dracut/modules.d/40network/dhcp-root.sh

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#!/bin/sh
# Don't continue if root is ok
[ -n "$rootok" ] && return
# This script is sourced, so root should be set. But let's be paranoid
[ -z "$root" ] && root=$(getarg root=)
[ -z "$netroot" ] && netroot=$(getarg netroot=)
if [ "$root" = "dhcp" ] || [ "$netroot" = "dhcp" ] ; then
# Tell ip= checker that we need dhcp
NEEDDHCP="1"
# Done, all good!
rootok=1
netroot=dhcp
# Shut up init error check
[ -z "$root" ] && root="dhcp"
fi