71 lines
2.8 KiB
Scheme
71 lines
2.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
|
;;; Copyright © 2013, 2014 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 linux-initrd)
|
|
#:use-module (ice-9 popen)
|
|
#:use-module (ice-9 ftw)
|
|
#:export (write-cpio-archive))
|
|
|
|
;;; Commentary:
|
|
;;;
|
|
;;; Tools to create Linux initial RAM disks ("initrds"). Initrds are
|
|
;;; essentially gzipped cpio archives, with a '/init' executable that the
|
|
;;; kernel runs at boot time.
|
|
;;;
|
|
;;; Code:
|
|
|
|
(define* (write-cpio-archive output directory
|
|
#:key
|
|
(compress? #t)
|
|
(cpio "cpio") (gzip "gzip"))
|
|
"Write a cpio archive containing DIRECTORY to file OUTPUT, using CPIO. When
|
|
COMPRESS? is true, compress it using GZIP. On success, return OUTPUT."
|
|
(let ((pipe (open-pipe* OPEN_WRITE cpio "-o" "-O" output
|
|
"-H" "newc" "--null"
|
|
"--no-absolute-filenames")))
|
|
(define (print0 file)
|
|
(format pipe "~a\0" file))
|
|
|
|
;; Note: as per `ramfs-rootfs-initramfs.txt', always add directory entries
|
|
;; before the files that are inside of it: "The Linux kernel cpio
|
|
;; extractor won't create files in a directory that doesn't exist, so the
|
|
;; directory entries must go before the files that go in those
|
|
;; directories."
|
|
|
|
;; XXX: Use a deterministic order.
|
|
(file-system-fold (const #t)
|
|
(lambda (file stat result) ; leaf
|
|
(print0 file))
|
|
(lambda (dir stat result) ; down
|
|
(unless (string=? dir directory)
|
|
(print0 dir)))
|
|
(const #f) ; up
|
|
(const #f) ; skip
|
|
(const #f)
|
|
#f
|
|
directory)
|
|
|
|
(and (zero? (close-pipe pipe))
|
|
(or (not compress?)
|
|
(and (zero? (system* gzip "--best" output))
|
|
(rename-file (string-append output ".gz")
|
|
output))
|
|
output))))
|
|
|
|
;;; linux-initrd.scm ends here
|