#!/bin/sh
set -eu
export LC_ALL=C.UTF-8
export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
trap "rm -f /tmp/chrootless.tar /tmp/root.tar" EXIT INT TERM
if [ ! -e /mmdebstrap-testenv ]; then
	echo "this test modifies the system and should only be run inside a container" >&2
	exit 1
fi

deb2qemu() {
	case "$1" in
		amd64) echo x86_64;;
		arm64) echo aarch64;;
		armel|armhf) echo arm;;
		ppc64el) echo ppc64le;;
		*) echo "$1";;
	esac
}
if [ "$(dpkg --print-architecture)" = "arm64" ]; then
	arch=amd64
else
	arch=arm64
fi

[ "$(id -u)" -eq 0 ]
[ -e "/proc/sys/fs/binfmt_misc/qemu-$(deb2qemu "$arch")" ]


# we need --hook-dir=./hooks/merged-usr because usrmerge does not understand
# DPKG_ROOT
#
# dpkg is unable to install architecture arch:all packages with a
# dependency on an arch:any package (perl-modules-5.34 in this case)
# inside foreign architecture chrootless chroots, because dpkg will use
# its own architecture as the native architecture, see #825385 and #1020533
# So we are not testing the installation of apt,build-essential here.
for INCLUDE in '' 'apt' 'systemd-sysv'; do
	echo 1 > "/proc/sys/fs/binfmt_misc/qemu-$(deb2qemu "$arch")"
	arch-test "$arch"
	{{ CMD }} --mode=root --architecture="$arch" --variant={{ VARIANT }} \
		--hook-dir=./hooks/merged-usr ${INCLUDE:+--include="$INCLUDE"} \
		{{ DIST }} "/tmp/root.tar" {{ MIRROR }}
	echo 0 > "/proc/sys/fs/binfmt_misc/qemu-$(deb2qemu "$arch")"
	arch-test "$arch" && exit 1
	{{ CMD }} --mode=chrootless --architecture="$arch" --variant={{ VARIANT }} \
		--hook-dir=./hooks/merged-usr ${INCLUDE:+--include="$INCLUDE"} \
		--skip=check/chrootless {{ DIST }} "/tmp/chrootless.tar" {{ MIRROR }}
	# when creating a foreign architecture chroot, the tarballs are not
	# bit-by-bit identical but contain a few remaining differences:
	#
	#  * /etc/ld.so.cache -- hard problem, must be solved in glibc upstream
	#  * /var/lib/dpkg/triggers -- #990712
	#  * /var/cache/debconf/*.dat-old -- needs investigation
	for tar in root chrootless; do
		<"/tmp/$tar.tar" \
		./tarfilter \
			--path-exclude=/var/cache/debconf/config.dat-old \
			--path-exclude=/var/cache/debconf/templates.dat-old \
			--path-exclude=/etc/ld.so.cache \
			--path-exclude=/var/lib/dpkg/triggers/File \
			--path-exclude=/var/lib/dpkg/triggers/ldconfig \
			> "/tmp/$tar.tar.tmp"
		mv "/tmp/$tar.tar.tmp" "/tmp/$tar.tar"
	done
	cmp /tmp/root.tar /tmp/chrootless.tar || diffoscope /tmp/root.tar /tmp/chrootless.tar
	rm /tmp/chrootless.tar /tmp/root.tar
done