From 5cef295f283e84351a104c66f949a53a56297aa7 Mon Sep 17 00:00:00 2001
From: Derrick Stolee <dstolee@microsoft.com>
Date: Mon, 20 Aug 2018 18:24:32 +0000
Subject: [PATCH] commit-graph: not compatible with uninitialized repo

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 commit-graph.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/commit-graph.c b/commit-graph.c
index c4eaedf4e5..cee2caab5c 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -62,6 +62,9 @@ extern int read_replace_refs;
 
 static int commit_graph_compatible(struct repository *r)
 {
+	if (!r->gitdir)
+		return 0;
+
 	if (read_replace_refs) {
 		prepare_replace_object(r);
 		if (hashmap_get_size(&r->objects->replace_map->map))