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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 final)
+ #:use-module (gnu installer newt page)
+ #:use-module (gnu installer steps)
+ #:use-module (gnu installer utils)
+ #:use-module (gnu services herd)
+ #:use-module (guix build utils)
+ #:export (install-system))
+
+(define (install-system)
+ "Start COW-STORE service on target directory and launch guix install command
+in a subshell."
+ (let ((install-command
+ (format #f "guix system init ~a ~a"
+ (%installer-configuration-file)
+ (%installer-target-dir))))
+ (mkdir-p (%installer-target-dir))
+ (start-service 'cow-store (list (%installer-target-dir)))
+ (false-if-exception (run-shell-command install-command))))