Add (gnu system install).

* gnu/system/install.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu-system.am

@@ -256,6 +256,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/system.scm				\
   gnu/system/file-systems.scm			\
   gnu/system/grub.scm				\
+  gnu/system/install.scm			\
   gnu/system/linux.scm				\
   gnu/system/linux-initrd.scm			\
   gnu/system/shadow.scm				\

gnu/system/install.scm

+;;; 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 (gnu system install)
+  #:use-module (gnu)
+  #:use-module (guix gexp)
+  #:use-module (guix monads)
+  #:use-module (gnu packages bash)
+  #:use-module (gnu packages less)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu packages admin)
+  #:use-module (gnu packages package-management)
+  #:use-module (gnu packages zile)
+  #:use-module (gnu packages parted)
+  #:use-module (gnu packages fdisk)
+  #:use-module (gnu packages texinfo)
+  #:export (installation-os))
+
+;;; Commentary:
+;;;
+;;; This module provides an 'operating-system' definition for use on images
+;;; for USB sticks etc., for the installation of the GNU system.
+;;;
+;;; Code:
+
+(define (log-to-info)
+  "Return a script that spawns the Info reader on the right section of the
+manual."
+  (gexp->script "log-to-info"
+                #~(execl (string-append #$texinfo-4 "/bin/info")
+                         "-d" "/run/current-system/profile/share/info"
+                         "-f" (string-append #$guix "/share/info/guix.info")
+                         "-n" "System Configuration")))
+
+(define (installation-services)
+  "Return the list services for the installation image."
+  (let ((motd (text-file "motd" "
+Welcome to the installation of the GNU operating system!
+
+There is NO WARRANTY, to the extent permitted by law.  In particular, you may
+LOSE ALL YOUR DATA as a side effect of the installation process.  Furthermore,
+it is alpha software, so it may BREAK IN UNEXPECTED WAYS.
+
+You have been warned.  Thanks for being so brave.
+")))
+    (define (normal-tty tty)
+      (mingetty-service tty
+                        #:motd motd
+                        #:auto-login "root"
+                        #:login-pause? #t))
+
+    (list (mingetty-service "tty1"
+                            #:motd motd
+                            #:auto-login "root")
+
+          ;; Documentation.
+          (mingetty-service "tty2"
+                            #:motd motd
+                            #:auto-login "guest"
+                            #:login-program (log-to-info))
+
+          ;; A bunch of 'root' ttys.
+          (normal-tty "tty3")
+          (normal-tty "tty4")
+          (normal-tty "tty5")
+          (normal-tty "tty6")
+
+          ;; The usual services.
+          (syslog-service)
+          (guix-service)
+          (nscd-service))))
+
+(define %issue
+  ;; Greeting.
+  "
+This is an installation image of the GNU system.  Welcome.
+
+Use Alt-F2 for documentation.
+")
+
+(define installation-os
+  ;; The operating system used on installation images for USB sticks etc.
+  (operating-system
+    (host-name "gnu")
+    (timezone "Europe/Paris")
+    (locale "en_US.UTF-8")
+    (bootloader (grub-configuration
+                 (device "/dev/sda")))
+    (file-systems
+     ;; Note: the disk image build code overrides this root file system with
+     ;; the appropriate one.
+     (list (file-system
+             (mount-point "/")
+             (device "gnu-disk-image")
+             (type "ext4"))))
+
+    (users (list (user-account
+                  (name "guest")
+                  (group "wheel")
+                  (password "")
+                  (comment "Guest of GNU")
+                  (home-directory "/home/guest"))))
+    (groups (list (user-group (name "root") (id 0))
+                  (user-group
+                   (name "wheel")
+                   (id 1)
+                   (members '("guest")))          ; allow 'guest' to use sudo
+                  (user-group
+                   (name "users")
+                   (id 100)
+                   (members '("guest")))))
+
+    (issue %issue)
+
+    (services (installation-services))
+
+    ;; We don't need setuid programs so pass the empty list so we don't pull
+    ;; additional programs here.
+    (setuid-programs '())
+
+    (pam-services
+     ;; Explicitly allow for empty passwords.
+     (base-pam-services #:allow-empty-passwords? #t))
+
+    (packages (list bash coreutils findutils grep sed
+                    procps psmisc less
+                    guile-2.0 dmd guix util-linux inetutils
+                    parted fdisk module-init-tools
+                    zile))))
+
+;; Return it here so 'guix system' can consume it directly.
+installation-os
+
+;;; install.scm ends here