odb: Prevent stream_finalize_write() from overwriting

Now that #1785 is merged, git_odb_stream_finalize_write() calculates the object id before invoking the odb backend.

This commit gives a chance to the backend to check if it already knows this object.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/odb.c b/src/odb.c
index e47715f79..dfb252178 100644
--- a/src/odb.c
+++ b/src/odb.c
@@ -900,6 +900,10 @@ int git_odb_stream_write(git_odb_stream *stream, const char *buffer, size_t len)
 int git_odb_stream_finalize_write(git_oid *out, git_odb_stream *stream)
 {
 	git_hash_final(out, stream->hash_ctx);
+
+	if (git_odb_exists(stream->backend->odb, out))
+		return 0;
+
 	return stream->finalize_write(stream, out);
 }