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authorLudovic Courtès <ludo@gnu.org>2014-09-03 15:13:44 +0200
committerLudovic Courtès <ludo@gnu.org>2014-09-03 15:43:07 +0200
commitfbb3555809966ee2dacfe16451fba0b963d1cdc0 (patch)
tree771d779b73ba4637fed5401fdb02284c9de9f998
parente2f4b305d0b7cff1e19c7f67ea633ef8a971e712 (diff)
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.
-rw-r--r--gnu-system.am1
-rw-r--r--gnu/build/linux-initrd.scm70
-rw-r--r--gnu/system/linux-initrd.scm45
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