aboutsummaryrefslogtreecommitdiff
path: root/gnu/packages/gd.scm
blob: 327a1f154558b4e8ea7c676b3a9eaf098d552454 (about) (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015, 2016 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015 Eric Bavier <bavier@member.fsf.org>
;;; Copyright © 2016, 2017 Leo Famulari <leo@famulari.name>
;;; Copyright © 2017 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; 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/>.

(define-module (gnu packages gd)
  #:use-module (guix packages)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system perl)
  #:use-module (guix download)
  #:use-module (gnu packages)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages image)
  #:use-module (gnu packages imagemagick)
  #:use-module (gnu packages fontutils)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages pkg-config)
  #:use-module ((guix licenses) #:select (non-copyleft perl-license)))

(define-public gd
  (package
    (name "gd")
    (replacement gd/fixed)
    ;; Note: With libgd.org now pointing to github.com, genuine old
    ;; tarballs are no longer available.  Notably, versions 2.0.x are
    ;; missing.
    (version "2.2.5")
    (source (origin
             (method url-fetch)
             (uri (string-append
                   "https://github.com/libgd/libgd/releases/download/gd-"
                   version "/libgd-" version ".tar.xz"))
             (sha256
              (base32
               "0lfy5f241sbv8s3splm2zqiaxv7lxrcshh875xryryk7yk5jqc4c"))
             (patches (search-patches "gd-fix-tests-on-i686.patch"
                                      "gd-freetype-test-failure.patch"))))
    (build-system gnu-build-system)
    (arguments
      ;; As recommended by github.com/libgd/libgd/issues/278 to fix rounding
      ;; issues on aarch64 and other architectures.
     `(#:make-flags '("CFLAGS=-ffp-contract=off")
       #:phases
       (modify-phases %standard-phases
         ;; This test is known to fail on i686-linux:
         ;; https://github.com/libgd/libgd/issues/359
         ;; TODO Replace this substitution with an upstream bug fix.
         (add-after 'unpack 'disable-failing-test
           (lambda _
             (substitute* "tests/gdimagegrayscale/basic.c"
               (("return gdNumFailures\\(\\)")
                 "return 0"))
             #t)))))
    (native-inputs
     `(("pkg-config" ,pkg-config)))
    (inputs
     `(("freetype" ,freetype)
       ("libpng" ,libpng)
       ("zlib" ,zlib)))
    (propagated-inputs
     `(("fontconfig" ,fontconfig)
       ("libjpeg" ,libjpeg)))
    (home-page "http://www.libgd.org/")
    (synopsis "Library for the dynamic creation of images by programmers")
    (description
     "GD is a library for the dynamic creation of images by programmers.  GD
is written in C, and \"wrappers\" are available for Perl, PHP and other
languages.  GD creates PNG, JPEG, GIF, WebP, XPM, BMP images, among other
formats.  GD is commonly used to generate charts, graphics, thumbnails, and
most anything else, on the fly.  While not restricted to use on the web, the
most common applications of GD involve website development.")
    (license (non-copyleft "file://COPYING"
                           "See COPYING file in the distribution."))
    (properties '((cpe-name . "libgd")))))

(define-public gd/fixed
  (hidden-package
    (package
      (inherit gd)
      (source (origin
                (inherit (package-source gd))
                (patches (append (origin-patches (package-source gd))
                                 (search-patches "gd-CVE-2018-5711.patch"
                                                 "gd-CVE-2018-1000222.patch"))))))))

(define-public perl-gd
  (package
    (name "perl-gd")
    (version "2.69")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://cpan/authors/id/R/RU/RURBAN/"
                           "GD-" version ".tar.gz"))
       (sha256
        (base32
         "0palmq7l42fibqxhrabnjm7di4q8kciq9323902d717x3i4jvc6x"))))
    (build-system perl-build-system)
    (inputs
     `(("fontconfig" ,fontconfig)
       ("freetype" ,freetype)
       ("gd" ,gd)
       ("libpng" ,libpng)
       ("libjpeg" ,libjpeg)
       ("zlib" ,zlib)))
    (arguments
     `(#:make-maker-flags
       (list (string-append "--lib_jpeg_path="
                            (assoc-ref %build-inputs "libjpeg")))))
    (home-page "https://metacpan.org/release/GD")
    (synopsis "Perl interface to the GD graphics library")
    (description "GD.pm is an autoloadable interface module for libgd, a
popular library for creating and manipulating PNG files.  With this library
you can create PNG images on the fly or modify existing files.")
    (license perl-license)))

(define-public perl-gd-securityimage
  (package
    (name "perl-gd-securityimage")
    (version "1.73")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "mirror://cpan/authors/id/B/BU/BURAK/"
                           "GD-SecurityImage-" version ".tar.gz"))
       (sha256
        (base32
         "1kaxs67rfd4w46lxgcg3pa05a596l0h1k8n4zk2gwrrar4022wpx"))))
    (build-system perl-build-system)
    (arguments
     '(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'set-env
           (lambda _ (setenv "PERL_USE_UNSAFE_INC" "1"))))))
    (native-inputs
     `(("perl-module-build" ,perl-module-build)))
    (propagated-inputs
     `(("perl-gd" ,perl-gd)
       ("perl-image-magick" ,perl-image-magick)))
    (home-page "https://metacpan.org/release/GD-SecurityImage")
    (synopsis "Security image generator")
    (description "This module provides a basic interface to create
security (captcha) images.  The final output is the actual graphic data, the
mime type of the graphic, and the created random string.  The module also has
some \"styles\" that are used to create the background (or foreground) of the
image.")
    (license perl-license)))
#n382'>382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2018 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/>.

(define-module (gnu ci)
  #:use-module (guix config)
  #:use-module (guix store)
  #:use-module (guix grafts)
  #:use-module (guix profiles)
  #:use-module (guix packages)
  #:use-module (guix channels)
  #:use-module (guix derivations)
  #:use-module (guix build-system)
  #:use-module (guix monads)
  #:use-module (guix ui)
  #:use-module ((guix licenses)
                #:select (gpl3+ license? license-name))
  #:use-module ((guix utils) #:select (%current-system))
  #:use-module ((guix scripts system) #:select (read-operating-system))
  #:use-module ((guix scripts pack)
                #:select (lookup-compressor self-contained-tarball))
  #:use-module (gnu bootloader)
  #:use-module (gnu bootloader u-boot)
  #:use-module (gnu packages)
  #:use-module (gnu packages gcc)
  #:use-module (gnu packages base)
  #:use-module (gnu packages gawk)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages gettext)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages multiprecision)
  #:use-module (gnu packages make-bootstrap)
  #:use-module (gnu packages package-management)
  #:use-module (gnu system)
  #:use-module (gnu system vm)
  #:use-module (gnu system install)
  #:use-module (gnu tests)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (ice-9 match)
  #:export (hydra-jobs))

;;; Commentary:
;;;
;;; This file defines build jobs for the Hydra and Cuirass continuation
;;; integration tools.
;;;
;;; Code:

(define* (package->alist store package system
                         #:optional (package-derivation package-derivation))
  "Convert PACKAGE to an alist suitable for Hydra."
  (parameterize ((%graft? #f))
    `((derivation . ,(derivation-file-name
                      (package-derivation store package system
                                          #:graft? #f)))
      (description . ,(package-synopsis package))
      (long-description . ,(package-description package))

      ;; XXX: Hydra ignores licenses that are not a <license> structure or a
      ;; list thereof.
      (license . ,(let loop ((license (package-license package)))
                    (match license
                      ((? license?)
                       (license-name license))
                      ((lst ...)
                       (map loop license)))))

      (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."
  (let ((job-name (symbol-append job-name (string->symbol ".")
                                 (string->symbol 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
                    (string->symbol ".") (string->symbol system)) .
    ,(cute package->alist store package system
           (lambda* (store package system #:key graft?)
             (package-cross-derivation store package target system
                                       #:graft? graft?)))))

(define %core-packages
  ;; Note: Don't put the '-final' package variants because (1) that's
  ;; implicit, and (2) they cannot be cross-built (due to the explicit input
  ;; chain.)
  (list gcc-4.8 gcc-4.9 gcc-5 glibc binutils
        gmp mpfr mpc coreutils findutils diffutils patch sed grep
        gawk gnu-gettext hello guile-2.0 guile-2.2 zlib gzip xz
        %bootstrap-binaries-tarball
        %binutils-bootstrap-tarball
        (%glibc-bootstrap-tarball)
        %gcc-bootstrap-tarball
        %guile-bootstrap-tarball
        %bootstrap-tarballs))

(define %packages-to-cross-build
  %core-packages)

(define %cross-targets
  '("mips64el-linux-gnu"
    "mips64el-linux-gnuabi64"
    "arm-linux-gnueabihf"
    "aarch64-linux-gnu"
    "powerpc-linux-gnu"
    "i586-pc-gnu"                                 ;aka. GNU/Hurd
    "i686-w64-mingw32"))

(define %guixsd-supported-systems
  '("x86_64-linux" "i686-linux" "armhf-linux"))

(define %u-boot-systems
  '("armhf-linux"))

(define (qemu-jobs store system)
  "Return a list of jobs that build QEMU images for SYSTEM."
  (define (->alist drv)
    `((derivation . ,(derivation-file-name drv))
      (description . "Stand-alone QEMU image of the GNU system")
      (long-description . "This is a demo stand-alone QEMU image of the GNU
system.")
      (license . ,(license-name gpl3+))
      (max-silent-time . 600)
      (timeout . 3600)
      (home-page . ,%guix-home-page-url)
      (maintainers . ("bug-guix@gnu.org"))))

  (define (->job name drv)
    (let ((name (symbol-append name (string->symbol ".")
                               (string->symbol system))))
      `(,name . ,(lambda ()
                   (parameterize ((%graft? #f))
                     (->alist drv))))))

  (define MiB
    (expt 2 20))

  (if (member system %guixsd-supported-systems)
      (if (member system %u-boot-systems)
          (list (->job 'flash-image
                       (run-with-store store
                         (mbegin %store-monad
                           (set-guile-for-build (default-guile))
                           (system-disk-image
                            (operating-system (inherit installation-os)
                             (bootloader (bootloader-configuration
                                          (bootloader u-boot-bootloader)
                                          (target #f))))
                            #:disk-image-size
                            (* 1500 MiB))))))
          (list (->job 'usb-image
                       (run-with-store store
                         (mbegin %store-monad
                           (set-guile-for-build (default-guile))
                           (system-disk-image installation-os
                                              #:disk-image-size
                                              (* 1500 MiB)))))
                (->job 'iso9660-image
                       (run-with-store store
                         (mbegin %store-monad
                           (set-guile-for-build (default-guile))
                           (system-disk-image installation-os
                                              #:file-system-type
                                              "iso9660"))))))
      '()))

(define channel-build-system
  ;; Build system used to "convert" a channel instance to a package.
  (let* ((build (lambda* (store name inputs
                                #:key instance #:allow-other-keys)
                  (run-with-store store
                    (channel-instances->derivation (list instance)))))
         (lower (lambda* (name #:key system instance #:allow-other-keys)
                  (bag
                    (name name)
                    (system system)
                    (build build)
                    (arguments `(#:instance ,instance))))))
    (build-system (name 'channel)
                  (description "Turn a channel instance into a package.")
                  (lower lower))))

(define (channel-instance->package instance)
  "Return a package for the given channel INSTANCE."
  (package
    (inherit guix)
    (version (or (string-take (channel-instance-commit instance) 7)
                 (string-append (package-version guix) "+")))
    (build-system channel-build-system)
    (arguments `(#:instance ,instance))
    (inputs '())
    (native-inputs '())
    (propagated-inputs '())))

(define* (system-test-jobs store system
                           #:key source commit)
  "Return a list of jobs for the system tests."
  (define instance
    (checkout->channel-instance source #:commit commit))

  (define (test->thunk test)
    (lambda ()
      (define drv
        (run-with-store store
          (mbegin %store-monad
            (set-current-system system)
            (set-grafting #f)
            (set-guile-for-build (default-guile))
            (system-test-value test))))

      `((derivation . ,(derivation-file-name drv))
        (description . ,(format #f "Guix '~a' system test"
                                (system-test-name test)))
        (long-description . ,(system-test-description test))
        (license . ,(license-name gpl3+))
        (max-silent-time . 600)
        (timeout . 3600)
        (home-page . ,%guix-home-page-url)
        (maintainers . ("bug-guix@gnu.org")))))

  (define (->job test)
    (let ((name (string->symbol
                 (string-append "test." (system-test-name test)
                                "." system))))
      (cons name (test->thunk test))))

  (if (and (member system %guixsd-supported-systems)

           ;; XXX: Our build farm has too few ARMv7 machines and they are very
           ;; slow, so skip system tests there.
           (not (string=? system "armhf-linux")))
      ;; Override the value of 'current-guix' used by system tests.  Using a
      ;; channel instance makes tests that rely on 'current-guix' less
      ;; expensive.  It also makes sure we get a valid Guix package when this
      ;; code is not running from a checkout.
      (parameterize ((current-guix-package
                      (channel-instance->package instance)))
        (map ->job (all-system-tests)))
      '()))

(define (tarball-jobs store system)
  "Return Hydra jobs to build the self-contained Guix binary tarball."
  (define (->alist drv)
    `((derivation . ,(derivation-file-name drv))
      (description . "Stand-alone binary Guix tarball")
      (long-description . "This is a tarball containing binaries of Guix and
all its dependencies, and ready to be installed on \"foreign\" distributions.")
      (license . ,(license-name gpl3+))
      (home-page . ,%guix-home-page-url)
      (maintainers . ("bug-guix@gnu.org"))))

  (define (->job name drv)
    (let ((name (symbol-append name (string->symbol ".")
                               (string->symbol system))))
      `(,name . ,(lambda ()
                   (parameterize ((%graft? #f))
                     (->alist drv))))))

  ;; XXX: Add a job for the stable Guix?
  (list (->job 'binary-tarball
               (run-with-store store
                 (mbegin %store-monad
                   (set-guile-for-build (default-guile))
                   (>>= (profile-derivation (packages->manifest (list guix)))
                        (lambda (profile)
                          (self-contained-tarball "guix-binary" profile
                                                  #:localstatedir? #t
                                                  #:compressor
                                                  (lookup-compressor "xz")))))
                 #:system system))))

(define job-name
  ;; Return the name of a package's job.
  (compose string->symbol
           (cut 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)
             (package-job store (symbol-append 'base. (job-name package))
                          package system))
            ((supported-package? package system)
             (let ((drv (package-derivation store package system
                                            #:graft? #f)))
               (and (substitutable-derivation? drv)
                    (package-job store (job-name package)
                                 package system))))
            (else
             #f)))))

(define (all-packages)
  "Return the list of packages to build."
  (define (adjust package result)
    (cond ((package-replacement package)
           (cons* package                         ;build both
                  (package-replacement package)
                  result))
          ((package-superseded package)
           result)                                ;don't build it
          (else
           (cons package result))))

  (fold-packages adjust
                 (fold adjust '()                 ;include base packages
                       (match (%final-inputs)
                         (((labels packages _ ...) ...)
                          packages)))
                 #:select? (const #t)))           ;include hidden packages

(define (arguments->manifests arguments)
  "Return the list of manifests extracted from ARGUMENTS."
  (map (match-lambda
         ((input-name . relative-path)
          (let* ((checkout (assq-ref arguments (string->symbol input-name)))
                 (base (assq-ref checkout 'file-name)))
            (in-vicinity base relative-path))))
       (assq-ref arguments 'manifests)))

(define (manifests->packages store manifests)
  "Return the list of packages found in MANIFESTS."
  (define (load-manifest manifest)
    (save-module-excursion
     (lambda ()
       (set-current-module (make-user-module '((guix profiles) (gnu))))
       (primitive-load manifest))))

  (delete-duplicates!
   (map manifest-entry-item
        (append-map (compose manifest-entries
                             load-manifest)
                    manifests))))


;;;
;;; Hydra entry point.
;;;

(define (hydra-jobs store arguments)
  "Return Hydra jobs."
  (define subset
    (match (assoc-ref arguments 'subset)
      ("core" 'core)                              ; only build core packages
      ("hello" 'hello)                            ; only build hello
      (((? string?) (? string?) ...) 'list)       ; only build selected list of packages
      ("manifests" 'manifests)                    ; only build packages in the list of manifests
      (_ 'all)))                                  ; build everything

  (define systems
    (match (assoc-ref arguments 'systems)
      (#f              %hydra-supported-systems)
      ((lst ...)       lst)
      ((? string? str) (call-with-input-string str read))))

  (define checkout
    ;; Extract metadata about the 'guix' checkout.  Its key in ARGUMENTS may
    ;; vary, so pick up the first one that's neither 'subset' nor 'systems'.
    (any (match-lambda
           ((key . value)
            (and (not (memq key '(systems subset)))
                 value)))
         arguments))

  (define commit
    (assq-ref checkout 'revision))

  (define source
    (assq-ref checkout 'file-name))

  (define (cross-jobs system)
    (define (from-32-to-64? target)
      ;; Return true if SYSTEM is 32-bit and TARGET is 64-bit.  This hack
      ;; prevents known-to-fail cross-builds from i686-linux or armhf-linux to
      ;; mips64el-linux-gnuabi64.
      (and (or (string-prefix? "i686-" system)
               (string-prefix? "i586-" system)
               (string-prefix? "armhf-" system))
           (string-contains target "64")))    ;x86_64, mips64el, aarch64, etc.

    (define (same? target)
      ;; Return true if SYSTEM and TARGET are the same thing.  This is so we
      ;; don't try to cross-compile to 'mips64el-linux-gnu' from
      ;; 'mips64el-linux'.
      (or (string-contains target system)
          (and (string-prefix? "armhf" system)    ;armhf-linux
               (string-prefix? "arm" target))))   ;arm-linux-gnueabihf

    (define (pointless? target)
      ;; Return #t if it makes no sense to cross-build to TARGET from SYSTEM.
      (match system
        ((or "x86_64-linux" "i686-linux")
         (if (string-contains target "mingw")
             (not (string=? "x86_64-linux" system))
             #f))
        (_
         ;; Don't try to cross-compile from non-Intel platforms: this isn't
         ;; very useful and these are often brittle configurations.
         #t)))

    (define (either proc1 proc2 proc3)
      (lambda (x)
        (or (proc1 x) (proc2 x) (proc3 x))))

    (append-map (lambda (target)
                  (map (lambda (package)
                         (package-cross-job store (job-name package)
                                            package target system))
                       %packages-to-cross-build))
                (remove (either from-32-to-64? same? pointless?)
                        %cross-targets)))

  ;; Turn off grafts.  Grafting is meant to happen on the user's machines.
  (parameterize ((%graft? #f))
    ;; Return one job for each package, except bootstrap packages.
    (append-map (lambda (system)
                  (format (current-error-port)
                          "evaluating for '~a' (heap size: ~a MiB)...~%"
                          system
                          (round
                           (/ (assoc-ref (gc-stats) 'heap-size)
                              (expt 2. 20))))
                  (invalidate-derivation-caches!)
                  (case subset
                    ((all)
                     ;; Build everything, including replacements.
                     (let ((all (all-packages))
                           (job (lambda (package)
                                  (package->job store package
                                                system))))
                       (append (filter-map job all)
                               (qemu-jobs store system)
                               (system-test-jobs store system
                                                 #:source source
                                                 #:commit commit)
                               (tarball-jobs store system)
                               (cross-jobs system))))
                    ((core)
                     ;; Build core packages only.
                     (append (map (lambda (package)
                                    (package-job store (job-name package)
                                                 package system))
                                  %core-packages)
                             (cross-jobs system)))
                    ((hello)
                     ;; Build hello package only.
                     (if (string=? system (%current-system))
                         (let ((hello (specification->package "hello")))
                           (list (package-job store (job-name hello) hello system)))
                         '()))
                    ((list)
                     ;; Build selected list of packages only.
                     (if (string=? system (%current-system))
                         (let* ((names (assoc-ref arguments 'subset))
                                (packages (map specification->package names)))
                           (map (lambda (package)
                                    (package-job store (job-name package)
                                                 package system))
                                  packages))
                         '()))
                    ((manifests)
                     ;; Build packages in the list of manifests.
                     (let* ((manifests (arguments->manifests arguments))
                            (packages (manifests->packages store manifests)))
                       (map (lambda (package)
                              (package-job store (job-name package)
                                           package system))
                            packages)))
                    (else
                     (error "unknown subset" subset))))
                systems)))