#!/bin/sh

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#

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# Preferred format:

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# root=nbd:srv:port/exportname[:fstype[:rootflags[:nbdopts]]]

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# [root=*] netroot=nbd:srv:port/exportname[:fstype[:rootflags[:nbdopts]]]

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#

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# nbdopts is a comma separated list of options to give to nbd-client

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#

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# root= takes precedence over netroot= if root=nbd[...]

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#

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# Sadly there's no easy way to split ':' separated lines into variables

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netroot_to_var() {

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local v=${1}:

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set --

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while [ -n "$v" ]; do

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set -- "$@" "${v%%:*}"

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v=${v#*:}

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done

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unset server port

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server=$2; port=$3;

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}

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# This script is sourced, so root should be set. But let's be paranoid

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[ -z "$root" ] && root=$(getarg root=)

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if [ -z "$netroot" ]; then

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for netroot in $(getargs netroot=); do

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[ "${netroot%%:*}" = "nbd" ] && break

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done

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[ "${netroot%%:*}" = "nbd" ] || unset netroot

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fi

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# Root takes precedence over netroot

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if [ "${root%%:*}" = "nbd" ] ; then

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if [ -n "$netroot" ] ; then

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warn "root takes precedence over netroot. Ignoring netroot"

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fi

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netroot=$root

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unset root

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fi

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# If it's not nbd we don't continue

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[ "${netroot%%:*}" = "nbd" ] || return

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if [ -n "${DRACUT_SYSTEMD}" ] && [ "$root" = "dhcp" ]; then

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echo "root=$netroot" > /etc/cmdline.d/root.conf

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systemctl --no-block daemon-reload

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fi

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# Check required arguments

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netroot_to_var $netroot

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[ -z "$server" ] && die "Argument server for nbdroot is missing"

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[ -z "$port" ] && die "Argument port for nbdroot is missing"

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# NBD actually supported?

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incol2 /proc/devices nbd || modprobe nbd || die "nbdroot requested but kernel/initrd does not support nbd"

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# Done, all good!

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rootok=1

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# Shut up init error check

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if [ -z "$root" ]; then

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root=block:/dev/root

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wait_for_dev -n /dev/root

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fi

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