Install tor daemon from backports

src/freedombone-app-xmpp

 # License
 # =======
 #
-# Copyright (C) 2014-2017 Bob Mottram <bob@freedombone.net>
+# Copyright (C) 2014-2018 Bob Mottram <bob@freedombone.net>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Affero General Public License as published by

src/freedombone-image-customise

     chroot "$rootdir" apt-get -yq install apt-transport-https
 
     # install tor as a possible way of routing traffic between internet gateways
-    chroot "$rootdir" apt-get -yq install tor
+    chroot "$rootdir" apt-get -yq -t stretch-backports install tor
 
     # dhcp daemon for hotspot on secondary wifi adapter
     chroot "$rootdir" apt-get -yq install dnsmasq

src/freedombone-upgrade

         email_install_tls
         email_disable_chunking
         #defrag_filesystem
+
+        # reinstall tor from backports
+        tor_version=$(tor --version)
+        if [[ "$tor_version" == *' 0.2'* ]]; then
+            apt-get -yq -t stretch-backports install tor
+        fi
     fi
 fi
 

src/freedombone-utils-onion

         return
     fi
 
-    apt-get -yq install tor
+    apt-get -yq -t stretch-backports install tor
     if [ ! -f /etc/tor/torrc ]; then
         echo 'Tor failed to install'
         exit 38259