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

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#!/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
adduser --gecos user --disabled-password user
sysctl -w kernel.unprivileged_userns_clone=1
export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
mount -o size=4G -t tmpfs tmpfs /tmp # workaround for #1010957
{{ 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
rm /tmp/debian-chroot-root.{{ FORMAT }}