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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU 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.
+;;;
+;;; GNU 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+;;;
+;;; This file defines build jobs for the Hydra continuation integration
+;;; tool.
+;;;
+
+;; Attempt to use our very own Guix modules.
+(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)
+
+  (and=> (assoc-ref (current-source-location) 'filename)
+         (lambda (file)
+           (let ((dir (string-append (dirname file) "/../..")))
+             (format (current-error-port) "prepending ~s to the load path~%"
+                     dir)
+             (set! %load-path (cons dir %load-path))))))
+
+(use-modules (guix store)
+             (guix packages)
+             ((guix utils) #:select (%current-system))
+             (gnu packages)
+             (gnu packages base)
+             (gnu packages gawk)
+             (gnu packages guile)
+             (gnu packages gettext)
+             (gnu packages multiprecision)
+             (gnu packages make-bootstrap)
+             (srfi srfi-1)
+             (srfi srfi-26)
+             (ice-9 match))
+
+;; XXX: Debugging hack: since `hydra-eval-guile-jobs' redirects the output
+;; port to the bit bucket, let us write to the error port instead.
+(setvbuf (current-error-port) _IOLBF)
+(set-current-output-port (current-error-port))
+
+(define* (package->alist store package system
+                         #:optional (package-derivation package-derivation))
+  "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))
+    (home-page . ,(package-home-page package))
+    (maintainers . ("bug-guix@gnu.org"))))
+
+(define (package-job store job-name package system)
+  "Return a job called JOB-NAME that builds PACKAGE on SYSTEM."
+  `(,job-name . ,(cut package->alist store package system)))
+
+(define (package-cross-job store job-name package target system)
+  "Return a job called TARGET.JOB-NAME that cross-builds PACKAGE for TARGET on
+SYSTEM."
+  `(,(symbol-append (string->symbol target) (string->symbol ".") job-name) .
+    ,(cute package->alist store package system
+           (cut package-cross-derivation <> <> target <>))))
+
+(define %packages-to-cross-build
+  (list gmp mpfr mpc coreutils findutils diffutils patch sed grep
+        gawk gettext hello guile-2.0
+        ;; %bootstrap-binaries-tarball
+        ;; %binutils-bootstrap-tarball
+        ;; %glibc-bootstrap-tarball
+        ;; %gcc-bootstrap-tarball
+        ;; %guile-bootstrap-tarball
+        ))
+
+(define %cross-targets
+  '("mips64el-linux-gnu"))
+
+(define (hydra-jobs store arguments)
+  "Return Hydra jobs."
+  (define system
+    (or (assoc-ref arguments system)
+        (%current-system)))
+
+  (define job-name
+    (compose string->symbol package-full-name))
+
+  (define cross-jobs
+    (append-map (lambda (target)
+                  (map (lambda (package)
+                         (package-cross-job store (job-name package)
+                                            package target system))
+                       %packages-to-cross-build))
+                %cross-targets))
+
+  ;; Return one job for each package, except bootstrap packages.
+  (let ((base-packages (delete-duplicates
+                        (append-map (match-lambda
+                                     ((_ package _ ...)
+                                      (match (package-transitive-inputs
+                                              package)
+                                        (((_ inputs _ ...) ...)
+                                         inputs))))
+                                    %final-inputs))))
+    (fold-packages (lambda (package result)
+                     (if (member package base-packages)
+                         result
+                         (cons (package-job store (job-name package)
+                                            package system)
+                               result)))
+                   cross-jobs)))