#!/bin/sh

[ "$#" -lt 1 ] && exit 0

find_mount_dev() {
	local mnt="$1"
	awk "\$2 == \"$mnt\" { print \$1 }" /proc/mounts | tail -n 1
}

zipl_gen_conf() {
	KERNEL_FLAVOR="-vanilla"
	RAMDISK_FLAVOR="-vanilla"
	
	rootdev=$(find_mount_dev "/")
	root_parm="root=$rootdev"
	_tmpfile="$(mktemp)"
	cat /proc/cmdline | tr A-Z a-z | xargs -n 1 | grep '=' > "$_tmpfile"
	. "$_tmpfile" > /dev/null 2>&1
	rm "$_tmpfile"

	cat > /etc/zipl.conf <<- EOF
	[defaultboot]
	defaultauto
	prompt=1
	timeout=5
	default=linux
	target=/boot
	[linux]
	image=/boot/vmlinuz$KERNEL_FLAVOR
	ramdisk=/boot/initramfs$RAMDISK_FLAVOR
	parameters="$root_parm dasd=$dasd s390x_net=$s390x_net"
	EOF
}

zipl_run() {
	zipl_gen_conf
	/sbin/zipl --verbose
}

"$1"