| 1 | ;;; GNU Guix --- Functional package management for GNU |
| 2 | ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> |
| 3 | ;;; |
| 4 | ;;; This file is part of GNU Guix. |
| 5 | ;;; |
| 6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it |
| 7 | ;;; under the terms of the GNU General Public License as published by |
| 8 | ;;; the Free Software Foundation; either version 3 of the License, or (at |
| 9 | ;;; your option) any later version. |
| 10 | ;;; |
| 11 | ;;; GNU Guix is distributed in the hope that it will be useful, but |
| 12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | ;;; GNU General Public License for more details. |
| 15 | ;;; |
| 16 | ;;; You should have received a copy of the GNU General Public License |
| 17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. |
| 18 | |
| 19 | (define-module (gnu build bootloader) |
| 20 | #:use-module (ice-9 binary-ports) |
| 21 | #:export (write-file-on-device)) |
| 22 | |
| 23 | \f |
| 24 | ;;; |
| 25 | ;;; Writing utils. |
| 26 | ;;; |
| 27 | |
| 28 | (define (write-file-on-device file size device offset) |
| 29 | "Write SIZE bytes from FILE to DEVICE starting at OFFSET." |
| 30 | (call-with-input-file file |
| 31 | (lambda (input) |
| 32 | (let ((bv (get-bytevector-n input size))) |
| 33 | (call-with-output-file device |
| 34 | (lambda (output) |
| 35 | (seek output offset SEEK_SET) |
| 36 | (put-bytevector output bv)) |
| 37 | #:binary #t))))) |