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-rw-r--r--storage/filesystem/internal/dotgit/dotgit.go4
1 files changed, 4 insertions, 0 deletions
diff --git a/storage/filesystem/internal/dotgit/dotgit.go b/storage/filesystem/internal/dotgit/dotgit.go
index e60ffca..cb3adc8 100644
--- a/storage/filesystem/internal/dotgit/dotgit.go
+++ b/storage/filesystem/internal/dotgit/dotgit.go
@@ -294,6 +294,10 @@ func (d *DotGit) SetRef(r, old *plumbing.Reference) error {
defer ioutil.CheckClose(f, &err)
+ // Lock is unlocked by the deferred Close above. This is because Unlock
+ // does not imply a fsync and thus there would be a race between
+ // Unlock+Close and other concurrent writers. Adding Sync to go-billy
+ // could work, but this is better (and avoids superfluous syncs).
err = f.Lock()
if err != nil {
return err