From: Jeff King <peff@peff.net>
Date: Sun, 08 Apr 2012 04:48:25 GMT
Subject: Re: [PATCH 01/12] tests: add initial bash completion tests
Message-ID: <20120408044825.GA4296@sigill.intra.peff.net>
In-Reply-To: <7vpqbiyhmu.fsf@alter.siamese.dyndns.org>

On Sat, Apr 07, 2012 at 09:25:29PM -0700, Junio C Hamano wrote:

> Bash has a special case code to behave in a "posixly correct" mode, where
> a lot of extensions are disabled, when invoked as "sh".  Unfortunately, it
> still defines BASH_* variables, including BASH, when operating in this
> mode.
> [...]
> So we may want to be a bit more careful like this:
> 
> if test "z${BASH%/bash}" != "z${BASH}"
> then
> 	: ends with bash so we are already running bash as bash

If bash is in posix mode (including "bash --posix" and being invoked as
"bin/sh"), it will set POSIXLY_CORRECT (but not export it). Similarly,
if POSIXLY_CORRECT is set in the outer environment, it will act more
like sh. So maybe that would be a better test.

-Peff