services: Add zerotier-one-service.

* nongnu/services/vpn.scm: Add new file, and implement the service.

Signed-off-by: Jonathan Brielmaier <jonathan.brielmaier@web.de>

nongnu/services/vpn.scm

@@ -0,0 +1,62 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Alexey Abramov <levenson@mmer.org>
+;;;
+;;; This file is not 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 (nongnu services vpn)
+  #:use-module (guix gexp)
+  #:use-module (gnu packages)
+  #:use-module (gnu services)
+  #:use-module (gnu services shepherd)
+  #:use-module (nongnu packages vpn)
+  #:export (zerotier-one-service))
+
+(define %zerotier-action-join
+  (shepherd-action
+   (name 'join)
+   (documentation "Join a network")
+   (procedure #~(lambda (running network)
+                  (let ((zerotier-cli (string-append #$zerotier "/sbin/zerotier-cli")))
+                    (invoke zerotier-cli "join" network))))))
+
+(define %zerotier-action-leave
+  (shepherd-action
+   (name 'leave)
+   (documentation "Leave a network")
+   (procedure #~(lambda (running network)
+                  (let ((zerotier-cli (string-append #$zerotier "/sbin/zerotier-cli")))
+                    (invoke zerotier-cli "leave" network))))))
+
+(define zerotier-one-shepherd-service
+  (lambda (config)
+    (list (shepherd-service
+           (documentation "ZeroTier One daemon.")
+           (provision '(zerotier-one))
+           (requirement '(networking))
+           (actions (list %zerotier-action-join
+                          %zerotier-action-leave))
+           (start #~(make-forkexec-constructor
+                     (list (string-append #$zerotier "/sbin/zerotier-one"))))
+           (stop #~(make-kill-destructor))))))
+
+(define zerotier-one-service-type
+  (service-type (name 'zerotier-one)
+                (extensions
+                 (list (service-extension shepherd-root-service-type
+                                          zerotier-one-shepherd-service)))))
+
+(define* (zerotier-one-service #:key (config (list)))
+  (service zerotier-one-service-type config))