replace: make sure --edit results in a different object
It's a bad idea to create a replace ref for an object
that points to the original object itself.
That's why we have to check if the result from editing
the original object is a different object and error out
if it isn't.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/replace.c b/builtin/replace.c
index 3da1bae..0751804 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -275,6 +275,9 @@
free(tmpfile);
+ if (!hashcmp(old, new))
+ return error("new object is the same as the old one: '%s'", sha1_to_hex(old));
+
return replace_object_sha1(object_ref, old, "replacement", new, force);
}
