#!/bin/sh
#
# make sure that the $FAKECHROOT_CMD_SUBST environment variable is set up
# such that one can create a merged-/usr chroot from an unmerged-/usr system

set -eu
export LC_ALL=C.UTF-8
export SOURCE_DATE_EPOCH={{ SOURCE_DATE_EPOCH }}
trap "rm -f /tmp/chroot-fakechroot.tar /tmp/chroot-root.tar" EXIT INT TERM
[ "$(whoami)" = "root" ]
{{ CMD }} --mode=root --variant=apt --hook-dir=./hooks/merged-usr {{ DIST }} /tmp/chroot-root.tar {{ MIRROR }}
cat << 'SCRIPT' > script.sh
#!/bin/sh
set -exu
rootfs="$1"
mkdir -p "$rootfs/mnt/hooks"
[ -e /usr/libexec/mmdebstrap/ldconfig.fakechroot ] && cp -a /usr/libexec/mmdebstrap/ldconfig.fakechroot "$rootfs/mnt"
[ -e ./ldconfig.fakechroot ] && cp -a ./ldconfig.fakechroot "$rootfs/mnt"
[ -e /usr/share/mmdebstrap/hooks/merged-usr ] && cp -a /usr/share/mmdebstrap/hooks/merged-usr "$rootfs/mnt/hooks"
[ -e ./hooks/merged-usr ] && cp -a ./hooks/merged-usr "$rootfs/mnt/hooks"
[ -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 \
	runuser -u user -- \
	{{ CMD }} --mode=fakechroot --variant=apt \
	--hook-dir=./hooks/merged-usr \
	--customize-hook='chroot "$1" echo "$FAKECHROOT_CMD_SUBST" | tr ":" "\n" | sort' \
	--customize-hook='chroot "$1" sh -c "exec test \"\$(readlink /bin)\" = usr/bin"' \
	--customize-hook='chroot "$1" sh -c "exec test \"\$(realpath -e /bin/ldd)\" = /usr/bin/ldd"' \
	--customize-hook='chroot "$1" echo ":$FAKECHROOT_CMD_SUBST" | grep --quiet :/usr/bin/ldd=' \
	--customize-hook='chroot "$1" echo ":$FAKECHROOT_CMD_SUBST" | grep --quiet :/bin/ldd=' \
	--customize-hook='chroot "$1" env PATH=/bin ldd /bin/true 2>&1 | grep --quiet "fakeldd: objdump: command not found: install binutils package"' \
	--customize-hook='chroot "$1" sh -c "exec test \"\$(readlink /sbin)\" = usr/sbin"' \
	--customize-hook='chroot "$1" sh -c "exec test \"\$(realpath -e /sbin/ldconfig)\" = /usr/sbin/ldconfig"' \
	--customize-hook='chroot "$1" echo ":$FAKECHROOT_CMD_SUBST" | grep --quiet :/usr/sbin/ldconfig=' \
	--customize-hook='chroot "$1" echo ":$FAKECHROOT_CMD_SUBST" | grep --quiet :/sbin/ldconfig=' \
	--customize-hook='chroot "$1" env PATH=/sbin ldconfig 2>&1 | grep --quiet "/usr/bin/env: ‘python3’: No such file or directory"' \
	{{ DIST }} /tmp/chroot-fakechroot.tar {{ MIRROR }}
SCRIPT
chmod +x script.sh
{{ CMD }} --mode=root --variant=apt --include=perl,python3,passwd,fakeroot,fakechroot \
	--hook-dir=./hooks/no-merged-usr \
	--customize-hook='chroot "$1" useradd --home-dir /home/user --create-home user' \
	--customize-hook='chroot "$1" sh -c "exec test \"\$(realpath -e /usr/bin/ldd)\" = /usr/bin/ldd"' \
	--customize-hook='chroot "$1" sh -c "exec test ! -e /usr/sbin/ldconfig"' \
	--customize-hook=./script.sh \
	--customize-hook="copy-out /tmp/chroot-fakechroot.tar /tmp" \
	{{ DIST }} /dev/null {{ MIRROR }}
cmp /tmp/chroot-fakechroot.tar /tmp/chroot-root.tar