mmdebstrap/tests/custom-tmpdir

#!/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
# https://www.etalabs.net/sh_tricks.html
quote () { printf %s\\n "$1" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/" ; }
adduser --gecos user --disabled-password user
sysctl -w kernel.unprivileged_userns_clone=1
homedir=$(runuser -u user -- sh -c 'cd && pwd')
# apt:test/integration/test-apt-key
TMPDIR_ADD="This is fü\$\$ing cràzy, \$(apt -v)\$!"
runuser -u user -- mkdir "$homedir/$TMPDIR_ADD"
# make sure the unshared user can traverse into the TMPDIR
chmod 711 "$homedir"
# set permissions and sticky bit like the real /tmp
chmod 1777 "$homedir/$TMPDIR_ADD"
runuser -u user -- env TMPDIR="$homedir/$TMPDIR_ADD" {{ CMD }} --mode=unshare --variant=apt \
	--setup-hook='case "$1" in '"$(quote "$homedir/$TMPDIR_ADD/mmdebstrap.")"'??????????) exit 0;; *) echo "$1"; exit 1;; esac' \
	 {{ DIST }} /tmp/debian-chroot.tar {{ MIRROR }}
tar -tf /tmp/debian-chroot.tar | sort | diff -u tar1.txt -
# use rmdir as a quick check that nothing is remaining in TMPDIR
runuser -u user -- rmdir "$homedir/$TMPDIR_ADD"
rm /tmp/debian-chroot.tar