From: Jeff King <peff@peff.net>
Date: Wed, 03 Mar 2010 20:42:57 GMT
Subject: Re: Latest master failing t7401 submodule tests
Message-ID: <20100303204257.GA5501@coredump.intra.peff.net>
In-Reply-To: <7vhboxno38.fsf@alter.siamese.dyndns.org>

On Wed, Mar 03, 2010 at 12:32:11PM -0800, Junio C Hamano wrote:

> Jeff King <peff@peff.net> writes:
> 
> > I did see it on my debian unstable box with with dash as /bin/sh (though
> 
> 3deea89 (submodule summary: Don't barf when invoked in an empty repo,
> 2010-02-16) looks broken.  It shifts $1 unconditionally when:

Yeah, I can confirm that the breakage was introduced there (and it looks
like for bash, an extra "shift" is a failing command but doesn't make
the shell barf, but for dash it is more serious, which explains why
tests passed for you).

>  - "git submodule summary", no arguments given and defaults to HEAD which
>    is _not_ unborn (we shouldn't shift in this case);

Yes, definitely a bug.

>  - "git submodule summary HEAD path...", which is not unborn (we should shift);

Yes, and I think we do that part right.

>  - "git submodule summary path...", defaults to HEAD which is _not_ unborn
>    (we shouldn't shift).

I don't think this is a problem. We do:

  git rev-parse -q --verify --default HEAD path

and it correctly reports failure, so we never do the problematic shift.

So I think we just need

diff --git a/git-submodule.sh b/git-submodule.sh
index 1ea4143..bf5ea50 100755
--- a/git-submodule.sh
+++ b/git-submodule.sh
@@ -556,7 +556,7 @@ cmd_summary() {
 	if rev=$(git rev-parse -q --verify --default HEAD ${1+"$1"})
 	then
 		head=$rev
-		shift
+		test -n "$1" && shift
 	elif test -z "$1" -o "$1" = "HEAD"
 	then
 		return

-Peff