fix: [gogocarto] remove error about missing ``dbname``

Used the new interface to traverse services and query relations.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

gogocarto/hooks/post_deploy

@@ -28,34 +28,17 @@ fi
 ## Get domain in option of relation "publish-dir"
 ##
 
-## XXXvlab: there is a tiny lapse of time where database is not yet
-## installed, and admin password is the default value.
 
-## XXXvlab: can't get real config here
-if ! read-0 publish_dir_ts _ _ < <(get_service_relation "$SERVICE_NAME" "publish-dir"); then
-    err "Couldn't find relation ${DARKCYAN}publish-dir${NORMAL}."
-    exit 1
-fi
-
-publish_dir_relation_dir=$(get_relation_data_dir "$SERVICE_NAME" "$publish_dir_ts" "publish-dir") || {
-    err "Failed to find relation file"
-    exit 1
-}
-
-publish_dir_relation_config=$(cat "$publish_dir_relation_dir/data") || exit 2
 
-domain=$(e "$publish_dir_relation_config" | shyaml get-value domain) || {
-    err "Couldn't get domain information in ${DARKCYAN}publish-dir${NORMAL} relation's data."
+if ! url=$(relation:get "$SERVICE_NAME":publish-dir url) || [ -z "$url" ]; then
+    err "Couldn't get ${WHITE}url${NORMAL} information in ${DARKCYAN}publish-dir${NORMAL} relation's data."
     exit 1
-}
+fi
 
-url=$(e "$publish_dir_relation_config" | shyaml get-value url) || {
-    err "Couldn't get domain information in ${DARKCYAN}publish-dir${NORMAL} relation's data."
-    exit 1
-}
 
 protocol="${url%%://*}"
-
+domain="${url#$protocol://}"
+domain="${domain%%/*}"
 
 ##
 ## We are in post_deploy, so our service is up, we need to get