#!/bin/sh
#
# Maximilian Wilhelm <max@rfc2324.org>
#  --  Thu 07 Jul 2016 03:28:44 PM CEST
#
# Make sure that the correct B.A.T.M.A.N version is installed on this machine,
# reconfigure batman interfaces and restart services depending on batman (alfred
# and fastd). Beware that this restarts ALL fastd instances. As we are only using
# fastd for batman'ish things currently, that's fine.
#

batman_version_wanted="2013.4.0"

# Bail on error
set -e

only_fix_module=false
if [ "$1" = "--only-fix-module" ]; then
	only_fix_module=true
fi
export only_fix_module

batman_version_installed=$(modinfo batman-adv | awk -F: '/^version:/ { print $2 }' | tr -d '[:space:]')
my_name="ff_fix_batman"
logfile="/var/log/ff_fix_batman-$(date +%Y.%m.%d-%H:%M).log"

if [ "${batman_version_wanted}" = "${batman_version_installed}" ]; then
	msg="Version ${batman_version_wanted} of batman-adv already installed."
	echo ${msg}
	logger -t "${my_name}" "${msg}"
	exit 0
fi

msg="Version ${batman_version_wanted} of batman-adv wanted, but ${batman_version_installed} found. Fixing, see ${logfile} for details."
echo "${msg}"
logger -t "${my_name}" "${msg}"

(

# Be safe and shutdown all batman interfaces before removing the module
for iface in $(ip l | awk -F: '/^[0-9]/ { print $2 }' | tr -d ' ' | grep ^bat); do
	ifdown "${iface}" || true
done

if lsmod | grep batman-adv; then
	rmmod batman-adv
fi

dkms remove  "batman-adv/${batman_version_wanted}" --all || true
dkms install "batman-adv/${batman_version_wanted}" --force

# Load the newly compiled B.A.T.M.A.N. module
modprobe batman-adv

if [ ! "${only_fix_module}" ]; then
	# Configure all B.A.T.M.A.N. broken before
	ifup -a
	
	# Restart fastd, if installed
	if dpkg -l fastd >/dev/null 2>/dev/null; then
		service fastd restart
	fi
	
	# Restart alfred, if installed
	if dpkg -l alfred >/dev/null 2>/dev/null; then
		service alfred restart
	fi
fi

) >>"${logfile}" 2>>"${logfile}"