debian: Skip turnserver config if it is already configured.

debian/jitsi-meet-turnserver.postinst

@@ -40,8 +40,10 @@ case "$1" in
         db_get jitsi-meet-turnserver/jvb-hostname
         JVB_HOSTNAME_OLD=$RET
         if [ -n "$RET" ] && [ ! "$JVB_HOSTNAME_OLD" = "$JVB_HOSTNAME" ] ; then
+            if [[ -f $TURN_CONFIG ]] && grep -q "jitsi-meet coturn config" "$TURN_CONFIG" ; then
                 rm -f $TURN_CONFIG
             fi
+        fi
 
         # this detect only old installations with no nginx
         db_get jitsi-meet/jvb-serve || true
@@ -54,6 +56,14 @@ case "$1" in
             exit 0
         fi
 
+        if [[ -f $TURN_CONFIG ]] ; then
+            echo ""
+            echo "turnserver is already configured on this machine, skipping."
+            echo ""
+            db_stop
+            exit 0
+        fi
+
         # stores the hostname so we will reuse it later, like in purge
         db_set jitsi-meet-turnserver/jvb-hostname "$JVB_HOSTNAME"
 
@@ -65,7 +75,7 @@ case "$1" in
         fi
         TURN_SECRET="$RET"
 
-        if [[ -f $TURN_CONFIG ]] && ! grep -q "jitsi-meet coturn config" "$TURN_CONFIG" ; then
+        # no turn config exists, lt's copy template and fill it in
         PUBLIC_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)
         cp /usr/share/jitsi-meet-turnserver/turnserver.conf $TURN_CONFIG
         sed -i "s/jitsi-meet.example.com/$JVB_HOSTNAME/g" $TURN_CONFIG
@@ -105,7 +115,6 @@ case "$1" in
         if [ -f $JITSI_MEET_CONFIG ] ; then
             sed -i "s/\/\/ useStunTurn: true/useStunTurn: true/g" $JITSI_MEET_CONFIG
         fi
-        fi
 
         # and we're done with debconf
         db_stop