#!/bin/sh -e

. /usr/share/debconf/confmodule

log() {
	logger -t zipl-installer "$@"
}

info() {
	log "info: $@"
}

findfs() {
	mount | grep "on /target${1%/} " | tail -n1 | cut -d' ' -f1
}

rootfs_devfs="$(findfs /)"
rootfs="$(mapdevfs $rootfs_devfs)"
log "Root filesystem on ${rootfs} (${rootfs_devfs})"

PARAMETER="root=${rootfs}"
if rootlvm="$(lvm lvdisplay -C -ovg_name,lv_name --noheadings ${rootfs})"
then
    info "Root filesystem is on LV (${rootlvm})"
elif rootuuid="$(block-attr --uuid ${rootfs})"
then
    info "Root filesystem UUID is ${rootuuid}"
    PARAMETER="root=UUID=${rootuuid}"
fi

subvol="$(btrfs subvolume show /target 2>/dev/null | sed -n '2s/.*:[\t ]*//p')"
if [ -n "$subvol" ]
then
    info "Root filesystem on btrfs subvolume ${subvol}"
    PARAMETER="$PARAMETER rootflags=subvol=${subvol}"
fi

cat > /target/etc/zipl.conf << EOF
[defaultboot]
defaultmenu = menu

:menu
target = /boot
1 = debian
2 = old
default = 1
prompt = 1
timeout = 10

[debian]
target = /boot
image = /boot/vmlinuz
ramdisk = /boot/initrd.img
parameters = $PARAMETER

[old]
target = /boot
image = /boot/vmlinuz.old
ramdisk = /boot/initrd.img.old
parameters = $PARAMETER
optional = 1
EOF

sed -e 's/^do_bootloader.*$/do_bootloader = yes/' < /target/etc/kernel-img.conf > /target/etc/kernel-img.conf.$$
mv /target/etc/kernel-img.conf.$$ /target/etc/kernel-img.conf

mount -o bind /proc /target/proc || true
mount -o bind /sys /target/sys || true
mount -o bind /dev /target/dev || true

rc=0
if ! log-output -t zipl-installer chroot /target /sbin/zipl -V; then
       # Unmount the bound file systems before exiting
       rc=1
fi

umount /target/dev || true
umount /target/sys || true
umount /target/proc || true

exit $rc