131 lines
5.3 KiB
Scheme
131 lines
5.3 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu tests)
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#:use-module (guix gexp)
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#:use-module (gnu system)
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#:use-module (gnu services)
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#:use-module (gnu services shepherd)
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#:export (marionette-service-type
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marionette-operating-system))
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;;; Commentary:
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;;;
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;;; This module provides the infrastructure to run operating system tests.
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;;; The most important part of that is tools to instrument the OS under test,
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;;; essentially allowing to run in a virtual machine controlled by the host
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;;; system--hence the name "marionette".
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;;;
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;;; Code:
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(define (marionette-shepherd-service imported-modules)
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"Return the Shepherd service for the marionette REPL"
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(define device
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"/dev/hvc0")
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(list (shepherd-service
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(provision '(marionette))
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(requirement '(udev)) ;so that DEVICE is available
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(modules '((ice-9 match)
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(srfi srfi-9 gnu)
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(guix build syscalls)
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(rnrs bytevectors)))
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(imported-modules `((guix build syscalls)
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,@imported-modules))
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(start
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#~(lambda ()
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(define (clear-echo termios)
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(set-field termios (termios-local-flags)
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(logand (lognot (local-flags ECHO))
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(termios-local-flags termios))))
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(define (self-quoting? x)
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(letrec-syntax ((one-of (syntax-rules ()
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((_) #f)
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((_ pred rest ...)
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(or (pred x)
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(one-of rest ...))))))
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(one-of symbol? string? pair? null? vector?
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bytevector? number? boolean?)))
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(match (primitive-fork)
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(0
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(dynamic-wind
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(const #t)
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(lambda ()
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(let* ((repl (open-file #$device "r+0"))
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(termios (tcgetattr (fileno repl)))
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(console (open-file "/dev/console" "r+0")))
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;; Don't echo input back.
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(tcsetattr (fileno repl) (tcsetattr-action TCSANOW)
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(clear-echo termios))
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;; Redirect output to the console.
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(close-fdes 1)
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(close-fdes 2)
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(dup2 (fileno console) 1)
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(dup2 (fileno console) 2)
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(close-port console)
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(display 'ready repl)
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(let loop ()
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(newline repl)
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(match (read repl)
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((? eof-object?)
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(primitive-exit 0))
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(expr
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(catch #t
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(lambda ()
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(let ((result (primitive-eval expr)))
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(write (if (self-quoting? result)
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result
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(object->string result))
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repl)))
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(lambda (key . args)
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(print-exception (current-error-port)
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(stack-ref (make-stack #t) 1)
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key args)
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(write #f repl)))))
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(loop))))
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(lambda ()
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(primitive-exit 1))))
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(pid
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pid))))
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(stop #~(make-kill-destructor)))))
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(define marionette-service-type
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;; This is the type of the "marionette" service, allowing a guest system to
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;; be manipulated from the host. This marionette REPL is essentially a
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;; universal backdoor.
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(service-type (name 'marionette-repl)
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(extensions
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(list (service-extension shepherd-root-service-type
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marionette-shepherd-service)))))
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(define* (marionette-operating-system os
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#:key (imported-modules '()))
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"Return a marionetteed variant of OS such that OS can be used as a marionette
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in a virtual machine--i.e., controlled from the host system."
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(operating-system
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(inherit os)
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(services (cons (service marionette-service-type imported-modules)
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(operating-system-user-services os)))))
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;;; tests.scm ends here
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