256 lines
9.8 KiB
Scheme
256 lines
9.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2013, 2014, 2015 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 store)
|
||
#: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)
|
||
#:use-module (srfi srfi-26)
|
||
#:export (expression->initrd
|
||
base-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 '()))
|
||
"Return a derivation that builds a Linux initrd (a gzipped cpio archive)
|
||
containing GUILE and that evaluates EXP, a G-expression, upon booting. All
|
||
the derivations referenced by EXP are automatically copied 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'.
|
||
|
||
(mlet %store-monad ((init (gexp->script "init" exp
|
||
#:modules modules
|
||
#:guile guile)))
|
||
(define builder
|
||
#~(begin
|
||
(use-modules (gnu build linux-initrd))
|
||
|
||
(mkdir #$output)
|
||
(build-initrd (string-append #$output "/initrd")
|
||
#:guile #$guile
|
||
#:init #$init
|
||
;; Copy everything INIT refers to into the initrd.
|
||
#:references-graphs '("closure")
|
||
#:cpio (string-append #$cpio "/bin/cpio")
|
||
#:gzip (string-append #$gzip "/bin/gzip"))))
|
||
|
||
(gexp->derivation name builder
|
||
#:modules '((guix build utils)
|
||
(guix build store-copy)
|
||
(gnu build linux-initrd))
|
||
#:references-graphs `(("closure" ,init)))))
|
||
|
||
(define (flat-linux-module-directory linux modules)
|
||
"Return a flat directory containing the Linux kernel modules listed in
|
||
MODULES and taken from LINUX."
|
||
(define build-exp
|
||
#~(begin
|
||
(use-modules (ice-9 match) (ice-9 regex)
|
||
(srfi srfi-1)
|
||
(guix build utils)
|
||
(gnu build linux-modules))
|
||
|
||
(define (string->regexp str)
|
||
;; Return a regexp that matches STR exactly.
|
||
(string-append "^" (regexp-quote str) "$"))
|
||
|
||
(define module-dir
|
||
(string-append #$linux "/lib/modules"))
|
||
|
||
(define (lookup module)
|
||
(let ((name (ensure-dot-ko module)))
|
||
(match (find-files module-dir (string->regexp name))
|
||
((file)
|
||
file)
|
||
(()
|
||
(error "module not found" name module-dir))
|
||
((_ ...)
|
||
(error "several modules by that name"
|
||
name module-dir)))))
|
||
|
||
(define modules
|
||
(let ((modules (map lookup '#$modules)))
|
||
(append modules
|
||
(recursive-module-dependencies modules
|
||
#:lookup-module lookup))))
|
||
|
||
(mkdir #$output)
|
||
(for-each (lambda (module)
|
||
(format #t "copying '~a'...~%" module)
|
||
(copy-file module
|
||
(string-append #$output "/"
|
||
(basename module))))
|
||
(delete-duplicates modules))))
|
||
|
||
(gexp->derivation "linux-modules" build-exp
|
||
#:modules '((guix build utils)
|
||
(guix elf)
|
||
(gnu build linux-modules))))
|
||
|
||
(define (file-system->spec fs)
|
||
"Return a list corresponding to file-system FS that can be passed to the
|
||
initrd code."
|
||
(match fs
|
||
(($ <file-system> device title mount-point type flags options _ check?)
|
||
(list device title mount-point type flags options check?))))
|
||
|
||
(define* (base-initrd file-systems
|
||
#:key
|
||
(linux linux-libre)
|
||
(mapped-devices '())
|
||
qemu-networking?
|
||
virtio?
|
||
volatile-root?
|
||
(extra-modules '()))
|
||
"Return a monadic derivation that builds a generic initrd, with kernel
|
||
modules taken from LINUX. 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'. MAPPED-DEVICES is a list of device
|
||
mappings to realize before FILE-SYSTEMS are mounted.
|
||
|
||
When QEMU-NETWORKING? is true, set up networking with the standard QEMU
|
||
parameters. When VIRTIO? is true, load additional modules so the initrd can
|
||
be used as a QEMU guest with para-virtualized I/O drivers.
|
||
|
||
When VOLATILE-ROOT? is true, the root file system is writable but any changes
|
||
to it are lost.
|
||
|
||
The initrd is automatically populated with all the kernel modules necessary
|
||
for FILE-SYSTEMS and for the given options. However, additional kernel
|
||
modules can be listed in EXTRA-MODULES. They will be added to the initrd, and
|
||
loaded at boot time in the order in which they appear."
|
||
(define virtio-modules
|
||
;; Modules for Linux para-virtualized devices, for use in QEMU guests.
|
||
'("virtio_pci" "virtio_balloon" "virtio_blk" "virtio_net"
|
||
"virtio_console"))
|
||
|
||
(define cifs-modules
|
||
;; Modules needed to mount CIFS file systems.
|
||
'("md4" "ecb" "cifs"))
|
||
|
||
(define virtio-9p-modules
|
||
;; Modules for the 9p paravirtualized file system.
|
||
'("9p" "9pnet_virtio"))
|
||
|
||
(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.
|
||
`("ahci" ;for SATA controllers
|
||
"pata_acpi" "pata_atiixp" ;for ATA controllers
|
||
"isci" ;for SAS controllers like Intel C602
|
||
"usb-storage" "uas" ;for the installation image etc.
|
||
"usbkbd" "usbhid" ;USB keyboards, for debugging
|
||
,@(if (or virtio? qemu-networking?)
|
||
virtio-modules
|
||
'())
|
||
,@(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")
|
||
'())
|
||
,@extra-modules))
|
||
|
||
(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)
|
||
'())))
|
||
|
||
(define device-mapping-commands
|
||
;; List of gexps to open the mapped devices.
|
||
(map (lambda (md)
|
||
(let* ((source (mapped-device-source md))
|
||
(target (mapped-device-target md))
|
||
(type (mapped-device-type md))
|
||
(open (mapped-device-kind-open type)))
|
||
(open source target)))
|
||
mapped-devices))
|
||
|
||
(mlet %store-monad ((kodir (flat-linux-module-directory linux
|
||
linux-modules)))
|
||
(expression->initrd
|
||
#~(begin
|
||
(use-modules (gnu build linux-boot)
|
||
(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)
|
||
#:pre-mount (lambda ()
|
||
(and #$@device-mapping-commands))
|
||
#:linux-modules '#$linux-modules
|
||
#:linux-module-directory '#$kodir
|
||
#:qemu-guest-networking? #$qemu-networking?
|
||
#:volatile-root? '#$volatile-root?))
|
||
#:name "base-initrd"
|
||
#:modules '((guix build utils)
|
||
(gnu build linux-boot)
|
||
(gnu build linux-modules)
|
||
(gnu build file-systems)
|
||
(guix elf)))))
|
||
|
||
;;; linux-initrd.scm ends here
|