#!/bin/sh

PATH=$PATH:/sbin:/usr/sbin

. /lib/dracut-lib.sh

# Huh? Empty $1?
[ -z "$1" ] && exit 1

# Huh? No interface config?
[ ! -e /tmp/net.$1.up ] && exit 1

# There's no sense in doing something if no (net)root info is available
# or root is already there
[ -e /tmp/root.info ] || exit 1
. /tmp/root.info
[ -d $NEWROOT/proc ] && exit 0
[ -z "$netroot" ] && exit 1

# Let's see if we have to wait for other interfaces
# Note: exit works just fine, since the last interface to be 
#       online'd should see all files
[ -e "/tmp/net.ifaces" ] && read IFACES < /tmp/net.ifaces
for iface in $IFACES ; do
    [ -e /tmp/net.$iface.up ] || exit 1
done

# Set or override primary interface 
netif=$1
[ -e "/tmp/net.bootdev" ] && read netif < /tmp/net.bootdev

# Figure out the handler for root=dhcp by recalling all netroot cmdline 
# handlers
if [ "$netroot" = "dhcp" ] || [ "$netroot" = "dhcp6" ] ; then
    # Unset root so we can check later
    unset root

    # Load dhcp options
    [ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts

    # If we have a specific bootdev with no dhcpoptions or empty root-path, 
    # we die. Otherwise we just warn
    if [ -z "$new_root_path" ] ; then
	[ -n "$BOOTDEV" ] && die "No dhcp root-path received for '$BOOTDEV'"
	warn "No dhcp root-path received for '$BOOTDEV' trying other interfaces if available"
	exit 1
    fi

    # Set netroot to new_root_path, so cmdline parsers don't call
    netroot=$new_root_path

    for f in ./cmdline/90*.sh; do
	[ -f "$f" ] && . "$f";
    done
else 
    rootok="1"
fi

# Check: do we really know how to handle (net)root?
[ -z "$root" ] && die "No or empty root= argument"
[ -z "$rootok" ] && die "Don't know how to handle 'root=$root'"

handler=${netroot%%:*}
handler=${handler%%4}
handler="/sbin/${handler}root"
if [ -z "$netroot" ] || [ ! -e "$handler" ] ; then
    die "No handler for netroot type '$netroot'"
fi

# We're here, so we can assume that upping interfaces is now ok
[ -z "$IFACES" ] && IFACES="$netif"
for iface in $IFACES ; do
    . /tmp/net.$iface.up
done

[ -e /tmp/net.$netif.gw ]          && . /tmp/net.$netif.gw
[ -e /tmp/net.$netif.hostname ]    && . /tmp/net.$netif.hostname
[ -e /tmp/net.$netif.resolv.conf ] && cp -f /tmp/net.$netif.resolv.conf /etc/resolv.conf

# Load interface options
[ -e /tmp/net.$netif.override ] && . /tmp/net.$netif.override
[ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts

# Handle STP Timeout: arping default router or if not available the
# root server. Note: This assumes that if no router is present the
# root server is on the same subnet.
#
# TODO There's some netroot variants that don't (yet) have their 
# server-ip netroot
[ -n "$new_routers" ] && dest=${new_routers%%,*}
[ -n "$gw" ] && dest=$gw
if [ -z "$dest" ] ; then
    dummy=${netroot#*:}
    dummy=${dummy%%:*}
    case "$dummy" in
       [0-9]*\.[0-9]*\.[0-9]*\.[0-9]*) dest=$dummy;;
    esac
fi
if [ -n "$dest" ] && ! arping -q -f -w 60 -I $netif $dest ; then
    die "Resolving $dest via ARP on $netif failed"
fi

# Source netroot hooks before we start the handler
source_all netroot

# Run the handler; don't store the root, it may change from device to device
# XXX other variables to export?
if $handler $netif $netroot $NEWROOT; then
    # Network rootfs mount successful
    for iface in $IFACES ; do
	[ -f /tmp/dhclient.$iface.lease ] &&    cp /tmp/dhclient.$iface.lease    /tmp/net.$iface.lease
	[ -f /tmp/dhclient.$iface.dhcpopts ] && cp /tmp/dhclient.$iface.dhcpopts /tmp/net.$iface.dhcpopts
    done

    # Save used netif for later use
    [ ! -f /tmp/net.ifaces ] && echo $netif > /tmp/net.ifaces
else 
    warn "Mounting root via '$netif' failed"
    # If we're trying with multiple interfaces, put that one down.
    # ip down/flush ensures that routeing info goes away as well
    if [ -z "$BOOTDEV" ] ; then
	ip link set $netif down
	ip addr flush dev $netif
	echo "#empty" > /etc/resolv.conf
    fi
fi
exit 0