;;; 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))))))