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From:   <rsbecker@nexbridge.com>
To:     "'Carlo Arenas'" <carenas@gmail.com>
Cc:     "'Junio C Hamano'" <gitster@pobox.com>, <git@vger.kernel.org>
References: <20220428033544.68188-1-carenas@gmail.com> <20220428105852.94449-1-carenas@gmail.com> <20220428105852.94449-4-carenas@gmail.com> <xmqq7d79du6c.fsf@gitster.g> <000001d85b39$9d5cfc90$d816f5b0$@nexbridge.com> <CAPUEsph+p-fD8vMOMU4Djkc8cFUmm=9JVFdgaxkQ4-CpKZgnCA@mail.gmail.com> <000801d85b40$ac11ec80$0435c580$@nexbridge.com> <CAPUEspgcd1CYTfL=ug3WtnOrJscWbyQXeF-2SQ_24KcCTkuRkA@mail.gmail.com>
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Subject: RE: [PATCH v2 3/3] t: add tests for safe.directory when running with sudo
Date:   Thu, 28 Apr 2022 17:55:28 -0400
Organization: Nexbridge Inc.
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On April 28, 2022 4:56 PM, Carlo Arenas wrote:
>On Thu, Apr 28, 2022 at 1:43 PM <rsbecker@nexbridge.com> wrote:
>> I tried to find is_root in POSIX but could not. Do you have a reference? It is not in
>bash 4.3.48, which is on our older system.
>
>my bad; is_root is a helper function i provided as part of this file; the latest version
>which should work in your posix system AND was specifically written to hopefully
>not break with NON-STOP based on what you told us about it looks like (hand
>edited and not tested) :
>
>is_root() {
>  id -u >u
>  id -u root >r
>  cmp u r
>}

This is about as portable as I can find and works even in ksh. It could be optimized.

is_root() {
  id -u >u
  id -u root >r
  cmp -s u r
  if [ $? -ne 0 ]; then
    echo 0
  else
    echo 1
  fi
}

if [ `is_root` -ne 0 ]; then
        echo root
else
        echo Not root
fi