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linux-initrd: Factorize cpio archive creation.

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* gnu/build/linux-initrd.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system/linux-initrd.scm (expression->initrd): Use (gnu build
  linux-initrd) and 'write-cpio-archive' instead of the inlined code.
This commit is contained in:
Ludovic Courtès 2014-09-03 15:13:44 +02:00
parent e2f4b305d0
commit fbb3555809
3 changed files with 80 additions and 36 deletions
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1
gnu-system.am
View file

@ -283,6 +283,7 @@ GNU_SYSTEM_MODULES = \
gnu/build/file-systems.scm \
gnu/build/install.scm \
gnu/build/linux-boot.scm \
gnu/build/linux-initrd.scm \
gnu/build/vm.scm

70
gnu/build/linux-initrd.scm Normal file
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@ -0,0 +1,70 @@
;;; 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

45
gnu/system/linux-initrd.scm
View file

@ -75,9 +75,10 @@ (define (string->regexp str)
(mlet* %store-monad ((source (imported-modules modules))
(compiled (compiled-modules modules)))
(define builder
;; TODO: Move most of this code to (gnu build linux-boot).
;; TODO: Move most of this code to (gnu build linux-initrd).
#~(begin
(use-modules (guix build utils)
(use-modules (gnu build linux-initrd)
(guix build utils)
(ice-9 pretty-print)
(ice-9 popen)
(ice-9 match)
@ -87,9 +88,7 @@ (define builder
(rnrs bytevectors)
((system foreign) #:select (sizeof)))
(let ((cpio (string-append #$cpio "/bin/cpio"))
(gzip (string-append #$gzip "/bin/gzip"))
(modules #$source)
(let ((modules #$source)
(gos #$compiled)
(scm-dir (string-append "share/guile/" (effective-version)))
(go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a"
@ -162,39 +161,13 @@ (define builder
(for-each (cut utime <> 0 0 0 0)
(find-files "." ".*"))
(system* cpio "--version")
(let ((pipe (open-pipe* OPEN_WRITE cpio "-o"
"-O" (string-append #$output "/initrd")
"-H" "newc" "--null")))
(define print0
(let ((len (string-length "./")))
(lambda (file)
(format pipe "~a\0" (string-drop file len)))))
;; 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."
(file-system-fold (const #t)
(lambda (file stat result) ; leaf
(print0 file))
(lambda (dir stat result) ; down
(unless (string=? dir ".")
(print0 dir)))
(const #f) ; up
(const #f) ; skip
(const #f)
#f
".")
(and (zero? (close-pipe pipe))
(with-directory-excursion #$output
(and (zero? (system* gzip "--best" "initrd"))
(rename-file "initrd.gz" "initrd")))))))))
(write-cpio-archive (string-append #$output "/initrd") "."
#:cpio (string-append #$cpio "/bin/cpio")
#:gzip (string-append #$gzip "/bin/gzip"))))))
(gexp->derivation name builder
#:modules '((guix build utils)))))
#:modules '((guix build utils)
(gnu build linux-initrd)))))
(define (file-system->spec fs)
"Return a list corresponding to file-system FS that can be passed to the