#!/bin/sh
# vi: ts=4 noexpandtab
#
# This is the initramfs init script
ROOTFS_LABEL="cirros-rootfs"

. /lib/cirros/shlib

mkdir -p /proc /newroot /dev /tmp

mount -t devtmpfs /dev /dev
mount -t proc /proc /proc

echo "6 4 1 7" >/proc/sys/kernel/printk

parse_cmdline

for x in $KC_CONSOLES; do
	[ "$x" = "$KC_CONSOLE" ] ||
		echo "further output written to $KC_CONSOLE" > "$x";
done
if [ -n "$KC_PREF_CONSOLE" ]; then
	exec >"$KC_PREF_CONSOLE" 2>&1 <"$KC_PREF_CONSOLE"
fi

read uptime cputime < /proc/uptime
iinfo "initramfs: up at $uptime"

idebug "loading modules"
/etc/init.d/load-modules start

ROOT=""
MOUNTED=""

if [ "$KC_RAMDISK_ROOT" != "1" ]; then
	while read maj min blk name other; do
		[ -n "${maj}" -a "${maj}" != "major" ] || continue
		umount=0
		mount -o ro "/dev/${name}" "/newroot" >/dev/null 2>&1 &&
			MOUNTED="$MOUNTED ${name}" && umount=1 &&
			[ -x /newroot/sbin/init ] && ROOT="/dev/$name" && break
		[ ${umount} -eq 0 ] || umount /newroot
	done < /proc/partitions
fi

if [ "$KC_DEBUG" = "1" ]; then
	echo "dropping into initramfs debug shell"
	/bin/sh
fi

if [ -z "$ROOT" -a "$KC_RAMDISK_ROOT" != "1" ] &&
   blank=$(blkid -l -o device -t LABEL=$ROOTFS_LABEL) &&
   [ -e "$blank" ]; then
	iinfo "copying initramfs to $blank"
	items=""
	set +f
	for x in /*; do
		case "$x" in
			/dev|/proc|/newroot) : ;;
			*) items="$items $x";;
		esac
	done
	set -f
	mount "$blank" /newroot
	mkdir -p /newroot/dev /newroot/proc
	cp -a $items /newroot/
	cp -a /dev/console /newroot/dev
	mount -o remount,ro /newroot
	ROOT="$blank"
fi

if [ -n "$ROOT" ]; then
	cd /newroot
	mount -o move /dev ./dev
	umount /proc
	iinfo "initramfs loading root from $ROOT"
	exec switch_root /newroot "$KC_INIT" "$@"
else
	while read maj min blk name other; do
		[ -n "${maj}" -a "${maj}" != "major" ] || continue
		umount=0
		mount -o ro "/dev/${name}" "/newroot" >/dev/null 2>&1 &&
			umount=1 &&
			[ -x /newroot/sbin/init ] && ROOT="/dev/$name" && break
		[ ${umount} -eq 0 ] || umount /newroot
	done < /proc/partitions
	umount /proc
	[ "$KC_RAMDISK_ROOT" = "0" ] &&
		iinfo "initramfs did not find root, running as ramdisk" ||
		iinfo "running in ramdisk mode as requested"
	exec "$KC_INIT" "$@"
fi
failure "badness occurred in ramdisk"