#!/bin/bash

# This script will:
# 1. stop homeassistant if it is running (wait/kill it if it fails to stop)
# 2. backs up /opt/homeassistant (moves it to: /opt/homeassistant-OLD_VERSION)
# 3. merges the new version of homeassistant
# 4. re-starts homeassistant if the merge was successful

prog="homeassistant"
atom="app-misc/${prog}-bin"

if [ -f /etc/init.d/${prog} ] ; then
    if /etc/init.d/${prog} --ifstarted stop ; then
	echo "${prog} stopped"
    else
	echo "failed to stop, sleeping/killing: ${prog}"
	sleep 20
	pkill -9 -f "/opt/${prog}/bin/python3"
	/etc/init.d/${prog} zap
    fi
fi

installed_version()
{
    equery --no-color list -F '$fullversion' "${atom}" | tail -1
}

rollback_info()
{
    if [ -d "/opt/${prog}-v${version}" ] ; then
	echo "rollback by: mv /opt/${prog}-v${version} /opt/${prog}"
    fi
}

version=$(installed_version)

if [ -d "/opt/${prog}" ] ; then
    if [ ! -d "/opt/${prog}-v${version}" ] ; then
	echo "backing up previous version as v${version}"
	mv "/opt/${prog}" "/opt/${prog}-v${version}"
	rollback_info
    else
	echo "Previous backup found - (re-)move it manually and run the script again"
	exit 2
    fi
fi

echo "The portage network-sandbox will be temporally disabled to install ${atom}"
read -t 5 -p "Hit Control-C within 5 seconds to abort this install..."

if FEATURES="-network-sandbox" emerge -v1 "${atom}" ; then
    echo "${atom} $(installed_version) merge successful"
    /etc/init.d/${prog} --ifstopped start
    echo "now check the logs in /var/log/${prog}; e.g."
    echo "  tail -f /var/log/${prog}/server.log"
    rollback_info
    exit 0
else
    echo "${atom} merge failed"
    rollback_info
    exit 1
fi