/usr/lib/dracut/modules.d/40network/dhcp-root.sh is in dracut-network 040+1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #!/bin/sh
# This script is sourced, so root should be set. But let's be paranoid
[ -z "$root" ] && root=$(getarg root=)
if [ -z "$netroot" ]; then
for netroot in $(getargs netroot=); do
[ "$netroot" = "dhcp" ] && break
[ "$netroot" = "dhcp6" ] && break
done
[ "$netroot" = "dhcp" ] || [ "$netroot" = "dhcp6" ] || unset netroot
fi
if [ "$root" = "dhcp" ] || [ "$root" = "dhcp6" ] || [ "$netroot" = "dhcp" ] || [ "$netroot" = "dhcp6" ]; then
# Tell ip= checker that we need dhcp
NEEDDHCP="1"
# Done, all good!
rootok=1
if [ "$netroot" != "dhcp" ] && [ "$netroot" != "dhcp6" ]; then
netroot=$root
fi
# Shut up init error check
[ -z "$root" ] && root="dhcp"
echo '[ -d $NEWROOT/proc -o -e /dev/root ]' > $hookdir/initqueue/finished/dhcp.sh
fi
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