#!/bin/bash -eu

# This is the install script for radvd when run in a privileged
# container.
#
# The host file system must be mounted at /host

cd /
PATH="/usr/bin:/usr/sbin"
MISSING_PACKAGES=0
: "${HOST:=/host}"
: "${ORIGIN:=}"

QUADLET_DIR="$HOST/etc/containers/systemd"
QUADLET_FILENAME="radvd.container"

if [ ! -d $HOST/etc ] || [ ! -d $HOST/proc ] || [ ! -d $HOST/run ]; then
    echo "radvd-install: host file system is not mounted at $HOST"
    exit 1
fi

if test ! -w "/host/etc"; then
	echo "radvd-install: this container cannot be installed by a non-root user."
	exit 1
fi

installed=false
if test ! -e "/host/etc/radvd.conf"; then
	random() {
		od -An -d -N2 /dev/urandom
	}

	prefix=`printf "fd%%02x:%%04x:%%04x:0001::/64\n" $(($(random) %% 256)) $(random) $(random)`
	sed -e "s,prefix (fd.*/64),prefix $prefix," $ORGIN/etc/radvd.conf > $HOST/etc/radvd.conf
	echo "radvd-install: created /etc/radvd.conf with ULA prefix $prefix"

	installed=true
fi

if test ! -e "$QUADLET_DIR/$QUADLET_FILENAME"; then
	mkdir -p "$QUADLET_DIR"
	sed -e "s,%IMAGE%,%{IMAGE},g" "$ORIGIN/container/quadlet/${QUADLET_FILENAME}.in" \
							> "$QUADLET_DIR/${QUADLET_FILENAME}"
	echo "radvd-install: installed $QUADLET_FILENAME quadlet"
	chroot "$HOST" systemctl daemon-reload
	installed=true
fi

if test "$installed" = "true"; then
	echo radvd container installed, to start it:
else
	echo radvd container was already installed, to start it
fi

echo systemctl enable --now radvd