mmdebstrap/tests/check-for-bit-by-bit-identical-format-output

#!/bin/sh
set -eu
export LC_ALL=C.UTF-8
export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}

trap "rm -f /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }}" EXIT INT TERM

case {{ MODE }} in unshare | fakechroot) : ;; *) exit 1 ;; esac

prefix=
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} --"
fi

$prefix {{ CMD }} --mode={{ MODE }} --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} {{ MIRROR }}
cmp ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.{{ FORMAT }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }} \
  || diffoscope ./cache/mmdebstrap-{{ DIST }}-{{ VARIANT }}.{{ FORMAT }} /tmp/debian-chroot-{{ MODE }}.{{ FORMAT }}

# we cannot test chrootless mode here, because mmdebstrap relies on the
# usrmerge package to set up merged-/usr and that doesn't work in chrootless
# mode