ce53253d1f
* gnu/build/marionette.scm (marionette-control): Update doc to correct the QEMU Info manual reference.
451 lines
17 KiB
Scheme
451 lines
17 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2016-2022 Ludovic Courtès <ludo@gnu.org>
|
||
;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
|
||
;;;
|
||
;;; 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 build marionette)
|
||
#:use-module (srfi srfi-9)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-64)
|
||
#:use-module (rnrs io ports)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 popen)
|
||
#:use-module (ice-9 regex)
|
||
#:export (marionette?
|
||
make-marionette
|
||
marionette-eval
|
||
wait-for-file
|
||
wait-for-tcp-port
|
||
wait-for-unix-socket
|
||
marionette-control
|
||
marionette-screen-text
|
||
wait-for-screen-text
|
||
%qwerty-us-keystrokes
|
||
marionette-type
|
||
|
||
system-test-runner
|
||
qemu-command))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Instrumentation tools for QEMU virtual machines (VMs). A "marionette" is
|
||
;;; essentially a VM (a QEMU instance) with its monitor connected to a
|
||
;;; Unix-domain socket, and with a REPL inside the guest listening on a
|
||
;;; virtual console, which is itself connected to the host via a Unix-domain
|
||
;;; socket--these are the marionette's strings, connecting it to the almighty
|
||
;;; puppeteer.
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define-record-type <marionette>
|
||
(marionette command pid monitor repl)
|
||
marionette?
|
||
(command marionette-command) ;list of strings
|
||
(pid marionette-pid) ;integer
|
||
(monitor marionette-monitor) ;port
|
||
(repl %marionette-repl)) ;promise of a port
|
||
|
||
(define-syntax-rule (marionette-repl marionette)
|
||
(force (%marionette-repl marionette)))
|
||
|
||
(define* (wait-for-monitor-prompt port #:key (quiet? #t))
|
||
"Read from PORT until we have seen all of QEMU's monitor prompt. When
|
||
QUIET? is false, the monitor's output is written to the current output port."
|
||
(define full-prompt
|
||
(string->list "(qemu) "))
|
||
|
||
(let loop ((prompt full-prompt)
|
||
(matches '())
|
||
(prefix '()))
|
||
(match prompt
|
||
(()
|
||
;; It's useful to set QUIET? so we don't display the echo of our own
|
||
;; commands.
|
||
(unless quiet?
|
||
(for-each (lambda (line)
|
||
(format #t "qemu monitor: ~a~%" line))
|
||
(string-tokenize (list->string (reverse prefix))
|
||
(char-set-complement (char-set #\newline))))))
|
||
((chr rest ...)
|
||
(let ((read (read-char port)))
|
||
(cond ((eqv? read chr)
|
||
(loop rest (cons read matches) prefix))
|
||
((eof-object? read)
|
||
(error "EOF while waiting for QEMU monitor prompt"
|
||
(list->string (reverse prefix))))
|
||
(else
|
||
(loop full-prompt
|
||
'()
|
||
(cons read (append matches prefix))))))))))
|
||
|
||
(define* (make-marionette command
|
||
#:key (socket-directory "/tmp") (timeout 20))
|
||
"Return a QEMU marionette--i.e., a virtual machine with open connections to the
|
||
QEMU monitor and to the guest's backdoor REPL."
|
||
(define (file->sockaddr file)
|
||
(make-socket-address AF_UNIX
|
||
(string-append socket-directory "/" file)))
|
||
|
||
(define extra-options
|
||
(list "-nographic"
|
||
"-monitor" (string-append "unix:" socket-directory "/monitor")
|
||
"-chardev" (string-append "socket,id=repl,path=" socket-directory
|
||
"/repl")
|
||
"-chardev" (string-append "socket,id=qga,server=on,wait=off,path="
|
||
socket-directory "/qemu-ga")
|
||
|
||
;; See
|
||
;; <http://www.linux-kvm.org/page/VMchannel_Requirements#Invocation>.
|
||
"-device" "virtio-serial"
|
||
"-device" "virtserialport,chardev=repl,name=org.gnu.guix.port.0"
|
||
"-device" "virtserialport,chardev=qga,name=org.qemu.guest_agent.0"))
|
||
|
||
(define (accept* port)
|
||
(match (select (list port) '() (list port) timeout)
|
||
(((port) () ())
|
||
(accept port))
|
||
(_
|
||
(error "timeout in 'accept'" port))))
|
||
|
||
(let ((monitor (socket AF_UNIX SOCK_STREAM 0))
|
||
(repl (socket AF_UNIX SOCK_STREAM 0)))
|
||
(bind monitor (file->sockaddr "monitor"))
|
||
(listen monitor 1)
|
||
(bind repl (file->sockaddr "repl"))
|
||
(listen repl 1)
|
||
|
||
(match (primitive-fork)
|
||
(0
|
||
(catch #t
|
||
(lambda ()
|
||
(close monitor)
|
||
(close repl)
|
||
(match command
|
||
((program . args)
|
||
(apply execl program program
|
||
(append args extra-options)))))
|
||
(lambda (key . args)
|
||
(print-exception (current-error-port)
|
||
(stack-ref (make-stack #t) 1)
|
||
key args)
|
||
(primitive-exit 1))))
|
||
(pid
|
||
(format #t "QEMU runs as PID ~a~%" pid)
|
||
|
||
(match (accept* monitor)
|
||
((monitor-conn . _)
|
||
(display "connected to QEMU's monitor\n")
|
||
(close-port monitor)
|
||
(wait-for-monitor-prompt monitor-conn)
|
||
(display "read QEMU monitor prompt\n")
|
||
|
||
(marionette (append command extra-options) pid
|
||
monitor-conn
|
||
|
||
;; The following 'accept' call connects immediately, but
|
||
;; we don't know whether the guest has connected until
|
||
;; we actually receive the 'ready' message.
|
||
(match (accept* repl)
|
||
((repl-conn . addr)
|
||
(display "connected to guest REPL\n")
|
||
(close-port repl)
|
||
;; Delay reception of the 'ready' message so that the
|
||
;; caller can already send monitor commands.
|
||
(delay
|
||
(match (read repl-conn)
|
||
('ready
|
||
(display "marionette is ready\n")
|
||
repl-conn))))))))))))
|
||
|
||
(define (marionette-eval exp marionette)
|
||
"Evaluate EXP in MARIONETTE's backdoor REPL. Return the result."
|
||
(match marionette
|
||
(($ <marionette> command pid monitor (= force repl))
|
||
(write exp repl)
|
||
(newline repl)
|
||
(read repl))))
|
||
|
||
(define* (wait-for-file file marionette
|
||
#:key (timeout 10) (read 'read))
|
||
"Wait until FILE exists in MARIONETTE; READ its content and return it. If
|
||
FILE has not shown up after TIMEOUT seconds, raise an error."
|
||
(match (marionette-eval
|
||
`(let loop ((i ,timeout))
|
||
(cond ((file-exists? ,file)
|
||
(cons 'success (call-with-input-file ,file ,read)))
|
||
((> i 0)
|
||
(sleep 1)
|
||
(loop (- i 1)))
|
||
(else
|
||
'failure)))
|
||
marionette)
|
||
(('success . result)
|
||
result)
|
||
('failure
|
||
(error "file didn't show up" file))))
|
||
|
||
(define* (wait-for-tcp-port port marionette
|
||
#:key
|
||
(timeout 20)
|
||
(address `(make-socket-address AF_INET
|
||
INADDR_LOOPBACK
|
||
,port)))
|
||
"Wait for up to TIMEOUT seconds for PORT to accept connections in
|
||
MARIONETTE. ADDRESS must be an expression that returns a socket address,
|
||
typically a call to 'make-socket-address'. Raise an error on failure."
|
||
;; Note: The 'connect' loop has to run within the guest because, when we
|
||
;; forward ports to the host, connecting to the host never raises
|
||
;; ECONNREFUSED.
|
||
(match (marionette-eval
|
||
`(let* ((address ,address)
|
||
(sock (socket (sockaddr:fam address) SOCK_STREAM 0)))
|
||
(let loop ((i 0))
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(connect sock address)
|
||
(close-port sock)
|
||
'success)
|
||
(lambda args
|
||
(if (< i ,timeout)
|
||
(begin
|
||
(sleep 1)
|
||
(loop (+ 1 i)))
|
||
(list 'failure address))))))
|
||
marionette)
|
||
('success #t)
|
||
(('failure address)
|
||
(error "nobody's listening on port"
|
||
(list (inet-ntop (sockaddr:fam address) (sockaddr:addr address))
|
||
(sockaddr:port address))))))
|
||
|
||
(define* (wait-for-unix-socket file-name marionette
|
||
#:key (timeout 20))
|
||
"Wait for up to TIMEOUT seconds for FILE-NAME, a Unix domain socket, to
|
||
accept connections in MARIONETTE. Raise an error on failure."
|
||
(match (marionette-eval
|
||
`(begin
|
||
(let ((sock (socket PF_UNIX SOCK_STREAM 0)))
|
||
(let loop ((i 0))
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(connect sock AF_UNIX ,file-name)
|
||
(close-port sock)
|
||
'success)
|
||
(lambda args
|
||
(if (< i ,timeout)
|
||
(begin
|
||
(sleep 1)
|
||
(loop (+ 1 i)))
|
||
'failure))))))
|
||
marionette)
|
||
('success #t)
|
||
('failure
|
||
(error "nobody's listening on unix domain socket" file-name))))
|
||
|
||
(define (marionette-control command marionette)
|
||
"Run COMMAND in the QEMU monitor of MARIONETTE. COMMAND is a string such as
|
||
\"sendkey ctrl-alt-f1\" or \"screendump foo.ppm\" (info \"(QEMU) QEMU
|
||
Monitor\")."
|
||
(match marionette
|
||
(($ <marionette> _ _ monitor)
|
||
(display command monitor)
|
||
(newline monitor)
|
||
;; The "quit" command terminates QEMU immediately, with no output.
|
||
(unless (string=? command "quit") (wait-for-monitor-prompt monitor)))))
|
||
|
||
(define* (marionette-screen-text marionette
|
||
#:key
|
||
(ocrad "ocrad"))
|
||
"Take a screenshot of MARIONETTE, perform optical character
|
||
recognition (OCR), and return the text read from the screen as a string. Do
|
||
this by invoking OCRAD (file name for GNU Ocrad's command)"
|
||
(define (random-file-name)
|
||
(string-append "/tmp/marionette-screenshot-"
|
||
(number->string (random (expt 2 32)) 16)
|
||
".ppm"))
|
||
|
||
(let ((image (random-file-name)))
|
||
(dynamic-wind
|
||
(const #t)
|
||
(lambda ()
|
||
(marionette-control (string-append "screendump " image)
|
||
marionette)
|
||
|
||
;; Tell Ocrad to invert the image colors (make it black on white) and
|
||
;; to scale the image up, which significantly improves the quality of
|
||
;; the result. In spite of this, be aware that OCR confuses "y" and
|
||
;; "V" and sometimes erroneously introduces white space.
|
||
(let* ((pipe (open-pipe* OPEN_READ ocrad
|
||
"-i" "-s" "10" image))
|
||
(text (get-string-all pipe)))
|
||
(unless (zero? (close-pipe pipe))
|
||
(error "'ocrad' failed" ocrad))
|
||
text))
|
||
(lambda ()
|
||
(false-if-exception (delete-file image))))))
|
||
|
||
(define* (wait-for-screen-text marionette predicate
|
||
#:key (timeout 30) (ocrad "ocrad"))
|
||
"Wait for TIMEOUT seconds or until the screen text on MARIONETTE matches
|
||
PREDICATE, whichever comes first. Raise an error when TIMEOUT is exceeded."
|
||
(define start
|
||
(car (gettimeofday)))
|
||
|
||
(define end
|
||
(+ start timeout))
|
||
|
||
(let loop ()
|
||
(if (> (car (gettimeofday)) end)
|
||
(error "'wait-for-screen-text' timeout" predicate)
|
||
(or (predicate (marionette-screen-text marionette #:ocrad ocrad))
|
||
(begin
|
||
(sleep 1)
|
||
(loop))))))
|
||
|
||
(define %qwerty-us-keystrokes
|
||
;; Maps "special" characters to their keystrokes.
|
||
'((#\newline . "ret")
|
||
(#\space . "spc")
|
||
(#\- . "minus")
|
||
(#\+ . "shift-equal")
|
||
(#\* . "shift-8")
|
||
(#\= . "equal")
|
||
(#\? . "shift-slash")
|
||
(#\[ . "bracket_left")
|
||
(#\] . "bracket_right")
|
||
(#\{ . "shift-bracket_left")
|
||
(#\} . "shift-bracket_right")
|
||
(#\( . "shift-9")
|
||
(#\) . "shift-0")
|
||
(#\/ . "slash")
|
||
(#\< . "shift-comma")
|
||
(#\> . "shift-dot")
|
||
(#\. . "dot")
|
||
(#\, . "comma")
|
||
(#\; . "semicolon")
|
||
(#\' . "apostrophe")
|
||
(#\" . "shift-apostrophe")
|
||
(#\` . "grave_accent")
|
||
(#\bs . "backspace")
|
||
(#\tab . "tab")))
|
||
|
||
(define (character->keystroke chr keystrokes)
|
||
"Return the keystroke for CHR according to the keyboard layout defined by
|
||
KEYSTROKES."
|
||
(if (char-set-contains? char-set:upper-case chr)
|
||
(string-append "shift-" (string (char-downcase chr)))
|
||
(or (assoc-ref keystrokes chr)
|
||
(string chr))))
|
||
|
||
(define* (string->keystroke-commands str
|
||
#:optional
|
||
(keystrokes
|
||
%qwerty-us-keystrokes))
|
||
"Return a list of QEMU monitor commands to send the keystrokes corresponding
|
||
to STR. KEYSTROKES is an alist specifying a mapping from characters to
|
||
keystrokes."
|
||
(string-fold-right (lambda (chr result)
|
||
(cons (string-append
|
||
"sendkey "
|
||
(character->keystroke chr keystrokes))
|
||
result))
|
||
'()
|
||
str))
|
||
|
||
(define* (marionette-type str marionette
|
||
#:key (keystrokes %qwerty-us-keystrokes))
|
||
"Type STR on MARIONETTE's keyboard, using the KEYSTROKES alist to map characters
|
||
to actual keystrokes."
|
||
(for-each (cut marionette-control <> marionette)
|
||
(string->keystroke-commands str keystrokes)))
|
||
|
||
|
||
;;;
|
||
;;; Test helper.
|
||
;;;
|
||
|
||
(define* (system-test-runner #:optional log-directory)
|
||
"Return a SRFI-64 test runner that calls 'exit' upon 'test-end'. When
|
||
LOG-DIRECTORY is specified, create log file within it."
|
||
(let ((runner (test-runner-simple)))
|
||
;; Log to a file under LOG-DIRECTORY.
|
||
(test-runner-on-group-begin! runner
|
||
(let ((on-begin (test-runner-on-group-begin runner)))
|
||
(lambda (runner suite-name count)
|
||
(when log-directory
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(mkdir log-directory))
|
||
(lambda args
|
||
(unless (= (system-error-errno args) EEXIST)
|
||
(apply throw args))))
|
||
(set! test-log-to-file
|
||
(string-append log-directory "/" suite-name ".log")))
|
||
(on-begin runner suite-name count))))
|
||
|
||
;; The default behavior on 'test-end' is to only write a line if the test
|
||
;; failed. Arrange to also write a line on success.
|
||
(test-runner-on-test-end! runner
|
||
(let ((on-end (test-runner-on-test-end runner)))
|
||
(lambda (runner)
|
||
(let* ((kind (test-result-ref runner 'result-kind))
|
||
(results (test-result-alist runner))
|
||
(test-name (assq-ref results 'test-name)))
|
||
(unless (memq kind '(fail xpass))
|
||
(format (current-output-port) "~a: ~a~%"
|
||
(string-upcase (symbol->string kind))
|
||
test-name)))
|
||
|
||
(on-end runner))))
|
||
|
||
;; On 'test-end', display test results and exit with zero if and only if
|
||
;; there were no test failures.
|
||
(test-runner-on-final! runner
|
||
(lambda (runner)
|
||
(let ((success? (= (test-runner-fail-count runner) 0)))
|
||
(test-on-final-simple runner)
|
||
|
||
(when (not success?)
|
||
(let* ((log-port (test-runner-aux-value runner))
|
||
(log-file (port-filename log-port)))
|
||
(format (current-error-port)
|
||
"\nTests failed, dumping log file '~a'.\n\n"
|
||
log-file)
|
||
|
||
;; At this point LOG-PORT is not closed yet; flush it.
|
||
(force-output log-port)
|
||
|
||
;; Brute force to avoid dependency on (guix build utils) for
|
||
;; 'dump-port'.
|
||
(let ((content (call-with-input-file log-file
|
||
get-bytevector-all)))
|
||
(put-bytevector (current-error-port) content))))
|
||
|
||
(exit success?))))
|
||
runner))
|
||
|
||
(define* (qemu-command #:optional (system %host-type))
|
||
"Return the default name of the QEMU command for SYSTEM."
|
||
(let ((cpu (substring system 0
|
||
(string-index system #\-))))
|
||
(string-append "qemu-system-"
|
||
(cond
|
||
((string-match "^i[3456]86$" cpu) "i386")
|
||
((string-match "armhf" cpu) "arm")
|
||
(else cpu)))))
|
||
|
||
;;; marionette.scm ends here
|