git: mark cmd_rebase as requiring a worktree

We skipped marking the "rebase" built-in as requiring a .git/ directory
and a worktree only to allow to spawn the scripted version of `git
rebase`.

Now that we no longer have that escape hatch, we can change that to the
canonical form.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rebase.c

@@ -1486,10 +1486,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		usage_with_options(builtin_rebase_usage,
 				   builtin_rebase_options);
 
-	prefix = setup_git_directory();
-	trace_repo_setup(prefix);
-	setup_work_tree();
-
 	options.allow_empty_message = 1;
 	git_config(rebase_config, &options);
 

git.c

@@ -549,12 +549,7 @@ static struct cmd_struct commands[] = {
 	{ "push", cmd_push, RUN_SETUP },
 	{ "range-diff", cmd_range_diff, RUN_SETUP | USE_PAGER },
 	{ "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
-	/*
-	 * NEEDSWORK: Until the rebase is independent and needs no redirection
-	 * to rebase shell script this is kept as is, then should be changed to
-	 * RUN_SETUP | NEED_WORK_TREE
-	 */
-	{ "rebase", cmd_rebase },
+	{ "rebase", cmd_rebase, RUN_SETUP | NEED_WORK_TREE },
 	{ "rebase--interactive", cmd_rebase__interactive, RUN_SETUP | NEED_WORK_TREE },
 	{ "receive-pack", cmd_receive_pack },
 	{ "reflog", cmd_reflog, RUN_SETUP },