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diff --git a/guix-data-service/config.scm.in b/guix-data-service/config.scm.in
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+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2017, 2018 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU Affero General Public License
+;;; as published by the Free Software Foundation, either version 3 of
+;;; the License, or (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(define-module (guix-data-service config)
+  #:export (%config))
+
+(define %config
+  (let ((config
+         ;; Try to find the "assets" directory relative to the executable
+         ;; first.  This is useful when using "pre-inst-env".
+         `((assets-dir  . ,(let ((maybe-dir
+                                  (string-append (getcwd) "/assets")))
+                             (if (file-exists? maybe-dir)
+                                 maybe-dir
+                                 ;; TODO: use @assetsdir@ variable here
+                                 "@prefix@/share/guix-data-service/assets")))
+           (host        . "localhost")
+           (port        . 8765))))
+    (lambda (key)
+      (assoc-ref config key))))