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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
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