RE: [PATCH v2 3/3] t: add tests for safe.directory when running with sudo

From: rsbecker@nexbridge.com <rsbecker@nexbridge.com>
Date: Apr 28, 2022, 21:55 UTC
Message-ID: <000f01d85b4a$af8c3aa0$0ea4afe0$@nexbridge.com>
In-Reply-To: <CAPUEspgcd1CYTfL=ug3WtnOrJscWbyQXeF-2SQ_24KcCTkuRkA@mail.gmail.com>

On April 28, 2022 4:56 PM, Carlo Arenas wrote:

Show 14 quoted lines

>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