38 lines
1.3 KiB
Scheme
38 lines
1.3 KiB
Scheme
;;; 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)))))
|