dracut/modules.d/40network/netroot

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#!/bin/sh
. /lib/dracut-lib
getarg rdnetdebug && {
exec >/tmp/netroot.$1.$$.out
exec 2>>/tmp/netroot.$1.$$.out
set -x
}
# Huh? Empty $1?
[ -z "$1" ] && exit 1
# Huh? No interface config?
[ ! -e /tmp/net.$1.up ] && exit 1
# Only try to configure from one network interface at a time
#
[ "$NETROOT_LOCKED" ] || {
NETROOT_LOCKED=true
export NETROOT_LOCKED
exec flock -xo /tmp/netroot.lock -c "$0 $*"
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
netif=$1
[ -e /tmp/dhclient.$netif.dhcpopts ] && . /tmp/dhclient.$netif.dhcpopts
# Now, let the installed network root handlers figure this out
#
source_all netroot
# If we didn't get a handler set, then we're done
#
if [ -z "$handler" ]; then
# XXX informative error message?
exit 0
fi
# Run the handler; don't store the root, it may change from device to device
# XXX other variables to export?
if $handler $netif $netroot $NEWROOT; then
# Network rootfs mount successful
[ -f /tmp/dhclient.$netif.lease ] && cp /tmp/dhclient.$netif.lease /tmp/net.$netif.lease
[ -f /tmp/dhclient.$netif.dhcpopts ] && cp /tmp/dhclient.$netif.dhcpopts /tmp/net.$netif.dhcpopts
[ -f /tmp/dhclient.$netif.override ] && cp /tmp/dhclient.$netif.override /tmp/net.$netif.override
# Save used netif for later use
echo $netif > /tmp/net.bootdev
fi
exit 0