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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014 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 (gnu services dmd)
+ #:use-module (guix monads)
+ #:use-module (gnu services)
+ #:use-module (ice-9 match)
+ #:use-module (srfi srfi-1)
+ #:export (dmd-configuration-file))
+
+;;; Commentary:
+;;;
+;;; Instantiating system services as a dmd configuration file.
+;;;
+;;; Code:
+
+(define (dmd-configuration-file services etc)
+ "Return the dmd configuration file for SERVICES, that initializes /etc from
+ETC (the name of a directory in the store) on startup."
+ (define config
+ `(begin
+ (use-modules (ice-9 ftw))
+
+ (register-services
+ ,@(map (lambda (service)
+ `(make <service>
+ #:docstring ',(service-documentation service)
+ #:provides ',(service-provision service)
+ #:requires ',(service-requirement service)
+ #:respawn? ',(service-respawn? service)
+ #:start ,(service-start service)
+ #:stop ,(service-stop service)))
+ services))
+
+ ;; /etc is a mixture of static and dynamic settings. Here is where we
+ ;; initialize it from the static part.
+ (format #t "populating /etc from ~a...~%" ,etc)
+ (let ((rm-f (lambda (f)
+ (false-if-exception (delete-file f)))))
+ (rm-f "/etc/static")
+ (symlink ,etc "/etc/static")
+ (for-each (lambda (file)
+ ;; TODO: Handle 'shadow' specially so that changed
+ ;; password aren't lost.
+ (let ((target (string-append "/etc/" file))
+ (source (string-append "/etc/static/" file)))
+ (rm-f target)
+ (symlink source target)))
+ (scandir ,etc
+ (lambda (file)
+ (not (member file '("." ".."))))))
+
+ ;; Prevent ETC from being GC'd.
+ (rm-f "/var/nix/gcroots/etc-directory")
+ (symlink ,etc "/var/nix/gcroots/etc-directory"))
+
+ (format #t "starting services...~%")
+ (for-each start ',(append-map service-provision services))))
+
+ (text-file "dmd.conf" (object->string config)))
+
+;;; dmd.scm ends here