;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2017 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 build bootloader) #:use-module (ice-9 binary-ports) #:export (write-file-on-device)) ;;; ;;; Writing utils. ;;; (define (write-file-on-device file size device offset) "Write SIZE bytes from FILE to DEVICE starting at OFFSET." (call-with-input-file file (lambda (input) (let ((bv (get-bytevector-n input size))) (call-with-output-file device (lambda (output) (seek output offset SEEK_SET) (put-bytevector output bv)) #:binary #t)))))