;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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)))))
a href='/guix/commit/doc/images/shepherd-graph.dot?id=9520b2b16e242728ab9340047197389d6d2bc2fc'>commit</a><a href='/guix/diff/doc/images/shepherd-graph.dot?id=9520b2b16e242728ab9340047197389d6d2bc2fc'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/doc/images/shepherd-graph.dot'>
<input type='hidden' name='id' value='9520b2b16e242728ab9340047197389d6d2bc2fc'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=9520b2b16e242728ab9340047197389d6d2bc2fc'>root</a>/<a href='/guix/log/doc?id=9520b2b16e242728ab9340047197389d6d2bc2fc'>doc</a>/<a href='/guix/log/doc/images?id=9520b2b16e242728ab9340047197389d6d2bc2fc'>images</a>/<a href='/guix/log/doc/images/shepherd-graph.dot?id=9520b2b16e242728ab9340047197389d6d2bc2fc'>shepherd-graph.dot</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/doc/images/shepherd-graph.dot?id=9520b2b16e242728ab9340047197389d6d2bc2fc&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>