[PATCH 42/43] builtins: setup repository before print unknown command error

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

help_unknown_cmd() will need to look into repository's config, in
order to collect all possible commands/aliases and give a
suggestion. So, repository must be set up before this function is
called.

As it is now, because
 - alias handling will always be done before help_unknown_cmd()
 - alias handling code will search and set up repository if found
 - alias handline code will not undo repository setup

These ensure that repository will always be set up (or attempted to
set up) before help_unknown_cmd(), so there is no issue. But the setup
dependency here is subtle. It may break some day if someone reorders
the loop, for example.

Make a note about this.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 git.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/git.c b/git.c
index 43cebd7..1fb478f 100644
--- a/git.c
+++ b/git.c
@@ -555,6 +555,13 @@ int main(int argc, const char **argv)
 			exit(1);
 		}
 		if (!done_help) {
+			/*
+			 * help_unknown_cmd() requires that a repository has been
+			 * searched for and set up if found.
+			 * Luckily, the alias handling code already took care of this.
+			 */
+			if (!startup_info->have_run_setup_gitdir)
+				die("internal error: handling unknown command");
 			cmd = argv[0] = help_unknown_cmd(cmd);
 			done_help = 1;
 		} else
-- 
1.7.0.rc1.541.g2da82.dirty