From: Kyle J. McKay <mackyle@gmail.com>
Date: Fri, 16 Jan 2015 03:27:34 GMT
Subject: Re: [PATCH] t/lib-httpd: switch SANITY check for NOT_ROOT
Message-ID: <BEFF558C-774D-4891-96A0-BE962F8070E7@gmail.com>
In-Reply-To: <20150116013256.GA25894@peff.net>

On Jan 15, 2015, at 17:32, Jeff King wrote:

> On Thu, Jan 15, 2015 at 04:04:24PM -0800, Junio C Hamano wrote:
>
>> I wondered what 'perl -e 'print $>' would say in mingw, and if that
>> is portable enough, though.
>
> Good thinking. I guess the best way to find out is to convince  
> somebody
> from msysgit to try this patch. :)
>
> We may simply find that nobody there even has apache installed on  
> their
> box, and they do not run the http tests at all.
>
[...]
> We implement NOT_ROOT by checking perl's "$>" variable,
> since we cannot rely on the "id" program being available
> everywhere (and we would rather avoid writing a custom C
> program to run geteuid if we can).

Does it make a difference that id is POSIX [1]?

So the test "if [ $(id -u) = 0 ]" or similar ought to work.

"id -u" works for me in MSYS and cygwin (each appears to have it's own  
id.exe).

> +
> +test_lazy_prereq NOT_ROOT '
> +	uid=$(perl -e "print \$<") &&
> +	test "$uid" != 0
> +'

Does NO_PERL affect this?  Or is Perl always required to run the tests.

Also "$<" is real user id.  Don't you want effective user id ("$>"),  
that's what the comment says...

Both "$<" and "$>" work for me in MSYS and cygwin although if I run it  
from cmd.exe using strawberry perl, both "$<" and "$>" give 0.   
(There's no id.exe for cmd.exe unless it finds the cygwin/msys one.)

As long as NO_PERL is not also intended to affect "make test" either  
the perl or id version seems fine  to me (as long as it's Perl's "$>")  
since I doubt the tests would run with just cmd.exe. :)

-Kyle

[1] http://pubs.opengroup.org/onlinepubs/009604499/utilities/id.html