285 lines
12 KiB
Scheme
285 lines
12 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 system linux-initrd)
|
||
#:use-module (guix monads)
|
||
#:use-module (guix gexp)
|
||
#:use-module (guix utils)
|
||
#:use-module ((guix store)
|
||
#:select (%store-prefix))
|
||
#:use-module ((guix derivations)
|
||
#:select (derivation->output-path))
|
||
#:use-module (gnu packages cpio)
|
||
#:use-module (gnu packages compression)
|
||
#:use-module (gnu packages linux)
|
||
#:use-module (gnu packages guile)
|
||
#:use-module ((gnu packages make-bootstrap)
|
||
#:select (%guile-static-stripped))
|
||
#:use-module (gnu system file-systems)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (ice-9 regex)
|
||
#:use-module (srfi srfi-1)
|
||
#:export (expression->initrd
|
||
qemu-initrd))
|
||
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Tools to build initial RAM disks (initrd's) for Linux-Libre, and in
|
||
;;; particular initrd's that run Guile.
|
||
;;;
|
||
;;; Code:
|
||
|
||
|
||
(define* (expression->initrd exp
|
||
#:key
|
||
(guile %guile-static-stripped)
|
||
(cpio cpio)
|
||
(gzip gzip)
|
||
(name "guile-initrd")
|
||
(system (%current-system))
|
||
(modules '())
|
||
(to-copy '())
|
||
(linux #f)
|
||
(linux-modules '()))
|
||
"Return a package that contains a Linux initrd (a gzipped cpio archive)
|
||
containing GUILE and that evaluates EXP upon booting. LINUX-MODULES is a list
|
||
of `.ko' file names to be copied from LINUX into the initrd. TO-COPY is a
|
||
list of additional derivations or packages to copy to the initrd. MODULES is
|
||
a list of Guile module names to be embedded in the initrd."
|
||
|
||
;; General Linux overview in `Documentation/early-userspace/README' and
|
||
;; `Documentation/filesystems/ramfs-rootfs-initramfs.txt'.
|
||
|
||
(define (string->regexp str)
|
||
;; Return a regexp that matches STR exactly.
|
||
(string-append "^" (regexp-quote str) "$"))
|
||
|
||
(mlet* %store-monad ((source (imported-modules modules))
|
||
(compiled (compiled-modules modules)))
|
||
(define builder
|
||
;; TODO: Move most of this code to (guix build linux-initrd).
|
||
#~(begin
|
||
(use-modules (guix build utils)
|
||
(ice-9 pretty-print)
|
||
(ice-9 popen)
|
||
(ice-9 match)
|
||
(ice-9 ftw)
|
||
(srfi srfi-26)
|
||
(system base compile)
|
||
(rnrs bytevectors)
|
||
((system foreign) #:select (sizeof)))
|
||
|
||
(let ((cpio (string-append #$cpio "/bin/cpio"))
|
||
(gzip (string-append #$gzip "/bin/gzip"))
|
||
(modules #$source)
|
||
(gos #$compiled)
|
||
(scm-dir (string-append "share/guile/" (effective-version)))
|
||
(go-dir (format #f ".cache/guile/ccache/~a-~a-~a-~a"
|
||
(effective-version)
|
||
(if (eq? (native-endianness) (endianness little))
|
||
"LE"
|
||
"BE")
|
||
(sizeof '*)
|
||
(effective-version))))
|
||
(mkdir #$output)
|
||
(mkdir "contents")
|
||
(with-directory-excursion "contents"
|
||
(copy-recursively #$guile ".")
|
||
(call-with-output-file "init"
|
||
(lambda (p)
|
||
(format p "#!/bin/guile -ds~%!#~%" #$guile)
|
||
(pretty-print '#$exp p)))
|
||
(chmod "init" #o555)
|
||
(chmod "bin/guile" #o555)
|
||
|
||
;; Copy Guile modules.
|
||
(chmod scm-dir #o777)
|
||
(copy-recursively modules scm-dir
|
||
#:follow-symlinks? #t)
|
||
(copy-recursively gos (string-append "lib/guile/"
|
||
(effective-version) "/ccache")
|
||
#:follow-symlinks? #t)
|
||
|
||
;; Compile `init'.
|
||
(mkdir-p go-dir)
|
||
(set! %load-path (cons modules %load-path))
|
||
(set! %load-compiled-path (cons gos %load-compiled-path))
|
||
(compile-file "init"
|
||
#:opts %auto-compilation-options
|
||
#:output-file (string-append go-dir "/init.go"))
|
||
|
||
;; Copy Linux modules.
|
||
(let* ((linux #$linux)
|
||
(module-dir (and linux
|
||
(string-append linux "/lib/modules"))))
|
||
(mkdir "modules")
|
||
#$@(map (lambda (module)
|
||
#~(match (find-files module-dir
|
||
#$(string->regexp module))
|
||
((file)
|
||
(format #t "copying '~a'...~%" file)
|
||
(copy-file file (string-append "modules/"
|
||
#$module)))
|
||
(()
|
||
(error "module not found" #$module module-dir))
|
||
((_ ...)
|
||
(error "several modules by that name"
|
||
#$module module-dir))))
|
||
linux-modules))
|
||
|
||
(let ((store #$(string-append "." (%store-prefix)))
|
||
(to-copy '#$to-copy))
|
||
(unless (null? to-copy)
|
||
(mkdir-p store))
|
||
;; XXX: Should we do export-references-graph?
|
||
(for-each (lambda (input)
|
||
(let ((target
|
||
(string-append store "/"
|
||
(basename input))))
|
||
(copy-recursively input target)))
|
||
to-copy))
|
||
|
||
;; Reset the timestamps of all the files that will make it in the
|
||
;; initrd.
|
||
(for-each (cut utime <> 0 0 0 0)
|
||
(find-files "." ".*"))
|
||
|
||
(system* cpio "--version")
|
||
(let ((pipe (open-pipe* OPEN_WRITE cpio "-o"
|
||
"-O" (string-append #$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 #$output
|
||
(and (zero? (system* gzip "--best" "initrd"))
|
||
(rename-file "initrd.gz" "initrd")))))))))
|
||
|
||
(gexp->derivation name builder
|
||
#:modules '((guix build utils)))))
|
||
|
||
(define (file-system->spec fs)
|
||
"Return a list corresponding to file-system FS that can be passed to the
|
||
initrd code."
|
||
(match fs
|
||
(($ <file-system> device mount-point type flags options _ check?)
|
||
(list device mount-point type flags options check?))))
|
||
|
||
(define* (qemu-initrd file-systems
|
||
#:key
|
||
guile-modules-in-chroot?
|
||
(qemu-networking? #t)
|
||
volatile-root?)
|
||
"Return a monadic derivation that builds an initrd for use in a QEMU guest
|
||
where the store is shared with the host. FILE-SYSTEMS is a list of
|
||
file-systems to be mounted by the initrd, possibly in addition to the root
|
||
file system specified on the kernel command line via '--root'.
|
||
|
||
When QEMU-NETWORKING? is true, set up networking with the standard QEMU
|
||
parameters.
|
||
|
||
When VOLATILE-ROOT? is true, the root file system is writable but any changes
|
||
to it are lost.
|
||
|
||
When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in
|
||
the new root. This is necessary is the file specified as '--load' needs
|
||
access to these modules (which is the case if it wants to even just print an
|
||
exception and backtrace!)."
|
||
(define cifs-modules
|
||
;; Modules needed to mount CIFS file systems.
|
||
'("md4.ko" "ecb.ko" "cifs.ko"))
|
||
|
||
(define virtio-9p-modules
|
||
;; Modules for the 9p paravirtualized file system.
|
||
'("9pnet.ko" "9p.ko" "9pnet_virtio.ko"))
|
||
|
||
(define (file-system-type-predicate type)
|
||
(lambda (fs)
|
||
(string=? (file-system-type fs) type)))
|
||
|
||
(define linux-modules
|
||
;; Modules added to the initrd and loaded from the initrd.
|
||
`("virtio.ko" "virtio_ring.ko" "virtio_pci.ko"
|
||
"virtio_balloon.ko" "virtio_blk.ko" "virtio_net.ko"
|
||
,@(if (find (file-system-type-predicate "cifs") file-systems)
|
||
cifs-modules
|
||
'())
|
||
,@(if (find (file-system-type-predicate "9p") file-systems)
|
||
virtio-9p-modules
|
||
'())
|
||
,@(if volatile-root?
|
||
'("fuse.ko")
|
||
'())))
|
||
|
||
(define helper-packages
|
||
;; Packages to be copied on the initrd.
|
||
`(,@(if (find (lambda (fs)
|
||
(string-prefix? "ext" (file-system-type fs)))
|
||
file-systems)
|
||
(list e2fsck/static)
|
||
'())
|
||
,@(if volatile-root?
|
||
(list unionfs-fuse/static)
|
||
'())))
|
||
|
||
(expression->initrd
|
||
#~(begin
|
||
(use-modules (guix build linux-initrd)
|
||
(guix build utils)
|
||
(srfi srfi-26))
|
||
|
||
(with-output-to-port (%make-void-port "w")
|
||
(lambda ()
|
||
(set-path-environment-variable "PATH" '("bin" "sbin")
|
||
'#$helper-packages)))
|
||
|
||
(boot-system #:mounts '#$(map file-system->spec file-systems)
|
||
#:linux-modules '#$linux-modules
|
||
#:qemu-guest-networking? #$qemu-networking?
|
||
#:guile-modules-in-chroot? '#$guile-modules-in-chroot?
|
||
#:volatile-root? '#$volatile-root?))
|
||
#:name "qemu-initrd"
|
||
#:modules '((guix build utils)
|
||
(guix build linux-initrd))
|
||
#:to-copy helper-packages
|
||
#:linux linux-libre
|
||
#:linux-modules linux-modules))
|
||
|
||
;;; linux-initrd.scm ends here
|