new: dev: [apache] support when called out from a relation.

This is to support ``ssh-tunnel`` that will be called from ``init``.

apache/lib/common

@@ -56,7 +56,9 @@ apache_vhost_create() {
         protocols=$(__vhost_cfg_normalize_protocol "$cfg") || return 1
     fi
 
-    domain=$(get_domain "$cfg") && relation-set domain "$domain"
+    domain=$(get_domain "$cfg") && {
+        [ "$RELATION_DATA_FILE" ] && relation-set domain "$domain"
+    }
 
     if is_protocol_enabled https "$protocols"; then
         if [ -z "$domain" ]; then
@@ -80,6 +82,7 @@ apache_vhost_create() {
   RewriteCond %{HTTPS} off
   RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [R=302,L,QSA]
 "
+                [ "$RELATION_DATA_FILE" ] && \
                     relation-set apache-custom-rules "$redirect_rule
 $(if [ "$custom_rules" ]; then
     echo "- |"$'\n'"$(echo "$custom_rules" | prefix "  ")"
@@ -89,13 +92,16 @@ $(if [ "$custom_rules" ]; then
     echo "- |"$'\n'"$(echo "$custom_rules" | prefix "  ")"
   fi)")")
             fi
+            [ "$RELATION_DATA_FILE" ] && \
                 relation-set protocol https
         else
             ## Both services are available and different, don't do anything then ?
-            #relation-set protocol https
+            #[ "$RELATION_DATA_FILE" ] && \
+            #    relation-set protocol https
             :
         fi
     else
+        [ "$RELATION_DATA_FILE" ] && \
             relation-set protocol http
     fi
     vhost_statement=$(apache_vhost_statement "$type" "$protocols" "$cfg" "$domain") || {

apache/test/vhost_cert_provider

@@ -24,6 +24,7 @@ relation-get() {
 }
 export -f relation-get
 
+export RELATION_DATA_FILE=x
 relation-set() {
     local key="$1" value="$2"
     echo "relation-set $key:" >&2

apache/test/vhost_files

@@ -22,6 +22,7 @@ relation-get() {
 }
 export -f relation-get
 
+export RELATION_DATA_FILE=x
 relation-set() {
     local key="$1" value="$2"
     echo "relation-set $key:" >&2