# NFS filesystem mounting			-*- shell-script -*-

# NBD root mounting
mountroot()
{
	[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/nfs-top"
	run_scripts /scripts/nfs-top
	[ "$quiet" != "y" ] && log_end_msg

	# For DHCP
	modprobe -q af_packet

	case ${IPOPTS} in
		none|off)
			# Do nothing
			;;
		""|on|any)
			# Bring up device
			ipconfig ${DEVICE}
			;;
		dhcp|bootp|rarp|both)
			ipconfig -c ${IPOPTS} -d ${DEVICE}
			;;
		*)
			ipconfig -d $IPOPTS

			# grab device entry from ip option
			NEW_DEVICE=${IPOPTS#*:*:*:*:*:*}
			if [ "${NEW_DEVICE}" != "${IPOPTS}" ]; then
				NEW_DEVICE=${NEW_DEVICE%:*}
			else
				# wrong parse, possibly only a partial string
				NEW_DEVICE=
			fi
			if [ -n "${NEW_DEVICE}" ]; then
				DEVICE="${NEW_DEVICE}"
			fi
			;;
	esac

	# source relevant ipconfig output
	. /tmp/net-${DEVICE}.conf

    if [ -n "${nbdroot}" ]; then
               NBD_ROOT_SERVER=$( echo "${nbdroot}" | sed 's/:.*//')
               NBD_ROOT_PORT=$( echo "${nbdroot}" | sed 's/.*://')
       else
               NBD_ROOT_SERVER="${ROOTSERVER}"
               NBD_ROOT_PORT=${nbdport:-"2000"}
       fi
       if [ -n "${nbdswap}" ]; then
               NBD_SWAP_SERVER=$( echo "${nbdswap}" | sed 's/:.*//')
               NBD_SWAP_PORT=$( echo "${nbdswap}" | sed 's/.*://')
       else
               NBD_SWAP_SERVER="${ROOTSERVER}"
               NBD_SWAP_PORT=${nbdswapport:-"9572"}
    fi

    # try to get swap from the server if we dont have enough ram (less than 48M)
    min_ram=49152
    real_ram=$(cat /proc/meminfo |grep MemTotal|tr -d " [a-z][A-Z]:")

    if [ ${real_ram} -lt ${min_ram} ];then
        [ "$quiet" != "y" ] && log_begin_msg "Only found ${real_ram}k main ram, trying network swap."
        nbd-client ${NBD_SWAP_SERVER} ${NBD_SWAP_PORT} /dev/nbd1 || true
        mkswap /dev/nbd1 || true
        swapon /dev/nbd1 || true
        [ "$quiet" != "y" ] && log_end_msg
    fi

    mkdir -p /cow
    mkdir -p /rofs

    # create tmpfs for writeable files
    mount -t tmpfs tmpfs /cow

    # mount the readonly root
    nbd-client ${NBD_ROOT_SERVER} ${NBD_ROOT_PORT} /dev/nbd0 && mount -o ro -t squashfs /dev/nbd0 /rofs

    # merge ro and rw filesystems
    mount -t unionfs -o dirs=/cow=rw:/rofs=ro unionfs ${rootmnt}

    # make the filesystems accessible
    mkdir -p ${rootmnt}/cow
    mount -o bind /cow ${rootmnt}/cow

    mkdir -p ${rootmnt}/rofs
    mount -o move /rofs ${rootmnt}/rofs

    # get the lts.conf via tftp
    tftpath=$(echo ${filename%/*}|tr -d '"')
    (echo "get ${tftpath}/lts.conf"|tftp ${ROOTSERVER} >/dev/null 2>&1)
    if [ -s ./lts.conf ];then
        cp ./lts.conf ${rootmnt}/etc/
    fi

	[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/nfs-bottom"
	run_scripts /scripts/nfs-bottom
	[ "$quiet" != "y" ] && log_end_msg
}