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