build-system/gnu: Add `dist-package'.

* guix/build/gnu-dist.scm: New file.
* Makefile.am (MODULES): Add it.
* guix/build-system/gnu.scm (%default-modules): New variable.
  (gnu-build): Use it.
  (dist-package): New procedure.

Makefile.am

@@ -60,6 +60,7 @@ MODULES =					\
   guix/build/download.scm			\
   guix/build/cmake-build-system.scm		\
   guix/build/gnu-build-system.scm		\
+  guix/build/gnu-dist.scm			\
   guix/build/perl-build-system.scm		\
   guix/build/python-build-system.scm		\
   guix/build/utils.scm				\

guix/build-system/gnu.scm

@@ -32,7 +32,8 @@
             package-with-explicit-inputs
             package-with-extra-configure-variable
             static-libgcc-package
-            static-package))
+            static-package
+            dist-package))
 
 ;; Commentary:
 ;;
@@ -41,6 +42,11 @@
 ;;
 ;; Code:
 
+(define %default-modules
+  ;; Build-side modules imported and used by default.
+  '((guix build gnu-build-system)
+    (guix build utils)))
+
 (define* (package-with-explicit-inputs p inputs
                                        #:optional
                                        (loc (current-source-location))
@@ -152,6 +158,38 @@ use `--strip-all' as the arguments to `strip'."
               ''("--strip-all")
               flags)))))))
 
+(define* (dist-package p source)
+  "Return a package that runs takes source files from the SOURCE directory,
+runs `make distcheck' and whose result is one or more source tarballs."
+  (let ((s source))
+    (package (inherit p)
+      (name (string-append (package-name p) "-dist"))
+      (source s)
+      (arguments
+       ;; Use the right phases and modules.
+       (let* ((args (default-keyword-arguments (package-arguments p)
+                      `(#:phases #f
+                        #:modules ,%default-modules
+                        #:imported-modules ,%default-modules))))
+         (substitute-keyword-arguments args
+           ((#:modules modules)
+            `((guix build gnu-dist)
+              ,@modules))
+           ((#:imported-modules modules)
+            `((guix build gnu-dist)
+              ,@modules))
+           ((#:phases _)
+            '%dist-phases))))
+      (native-inputs
+       ;; Add autotools & co. as inputs.
+       (let ((ref (lambda (module var)
+                    (module-ref (resolve-interface module) var))))
+         `(("autoconf" ,(ref '(gnu packages autotools) 'autoconf))
+           ("automake" ,(ref '(gnu packages autotools) 'automake))
+           ("libtool"  ,(ref '(gnu packages autotools) 'libtool) "bin")
+           ("gettext"  ,(ref '(gnu packages gettext) 'gettext))
+           ("texinfo"  ,(ref '(gnu packages texinfo) 'texinfo))))))))
+
 
 (define %store
   ;; Store passed to STANDARD-INPUTS.
@@ -227,10 +265,8 @@ System: GCC, GNU Make, Bash, Coreutils, etc."
                     (phases '%standard-phases)
                     (system (%current-system))
                     (implicit-inputs? #t)    ; useful when bootstrapping
-                    (imported-modules '((guix build gnu-build-system)
-                                        (guix build utils)))
-                    (modules '((guix build gnu-build-system)
-                               (guix build utils))))
+                    (imported-modules %default-modules)
+                    (modules %default-modules))
   "Return a derivation called NAME that builds from tarball SOURCE, with
 input derivation INPUTS, using the usual procedure of the GNU Build
 System.  The builder is run with GUILE, or with the distro's final Guile

guix/build/gnu-dist.scm

@@ -0,0 +1,95 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 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/>.
+
+(define-module (guix build gnu-dist)
+  #:use-module (guix build utils)
+  #:use-module (guix build gnu-build-system)
+  #:use-module (srfi srfi-1)
+  #:export (%dist-phases))
+
+;;; Commentary:
+;;;
+;;; Build phases to build a source tarball with the GNU build system, as with
+;;; "make distcheck".
+;;;
+;;; Code:
+
+(define* (copy-source #:key source #:allow-other-keys)
+  (copy-recursively source "."))
+
+(define* (autoreconf #:rest args)
+  (letrec-syntax ((try-files (syntax-rules (else)
+                               ((_ (else fallback ...))
+                                (begin fallback ...))
+                               ((_ file files ... (else fallback ...))
+                                (if (file-exists? file)
+                                    (begin
+                                      (format #t "bootstrapping with `~a'...~%"
+                                              file)
+                                      (zero?
+                                       (system* (string-append "./" file))))
+                                    (try-files files ...
+                                               (else fallback ...)))))))
+    (try-files "bootstrap" "bootstrap.sh" "autogen" "autogen.sh"
+               (else
+                (format #t "bootstrapping with `autoreconf'...~%")
+                (zero? (system* "autoreconf" "-vfi"))))))
+
+(define* (build #:key build-before-dist? make-flags (dist-target "distcheck")
+                #:allow-other-keys
+                #:rest args)
+  (and (or (not build-before-dist?)
+           (let ((build (assq-ref %standard-phases 'build)))
+             (apply build args)))
+       (begin
+         (format #t "building target `~a'~%" dist-target)
+         (zero? (apply system* "make" dist-target make-flags)))))
+
+(define* (install-dist #:key outputs #:allow-other-keys)
+  (let* ((out      (assoc-ref outputs "out"))
+         (meta     (string-append out "/nix-support")) ; Hydra meta-data
+         (tarballs (find-files "." "\\.tar\\.")))
+    (mkdir out)
+    (for-each (lambda (tarball)
+                (copy-file tarball (string-append out "/" tarball)))
+              out)
+
+    (mkdir meta)
+    (call-with-output-file (string-append out "/hydra-build-products")
+      (lambda (port)
+        (for-each (lambda (tarball)
+                    ;; This tells Hydra's what kind of build products we have,
+                    ;; so it can represent them nicely.  See `product-list.tt'
+                    ;; in Hydra for details.
+                    (format port "file source-dist ~a/~a~%" out tarball))
+                  tarballs)))
+    #t))
+
+(define %dist-phases
+  ;; Phases for building a source tarball.
+  (alist-replace
+   'unpack copy-source
+   (alist-cons-before
+    'configure 'autoreconf autoreconf
+    (alist-replace
+     'build build
+     (alist-replace
+      'install install-dist
+      (alist-delete 'strip %standard-phases))))))
+
+;;; gnu-dist.scm ends here