build: Add `hydra.scm'.

* hydra.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.

Makefile.am

@@ -167,6 +167,7 @@ EXTRA_DIST =					\
   ROADMAP					\
   TODO						\
   .dir-locals.el				\
+  hydra.scm					\
   build-aux/download.scm			\
   srfi/srfi-64.scm				\
   srfi/srfi-64.upstream.scm			\

hydra.scm

@@ -0,0 +1,57 @@
+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; Guix 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.
+;;;
+;;; Guix 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 Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+;;;
+;;; This file defines build jobs for the Hydra continuation integration
+;;; tool.
+;;;
+
+(use-modules (guix store)
+             (guix packages)
+             (distro)
+             (distro packages guile)
+             (ice-9 match))
+
+(define (package->alist store package system)
+  "Convert PACKAGE to an alist suitable for Hydra."
+  `((derivation . ,(package-derivation store package system))
+    (description . ,(package-synopsis package))
+    (long-description . ,(package-description package))
+    (license . ,(package-license package))
+    (maintainers . ("gnu-system-discuss@gnu.org"))))
+
+(define (package-job store job-name package system)
+  "Return a job called JOB-NAME that builds PACKAGE on SYSTEM."
+  `(,job-name . ,(package->alist store package system)))
+
+(define (hydra-jobs store arguments)
+  "Return Hydra jobs."
+  (define system
+    (assoc-ref arguments "system"))
+
+  (map (match-lambda
+        ((job-name (? package? package))
+         (package-job store job-name package system))
+        ((job-name (? string? name))
+         (package-job store job-name
+                      (car (find-packages-by-name name))
+                      system)))
+       `((hello "hello")
+         (gmp "gmp")
+         (guile_2_0 ,guile-2.0)
+         (guile_1_8 ,guile-1.8))))