n%s", err, lsfiles)
}
treeHash = strings.TrimSpace(treeHash)
baseTree, err := gitRepo.GetTree("base")