250 lines
9.4 KiB
Scheme
250 lines
9.4 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 file-systems)
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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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#:use-module (srfi srfi-26)
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#:export (expression->initrd
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base-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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"Return a derivation that builds a Linux initrd (a gzipped cpio archive)
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containing GUILE and that evaluates EXP, a G-expression, upon booting. All
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the derivations referenced by EXP are automatically copied to the initrd.
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MODULES is 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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(mlet %store-monad ((init (gexp->script "init" exp
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#:modules modules
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#:guile guile)))
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(define builder
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#~(begin
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(use-modules (gnu build linux-initrd))
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(mkdir #$output)
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(build-initrd (string-append #$output "/initrd")
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#:guile #$guile
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#:init #$init
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;; Copy everything INIT refers to into the initrd.
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#:references-graphs '("closure")
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#:cpio (string-append #$cpio "/bin/cpio")
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#:gzip (string-append #$gzip "/bin/gzip"))))
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(gexp->derivation name builder
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#:modules '((guix build utils)
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(guix build store-copy)
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(gnu build linux-initrd))
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#:references-graphs `(("closure" ,init)))))
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(define (flat-linux-module-directory linux modules)
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"Return a flat directory containing the Linux kernel modules listed in
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MODULES and taken from LINUX."
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(define build-exp
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#~(begin
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(use-modules (ice-9 match) (ice-9 regex)
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(srfi srfi-1)
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(guix build utils)
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(gnu build linux-modules))
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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) "$"))
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(define module-dir
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(string-append #$linux "/lib/modules"))
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(define (lookup module)
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(let ((name (ensure-dot-ko module)))
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(match (find-files module-dir (string->regexp name))
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((file)
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file)
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(()
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(error "module not found" name module-dir))
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((_ ...)
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(error "several modules by that name"
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name module-dir)))))
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(define modules
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(let ((modules (map lookup '#$modules)))
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(append modules
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(recursive-module-dependencies modules
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#:lookup-module lookup))))
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(mkdir #$output)
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(for-each (lambda (module)
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(format #t "copying '~a'...~%" module)
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(copy-file module
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(string-append #$output "/"
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(basename module))))
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(delete-duplicates modules))))
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(gexp->derivation "linux-modules" build-exp
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#:modules '((guix build utils)
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(guix elf)
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(gnu build linux-modules))))
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(define (file-system->spec fs)
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"Return a list corresponding to file-system FS that can be passed to the
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initrd code."
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(match fs
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(($ <file-system> device title mount-point type flags options _ check?)
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(list device title mount-point type flags options check?))))
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(define* (base-initrd file-systems
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#:key
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(mapped-devices '())
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qemu-networking?
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virtio?
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volatile-root?
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(extra-modules '()))
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"Return a monadic derivation that builds a generic initrd. FILE-SYSTEMS is
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a list of file-systems to be mounted by the initrd, possibly in addition to
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the root file system specified on the kernel command line via '--root'.
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MAPPED-DEVICES is a list of device mappings to realize before FILE-SYSTEMS are
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mounted.
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When QEMU-NETWORKING? is true, set up networking with the standard QEMU
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parameters. When VIRTIO? is true, load additional modules so the initrd can
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be used as a QEMU guest with para-virtualized I/O drivers.
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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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The initrd is automatically populated with all the kernel modules necessary
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for FILE-SYSTEMS and for the given options. However, additional kernel
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modules can be listed in EXTRA-MODULES. They will be added to the initrd, and
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loaded at boot time in the order in which they appear."
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(define virtio-modules
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;; Modules for Linux para-virtualized devices, for use in QEMU guests.
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'("virtio_pci" "virtio_balloon" "virtio_blk" "virtio_net"))
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(define cifs-modules
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;; Modules needed to mount CIFS file systems.
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'("md4" "ecb" "cifs"))
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(define virtio-9p-modules
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;; Modules for the 9p paravirtualized file system.
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'("9p" "9pnet_virtio"))
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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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`("ahci" ;for SATA controllers
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"pata_acpi" "pata_atiixp" ;for ATA controllers
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,@(if (or virtio? qemu-networking?)
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virtio-modules
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'())
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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")
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'())
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,@extra-modules))
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(define helper-packages
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;; Packages to be copied on the initrd.
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`(,@(if (find (lambda (fs)
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(string-prefix? "ext" (file-system-type fs)))
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file-systems)
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(list e2fsck/static)
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'())
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,@(if volatile-root?
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(list unionfs-fuse/static)
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'())))
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(define device-mapping-commands
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;; List of gexps to open the mapped devices.
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(map (lambda (md)
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(let* ((source (mapped-device-source md))
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(target (mapped-device-target md))
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(type (mapped-device-type md))
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(open (mapped-device-kind-open type)))
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(open source target)))
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mapped-devices))
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(mlet %store-monad ((kodir (flat-linux-module-directory linux-libre
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linux-modules)))
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(expression->initrd
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#~(begin
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(use-modules (gnu build linux-boot)
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(guix build utils)
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(srfi srfi-26))
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(with-output-to-port (%make-void-port "w")
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(lambda ()
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(set-path-environment-variable "PATH" '("bin" "sbin")
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'#$helper-packages)))
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(boot-system #:mounts '#$(map file-system->spec file-systems)
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#:pre-mount (lambda ()
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(and #$@device-mapping-commands))
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#:linux-modules '#$linux-modules
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#:linux-module-directory '#$kodir
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#:qemu-guest-networking? #$qemu-networking?
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#:volatile-root? '#$volatile-root?))
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#:name "base-initrd"
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#:modules '((guix build utils)
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(gnu build linux-boot)
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(gnu build linux-modules)
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(gnu build file-systems)
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(guix elf)))))
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;;; linux-initrd.scm ends here
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