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

#!/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
sysctl -w kernel.unprivileged_userns_clone=1
export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
{{ CMD }} --mode=root --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-root.{{ FORMAT }} {{ MIRROR }}
if [ "{{ FORMAT }}" = tar ]; then
	printf 'ustar ' | cmp --bytes=6 --ignore-initial=257:0 /tmp/debian-chroot-root.tar -
elif [ "{{ FORMAT }}" = squashfs ]; then
	printf 'hsqs' | cmp --bytes=4 /tmp/debian-chroot-root.squashfs -
elif [ "{{ FORMAT }}" = ext2 ]; then
	printf '\123\357' | cmp --bytes=2 --ignore-initial=1080:0 /tmp/debian-chroot-root.ext2 -
else
	echo "unknown format: {{ FORMAT }}" >&2
	exit 1
fi
runuser -u user -- {{ CMD }} --mode=unshare --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-unshare.{{ FORMAT }} {{ MIRROR }}
cmp /tmp/debian-chroot-root.{{ FORMAT }} /tmp/debian-chroot-unshare.{{ FORMAT }}
rm /tmp/debian-chroot-unshare.{{ FORMAT }}
case {{ VARIANT }} in essential|apt|minbase|buildd)
	# variants important and standard differ because permissions drwxr-sr-x
	# and extended attributes of ./var/log/journal/ cannot be preserved
	# in fakechroot mode
	runuser -u user -- {{ CMD }} --mode=fakechroot --variant={{ VARIANT }} {{ DIST }} /tmp/debian-chroot-fakechroot.{{ FORMAT }} {{ MIRROR }}
	cmp /tmp/debian-chroot-root.{{ FORMAT }} /tmp/debian-chroot-fakechroot.{{ FORMAT }}
	rm /tmp/debian-chroot-fakechroot.{{ FORMAT }}
	;;
esac
# 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
rm /tmp/debian-chroot-root.{{ FORMAT }}