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;;; 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 (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 popen)
#:use-module (ice-9 match)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 format)
#:export (write-file-on-device
invoke/quiet))
;;;
;;; 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)))))
(define-syntax-rule (G_ str) str) ;for xgettext
(define (open-pipe-with-stderr program . args)
"Run PROGRAM with ARGS in an input pipe, but, unlike 'open-pipe*', redirect
both its standard output and standard error to the pipe. Return two value:
the pipe to read PROGRAM's data from, and the PID of the child process running
PROGRAM."
;; 'open-pipe*' doesn't attempt to capture stderr in any way, which is why
;; we need to roll our own.
(match (pipe)
((input . output)
(match (primitive-fork)
(0
(dynamic-wind
(const #t)
(lambda ()
(close-port input)
(dup2 (fileno output) 1)
(dup2 (fileno output) 2)
(apply execlp program program args))
(lambda ()
(primitive-exit 127))))
(pid
(close-port output)
(values input pid))))))
;; TODO: Move to (guix build utils) on the next rebuild cycle.
(define (invoke/quiet program . args)
"Invoke PROGRAM with ARGS and capture PROGRAM's standard output and standard
error. If PROGRAM succeeds, print nothing and return the unspecified value;
otherwise, raise a '&message' error condition that includes the status code
and the output of PROGRAM."
(define-values (pipe pid)
(apply open-pipe-with-stderr program args))
(let loop ((lines '()))
(match (read-line pipe)
((? eof-object?)
(close-port pipe)
(match (waitpid pid)
((_ . status)
(unless (zero? status)
(raise (condition
(&message
(message (format #f (G_ "'~a~{ ~a~}' exited with status ~a; \
output follows:~%~%~{ ~a~%~}")
program args
(or (status:exit-val status)
status)
(reverse lines))))))))))
(line
(loop (cons line lines))))))
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