gnu: Add debian-archive-keyring.

* gnu/packages/debian.scm (debian-archive-keyring): New variable.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

gnu/local.mk

@@ -120,6 +120,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/datastructures.scm		\
   %D%/packages/dav.scm				\
   %D%/packages/dc.scm				\
+  %D%/packages/debian.scm			\
   %D%/packages/debug.scm			\
   %D%/packages/dejagnu.scm			\
   %D%/packages/dico.scm				\

gnu/packages/debian.scm

@@ -0,0 +1,62 @@
+;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
+;;;
+;;; 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 debian)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages gnupg))
+
+(define-public debian-archive-keyring
+  (package
+    (name "debian-archive-keyring")
+    (version "2017.7")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (string-append "mirror://debian/pool/main/d/" name "/"
+                            name "_" version ".tar.xz"))
+        (sha256
+         (base32
+          "1pdwgipfi0y4svhxlw8arhq792f1g3vlmw4raphizy7sa65vd4ca"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:test-target "verify-results"
+       #:parallel-build? #f ; has race conditions
+       #:phases
+       (modify-phases %standard-phases
+         (delete 'configure) ; no configure script
+         (replace 'install
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (apt (string-append out "/etc/apt/trusted.gpg.d/"))
+                    (key (string-append out "/share/keyrings/")))
+               (install-file "keyrings/debian-archive-keyring.gpg" key)
+               (install-file "keyrings/debian-archive-removed-keys.gpg" key)
+               (for-each (lambda (file)
+                           (install-file file apt))
+                         (find-files "trusted.gpg" "\\.gpg$")))
+             #t)))))
+    (native-inputs
+     `(("gnupg" ,gnupg)
+       ("jetring" ,jetring)))
+    (home-page "https://packages.qa.debian.org/d/debian-archive-keyring.html")
+    (synopsis "GnuPG archive keys of the Debian archive")
+    (description
+     "The Debian project digitally signs its Release files.  This package
+contains the archive keys used for that.")
+    (license (list license:public-domain ; the keys
+                   license:gpl2+)))) ; see debian/copyright