1 files changed, 16 insertions, 10 deletions

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 262809c787..635bbdfc88 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -179,13 +179,15 @@ static void add_merge_config(struct ref **head,
 	}
 }
 
-static int add_existing(const char *refname, const unsigned char *sha1,
+static int add_existing(const char *refname, const struct object_id *oid,
 			int flag, void *cbdata)
 {
 	struct string_list *list = (struct string_list *)cbdata;
 	struct string_list_item *item = string_list_insert(list, refname);
-	item->util = xmalloc(20);
-	hashcpy(item->util, sha1);
+	struct object_id *old_oid = xmalloc(sizeof(*old_oid));
+
+	oidcpy(old_oid, oid);
+	item->util = old_oid;
 	return 0;
 }
 
@@ -415,8 +417,10 @@ static int s_update_ref(const char *action,
 
 	transaction = ref_transaction_begin(&err);
 	if (!transaction ||
-	    ref_transaction_update(transaction, ref->name, ref->new_sha1,
-				   ref->old_sha1, 0, check_old, msg, &err))
+	    ref_transaction_update(transaction, ref->name,
+				   ref->new_sha1,
+				   check_old ? ref->old_sha1 : NULL,
+				   0, msg, &err))
 		goto fail;
 
 	ret = ref_transaction_commit(transaction, &err);
@@ -586,7 +590,8 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 	struct strbuf note = STRBUF_INIT;
 	const char *what, *kind;
 	struct ref *rm;
-	char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
+	char *url;
+	const char *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
 	int want_status;
 
 	fp = fopen(filename, "a");
@@ -820,7 +825,7 @@ static void check_not_current_branch(struct ref *ref_map)
 
 static int truncate_fetch_head(void)
 {
-	char *filename = git_path("FETCH_HEAD");
+	const char *filename = git_path("FETCH_HEAD");
 	FILE *fp = fopen(filename, "w");
 
 	if (!fp)
@@ -910,9 +915,10 @@ static int do_fetch(struct transport *transport,
 			struct string_list_item *peer_item =
 				string_list_lookup(&existing_refs,
 						   rm->peer_ref->name);
-			if (peer_item)
-				hashcpy(rm->peer_ref->old_sha1,
-					peer_item->util);
+			if (peer_item) {
+				struct object_id *old_oid = peer_item->util;
+				hashcpy(rm->peer_ref->old_sha1, old_oid->hash);
+			}
 		}
 	}