Add (guix gnu-maintenance).

* guix/gnu-maintenance.scm: New file.
* Makefile.am (MODULES): Add it.

Makefile.am

@@ -27,6 +27,7 @@ MODULES =					\
   guix/utils.scm				\
   guix/derivations.scm				\
   guix/download.scm				\
+  guix/gnu-maintenance.scm			\
   guix/build-system.scm				\
   guix/build-system/gnu.scm			\
   guix/build-system/trivial.scm			\

guix/gnu-maintenance.scm

+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Nikita Karetnikov <nikita@karetnikov.org>
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; 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.
+;;;
+;;; 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 Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix gnu-maintenance)
+  #:use-module (web uri)
+  #:use-module (web client)
+  #:use-module (web response)
+  #:use-module (ice-9 regex)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-26)
+  #:export (official-gnu-packages))
+
+(define (http-fetch uri)
+  "Return a string containing the textual data at URI, a string."
+  (let*-values (((resp data)
+                (http-get (string->uri uri)))
+               ((code)
+                (response-code resp)))
+    (case code
+      ((200)
+       data)
+      (else
+       (error "download failed:" uri code
+              (response-reason-phrase resp))))))
+
+(define %package-list-url
+  (string-append "http://cvs.savannah.gnu.org/"
+                 "viewvc/*checkout*/gnumaint/"
+                 "gnupackages.txt?root=womb"))
+
+(define (official-gnu-packages)
+  "Return a list of GNU packages."
+  (define %package-line-rx
+    (make-regexp "^package: (.+)$"))
+
+  (let ((lst (string-split (http-fetch %package-list-url) #\nl)))
+    (filter-map (lambda (line)
+                  (and=> (regexp-exec %package-line-rx line)
+                         (cut match:substring <> 1)))
+                lst)))