ci: Remove hydra support.

This removes hydra support to use Cuirass as the only continuous integration
system.

* build-aux/hydra/gnu-system.scm: Remove it.
* build-aux/hydra/guix-modular.scm: Ditto.
* build-aux/hydra/guix.scm: Ditto.
* build-aux/cuirass/hydra-to-cuirass.scm: Ditto.
* Makefile.am (EXTRA_DIST): Update it.
(hydra-jobs.scm): Remove it.
(cuirass-jobs.scm): Update it.
* build-aux/hydra/evaluate.scm: Move it to ...
* build-aux/cuirass/evaluate.scm: ... here.
* build-aux/cuirass/guix-modular.scm: Remove it.
* build-aux/cuirass/gnu-system.scm: Ditto.
* guix/packages.scm (%hydra-supported-systems): Rename it to ...
(%cuirass-supported-systems): ... this variable.
* build-aux/check-final-inputs-self-contained: Adapt it.
* etc/release-manifest.scm: Ditto.
* gnu/ci.scm (package->alist): Remove it.
(derivation->job): New procedure.
(package-job, package-cross-job, cross-jobs, image-jobs, system-test-jobs,
tarball-jobs): Use it.
(guix-jobs): New procedure.
(hydra-jobs): Rename it to ...
(cuirass-jobs): ... this procedure.

9 files changed, 106 insertions, 496 deletions

diff --git a/build-aux/check-final-inputs-self-contained.scm b/build-aux/check-final-inputs-self-contained.scm
index c819086508..a6148d12e3 100644
--- a/build-aux/check-final-inputs-self-contained.scm
+++ b/build-aux/check-final-inputs-self-contained.scm
@@ -83,5 +83,4 @@ refer to the bootstrap tools."
     (set-build-options store #:use-substitutes? #t)
 
     (for-each (cut test-final-inputs store <>)
-              %hydra-supported-systems)))
-
+              %cuirass-supported-systems)))
diff --git a/build-aux/cuirass/evaluate.scm b/build-aux/cuirass/evaluate.scm
new file mode 100644
index 0000000000..fc0744ad2a
--- /dev/null
+++ b/build-aux/cuirass/evaluate.scm
@@ -0,0 +1,105 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016, 2017, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
+;;; Copyright © 2021 Mathieu Othacehe <othacehe@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 program replicates the behavior of Cuirass's 'evaluate' process.
+;;; It displays the evaluated jobs on the standard output.
+
+(use-modules (guix channels)
+             (guix derivations)
+             (guix git-download)
+             (guix inferior)
+             (guix packages)
+             (guix store)
+             (guix ui)
+             ((guix ui) #:select (build-notifier))
+             (ice-9 match)
+             (ice-9 threads))
+
+(define %top-srcdir
+  (and=> (assq-ref (current-source-location) 'filename)
+         (lambda (file)
+           (canonicalize-path
+            (string-append (dirname file) "/../..")))))
+
+(match (command-line)
+  ((command directory)
+   (let ((real-build-things build-things))
+     (with-store store
+       ;; Make sure we don't resort to substitutes.
+       (set-build-options store
+                          #:use-substitutes? #f
+                          #:substitute-urls '())
+
+       ;; The evaluation of Guix itself requires building a "trampoline"
+       ;; program, and possibly everything it depends on.  Thus, allow builds
+       ;; but print a notification.
+       (with-build-handler (build-notifier #:use-substitutes? #f)
+
+         ;; Add %TOP-SRCDIR to the store with a proper Git predicate so we
+         ;; work from a clean checkout.
+         (let ((source (add-to-store store "guix-source" #t
+                                     "sha256" %top-srcdir
+                                     #:select? (git-predicate %top-srcdir))))
+           (define instances
+             (list (checkout->channel-instance source)))
+
+           (define channels
+             (map channel-instance-channel instances))
+
+           (define derivation
+             ;; Compute the derivation of Guix for COMMIT.
+             (run-with-store store
+               (channel-instances->derivation instances)))
+
+           ;; TODO: Remove 'show-what-to-build' call when Cuirass' 'evaluate'
+           ;; scripts uses 'with-build-handler'.
+           (show-what-to-build store (list derivation))
+           (build-derivations store (list derivation))
+
+
+           ;; Evaluate jobs on a per-system basis for two reasons.  It speeds
+           ;; up the evaluation speed as the evaluations can be performed
+           ;; concurrently.  It also decreases the amount of memory needed per
+           ;; evaluation process.
+           (n-par-for-each
+            (/ (current-processor-count) 2)
+            (lambda (system)
+              (with-store store
+                (let ((inferior
+                       (open-inferior (derivation->output-path derivation)))
+                      (channels (map channel-instance->sexp instances)))
+                  (inferior-eval '(use-modules (gnu ci)) inferior)
+                  (let ((jobs
+                         (inferior-eval-with-store
+                          inferior store
+                          `(lambda (store)
+                             (cuirass-jobs store
+                                           '((subset . all)
+                                             (systems . ,(list system))
+                                             (channels . ,channels))))))
+                        (file
+                         (string-append directory "/jobs-" system ".scm")))
+                    (call-with-output-file file
+                      (lambda (port)
+                        (write jobs port)))))))
+            %cuirass-supported-systems))))))
+  (x
+   (format (current-error-port) "Wrong command: ~a~%." x)
+   (exit 1)))
diff --git a/build-aux/cuirass/gnu-system.scm b/build-aux/cuirass/gnu-system.scm
deleted file mode 100644
index 0eb834cfba..0000000000
--- a/build-aux/cuirass/gnu-system.scm
+++ /dev/null
@@ -1,25 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@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 Cuirass continuation integration
-;;; tool.
-;;;
-
-(include "../hydra/gnu-system.scm")
-(include "hydra-to-cuirass.scm")
diff --git a/build-aux/cuirass/guix-modular.scm b/build-aux/cuirass/guix-modular.scm
deleted file mode 100644
index cbbdbf1133..0000000000
--- a/build-aux/cuirass/guix-modular.scm
+++ /dev/null
@@ -1,6 +0,0 @@
-;;;
-;;; This file defines Cuirass build jobs to build Guix itself.
-;;;
-
-(include "../hydra/guix-modular.scm")
-(include "hydra-to-cuirass.scm")
diff --git a/build-aux/cuirass/hydra-to-cuirass.scm b/build-aux/cuirass/hydra-to-cuirass.scm
deleted file mode 100644
index 75c77ea35a..0000000000
--- a/build-aux/cuirass/hydra-to-cuirass.scm
+++ /dev/null
@@ -1,47 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@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 the conversion of Hydra build jobs to Cuirass build
-;;; jobs.  It is meant to be included in other files.
-;;;
-
-(use-modules ((guix licenses)
-              #:select (license? license-name license-uri license-comment)))
-
-(define (cuirass-jobs store arguments)
-  "Return Cuirass jobs."
-  (map hydra-job->cuirass-job (hydra-jobs store arguments)))
-
-(define (hydra-job->cuirass-job hydra-job)
-  (let ((name (car hydra-job))
-        (job ((cdr hydra-job))))
-    (lambda _ (acons #:job-name (symbol->string name)
-                     (map symbol-alist-entry->keyword-alist-entry job)))))
-
-(define (symbol-alist-entry->keyword-alist-entry entry)
-  (cons (symbol->keyword (car entry)) (entry->sexp-entry (cdr entry))))
-
-(define (entry->sexp-entry o)
-  (match o
-    ((? license?) `((name . (license-name o))
-                    (uri . ,(license-uri o))
-                    (comment . ,(license-comment o))))
-    ((lst ...)
-     (map entry->sexp-entry lst))
-    (_ o)))
diff --git a/build-aux/hydra/evaluate.scm b/build-aux/hydra/evaluate.scm
deleted file mode 100644
index c74fcdb763..0000000000
--- a/build-aux/hydra/evaluate.scm
+++ /dev/null
@@ -1,131 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2016, 2017, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@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 program replicates the behavior of Hydra's 'hydra-eval-guile-job'.
-;;; It evaluates the Hydra job defined by the program passed as its first
-;;; arguments and outputs an sexp of the jobs on standard output.
-
-(use-modules (guix store)
-             (guix git-download)
-             ((guix build utils) #:select (with-directory-excursion))
-             ((guix ui) #:select (build-notifier))
-             (srfi srfi-19)
-             (ice-9 match)
-             (ice-9 pretty-print)
-             (ice-9 format))
-
-(define %top-srcdir
-  (and=> (assq-ref (current-source-location) 'filename)
-         (lambda (file)
-           (canonicalize-path
-            (string-append (dirname file) "/../..")))))
-
-(define %user-module
-  ;; Hydra user module.
-  (let ((m (make-module)))
-    (beautify-user-module! m)
-    m))
-
-(define (call-with-time thunk kont)
-  "Call THUNK and pass KONT the elapsed time followed by THUNK's return
-values."
-  (let* ((start  (current-time time-monotonic))
-         (result (call-with-values thunk list))
-         (end    (current-time time-monotonic)))
-    (apply kont (time-difference end start) result)))
-
-(define (call-with-time-display thunk)
-  "Call THUNK and write to the current output port its duration."
-  (call-with-time thunk
-    (lambda (time . results)
-      (format #t "~,3f seconds~%"
-              (+ (time-second time)
-                 (/ (time-nanosecond time) 1e9)))
-      (apply values results))))
-
-(define (assert-valid-job job thing)
-  "Raise an error if THING is not an alist with a valid 'derivation' entry.
-Otherwise return THING."
-  (unless (and (list? thing)
-               (and=> (assoc-ref thing 'derivation)
-                      (lambda (value)
-                        (and (string? value)
-                             (string-suffix? ".drv" value)))))
-    (error "job did not produce a valid alist" job thing))
-  thing)
-
-
-;; Without further ado...
-(match (command-line)
-  ((command file cuirass? ...)
-   ;; Load FILE, a Scheme file that defines Hydra jobs.
-   (let ((port (current-output-port))
-         (real-build-things build-things))
-     (with-store store
-       ;; Make sure we don't resort to substitutes.
-       (set-build-options store
-                          #:use-substitutes? #f
-                          #:substitute-urls '())
-
-       ;; The evaluation of Guix itself requires building a "trampoline"
-       ;; program, and possibly everything it depends on.  Thus, allow builds
-       ;; but print a notification.
-       (with-build-handler (build-notifier #:use-substitutes? #f)
-
-         ;; Add %TOP-SRCDIR to the store with a proper Git predicate so we work
-         ;; from a clean checkout
-         (let ((source (add-to-store store "guix-source" #t
-                                     "sha256" %top-srcdir
-                                     #:select? (git-predicate %top-srcdir))))
-           (with-directory-excursion source
-             (save-module-excursion
-              (lambda ()
-                (set-current-module %user-module)
-                (format (current-error-port)
-                        "loading '~a' relative to '~a'...~%"
-                        file source)
-                (primitive-load file))))
-
-           ;; Call the entry point of FILE and print the resulting job sexp.
-           (pretty-print
-            (match ((module-ref %user-module
-                                (if (equal? cuirass? "cuirass")
-                                    'cuirass-jobs
-                                    'hydra-jobs))
-                    store `((guix
-                             . ((file-name . ,source)))))
-              (((names . thunks) ...)
-               (map (lambda (job thunk)
-                      (format (current-error-port) "evaluating '~a'... " job)
-                      (force-output (current-error-port))
-                      (cons job
-                            (assert-valid-job job
-                                              (call-with-time-display thunk))))
-                    names thunks)))
-            port))))))
-  ((command _ ...)
-   (format (current-error-port) "Usage: ~a FILE [cuirass]
-Evaluate the Hydra or Cuirass jobs defined in FILE.~%"
-           command)
-   (exit 1)))
-
-;;; Local Variables:
-;;; eval: (put 'call-with-time 'scheme-indent-function 1)
-;;; End:
-
diff --git a/build-aux/hydra/gnu-system.scm b/build-aux/hydra/gnu-system.scm
deleted file mode 100644
index a03324daeb..0000000000
--- a/build-aux/hydra/gnu-system.scm
+++ /dev/null
@@ -1,88 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2020 Ludovic Courtès <ludo@gnu.org>
-;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
-;;; Copyright © 2018, 2019 Clément Lassieur <clement@lassieur.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.
-;;;
-
-(use-modules (guix inferior) (guix channels)
-             (guix)
-             (guix ui)
-             (srfi srfi-1)
-             (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) 'line)
-(set-current-output-port (current-error-port))
-
-(define (find-current-checkout arguments)
-  "Find the first checkout of ARGUMENTS that provided the current file.
-Return #f if no such checkout is found."
-  (let ((current-root
-         (canonicalize-path
-          (string-append (dirname (current-filename)) "/../.."))))
-    (find (lambda (argument)
-            (and=> (assq-ref argument 'file-name)
-                   (lambda (name)
-                     (string=? name current-root)))) arguments)))
-
-(define (hydra-jobs store arguments)
-  "Return a list of jobs where each job is a NAME/THUNK pair."
-
-  (define checkout
-    (find-current-checkout arguments))
-
-  (define commit
-    (assq-ref checkout 'revision))
-
-  (define source
-    (assq-ref checkout 'file-name))
-
-  (define instance
-    (checkout->channel-instance source #:commit commit))
-
-  (define derivation
-    ;; Compute the derivation of Guix for COMMIT.
-    (run-with-store store
-      (channel-instances->derivation (list instance))))
-
-  ;; TODO: Remove 'show-what-to-build' call when Cuirass' 'evaluate' scripts
-  ;; uses 'with-build-handler'.
-  (show-what-to-build store (list derivation))
-  (build-derivations store (list derivation))
-
-  ;; Open an inferior for the just-built Guix.
-  (let ((inferior (open-inferior (derivation->output-path derivation))))
-    (inferior-eval '(use-modules (gnu ci) (ice-9 match)) inferior)
-
-    (map (match-lambda
-           ((name . fields)
-            ;; Hydra expects a thunk, so here it is.
-            (cons name (lambda () fields))))
-         (inferior-eval-with-store
-          inferior store
-          `(lambda (store)
-             (map (match-lambda
-                    ((name . thunk)
-                     (cons name (thunk))))
-                  (hydra-jobs store '((superior-guix-checkout . ,checkout)
-                                      ,@arguments))))))))
diff --git a/build-aux/hydra/guix-modular.scm b/build-aux/hydra/guix-modular.scm
deleted file mode 100644
index 060b84b8ef..0000000000
--- a/build-aux/hydra/guix-modular.scm
+++ /dev/null
@@ -1,91 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017, 2018, 2020 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 a continuous integration job to build the same modular
-;;; Guix as 'guix pull', which is defined in (guix self).
-;;;
-
-(use-modules (guix store)
-             (guix config)
-             (guix utils)
-             ((guix packages) #:select (%hydra-supported-systems))
-             (guix derivations)
-             (guix monads)
-             ((guix licenses) #:prefix license:)
-             (srfi srfi-1)
-             (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) 'line)
-(set-current-output-port (current-error-port))
-
-(define* (build-job store source version system)
-  "Return a Hydra job a list building the modular Guix derivation from SOURCE
-for SYSTEM.  Use VERSION as the version identifier."
-  (lambda ()
-    (define build
-      (primitive-load (string-append source "/build-aux/build-self.scm")))
-
-    (let ((drv (run-with-store store
-                 (build source #:version version #:system system
-                        #:pull-version 1
-                        #:guile-version "2.2"))))
-      `((derivation . ,(derivation-file-name drv)) ;the latest 2.2.x
-        (log . ,(log-file store (derivation-file-name drv)))
-        (outputs . ,(filter-map (lambda (res)
-                                  (match res
-                                    ((name . path)
-                                     `(,name . ,path))))
-                                (derivation->output-paths drv)))
-        (nix-name . ,(derivation-name drv))
-        (system . ,(derivation-system drv))
-        (description . "Modular Guix")
-        (long-description
-         . "This is the modular Guix package as produced by 'guix pull'.")
-        (license . ,license:gpl3+)
-        (home-page . ,%guix-home-page-url)
-        (maintainers . (,%guix-bug-report-address))))))
-
-(define (hydra-jobs store arguments)
-  "Return Hydra jobs."
-  (define systems
-    (match (assoc-ref arguments 'systems)
-      (#f              %hydra-supported-systems)
-      ((lst ...)       lst)
-      ((? string? str) (call-with-input-string str read))))
-
-  (define guix-checkout
-    (or (assq-ref arguments 'guix)                ;Hydra on hydra
-        (assq-ref arguments 'guix-modular)))      ;Cuirass on berlin
-
-  (define version
-    (or (assq-ref guix-checkout 'revision)
-        "0.unknown"))
-
-  (let ((file (assq-ref guix-checkout 'file-name)))
-    (format (current-error-port) "using checkout ~s (~s; arguments: ~s)~%"
-            guix-checkout file arguments)
-
-    (map (lambda (system)
-           (let ((name (string->symbol
-                        (string-append "guix." system))))
-             `(,name
-               . ,(build-job store file version system))))
-         systems)))
diff --git a/build-aux/hydra/guix.scm b/build-aux/hydra/guix.scm
deleted file mode 100644
index 08193ec82e..0000000000
--- a/build-aux/hydra/guix.scm
+++ /dev/null
@@ -1,106 +0,0 @@
-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 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 of Guix itself for the Hydra continuation
-;;; integration tool.
-;;;
-
-;; Attempt to use our very own Guix modules.
-(eval-when (expand 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)
-
-  ;; Display which files are loaded.
-  (set! %load-verbosely #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)
-             (guix grafts)
-             (guix derivations)
-             (guix build-system gnu)
-             (gnu packages package-management)
-             (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 . ,(derivation-file-name
-                    (parameterize ((%graft? #f))
-                      (package-derivation store package system
-                                          #:graft? #f))))
-    (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 (hydra-jobs store arguments)
-  "Return Hydra jobs."
-  (define systems
-    (match (filter-map (match-lambda
-                        (('system . value)
-                         value)
-                        (_ #f))
-                       arguments)
-      ((lst ..1)
-       lst)
-      (_
-       (list (%current-system)))))
-
-  (define guix-checkout
-    (assq-ref arguments 'guix))
-
-  (let ((file (assq-ref guix-checkout 'file-name)))
-    (format (current-error-port) "using checkout ~s (~s)~%"
-            guix-checkout file)
-
-    `((tarball . ,(cute package->alist store
-                        (dist-package guix file)
-                        (%current-system)))
-
-      ,@(map (lambda (system)
-               (let ((name (string->symbol
-                            (string-append "guix." system))))
-                 `(,name
-                   . ,(cute package->alist store
-                            (package
-                              (inherit guix)
-                              (version "latest")
-                              (source file))
-                            system))))
-             %hydra-supported-systems))))