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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 (guix utils)
#:use-module (guix records)
#:use-module (gnu system)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module ((gnu packages) #:select (scheme-modules))
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9 gnu)
#:use-module (ice-9 match)
#:export (marionette-service-type
marionette-operating-system
define-os-with-source
system-test
system-test?
system-test-name
system-test-value
system-test-description
system-test-location
fold-system-tests
all-system-tests))
;;; 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 backdoor.
(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)))))
(define-syntax define-os-with-source
(syntax-rules (use-modules operating-system)
"Define two variables: OS containing the given operating system, and
SOURCE containing the source to define OS as an sexp.
This is convenient when we need both the <operating-system> object so we can
instantiate it, and the source to create it so we can store in in a file in
the system under test."
((_ (os source)
(use-modules modules ...)
(operating-system fields ...))
(begin
(define os
(operating-system fields ...))
(define source
'(begin
(use-modules modules ...)
(operating-system fields ...)))))))
;;;
;;; Tests.
;;;
(define-record-type* <system-test> system-test make-system-test
system-test?
(name system-test-name) ;string
(value system-test-value) ;%STORE-MONAD value
(description system-test-description) ;string
(location system-test-location (innate) ;<location>
(default (and=> (current-source-location)
source-properties->location))))
(define (write-system-test test port)
(match test
(($ <system-test> name _ _ ($ <location> file line))
(format port "#<system-test ~a ~a:~a ~a>"
name file line
(number->string (object-address test) 16)))
(($ <system-test> name)
(format port "#<system-test ~a ~a>" name
(number->string (object-address test) 16)))))
(set-record-type-printer! <system-test> write-system-test)
(define (test-modules)
"Return the list of modules that define system tests."
(scheme-modules (dirname (search-path %load-path "guix.scm"))
"gnu/tests"))
(define (fold-system-tests proc seed)
"Invoke PROC on each system test, passing it the test and the previous
result."
(fold (lambda (module result)
(fold (lambda (thing result)
(if (system-test? thing)
(proc thing result)
result))
result
(module-map (lambda (sym var)
(false-if-exception (variable-ref var)))
module)))
'()
(test-modules)))
(define (all-system-tests)
"Return the list of system tests."
(reverse (fold-system-tests cons '())))
;;; tests.scm ends here
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