dracut/modules.d/40network/ifup

#!/bin/sh

# loopback is always handled the same way
[ "$1" = "lo" ] && {
    ip link set lo up
    ip addr add 127.0.0.1/8 dev lo
    exit 0
}

# spin through the kernel command line, looking for ip= lines
for p in $(cat /proc/cmdline); do
    [ "${p%ip=*}" ] || continue
    p=${p#ip=}
    case $p in
	none|off) exit 0;; # we were told to not configure anything
	dhcp|on|any) >/net.$1.dhcp; exit 0;; 
	bootp|rarp|both) exit 0;; #dunno how to do this
	*) echo ${ip#ip=} | \
	    (IFS=':' read client server gw netmask hostname device autoconf
		if [ -z "$device" -o "$device" = "$1"  ]; then
		    case $autoconf in
			dhcp|on|any) >/net.$1.dhcp ;;
			none|off|'') # do some basic configuration
			    ip link set $1 up
			    ip addr add $client/$netmask dev $1
			    [ "$gw" ] && ip route add default via $gw dev $1
			    >/net.$1.up ;;
		    esac
		fi
		) ;;
	*) continue;;
    esac
done