maint: Move examples from 'tests' to 'examples' directory.

* examples/gnu-system.scm: Moved from 'tests' directory.
* examples/guix-jobs.scm: Likewise.
* examples/guix-track-git.scm: Likewise.
* examples/hello-git.scm: Likewise.
* examples/hello-singleton.scm: Likewise.
* examples/hello-subset.scm: Likewise.
* Makefile.am (EXTRA_DIST): Adapt.
* README <Example>: Likewise.

1 files changed, 231 insertions, 0 deletions

diff --git a/examples/gnu-system.scm b/examples/gnu-system.scm
new file mode 100644
index 0000000..8e29fec
--- /dev/null
+++ b/examples/gnu-system.scm
@@ -0,0 +1,231 @@
+;;;; 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 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."
+  (λ ()
+    `((#: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 (package-cross-job store job-name package target system)
+  "Return a job called TARGET.JOB-NAME that cross-builds PACKAGE
+for TARGET on SYSTEM."
+  (λ ()
+    `((#:job-name . ,(string-join (list target (symbol->string job-name) system)
+                                  "."))
+      (#:derivation . ,(derivation-file-name
+                        (parameterize ((%graft? #f))
+                          (package-cross-derivation store package target system
+                                                    #:graft? #f))))
+      ,@(package-metadata package))))
+
+(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.)
+  (append (map specification->package
+               '("gcc@4.8" "gcc@4.9" "gcc@5" "glibc" "binutils"
+                 "gmp" "mpfr" "mpc" "coreutils" "findutils" "diffutils" "patch" "sed" "grep"
+                 "gawk" "gettext" "hello" "zlib" "gzip" "xz"))
+          (list guile-2.0
+                %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"))
+
+(define (tarball-job store system)
+  "Return Hydra jobs to build the self-contained Guix binary tarball."
+  (λ ()
+    `((#:job-name . (string-append "binary-tarball." system))
+      (#:derivation . ,(derivation-file-name
+                        (parameterize ((%graft? #f))
+                          (run-with-store store
+                            (mbegin %store-monad
+                              (set-guile-for-build (default-guile))
+                              (self-contained-tarball))
+                            #:system system))))
+      (#: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 non-GuixSD
+distributions.")
+      (#:license . ,(license->alist gpl3+))
+      (#:home-page . ,%guix-home-page-url)
+      (#:maintainers . ("bug-guix@gnu.org")))))
+
+(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)))))
+
+
+;;;
+;;; 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
+      (_ 'all)))                        ; build everything
+
+  (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? "armhf-" system))
+           (string-suffix? "64" target)))
+
+    (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'.
+      (string-contains target system))
+
+    (define (either proc1 proc2)
+      (lambda (x)
+        (or (proc1 x) (proc2 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?) %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)
+                  (case subset
+                    ((all)
+                     ;; Build everything, including replacements.
+                     (let ((pkgs (fold-packages
+                                  (lambda (package result)
+                                    (if (package-replacement package)
+                                        (cons* package
+                                               (package-replacement package)
+                                               result)
+                                        (cons package result)))
+                                  '())))
+                       (append (filter-map (lambda (pkg)
+                                             (package->job store pkg system))
+                                           pkgs)
+                               (list (tarball-job 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)))
+                         '()))
+                    (else
+                     (error "unknown subset" subset))))
+                %hydra-supported-systems)))