new: [apache] default value for domain name is service name if this one is a domain name.

apache/lib/common

@@ -2,11 +2,22 @@
 
 config_hash=
 
-apache_proxy_dir () {
-    DOMAIN=$(relation-get domain) || {
+
+get_domain () {
+    relation-get domain 2>/dev/null && return 0
+
+    ## is service name a regex ?
+    if [[ "$BASE_SERVICE_NAME" =~ ^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$ ]]; then
+        echo "$BASE_SERVICE_NAME"
+        return 0
+    fi
+
     err "You must specify a ${WHITE}domain$NORMAL option in relation."
     return 1
 }
+
+apache_proxy_dir () {
+    DOMAIN=$(get_domain) || return 1
     proxy=yes apache_vhost_create || return 1
     info "Added $DOMAIN as a proxy to $TARGET."
 }
@@ -14,10 +25,7 @@ export -f apache_proxy_dir
 
 
 apache_publish_dir () {
-    DOMAIN=$(relation-get domain) || {
-        err "You must specify a ${WHITE}domain$NORMAL option in relation."
-        return 1
-    }
+    DOMAIN=$(get_domain) || return 1
     DOCKER_SITE_PATH="/var/www/${DOMAIN}"
     LOCATION=$(relation-get location 2>/dev/null) ||
         LOCATION="$DATASTORE/$BASE_SERVICE_NAME$DOCKER_SITE_PATH"