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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
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