99 lines
3.5 KiB
Scheme
99 lines
3.5 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu build bootloader)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (ice-9 binary-ports)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 format)
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#:export (write-file-on-device
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invoke/quiet))
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;;;
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;;; Writing utils.
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;;;
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(define (write-file-on-device file size device offset)
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"Write SIZE bytes from FILE to DEVICE starting at OFFSET."
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(call-with-input-file file
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(lambda (input)
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(let ((bv (get-bytevector-n input size)))
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(call-with-output-file device
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(lambda (output)
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(seek output offset SEEK_SET)
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(put-bytevector output bv))
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#:binary #t)))))
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(define-syntax-rule (G_ str) str) ;for xgettext
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(define (open-pipe-with-stderr program . args)
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"Run PROGRAM with ARGS in an input pipe, but, unlike 'open-pipe*', redirect
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both its standard output and standard error to the pipe. Return two value:
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the pipe to read PROGRAM's data from, and the PID of the child process running
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PROGRAM."
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;; 'open-pipe*' doesn't attempt to capture stderr in any way, which is why
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;; we need to roll our own.
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(match (pipe)
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((input . output)
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(match (primitive-fork)
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(0
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(dynamic-wind
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(const #t)
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(lambda ()
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(close-port input)
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(dup2 (fileno output) 1)
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(dup2 (fileno output) 2)
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(apply execlp program program args))
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(lambda ()
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(primitive-exit 127))))
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(pid
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(close-port output)
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(values input pid))))))
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;; TODO: Move to (guix build utils) on the next rebuild cycle.
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(define (invoke/quiet program . args)
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"Invoke PROGRAM with ARGS and capture PROGRAM's standard output and standard
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error. If PROGRAM succeeds, print nothing and return the unspecified value;
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otherwise, raise a '&message' error condition that includes the status code
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and the output of PROGRAM."
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(define-values (pipe pid)
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(apply open-pipe-with-stderr program args))
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(let loop ((lines '()))
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(match (read-line pipe)
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((? eof-object?)
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(close-port pipe)
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(match (waitpid pid)
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((_ . status)
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(unless (zero? status)
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(raise (condition
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(&message
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(message (format #f (G_ "'~a~{ ~a~}' exited with status ~a; \
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output follows:~%~%~{ ~a~%~}")
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program args
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(or (status:exit-val status)
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status)
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(reverse lines))))))))))
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(line
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(loop (cons line lines))))))
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