Simplify update of dynamic dns

src/freedombone

 DDNS_PROVIDER="default@freedns.afraid.org"
 DDNS_USERNAME=
 DDNS_PASSWORD=
-CURRENT_DDNS_DOMAIN=
 
 EXIM_ONION_REPO="https://github.com/petterreinholdtsen/exim4-smtorp"
 
 }
 
 function add_ddns_domain {
-    if [[ $ONION_ONLY != "no" ]]; then
-        return
-    fi
-    if [ ! $CURRENT_DDNS_DOMAIN ]; then
+    if [ ! $1 ]; then
         echo $'ddns domain not specified'
         exit 5638
     fi
+    CURRENT_DDNS_DOMAIN="$1"
+    if [[ $ONION_ONLY != "no" ]]; then
+        return
+    fi
     if [ ! -f /etc/inadyn.conf ]; then
         echo $'Unable to find inadyn configuration file /etc/inadyn.conf'
         exit 5745
     chmod 600 /etc/inadyn.conf
     systemctl restart inadyn
     systemctl daemon-reload
-
-    # clear the arguments
-    CURRENT_DDNS_DOMAIN=
 }
 
 function upgrade_owncloud_start {
         echo "Owncloud onion domain:${OWNCLOUD_ONION_HOSTNAME}" >> $COMPLETION_FILE
     fi
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$OWNCLOUD_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $OWNCLOUD_DOMAIN_NAME
 
     if ! grep -q "Owncloud domain" $COMPLETION_FILE; then
         echo "Owncloud domain:$OWNCLOUD_DOMAIN_NAME" >> $COMPLETION_FILE
         echo "Gogs onion domain:${GIT_ONION_HOSTNAME}" >> $COMPLETION_FILE
     fi
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$GIT_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $GIT_DOMAIN_NAME
 
     echo "Gogs domain:$GIT_DOMAIN_NAME" >> $COMPLETION_FILE
     echo 'install_gogs' >> $COMPLETION_FILE
 
     echo "Wiki onion domain:${WIKI_ONION_HOSTNAME}" >> $COMPLETION_FILE
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$WIKI_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $WIKI_DOMAIN_NAME
 
     # add some post-install instructions
     if ! grep -q $"Wiki password" /home/$MY_USERNAME/README; then
     fi
     echo "Blog onion domain:${FULLBLOG_ONION_HOSTNAME}" >> $COMPLETION_FILE
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$FULLBLOG_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $FULLBLOG_DOMAIN_NAME
 
     echo 'install_blog' >> $COMPLETION_FILE
 }
     fi
     newaliases
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$MICROBLOG_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $MICROBLOG_DOMAIN_NAME
 
     microblog_nginx_site=/etc/nginx/sites-available/$MICROBLOG_DOMAIN_NAME
     if [[ $ONION_ONLY == "no" ]]; then
         echo "12,22,32,42,52 * *   *   *   root cd $HUBZILLA_PATH; /usr/bin/timeout 500 /usr/bin/php include/poller.php" >> /etc/crontab
     fi
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$HUBZILLA_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $HUBZILLA_DOMAIN_NAME
 
     if [[ $ONION_ONLY == "no" ]]; then
         nginx_http_redirect $HUBZILLA_DOMAIN_NAME
     systemctl restart php5-fpm
     systemctl restart nginx
 
-    # update the dynamic DNS
-    CURRENT_DDNS_DOMAIN=$MEDIAGOBLIN_DOMAIN_NAME
-    add_ddns_domain
+    add_ddns_domain $MEDIAGOBLIN_DOMAIN_NAME
 
     echo 'install_mediagoblin' >> $COMPLETION_FILE
 }