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diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 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 (guix scripts system)
+  #:use-module (guix ui)
+  #:use-module (guix store)
+  #:use-module (guix derivations)
+  #:use-module (guix packages)
+  #:use-module (guix utils)
+  #:use-module (guix monads)
+  #:use-module (guix scripts build)
+  #:use-module (gnu system vm)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-37)
+  #:use-module (ice-9 match)
+  #:export (guix-system))
+
+(define %user-module
+  ;; Module in which the machine description file is loaded.
+  (let ((module (make-fresh-user-module)))
+    (for-each (lambda (iface)
+                (module-use! module (resolve-interface iface)))
+              '((gnu system)
+                (gnu services)
+                (gnu system shadow)))
+    module))
+
+(define (read-operating-system file)
+  "Read the operating-system declaration from FILE and return it."
+  ;; TODO: Factorize.
+  (catch #t
+    (lambda ()
+      ;; Avoid ABI incompatibility with the <operating-system> record.
+      (set! %fresh-auto-compile #t)
+
+      (save-module-excursion
+       (lambda ()
+         (set-current-module %user-module)
+         (primitive-load file))))
+    (lambda args
+      (match args
+        (('system-error . _)
+         (let ((err (system-error-errno args)))
+           (leave (_ "failed to open operating system file '~a': ~a~%")
+                  file (strerror err))))
+        (_
+         (leave (_ "failed to load machine file '~a': ~s~%")
+                file args))))))
+
+
+;;;
+;;; Options.
+;;;
+
+(define (show-help)
+  (display (_ "Usage: guix system [OPTION] ACTION FILE
+Build the operating system declared in FILE according to ACTION.\n"))
+  (display (_ "Currently the only valid value for ACTION is 'vm', which builds
+a virtual machine of the given operating system.\n"))
+  (show-build-options-help)
+  (newline)
+  (display (_ "
+  -h, --help             display this help and exit"))
+  (display (_ "
+  -V, --version          display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+(define %options
+  ;; Specifications of the command-line options.
+  (cons* (option '(#\h "help") #f #f
+                 (lambda args
+                   (show-help)
+                   (exit 0)))
+         (option '(#\V "version") #f #f
+                 (lambda args
+                   (show-version-and-exit "guix system")))
+         (option '(#\n "dry-run") #f #f
+                 (lambda (opt name arg result)
+                   (alist-cons 'dry-run? #t result)))
+         %standard-build-options))
+
+(define %default-options
+  ;; Alist of default option values.
+  `((system . ,(%current-system))
+    (substitutes? . #t)
+    (build-hook? . #t)
+    (max-silent-time . 3600)
+    (verbosity . 0)))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-system . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold* args %options
+                (lambda (opt name arg result)
+                  (leave (_ "~A: unrecognized option~%") name))
+                (lambda (arg result)
+                  (if (assoc-ref result 'action)
+                      (let ((previous (assoc-ref result 'argument)))
+                        (if previous
+                            (leave (_ "~a: extraneous argument~%") previous)
+                            (alist-cons 'argument arg result)))
+                      (let ((action (string->symbol arg)))
+                        (case action
+                          ((vm) (alist-cons 'action action result))
+                          (else (leave (_ "~a: unknown action~%")
+                                       action))))))
+                %default-options))
+
+  (with-error-handling
+    (let* ((opts  (parse-options))
+           (file  (assoc-ref opts 'argument))
+           (os    (if file
+                      (read-operating-system file)
+                      (leave (_ "no configuration file specified~%"))))
+           (mdrv  (system-qemu-image/shared-store-script os))
+           (store (open-connection))
+           (dry?  (assoc-ref opts 'dry-run?))
+           (drv   (run-with-store store mdrv)))
+      (set-build-options-from-command-line store opts)
+      (show-what-to-build store (list drv)
+                          #:dry-run? dry?
+                          #:use-substitutes? (assoc-ref opts 'substitutes?))
+
+      (unless dry?
+        (build-derivations store (list drv))
+        (display (derivation->output-path drv))
+        (newline)))))