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diff --git a/examples/govuk-packages.scm b/examples/govuk-packages.scm
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+;;;; gnu-system.scm - build jobs for Guix
+;;;
+;;; Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
+;;;
+;;; This file is part of Cuirass.
+;;;
+;;; Cuirass is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; Cuirass 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 General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with Cuirass.  If not, see <http://www.gnu.org/licenses/>.
+
+;; Attempt to use Guix modules from git repository.
+(eval-when (compile load eval)
+  ;; Ignore any available .go, and force recompilation.  This is because our
+  ;; checkout in the store has mtime set to the epoch, and thus .go files look
+  ;; newer, even though they may not correspond.
+  (set! %fresh-auto-compile #t))
+
+(use-modules (guix config)
+             (guix store)
+             (guix grafts)
+             (guix packages)
+             (guix derivations)
+             (guix discovery)
+             (guix monads)
+             ((guix licenses)
+              #:select (gpl3+ license-name license-uri license-comment))
+             ((guix utils) #:select (%current-system))
+             ((guix scripts system) #:select (read-operating-system))
+             (gnu packages)
+             (gnu packages commencement)
+             (gnu packages guile)
+             (gnu packages make-bootstrap)
+             (gnu system)
+             (gnu system vm)
+             (gnu system install)
+             (srfi srfi-1)
+             (ice-9 match))
+
+(define (license->alist lcs)
+  "Return LCS <license> object as an alist."
+  ;; Sometimes 'license' field is a list of licenses.
+  (if (list? lcs)
+      (map license->alist lcs)
+      `((name . ,(license-name lcs))
+        (uri . ,(license-uri lcs))
+        (comment . ,(license-comment lcs)))))
+
+(define (package-metadata package)
+  "Convert PACKAGE to an alist suitable for Hydra."
+  `((#:description . ,(package-synopsis package))
+    (#:long-description . ,(package-description package))
+    (#:license . ,(license->alist (package-license package)))
+    (#:home-page . ,(package-home-page package))
+    (#:maintainers . ("bug-guix@gnu.org"))
+    (#:max-silent-time . ,(or (assoc-ref (package-properties package)
+                                         'max-silent-time)
+                              3600))      ;1 hour by default
+    (#:timeout . ,(or (assoc-ref (package-properties package) 'timeout)
+                      72000))))           ;20 hours by default
+
+(define (package-job store job-name package system)
+  "Return a job called JOB-NAME that builds PACKAGE on SYSTEM."
+  (lambda ()
+    `((#:job-name . ,(string-append (symbol->string job-name) "." system))
+      (#:derivation . ,(derivation-file-name
+                        (parameterize ((%graft? #f))
+                          (package-derivation store package system
+                                              #:graft? #f))))
+      ,@(package-metadata package))))
+
+(define %job-name
+  ;; Return the name of a package's job.
+  (compose string->symbol package-full-name))
+
+(define package->job
+  (let ((base-packages
+         (delete-duplicates
+          (append-map (match-lambda
+                       ((_ package _ ...)
+                        (match (package-transitive-inputs package)
+                          (((_ inputs _ ...) ...)
+                           inputs))))
+                      %final-inputs))))
+    (lambda (store package system)
+      "Return a job for PACKAGE on SYSTEM, or #f if this combination is not
+valid."
+      (cond ((member package base-packages)
+             #f)
+            ((supported-package? package system)
+             (package-job store (%job-name package) package system))
+            (else
+             #f)))))
+
+(define (fold-packages-in-modules modules proc init)
+  "Call (PROC PACKAGE RESULT) for each available package within any of the
+modules in MODULES, using INIT as the initial value of RESULT.  It is
+guaranteed to never traverse the same package twice."
+  (fold-module-public-variables (lambda (object result)
+                                  (if (and (package? object)
+                                           (not (hidden-package? object)))
+                                      (proc object result)
+                                      result))
+                                init
+                                modules))
+
+(define (gov.uk-jobs store arguments)
+  (peek "getcwd" (getcwd))
+  (parameterize ((%graft? #f))
+    (let ((pkgs (fold-packages-in-modules
+                 (all-modules (list
+                               (string-append
+                                (getcwd)
+                                "/.guix-package-path")))
+                 cons
+                 '())))
+      (peek "getcwd" (getcwd))
+      (peek "pkgs" pkgs)
+      (exit 1)
+      (filter-map (lambda (pkg)
+                    (package->job store pkg system))
+                  (peek "pkgs" pkgs)))))
+