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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@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 installer record)
+  #:use-module (guix records)
+  #:use-module (srfi srfi-1)
+  #:export (<installer>
+            installer
+            make-installer
+            installer?
+            installer-name
+            installer-init
+            installer-exit
+            installer-exit-error
+            installer-final-page
+            installer-keymap-page
+            installer-locale-page
+            installer-menu-page
+            installer-network-page
+            installer-timezone-page
+            installer-hostname-page
+            installer-user-page
+            installer-partition-page
+            installer-services-page
+            installer-welcome-page))
+
+
+;;;
+;;; Installer record.
+;;;
+
+;; The <installer> record contains pages that will be run to prompt the user
+;; for the system configuration. The goal of the installer is to produce a
+;; complete <operating-system> record and install it.
+
+(define-record-type* <installer>
+  installer make-installer
+  installer?
+  ;; symbol
+  (name installer-name)
+  ;; procedure: void -> void
+  (init installer-init)
+  ;; procedure: void -> void
+  (exit installer-exit)
+  ;; procedure (key arguments) -> void
+  (exit-error installer-exit-error)
+  ;; procedure void -> void
+  (final-page installer-final-page)
+  ;; procedure (layouts) -> (list layout variant)
+  (keymap-page installer-keymap-page)
+  ;; procedure: (#:key supported-locales iso639-languages iso3166-territories)
+  ;; -> glibc-locale
+  (locale-page installer-locale-page)
+  ;; procedure: (steps) -> step-id
+  (menu-page installer-menu-page)
+  ;; procedure void -> void
+  (network-page installer-network-page)
+  ;; procedure (zonetab) -> posix-timezone
+  (timezone-page installer-timezone-page)
+  ;; procedure void -> void
+  (hostname-page installer-hostname-page)
+  ;; procedure void -> void
+  (user-page installer-user-page)
+  ;; procedure void -> void
+  (partition-page installer-partition-page)
+  ;; procedure void -> void
+  (services-page installer-services-page)
+  ;; procedure (logo) -> void
+  (welcome-page installer-welcome-page))