Check whether Metabase DB is set up before attempting to set site-url in middleware

src/metabase/db.clj

@@ -289,6 +289,11 @@
 (def ^:private setup-db-has-been-called?
   (atom false))
 
+(defn db-is-setup?
+  "True if the Metabase DB is setup and ready."
+  ^Boolean []
+  @setup-db-has-been-called?)
+
 (def ^:dynamic *allow-potentailly-unsafe-connections*
   "We want to make *every* database connection made by the drivers safe -- read-only, only connect if DB file exists, etc.
    At the same time, we'd like to be able to use driver functionality like `can-connect-with-details?` to check whether we can
@@ -360,11 +365,11 @@
   [& {:keys [db-details auto-migrate]
       :or   {db-details   @db-connection-details
              auto-migrate true}}]
-  (reset! setup-db-has-been-called? true)
   (verify-db-connection db-details)
   (run-schema-migrations! auto-migrate db-details)
   (create-connection-pool! (jdbc-details db-details))
-  (run-data-migrations!))
+  (run-data-migrations!)
+  (reset! setup-db-has-been-called? true))
 
 (defn setup-db-if-needed!
   "Call `setup-db!` if DB is not already setup; otherwise this does nothing."

src/metabase/middleware.clj

@@ -260,10 +260,11 @@
   "Middleware to set the `site-url` Setting if it's unset the first time a request is made."
   [handler]
   (fn [{{:strs [origin host] :as headers} :headers, :as request}]
-    (when-not (public-settings/site-url)
-      (when-let [site-url (or origin host)]
-        (log/info "Setting Metabase site URL to" site-url)
-        (public-settings/site-url site-url)))
+    (when (mdb/db-is-setup?)
+      (when-not (public-settings/site-url)
+        (when-let [site-url (or origin host)]
+          (log/info "Setting Metabase site URL to" site-url)
+          (public-settings/site-url site-url))))
     (handler request)))