diff options
| -rw-r--r-- | gnu-system.am | 1 | ||||
| -rw-r--r-- | gnu/build/linux-initrd.scm | 70 | ||||
| -rw-r--r-- | gnu/system/linux-initrd.scm | 45 |
3 files changed, 80 insertions, 36 deletions
diff --git a/gnu-system.am b/gnu-system.am index d4f27314c2..9328d13083 100644 --- a/gnu-system.am +++ b/gnu-system.am @@ -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 diff --git a/gnu/build/linux-initrd.scm b/gnu/build/linux-initrd.scm new file mode 100644 index 0000000000..8caeba8722 --- /dev/null +++ b/gnu/build/linux-initrd.scm @@ -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 diff --git a/gnu/system/linux-initrd.scm b/gnu/system/linux-initrd.scm index c4ab73ec9a..bdee28c961 100644 --- a/gnu/system/linux-initrd.scm +++ b/gnu/system/linux-initrd.scm @@ -75,9 +75,10 @@ initrd." (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 @@ initrd." (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 #$compiled) (scm-dir (string-append "share/guile/" (effective-version))) (go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a" @@ -162,39 +161,13 @@ initrd." (for-each (cut utime <> 0 0 0 0) (find-files "." ".*")) - (system* cpio "--version") - (let ((pipe (open-pipe* OPEN_WRITE cpio "-o" - "-O" (string-append #$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 |