mmdebstrap/tests/create-tarball-dry-run

#!/bin/sh
#
# we are testing all variants here because with 0.7.5 we had a bug:
# mmdebstrap sid /dev/null --simulate ==> E: cannot read /var/cache/apt/archives/

set -eu
export LC_ALL=C.UTF-8
prefix=
include=,
if [ "$(id -u)" -eq 0 ] && [ "{{ MODE }}" != root ] && [ "{{ MODE }}" != auto ]; then
  if ! id "${SUDO_USER:-user}" >/dev/null 2>&1; then
    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/${SUDO_USER:-user}" --create-home "${SUDO_USER:-user}"
  fi
  prefix="runuser -u ${SUDO_USER:-user} --"
  if [ "{{ VARIANT }}" = extract ] || [ "{{ VARIANT }}" = custom ]; then
    include="$(tr '\n' ',' <pkglist.txt)"
  fi
fi
$prefix {{ CMD }} --mode={{ MODE }} --include="$include" --dry-run --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot.tar {{ MIRROR }}
if [ -e /tmp/debian-chroot.tar ]; then
  echo "/tmp/debian-chroot.tar must not be created with --dry-run" >&2
  exit 1
fi