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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Mathieu Lirzin <mthl@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 cuirass)
+  #:use-module (guix gexp)
+  #:use-module (guix records)
+  #:use-module (gnu packages admin)
+  #:autoload   (gnu packages ci) (cuirass)
+  #:use-module (gnu services)
+  #:use-module (gnu services base)
+  #:use-module (gnu services shepherd)
+  #:use-module (gnu system shadow)
+  #:export (<cuirass-configuration>
+            cuirass-configuration
+            cuirass-configuration?
+
+            cuirass-service-type
+            cuirass-service))
+
+;;;; Commentary:
+;;;
+;;; This module implements a service that to run instances of Cuirass, a
+;;; continuous integration tool.
+;;;
+;;;; Code:
+
+(define-record-type* <cuirass-configuration>
+  cuirass-configuration make-cuirass-configuration
+  cuirass-configuration?
+  (cache-directory  cuirass-configuration-cache-directory ;string (dir-name)
+                    (default ""))
+  (user             cuirass-configuration-user ;string
+                    (default "cuirass"))
+  (group            cuirass-configuration-group ;string
+                    (default "cuirass"))
+  (interval         cuirass-configuration-interval ;integer (seconds)
+                    (default 60))
+  (database         cuirass-configuration-database ;string (file-name)
+                    (default "/var/run/cuirass/cuirass.db"))
+  (specifications   cuirass-configuration-specifications ;string (file-name)
+                    (default ""))
+  (use-substitutes? cuirass-configuration-use-substitutes? ;boolean
+                    (default #f))
+  (one-shot?        cuirass-configuration-one-shot? ;boolean
+                    (default #f)))
+
+(define (cuirass-shepherd-service config)
+  "Return a <shepherd-service> for the Cuirass service with CONFIG."
+  (and
+   (cuirass-configuration? config)
+   (let ((cache-directory  (cuirass-configuration-cache-directory config))
+         (interval         (cuirass-configuration-interval config))
+         (database         (cuirass-configuration-database config))
+         (specifications   (cuirass-configuration-specifications config))
+         (use-substitutes? (cuirass-configuration-use-substitutes? config))
+         (one-shot?        (cuirass-configuration-one-shot? config)))
+     (list (shepherd-service
+            (documentation "Run Cuirass.")
+            (provision '(cuirass))
+            (requirement '(guix-daemon))
+            (start #~(make-forkexec-constructor
+                      (list (string-append #$cuirass "/bin/cuirass")
+                            #$@(if (string=? "" cache-directory)
+                                   '()
+                                   (list "--cache-directory" cache-directory))
+                            #$@(if (string=? "" specifications)
+                                   '()
+                                   (list "--specifications" specifications))
+                            "--database" #$database
+                            "--interval" #$(number->string interval)
+                            #$@(if use-substitutes? '("--use-substitutes") '())
+                            #$@(if one-shot? '("--one-shot") '()))))
+            (stop #~(make-kill-destructor)))))))
+
+(define (cuirass-account config)
+  "Return the user accounts and user groups for CONFIG."
+  (let ((cuirass-user  (cuirass-configuration-user config))
+        (cuirass-group (cuirass-configuration-group config)))
+    (list (user-group
+           (name cuirass-group)
+           (system? #t))
+          (user-account
+           (name cuirass-user)
+           (group cuirass-group)
+           (system? #t)
+           (comment "Cuirass privilege separation user")
+           (home-directory (string-append "/var/run/" cuirass-user))
+           (shell #~(string-append #$shadow "/sbin/nologin"))))))
+
+(define cuirass-service-type
+  (service-type
+   (name 'cuirass)
+   (extensions
+    (list
+     (service-extension shepherd-root-service-type cuirass-shepherd-service)
+     (service-extension account-service-type cuirass-account)))))
+
+(define* (cuirass-service #:key (config (cuirass-configuration)))
+  "Return a service that runs cuirass according to CONFIG."
+  (service cuirass-service-type config))