From 1ea507bce294d12223c35c3f8c2ae3e54a4127fd Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Sun, 17 Apr 2016 18:09:11 +0200
Subject: services: Move 'device-mapping-service' to (gnu system
 mapped-devices).

* gnu/services/base.scm (device-mapping-service-type)
(device-mapping-service): Move to...
* gnu/system/mapped-devices.scm (device-mapping-service-type):
(device-mapping-service): ... here.  New variables.
---
 gnu/system/mapped-devices.scm | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'gnu/system/mapped-devices.scm')

diff --git a/gnu/system/mapped-devices.scm b/gnu/system/mapped-devices.scm
index dd8e432688..be2d6a4749 100644
--- a/gnu/system/mapped-devices.scm
+++ b/gnu/system/mapped-devices.scm
@@ -19,7 +19,10 @@
 (define-module (gnu system mapped-devices)
   #:use-module (guix gexp)
   #:use-module (guix records)
+  #:use-module (gnu services)
+  #:use-module (gnu services shepherd)
   #:autoload   (gnu packages cryptsetup) (cryptsetup)
+  #:use-module (ice-9 match)
   #:export (mapped-device
             mapped-device?
             mapped-device-source
@@ -31,6 +34,9 @@
             mapped-device-kind-open
             mapped-device-kind-close
 
+            device-mapping-service-type
+            device-mapping-service
+
             luks-device-mapping))
 
 ;;; Commentary:
@@ -54,6 +60,31 @@
   (close     mapped-device-kind-close             ;source target -> gexp
              (default (const #~(const #f)))))
 
+
+;;;
+;;; Device mapping as a Shepherd service.
+;;;
+
+(define device-mapping-service-type
+  (shepherd-service-type
+   'device-mapping
+   (match-lambda
+     ((target open close)
+      (shepherd-service
+       (provision (list (symbol-append 'device-mapping- (string->symbol target))))
+       (requirement '(udev))
+       (documentation "Map a device node using Linux's device mapper.")
+       (start #~(lambda () #$open))
+       (stop #~(lambda _ (not #$close)))
+       (respawn? #f))))))
+
+(define (device-mapping-service target open close)
+  "Return a service that maps device @var{target}, a string such as
+@code{\"home\"} (meaning @code{/dev/mapper/home}).  Evaluate @var{open}, a
+gexp, to open it, and evaluate @var{close} to close it."
+  (service device-mapping-service-type
+           (list target open close)))
+
 
 ;;;
 ;;; Common device mappings.
-- 
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