replay: die() instead of failing assert()

It's not a good idea for regular Git commands to use an assert() to
check for things that could happen but are not supported.

Let's die() with an explanation of the issue instead.

Co-authored-by: Christian Couder <[email protected]>
Signed-off-by: Elijah Newren <[email protected]>
Signed-off-by: Christian Couder <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: 2 people

builtin/replay.c

@@ -179,7 +179,12 @@ int cmd_replay(int argc, const char **argv, const char *prefix)
 
 		fprintf(stderr, "Rebasing %s...\r",
 			oid_to_hex(&commit->object.oid));
-		assert(commit->parents && !commit->parents->next);
+
+		if (!commit->parents)
+			die(_("replaying down to root commit is not supported yet!"));
+		if (commit->parents->next)
+			die(_("replaying merge commits is not supported yet!"));
+
 		base = commit->parents->item;
 
 		next_tree = repo_get_commit_tree(the_repository, commit);