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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 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 tests)
+ #:use-module (guix gexp)
+ #:use-module (gnu system)
+ #:use-module (gnu services)
+ #:use-module (gnu services shepherd)
+ #:export (backdoor-service-type
+ marionette-operating-system))
+
+;;; Commentary:
+;;;
+;;; This module provides the infrastructure to run operating system tests.
+;;; The most important part of that is tools to instrument the OS under test,
+;;; essentially allowing to run in a virtual machine controlled by the host
+;;; system--hence the name "marionette".
+;;;
+;;; Code:
+
+(define (marionette-shepherd-service imported-modules)
+ "Return the Shepherd service for the marionette REPL"
+ (define device
+ "/dev/hvc0")
+
+ (list (shepherd-service
+ (provision '(marionette))
+ (requirement '(udev)) ;so that DEVICE is available
+ (modules '((ice-9 match)
+ (srfi srfi-9 gnu)
+ (guix build syscalls)
+ (rnrs bytevectors)))
+ (imported-modules `((guix build syscalls)
+ ,@imported-modules))
+ (start
+ #~(lambda ()
+ (define (clear-echo termios)
+ (set-field termios (termios-local-flags)
+ (logand (lognot (local-flags ECHO))
+ (termios-local-flags termios))))
+
+ (define (self-quoting? x)
+ (letrec-syntax ((one-of (syntax-rules ()
+ ((_) #f)
+ ((_ pred rest ...)
+ (or (pred x)
+ (one-of rest ...))))))
+ (one-of symbol? string? pair? null? vector?
+ bytevector? number? boolean?)))
+
+ (match (primitive-fork)
+ (0
+ (dynamic-wind
+ (const #t)
+ (lambda ()
+ (let* ((repl (open-file #$device "r+0"))
+ (termios (tcgetattr (fileno repl)))
+ (console (open-file "/dev/console" "r+0")))
+ ;; Don't echo input back.
+ (tcsetattr (fileno repl) (tcsetattr-action TCSANOW)
+ (clear-echo termios))
+
+ ;; Redirect output to the console.
+ (close-fdes 1)
+ (close-fdes 2)
+ (dup2 (fileno console) 1)
+ (dup2 (fileno console) 2)
+ (close-port console)
+
+ (display 'ready repl)
+ (let loop ()
+ (newline repl)
+
+ (match (read repl)
+ ((? eof-object?)
+ (primitive-exit 0))
+ (expr
+ (catch #t
+ (lambda ()
+ (let ((result (primitive-eval expr)))
+ (write (if (self-quoting? result)
+ result
+ (object->string result))
+ repl)))
+ (lambda (key . args)
+ (print-exception (current-error-port)
+ (stack-ref (make-stack #t) 1)
+ key args)
+ (write #f repl)))))
+ (loop))))
+ (lambda ()
+ (primitive-exit 1))))
+ (pid
+ pid))))
+ (stop #~(make-kill-destructor)))))
+
+(define marionette-service-type
+ ;; This is the type of the "marionette" service, allowing a guest system to
+ ;; be manipulated from the host. This marionette REPL is essentially a
+ ;; universal marionette.
+ (service-type (name 'marionette-repl)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ marionette-shepherd-service)))))
+
+(define* (marionette-operating-system os
+ #:key (imported-modules '()))
+ "Return a marionetteed variant of OS such that OS can be used as a marionette
+in a virtual machine--i.e., controlled from the host system."
+ (operating-system
+ (inherit os)
+ (services (cons (service marionette-service-type imported-modules)
+ (operating-system-user-services os)))))
+
+;;; tests.scm ends here