Introduce an additional lighttpd config file to redirect the IP address and VIRTUAL_HOST to /admin/

Signed-off-by: Adam Warner <me@adamwarner.co.uk>

src/Dockerfile

@@ -34,6 +34,7 @@ ENV S6_BEHAVIOUR_IF_STAGE2_FAILS 2
 ENV S6_CMD_WAIT_FOR_SERVICES_MAXTIME 0
 
 ENV FTLCONF_LOCAL_IPV4 0.0.0.0
+ENV VIRTUAL_HOST ""
 ENV FTL_CMD no-daemon
 ENV DNSMASQ_USER pihole
 

src/s6/debian-root/etc/lighttpd/conf-enabled/15-pihole-admin-redirect-docker.conf

@@ -0,0 +1,8 @@
+$HTTP["url"] == "/" {
+    $HTTP["host"] == env.VIRTUAL_HOST {
+         url.redirect = ("" => "/admin/")
+    }
+    $HTTP["host"] == env.FTLCONF_LOCAL_IPV4 {
+         url.redirect = ("" => "/admin/")
+    }
+}

src/s6/debian-root/usr/local/bin/bash_functions.sh

@@ -348,9 +348,10 @@ setup_lighttpd_bind() {
 }
 
 setup_web_php_env() {
-    if [ -z "$VIRTUAL_HOST" ] ; then
-      VIRTUAL_HOST="$FTLCONF_LOCAL_IPV4"
-    fi;
+    # if the environment variable VIRTUAL_HOST is not set, or is empty, then set it to the IP address of the container
+    if [ -z "${VIRTUAL_HOST}" ] || [ "${VIRTUAL_HOST}" == "" ]; then
+        VIRTUAL_HOST="${FTLCONF_LOCAL_IPV4}"
+    fi
 
     for config_var in "VIRTUAL_HOST" "CORS_HOSTS" "PHP_ERROR_LOG" "PIHOLE_DOCKER_TAG" "TZ"; do
       local beginning_of_line="                    \"${config_var}\" => "