mmdebstrap/tests/unshare-as-root-user-inside-chroot

#!/bin/sh
#
# Before running unshare mode as root, we run "unshare --mount" but that fails
# if mmdebstrap itself is executed from within a chroot:
# unshare: cannot change root filesystem propagation: Invalid argument
# This test tests the workaround in mmdebstrap using --propagation unchanged

set -eu
export LC_ALL=C.UTF-8
[ "$(whoami)" = "root" ]
trap "rm -f /tmp/debian-chroot.tar script.sh" EXIT INT TERM
cat <<'SCRIPT' >script.sh
#!/bin/sh
set -eu
rootfs="$1"
mkdir -p "$rootfs/mnt"
[ -e /usr/bin/mmdebstrap ] && cp -aT /usr/bin/mmdebstrap "$rootfs/usr/bin/mmdebstrap"
[ -e ./mmdebstrap ] && cp -aT ./mmdebstrap "$rootfs/mnt/mmdebstrap"
chroot "$rootfs" env --chdir=/mnt \
	{{ CMD }} --mode=unshare --variant=apt \
	{{ DIST }} /tmp/debian-chroot.tar {{ MIRROR }}
SCRIPT
chmod +x script.sh
{{ CMD }} --mode=root --variant=apt --include=perl,mount \
  --customize-hook=./script.sh \
  --customize-hook="download /tmp/debian-chroot.tar /tmp/debian-chroot.tar" \
  {{ DIST }} /dev/null {{ MIRROR }}
tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -