guix/gnu/system/linux-initrd.scm
Ludovic Courtès 6d9a859038
linux-initrd: Avoid monadic style a bit.
* gnu/system/linux-initrd.scm (expression->initrd): Use 'program-file'
for 'init'.
(flat-linux-module-directory): Use 'computed-file' instead of
'gexp->derivation'.
(raw-initrd): Adjust accordingly.
2017-07-04 23:45:12 +02:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; 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 (guix modules)
#:use-module (gnu packages compression)
#:use-module (gnu packages disk)
#: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 (gnu system mapped-devices)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:export (expression->initrd
raw-initrd
file-system-packages
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)
(gzip gzip)
(name "guile-initrd")
(system (%current-system)))
"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."
;; General Linux overview in `Documentation/early-userspace/README' and
;; `Documentation/filesystems/ramfs-rootfs-initramfs.txt'.
(define init
(program-file "init" exp #:guile guile))
(define builder
(with-imported-modules (source-module-closure
'((gnu build linux-initrd)))
#~(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")
#:gzip (string-append #$gzip "/bin/gzip")))))
(gexp->derivation name builder
#:references-graphs `(("closure" ,init))))
(define (flat-linux-module-directory linux modules)
"Return a flat directory containing the Linux kernel modules listed in
MODULES and taken from LINUX."
(define build-exp
(with-imported-modules (source-module-closure
'((guix build utils)
(gnu build linux-modules)))
#~(begin
(use-modules (ice-9 match) (ice-9 regex)
(srfi srfi-1)
(guix build utils)
(gnu build linux-modules))
(define (string->regexp str)
;; Return a regexp that matches STR exactly.
(string-append "^" (regexp-quote str) "$"))
(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)))))
(computed-file "linux-modules" build-exp))
(define* (raw-initrd file-systems
#:key
(linux linux-libre)
(linux-modules '())
(mapped-devices '())
(helper-packages '())
qemu-networking?
volatile-root?)
"Return a monadic derivation that builds a raw 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'. LINUX-MODULES is a list of kernel
modules to be loaded at boot time. MAPPED-DEVICES is a list of device
mappings to realize before FILE-SYSTEMS are mounted.
HELPER-PACKAGES is a list of packages to be copied in the initrd. It may include
e2fsck/static or other packages needed by the initrd to check root partition.
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."
(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))
(define kodir
(flat-linux-module-directory linux linux-modules))
(expression->initrd
(with-imported-modules (source-module-closure
'((gnu build linux-boot)
(guix build utils)
(guix build bournish)
(gnu build file-systems)))
#~(begin
(use-modules (gnu build linux-boot)
(guix build utils)
(guix build bournish) ;add the 'bournish' meta-command
(srfi srfi-26)
;; FIXME: The following modules are for
;; LUKS-DEVICE-MAPPING. We should instead propagate
;; this info via gexps.
((gnu build file-systems)
#:select (find-partition-by-luks-uuid))
(rnrs bytevectors))
(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 "raw-initrd"))
(define* (file-system-packages file-systems #:key (volatile-root? #f))
"Return the list of statically-linked, stripped packages to check
FILE-SYSTEMS."
`(,@(if (find (lambda (fs)
(string-prefix? "ext" (file-system-type fs)))
file-systems)
(list e2fsck/static)
'())
,@(if (find (lambda (fs)
(string-suffix? "fat" (file-system-type fs)))
file-systems)
(list fatfsck/static)
'())
,@(if (find (file-system-type-predicate "btrfs") file-systems)
(list btrfs-progs/static)
'())
,@(if volatile-root?
(list unionfs-fuse/static)
'())))
(define* (base-initrd file-systems
#:key
(linux linux-libre)
(mapped-devices '())
qemu-networking?
volatile-root?
(virtio? #t)
(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.
QEMU-NETWORKING? and VOLATILE-ROOT? behaves as in raw-initrd.
When VIRTIO? is true, load additional modules so the initrd can
be used as a QEMU guest with the root file system on a para-virtualized block
device.
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
"usb-storage" "uas" ;for the installation image etc.
"usbhid" "hid-generic" "hid-apple" ;keyboards during early boot
"dm-crypt" "xts" "serpent_generic" "wp512" ;for encrypted root partitions
"nvme" ;for new SSD NVMe devices
"nls_iso8859-1" ;for `mkfs.fat`, et.al
,@(if (string-match "^(x86_64|i[3-6]86)-" (%current-system))
'("pata_acpi" "pata_atiixp" ;for ATA controllers
"isci") ;for SAS controllers like Intel C602
'())
,@(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 (find (file-system-type-predicate "btrfs") file-systems)
'("btrfs")
'())
,@(if (find (file-system-type-predicate "iso9660") file-systems)
'("isofs")
'())
,@(if volatile-root?
'("fuse")
'())
,@extra-modules))
(define helper-packages
(file-system-packages file-systems #:volatile-root? volatile-root?))
(raw-initrd file-systems
#:linux linux
#:linux-modules linux-modules
#:mapped-devices mapped-devices
#:helper-packages helper-packages
#:qemu-networking? qemu-networking?
#:volatile-root? volatile-root?))
;;; linux-initrd.scm ends here