Fix turn file link (#5601)

* debian: Does not add a link of turnserver will not be configured. Fixes #5596.

* debian: Partially reverts 990c77bd.

* debian: Skip filename duplication, use variable.

debian/jitsi-meet-turnserver.links

-/usr/share/jitsi-meet-turnserver/jitsi-meet.conf /etc/nginx/modules-enabled/60-jitsi-meet.conf

debian/jitsi-meet-turnserver.postinst

             # check whether other enabled hosts has listen 443
             if cat ${site} | grep -v "^[[:space:]]*#" | grep listen | grep -q "^.*[[:space:]:]443[;[:space:]].*" ; then
                 # nothing to do
+                echo "------------------------------------------------"
                 echo ""
                 echo "turnserver not configured as other nginx sites use port 443"
                 echo ""
+                echo "------------------------------------------------"
                 db_stop
                 exit 0
             fi
         done
 
+        # if there was a turn config backup it so we can configure
+        # we cannot recognize at the moment is this a user config or default config when installing coturn
+        if [[ -f $TURN_CONFIG ]] && ! grep -q "jitsi-meet coturn config" "$TURN_CONFIG" ; then
+            mv $TURN_CONFIG $TURN_CONFIG.bak
+        fi
+
         # detect dpkg-reconfigure, just delete old links
         db_get jitsi-meet-turnserver/jvb-hostname
         JVB_HOSTNAME_OLD=$RET
         db_get jitsi-meet/jvb-serve || true
         if [ ! -f $NGINX_CONFIG -o "$RET" = "true" ] ; then
             # nothing to do
+            echo "------------------------------------------------"
             echo ""
             echo "turnserver not configured as no nginx found to multiplex traffic"
             echo ""
+            echo "------------------------------------------------"
             db_stop
             exit 0
         fi
 
         if [[ -f $TURN_CONFIG ]] ; then
+            echo "------------------------------------------------"
             echo ""
             echo "turnserver is already configured on this machine, skipping."
             echo ""
+            echo "------------------------------------------------"
             db_stop
             exit 0
         fi
         invoke-rc.d coturn restart || true
 
         NGINX_STREAM_CONFIG="/etc/nginx/modules-enabled/60-jitsi-meet.conf"
-        if [ -f $NGINX_STREAM_CONFIG ] && [ -f $NGINX_CONFIG ] ; then
+        if [ ! -f $NGINX_STREAM_CONFIG ] && [ -f $NGINX_CONFIG ] ; then
+            ln -s /usr/share/jitsi-meet-turnserver/jitsi-meet.conf $NGINX_STREAM_CONFIG
             sed -i "s/listen 443 ssl/listen 4444 ssl http2/g" $NGINX_CONFIG
             sed -i "s/listen \[\:\:\]\:443 ssl/listen \[\:\:\]\:4444 ssl http2/g" $NGINX_CONFIG
             invoke-rc.d nginx reload || true

debian/jitsi-meet-turnserver.postrm

 
 case "$1" in
     remove)
+        rm -rf /etc/nginx/modules-enabled/60-jitsi-meet.conf
         if [ -x "/etc/init.d/nginx" ]; then
             invoke-rc.d nginx reload || true
         fi
         fi
     ;;
     purge)
+        rm -rf /etc/nginx/modules-enabled/60-jitsi-meet.conf
+        rm -rf /etc/turnserver.conf
         if [ -x "/etc/init.d/nginx" ]; then
             invoke-rc.d nginx reload || true
         fi