Does not override prosody config on update.

debian/jitsi-meet-prosody.postinst

 
         . /etc/default/jitsi-videobridge
 
-        if [ -f /etc/prosody/prosody.cfg.lua ]; then
-            mv /etc/prosody/prosody.cfg.lua /etc/prosody/prosody.cfg.lua.orig
+        PROSODY_CONFIG_PRESENT="true"
+        if [ ! -f /etc/prosody/prosody.cfg.lua ]; then
+            PROSODY_CONFIG_PRESENT="false"
+            gunzip -c /usr/share/doc/jitsi-meet-prosody/prosody.cfg.lua-jvb.example.gz > /etc/prosody/prosody.cfg.lua
         fi
-        gunzip -c /usr/share/doc/jitsi-meet-prosody/prosody.cfg.lua-jvb.example.gz > /etc/prosody/prosody.cfg.lua
-        sed -i "s/jitmeet.example.com/$JVB_HOSTNAME/g" /etc/prosody/prosody.cfg.lua
-        sed -i "s/jitmeetSecret/$JVB_SECRET/g" /etc/prosody/prosody.cfg.lua
+
+        if [ ! grep "VirtualHost \"$JVB_HOSTNAME\"" /etc/prosody/prosody.cfg.lua > /dev/null ]; then
+            if [ "PROSODY_CONFIG_PRESENT" = "true" ]; then
+                mv /etc/prosody/prosody.cfg.lua /etc/prosody/prosody.cfg.lua.orig
+            fi
+            sed -i "s/jitmeet.example.com/$JVB_HOSTNAME/g" /etc/prosody/prosody.cfg.lua
+            sed -i "s/jitmeetSecret/$JVB_SECRET/g" /etc/prosody/prosody.cfg.lua
+        fi
+
         if [ ! -f /var/lib/prosody/$JVB_HOSTNAME.crt ]; then
             HOST="$( (hostname -s; echo localhost) | head -n 1)"
             DOMAIN="$( (hostname -d; echo localdomain) | head -n 1)"

debian/jitsi-meet.postinst

         chown -R www-data:www-data /usr/share/jitsi-meet/
         sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" /usr/share/jitsi-meet/config.js
         # enable turn
-        if grep "//  useStunTurn: true," /usr/share/jitsi-meet/config.js > /dev/null; then
-            sed -i "s/\/\/\ \ useStunTurn:\ true,/\ \ \ \ useStunTurn:\ true,/" /usr/share/jitsi-meet/config.js
-        fi
+        #if grep "//  useStunTurn: true," /usr/share/jitsi-meet/config.js > /dev/null; then
+        #    sed -i "s/\/\/\ \ useStunTurn:\ true,/\ \ \ \ useStunTurn:\ true,/" /usr/share/jitsi-meet/config.js
+        #fi
         invoke-rc.d nginx restart
 
     ;;