linux-initrd: Factorize cpio archive creation.
* 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.
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Ludovic Courtès
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e2f4b305d0
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fbb3555809
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@ -283,6 +283,7 @@ GNU_SYSTEM_MODULES = \
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gnu/build/file-systems.scm \
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gnu/build/install.scm \
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gnu/build/linux-boot.scm \
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gnu/build/linux-initrd.scm \
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gnu/build/vm.scm
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@ -0,0 +1,70 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014 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 linux-initrd)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 ftw)
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#:export (write-cpio-archive))
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;;; Commentary:
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;;;
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;;; Tools to create Linux initial RAM disks ("initrds"). Initrds are
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;;; essentially gzipped cpio archives, with a '/init' executable that the
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;;; kernel runs at boot time.
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;;;
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;;; Code:
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(define* (write-cpio-archive output directory
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#:key
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(compress? #t)
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(cpio "cpio") (gzip "gzip"))
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"Write a cpio archive containing DIRECTORY to file OUTPUT, using CPIO. When
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COMPRESS? is true, compress it using GZIP. On success, return OUTPUT."
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(let ((pipe (open-pipe* OPEN_WRITE cpio "-o" "-O" output
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"-H" "newc" "--null"
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"--no-absolute-filenames")))
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(define (print0 file)
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(format pipe "~a\0" file))
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;; Note: as per `ramfs-rootfs-initramfs.txt', always add directory entries
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;; before the files that are inside of it: "The Linux kernel cpio
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;; extractor won't create files in a directory that doesn't exist, so the
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;; directory entries must go before the files that go in those
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;; directories."
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;; XXX: Use a deterministic order.
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(file-system-fold (const #t)
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(lambda (file stat result) ; leaf
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(print0 file))
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(lambda (dir stat result) ; down
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(unless (string=? dir directory)
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(print0 dir)))
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(const #f) ; up
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(const #f) ; skip
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(const #f)
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#f
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directory)
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(and (zero? (close-pipe pipe))
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(or (not compress?)
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(and (zero? (system* gzip "--best" output))
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(rename-file (string-append output ".gz")
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output))
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output))))
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;;; linux-initrd.scm ends here
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@ -75,9 +75,10 @@ initrd."
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(mlet* %store-monad ((source (imported-modules modules))
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(compiled (compiled-modules modules)))
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(define builder
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;; TODO: Move most of this code to (gnu build linux-boot).
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;; TODO: Move most of this code to (gnu build linux-initrd).
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#~(begin
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(use-modules (guix build utils)
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(use-modules (gnu build linux-initrd)
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(guix build utils)
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(ice-9 pretty-print)
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(ice-9 popen)
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(ice-9 match)
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@ -87,9 +88,7 @@ initrd."
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(rnrs bytevectors)
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((system foreign) #:select (sizeof)))
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(let ((cpio (string-append #$cpio "/bin/cpio"))
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(gzip (string-append #$gzip "/bin/gzip"))
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(modules #$source)
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(let ((modules #$source)
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(gos #$compiled)
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(scm-dir (string-append "share/guile/" (effective-version)))
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(go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a"
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@ -162,39 +161,13 @@ initrd."
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(for-each (cut utime <> 0 0 0 0)
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(find-files "." ".*"))
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(system* cpio "--version")
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(let ((pipe (open-pipe* OPEN_WRITE cpio "-o"
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"-O" (string-append #$output "/initrd")
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"-H" "newc" "--null")))
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(define print0
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(let ((len (string-length "./")))
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(lambda (file)
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(format pipe "~a\0" (string-drop file len)))))
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;; Note: as per `ramfs-rootfs-initramfs.txt', always add
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;; directory entries before the files that are inside of it: "The
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;; Linux kernel cpio extractor won't create files in a directory
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;; that doesn't exist, so the directory entries must go before
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;; the files that go in those directories."
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(file-system-fold (const #t)
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(lambda (file stat result) ; leaf
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(print0 file))
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(lambda (dir stat result) ; down
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(unless (string=? dir ".")
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(print0 dir)))
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(const #f) ; up
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(const #f) ; skip
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(const #f)
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#f
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".")
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(and (zero? (close-pipe pipe))
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(with-directory-excursion #$output
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(and (zero? (system* gzip "--best" "initrd"))
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(rename-file "initrd.gz" "initrd")))))))))
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(write-cpio-archive (string-append #$output "/initrd") "."
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#:cpio (string-append #$cpio "/bin/cpio")
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#:gzip (string-append #$gzip "/bin/gzip"))))))
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(gexp->derivation name builder
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#:modules '((guix build utils)))))
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#:modules '((guix build utils)
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(gnu build linux-initrd)))))
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(define (file-system->spec fs)
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"Return a list corresponding to file-system FS that can be passed to the
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