mmdebstrap/tests/fail-without-username-in-etc-subuid

#!/bin/sh
set -eu
export LC_ALL=C.UTF-8
if [ ! -e /mmdebstrap-testenv ]; then
  echo "this test modifies the system and should only be run inside a container" >&2
  exit 1
fi
useradd --home-dir /home/user --create-home user
awk -F: '$1!="user"' /etc/subuid >/etc/subuid.tmp
mv /etc/subuid.tmp /etc/subuid
ret=0
runuser -u user -- {{ CMD }} --mode=unshare --variant=apt {{ DIST }} /tmp/debian-chroot {{ MIRROR }} || ret=$?
if [ "$ret" = 0 ]; then
  echo expected failure but got exit $ret >&2
  exit 1
fi
[ ! -e /tmp/debian-chroot ]