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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
+;;;
+;;; 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 tests rsync)
+  #:use-module (gnu packages rsync)
+  #:use-module (gnu tests)
+  #:use-module (gnu system)
+  #:use-module (gnu system file-systems)
+  #:use-module (gnu system shadow)
+  #:use-module (gnu system vm)
+  #:use-module (gnu services)
+  #:use-module (gnu services rsync)
+  #:use-module (gnu services networking)
+  #:use-module (guix gexp)
+  #:use-module (guix store)
+  #:export (%test-rsync))
+
+(define* (run-rsync-test rsync-os #:optional (rsync-port 873))
+  "Run tests in %RSYNC-OS, which has rsync running and listening on
+PORT."
+  (define os
+    (marionette-operating-system
+     rsync-os
+     #:imported-modules '((gnu services herd)
+                          (guix combinators))))
+
+  (define vm
+    (virtual-machine
+     (operating-system os)
+     (port-forwardings '())))
+
+  (define test
+    (with-imported-modules '((gnu build marionette))
+      #~(begin
+          (use-modules (srfi srfi-11) (srfi srfi-64)
+                       (gnu build marionette))
+
+          (define marionette
+            (make-marionette (list #$vm)))
+
+          (mkdir #$output)
+          (chdir #$output)
+
+          (test-begin "rsync")
+
+          ;; Wait for rsync to be up and running.
+          (test-eq "service running"
+            'running!
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+                (start-service 'rsync)
+                'running!)
+             marionette))
+
+          ;; Make sure the PID file is created.
+          (test-assert "PID file"
+            (marionette-eval
+             '(file-exists? "/var/run/rsyncd/rsyncd.pid")
+             marionette))
+
+          (test-assert "Test file copied to share"
+            (marionette-eval
+             '(begin
+                (call-with-output-file "/tmp/input"
+                  (lambda (port)
+                    (display "test-file-contents\n" port)))
+                (zero?
+                 (system* "rsync" "/tmp/input"
+                          (string-append "rsync://localhost:"
+                                         (number->string #$rsync-port)
+                                         "/files/input"))))
+             marionette))
+
+          (test-equal "Test file correctly received from share"
+            "test-file-contents"
+            (marionette-eval
+             '(begin
+                (use-modules (ice-9 rdelim))
+                (zero?
+                 (system* "rsync"
+                          (string-append "rsync://localhost:"
+                                         (number->string #$rsync-port)
+                                         "/files/input")
+                          "/tmp/output"))
+                (call-with-input-file "/tmp/output"
+                  (lambda (port)
+                    (read-line port))))
+             marionette))
+
+          (test-end)
+          (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+  (gexp->derivation "rsync-test" test))
+
+(define* %rsync-os
+  ;; Return operating system under test.
+  (let ((base-os
+         (simple-operating-system
+          (dhcp-client-service)
+          (service rsync-service-type))))
+    (operating-system
+      (inherit base-os)
+      (packages (cons* rsync
+                       (operating-system-packages base-os))))))
+
+(define %test-rsync
+  (system-test
+   (name "rsync")
+   (description "Connect to a running RSYNC server.")
+   (value (run-rsync-test %rsync-os))))