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guix/gnu/system.scm
Ludovic Courtès 856be82323
system: Avoid '_' as a pattern variable in 'match'. 
* gnu/system.scm (operating-system-root-file-system): Don't use '_' as a
wildcard in 'match', to cope with literal semantics in 2.2.
2017-03-10 14:48:06 +01:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015, 2016 Alex Kost <alezost@gmail.com>
;;; Copyright © 2016 Chris Marusich <cmmarusich@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)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix gexp)
#:use-module (guix records)
#:use-module (guix packages)
#:use-module (guix derivations)
#:use-module (guix profiles)
#:use-module (guix ui)
#:use-module (gnu packages base)
#:use-module (gnu packages bash)
#:use-module (gnu packages guile)
#:use-module (gnu packages admin)
#:use-module (gnu packages linux)
#:use-module (gnu packages pciutils)
#:use-module (gnu packages package-management)
#:use-module (gnu packages less)
#:use-module (gnu packages zile)
#:use-module (gnu packages nano)
#:use-module (gnu packages lsof)
#:use-module (gnu packages gawk)
#:use-module (gnu packages man)
#:use-module (gnu packages texinfo)
#:use-module (gnu packages compression)
#:use-module (gnu packages firmware)
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:use-module (gnu services base)
#:use-module (gnu system grub)
#:use-module (gnu system shadow)
#:use-module (gnu system nss)
#:use-module (gnu system locale)
#:use-module (gnu system pam)
#:use-module (gnu system linux-initrd)
#:use-module (gnu system file-systems)
#:use-module (gnu system mapped-devices)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (rnrs bytevectors)
#:export (operating-system
operating-system?
operating-system-bootloader
operating-system-services
operating-system-user-services
operating-system-packages
operating-system-host-name
operating-system-hosts-file
operating-system-kernel
operating-system-kernel-file
operating-system-kernel-arguments
operating-system-initrd
operating-system-users
operating-system-groups
operating-system-issue
operating-system-timezone
operating-system-locale
operating-system-locale-definitions
operating-system-locale-libcs
operating-system-mapped-devices
operating-system-file-systems
operating-system-store-file-system
operating-system-user-mapped-devices
operating-system-boot-mapped-devices
operating-system-activation-script
operating-system-user-accounts
operating-system-shepherd-service-names
operating-system-derivation
operating-system-profile
operating-system-grub.cfg
operating-system-etc-directory
operating-system-locale-directory
operating-system-boot-script
system-linux-image-file-name
boot-parameters
boot-parameters?
boot-parameters-label
boot-parameters-root-device
boot-parameters-store-device
boot-parameters-store-mount-point
boot-parameters-kernel
boot-parameters-kernel-arguments
boot-parameters-initrd
read-boot-parameters
local-host-aliases
%setuid-programs
%base-packages
%base-firmware))
;;; Commentary:
;;;
;;; This module supports whole-system configuration.
;;;
;;; Code:
;; System-wide configuration.
;; TODO: Add per-field docstrings/stexi.
(define-record-type* <operating-system> operating-system
make-operating-system
operating-system?
(kernel operating-system-kernel ; package
(default linux-libre))
(kernel-arguments operating-system-kernel-arguments
(default '())) ; list of gexps/strings
(bootloader operating-system-bootloader) ; <grub-configuration>
(initrd operating-system-initrd ; (list fs) -> M derivation
(default base-initrd))
(firmware operating-system-firmware ; list of packages
(default %base-firmware))
(host-name operating-system-host-name) ; string
(hosts-file operating-system-hosts-file ; file-like | #f
(default #f))
(mapped-devices operating-system-mapped-devices ; list of <mapped-device>
(default '()))
(file-systems operating-system-file-systems) ; list of fs
(swap-devices operating-system-swap-devices ; list of strings
(default '()))
(users operating-system-users ; list of user accounts
(default %base-user-accounts))
(groups operating-system-groups ; list of user groups
(default %base-groups))
(skeletons operating-system-skeletons ; list of name/monadic value
(default (default-skeletons)))
(issue operating-system-issue ; string
(default %default-issue))
(packages operating-system-packages ; list of (PACKAGE OUTPUT...)
(default %base-packages)) ; or just PACKAGE
(timezone operating-system-timezone) ; string
(locale operating-system-locale ; string
(default "en_US.utf8"))
(locale-definitions operating-system-locale-definitions ; list of <locale-definition>
(default %default-locale-definitions))
(locale-libcs operating-system-locale-libcs ; list of <packages>
(default %default-locale-libcs))
(name-service-switch operating-system-name-service-switch ; <name-service-switch>
(default %default-nss))
(services operating-system-user-services ; list of monadic services
(default %base-services))
(pam-services operating-system-pam-services ; list of PAM services
(default (base-pam-services)))
(setuid-programs operating-system-setuid-programs
(default %setuid-programs)) ; list of string-valued gexps
(sudoers-file operating-system-sudoers-file ; file-like
(default %sudoers-specification)))
;;;
;;; Services.
;;;
(define (non-boot-file-system-service os)
"Return the file system service for the file systems of OS that are not
marked as 'needed-for-boot'."
(define file-systems
(remove file-system-needed-for-boot?
(operating-system-file-systems os)))
(define (device-mappings fs)
(let ((device (file-system-device fs)))
(if (string? device) ;title is 'device
(filter (lambda (md)
(string=? (string-append "/dev/mapper/"
(mapped-device-target md))
device))
(operating-system-mapped-devices os))
'())))
(define (add-dependencies fs)
;; Add the dependencies due to device mappings to FS.
(file-system
(inherit fs)
(dependencies
(delete-duplicates (append (device-mappings fs)
(file-system-dependencies fs))
eq?))))
(service file-system-service-type
(map add-dependencies file-systems)))
(define (mapped-device-user device file-systems)
"Return a file system among FILE-SYSTEMS that uses DEVICE, or #f."
(let ((target (string-append "/dev/mapper/" (mapped-device-target device))))
(find (lambda (fs)
(or (member device (file-system-dependencies fs))
(and (eq? 'device (file-system-title fs))
(string=? (file-system-device fs) target))))
file-systems)))
(define (operating-system-user-mapped-devices os)
"Return the subset of mapped devices that can be installed in
user-land--i.e., those not needed during boot."
(let ((devices (operating-system-mapped-devices os))
(file-systems (operating-system-file-systems os)))
(filter (lambda (md)
(let ((user (mapped-device-user md file-systems)))
(or (not user)
(not (file-system-needed-for-boot? user)))))
devices)))
(define (operating-system-boot-mapped-devices os)
"Return the subset of mapped devices that must be installed during boot,
from the initrd."
(let ((devices (operating-system-mapped-devices os))
(file-systems (operating-system-file-systems os)))
(filter (lambda (md)
(let ((user (mapped-device-user md file-systems)))
(and user (file-system-needed-for-boot? user))))
devices)))
(define (device-mapping-services os)
"Return the list of device-mapping services for OS as a list."
(map device-mapping-service
(operating-system-user-mapped-devices os)))
(define (swap-services os)
"Return the list of swap services for OS."
(map swap-service (operating-system-swap-devices os)))
(define* (system-linux-image-file-name #:optional (system (%current-system)))
"Return the basename of the kernel image file for SYSTEM."
;; FIXME: Evaluate the conditional based on the actual current system.
(cond
((string-prefix? "arm" (%current-system)) "zImage")
((string-prefix? "mips" (%current-system)) "vmlinuz")
(else "bzImage")))
(define (operating-system-kernel-file os)
"Return an object representing the absolute file name of the kernel image of
OS."
(file-append (operating-system-kernel os)
"/" (system-linux-image-file-name os)))
(define* (operating-system-directory-base-entries os #:key container?)
"Return the basic entries of the 'system' directory of OS for use as the
value of the SYSTEM-SERVICE-TYPE service."
(mlet %store-monad ((locale (operating-system-locale-directory os)))
(if container?
(return `(("locale" ,locale)))
(mlet %store-monad
((kernel -> (operating-system-kernel os))
(initrd (operating-system-initrd-file os))
(params (operating-system-parameters-file os)))
(return `(("kernel" ,kernel)
("parameters" ,params)
("initrd" ,initrd)
("locale" ,locale))))))) ;used by libc
(define* (essential-services os #:key container?)
"Return the list of essential services for OS. These are special services
that implement part of what's declared in OS are responsible for low-level
bookkeeping. CONTAINER? determines whether to return the list of services for
a container or that of a \"bare metal\" system."
(define known-fs
(map file-system-mount-point (operating-system-file-systems os)))
(let* ((mappings (device-mapping-services os))
(root-fs (root-file-system-service))
(other-fs (non-boot-file-system-service os))
(unmount (user-unmount-service known-fs))
(swaps (swap-services os))
(procs (user-processes-service))
(host-name (host-name-service (operating-system-host-name os)))
(entries (operating-system-directory-base-entries
os #:container? container?)))
(cons* (service system-service-type entries)
%boot-service
;; %SHEPHERD-ROOT-SERVICE must come first so that the gexp that
;; execs shepherd comes last in the boot script (XXX). Likewise,
;; the cleanup service must come last so that its gexp runs before
;; activation code.
%shepherd-root-service
%activation-service
(service cleanup-service-type #f)
(pam-root-service (operating-system-pam-services os))
(account-service (append (operating-system-accounts os)
(operating-system-groups os))
(operating-system-skeletons os))
(operating-system-etc-service os)
(service fstab-service-type '())
(session-environment-service
(operating-system-environment-variables os))
host-name procs root-fs unmount
(service setuid-program-service-type
(operating-system-setuid-programs os))
(service profile-service-type
(operating-system-packages os))
other-fs
(append mappings swaps
;; Add the firmware service, unless we are building for a
;; container.
(if container?
'()
(list %linux-bare-metal-service
(service firmware-service-type
(operating-system-firmware os))))))))
(define* (operating-system-services os #:key container?)
"Return all the services of OS, including \"internal\" services that do not
explicitly appear in OS."
(append (operating-system-user-services os)
(essential-services os #:container? container?)))
;;;
;;; /etc.
;;;
(define %base-firmware
;; Firmware usable by default.
(list ath9k-htc-firmware
openfwwf-firmware))
(define %base-packages
;; Default set of packages globally visible. It should include anything
;; required for basic administrator tasks.
(cons* procps psmisc which less zile nano
lsof ;for Guix's 'list-runtime-roots'
pciutils usbutils
util-linux inetutils isc-dhcp
;; wireless-tools is deprecated in favor of iw, but it's still what
;; many people are familiar with, so keep it around.
iw wireless-tools rfkill
iproute
net-tools ; XXX: remove when Inetutils suffices
man-db
info-reader ;the standalone Info reader (no Perl)
;; The 'sudo' command is already in %SETUID-PROGRAMS, but we also
;; want the other commands and the man pages (notably because
;; auto-completion in Emacs shell relies on man pages.)
sudo
;; Get 'insmod' & co. from kmod, not module-init-tools, since udev
;; already depends on it anyway.
kmod eudev
e2fsprogs kbd
bash-completion
;; The packages below are also in %FINAL-INPUTS, so take them from
;; there to avoid duplication.
(map canonical-package
(list guile-2.0 bash coreutils findutils grep sed
diffutils patch gawk tar gzip bzip2 xz lzip))))
(define %default-issue
;; Default contents for /etc/issue.
"
This is the GNU system. Welcome.\n")
(define (local-host-aliases host-name)
"Return aliases for HOST-NAME, to be used in /etc/hosts."
(string-append "127.0.0.1 localhost " host-name "\n"
"::1 localhost " host-name "\n"))
(define (default-/etc/hosts host-name)
"Return the default /etc/hosts file."
(plain-file "hosts" (local-host-aliases host-name)))
(define* (operating-system-etc-service os)
"Return a <service> that builds containing the static part of the /etc
directory."
(let ((login.defs (plain-file "login.defs" "# Empty for now.\n"))
(issue (plain-file "issue" (operating-system-issue os)))
(nsswitch (plain-file "nsswitch.conf"
(name-service-switch->string
(operating-system-name-service-switch os))))
;; Startup file for POSIX-compliant login shells, which set system-wide
;; environment variables.
(profile (mixed-text-file "profile" "\
# Crucial variables that could be missing in the profiles' 'etc/profile'
# because they would require combining both profiles.
# FIXME: See <http://bugs.gnu.org/20255>.
export MANPATH=$HOME/.guix-profile/share/man:/run/current-system/profile/share/man
export INFOPATH=$HOME/.guix-profile/share/info:/run/current-system/profile/share/info
export XDG_DATA_DIRS=$HOME/.guix-profile/share:/run/current-system/profile/share
export XDG_CONFIG_DIRS=$HOME/.guix-profile/etc/xdg:/run/current-system/profile/etc/xdg
# Ignore the default value of 'PATH'.
unset PATH
# Load the system profile's settings.
GUIX_PROFILE=/run/current-system/profile \\
. /run/current-system/profile/etc/profile
# Prepend setuid programs.
export PATH=/run/setuid-programs:$PATH
# Since 'lshd' does not use pam_env, /etc/environment must be explicitly
# loaded when someone logs in via SSH. See <http://bugs.gnu.org/22175>.
# We need 'PATH' to be defined here, for 'cat' and 'cut'. Do this before
# reading the user's 'etc/profile' to allow variables to be overridden.
if [ -f /etc/environment -a -n \"$SSH_CLIENT\" \\
-a -z \"$LINUX_MODULE_DIRECTORY\" ]
then
. /etc/environment
export `cat /etc/environment | cut -d= -f1`
fi
if [ -f \"$HOME/.guix-profile/etc/profile\" ]
then
# Load the user profile's settings.
GUIX_PROFILE=\"$HOME/.guix-profile\" \\
. \"$HOME/.guix-profile/etc/profile\"
else
# At least define this one so that basic things just work
# when the user installs their first package.
export PATH=\"$HOME/.guix-profile/bin:$PATH\"
fi
# Set the umask, notably for users logging in via 'lsh'.
# See <http://bugs.gnu.org/22650>.
umask 022
# Allow GStreamer-based applications to find plugins.
export GST_PLUGIN_PATH=\"$HOME/.guix-profile/lib/gstreamer-1.0\"
if [ -n \"$BASH_VERSION\" -a -f /etc/bashrc ]
then
# Load Bash-specific initialization code.
. /etc/bashrc
fi
"))
(bashrc (plain-file "bashrc" "\
# Bash-specific initialization.
# The 'bash-completion' package.
if [ -f /run/current-system/profile/etc/profile.d/bash_completion.sh ]
then
# Bash-completion sources ~/.bash_completion. It installs a dynamic
# completion loader that searches its own completion files as well
# as those in ~/.guix-profile and /run/current-system/profile.
source /run/current-system/profile/etc/profile.d/bash_completion.sh
fi\n")))
(etc-service
`(("services" ,(file-append net-base "/etc/services"))
("protocols" ,(file-append net-base "/etc/protocols"))
("rpc" ,(file-append net-base "/etc/rpc"))
("login.defs" ,#~#$login.defs)
("issue" ,#~#$issue)
("nsswitch.conf" ,#~#$nsswitch)
("profile" ,#~#$profile)
("bashrc" ,#~#$bashrc)
("hosts" ,#~#$(or (operating-system-hosts-file os)
(default-/etc/hosts (operating-system-host-name os))))
("localtime" ,(file-append tzdata "/share/zoneinfo/"
(operating-system-timezone os)))
("sudoers" ,(operating-system-sudoers-file os))))))
(define %root-account
;; Default root account.
(user-account
(name "root")
(password "")
(uid 0) (group "root")
(comment "System administrator")
(home-directory "/root")))
(define (operating-system-accounts os)
"Return the user accounts for OS, including an obligatory 'root' account,
and excluding accounts requested by services."
;; Make sure there's a root account.
(if (find (lambda (user)
(and=> (user-account-uid user) zero?))
(operating-system-users os))
(operating-system-users os)
(cons %root-account (operating-system-users os))))
(define (maybe-string->file file-name thing)
"If THING is a string, return a <plain-file> with THING as its content.
Otherwise just return THING.
This is for backward-compatibility of fields that used to be strings and are
now file-like objects.."
(match thing
((? string?)
(warning (_ "using a string for file '~a' is deprecated; \
use 'plain-file' instead~%")
file-name)
(plain-file file-name thing))
(x
x)))
(define (maybe-file->monadic file-name thing)
"If THING is a value in %STORE-MONAD, return it as is; otherwise return
THING in the %STORE-MONAD.
This is for backward-compatibility of fields that used to be monadic values
and are now file-like objects."
(with-monad %store-monad
(match thing
((? procedure?)
(warning (_ "using a monadic value for '~a' is deprecated; \
use 'plain-file' instead~%")
file-name)
thing)
(x
(return x)))))
(define (operating-system-etc-directory os)
"Return that static part of the /etc directory of OS."
(etc-directory
(fold-services (operating-system-services os)
#:target-type etc-service-type)))
(define (operating-system-environment-variables os)
"Return the environment variables of OS for
@var{session-environment-service-type}, to be used in @file{/etc/environment}."
`(("LANG" . ,(operating-system-locale os))
("TZ" . ,(operating-system-timezone os))
("TZDIR" . ,(file-append tzdata "/share/zoneinfo"))
;; Tell 'modprobe' & co. where to look for modules.
("LINUX_MODULE_DIRECTORY" . "/run/booted-system/kernel/lib/modules")
;; These variables are honored by OpenSSL (libssl) and Git.
("SSL_CERT_DIR" . "/etc/ssl/certs")
("SSL_CERT_FILE" . "/etc/ssl/certs/ca-certificates.crt")
("GIT_SSL_CAINFO" . "/etc/ssl/certs/ca-certificates.crt")
;; 'GTK_DATA_PREFIX' must name one directory where GTK+ themes are
;; searched for.
("GTK_DATA_PREFIX" . "/run/current-system/profile")
;; By default, applications that use D-Bus, such as Emacs, abort at startup
;; when /etc/machine-id is missing. Make sure these warnings are non-fatal.
("DBUS_FATAL_WARNINGS" . "0")
;; XXX: Normally we wouldn't need to do this, but our glibc@2.23 package
;; used to look things up in 'PREFIX/lib/locale' instead of
;; '/run/current-system/locale' as was intended. Keep this hack around so
;; that people who still have glibc@2.23-using packages in their profiles
;; can use them correctly.
;; TODO: Remove when glibc@2.23 is long gone.
("GUIX_LOCPATH" . "/run/current-system/locale")))
(define %setuid-programs
;; Default set of setuid-root programs.
(let ((shadow (@ (gnu packages admin) shadow)))
(list (file-append shadow "/bin/passwd")
(file-append shadow "/bin/su")
(file-append inetutils "/bin/ping")
(file-append inetutils "/bin/ping6")
(file-append sudo "/bin/sudo")
(file-append fuse "/bin/fusermount"))))
(define %sudoers-specification
;; Default /etc/sudoers contents: 'root' and all members of the 'wheel'
;; group can do anything. See
;; <http://www.sudo.ws/sudo/man/1.8.10/sudoers.man.html>.
;; TODO: Add a declarative API.
(plain-file "sudoers" "\
root ALL=(ALL) ALL
%wheel ALL=(ALL) ALL\n"))
(define* (operating-system-activation-script os #:key container?)
"Return the activation script for OS---i.e., the code that \"activates\" the
stateful part of OS, including user accounts and groups, special directories,
etc."
(let* ((services (operating-system-services os #:container? container?))
(activation (fold-services services
#:target-type activation-service-type)))
(activation-service->script activation)))
(define* (operating-system-boot-script os #:key container?)
"Return the boot script for OS---i.e., the code started by the initrd once
we're running in the final root. When CONTAINER? is true, skip all
hardware-related operations as necessary when booting a Linux container."
(let* ((services (operating-system-services os #:container? container?))
(boot (fold-services services #:target-type boot-service-type)))
;; BOOT is the script as a monadic value.
(service-parameters boot)))
(define (operating-system-user-accounts os)
"Return the list of user accounts of OS."
(let* ((services (operating-system-services os))
(account (fold-services services
#:target-type account-service-type)))
(filter user-account?
(service-parameters account))))
(define (operating-system-shepherd-service-names os)
"Return the list of Shepherd service names for OS."
(append-map shepherd-service-provision
(service-parameters
(fold-services (operating-system-services os)
#:target-type
shepherd-root-service-type))))
(define* (operating-system-derivation os #:key container?)
"Return a derivation that builds OS."
(let* ((services (operating-system-services os #:container? container?))
(system (fold-services services)))
;; SYSTEM contains the derivation as a monadic value.
(service-parameters system)))
(define* (operating-system-profile os #:key container?)
"Return a derivation that builds the system profile of OS."
(mlet* %store-monad
((services -> (operating-system-services os #:container? container?))
(profile (fold-services services
#:target-type profile-service-type)))
(match profile
(("profile" profile)
(return profile)))))
(define (operating-system-root-file-system os)
"Return the root file system of OS."
(find (match-lambda
(($ <file-system> device title "/") #t)
(x #f))
(operating-system-file-systems os)))
(define (operating-system-initrd-file os)
"Return a gexp denoting the initrd file of OS."
(define boot-file-systems
(filter file-system-needed-for-boot?
(operating-system-file-systems os)))
(define mapped-devices
(operating-system-boot-mapped-devices os))
(define make-initrd
(operating-system-initrd os))
(mlet %store-monad ((initrd (make-initrd boot-file-systems
#:linux (operating-system-kernel os)
#:mapped-devices mapped-devices)))
(return (file-append initrd "/initrd"))))
(define (locale-name->definition* name)
"Variant of 'locale-name->definition' that raises an error upon failure."
(match (locale-name->definition name)
(#f
(raise (condition
(&message
(message (format #f (_ "~a: invalid locale name") name))))))
(def def)))
(define (operating-system-locale-directory os)
"Return the directory containing the locales compiled for the definitions
listed in OS. The C library expects to find it under
/run/current-system/locale."
(define name
(operating-system-locale os))
(define definitions
;; While we're at it, check whether NAME is defined and add it if needed.
(if (member name (map locale-definition-name
(operating-system-locale-definitions os)))
(operating-system-locale-definitions os)
(cons (locale-name->definition* name)
(operating-system-locale-definitions os))))
(locale-directory definitions
#:libcs (operating-system-locale-libcs os)))
(define (kernel->grub-label kernel)
"Return a label for the GRUB menu entry that boots KERNEL."
(string-append "GNU with "
(string-titlecase (package-name kernel)) " "
(package-version kernel)
" (beta)"))
(define (store-file-system file-systems)
"Return the file system object among FILE-SYSTEMS that contains the store."
(match (filter (lambda (fs)
(and (file-system-mount? fs)
(not (memq 'bind-mount (file-system-flags fs)))
(string-prefix? (file-system-mount-point fs)
(%store-prefix))))
file-systems)
((and candidates (head . tail))
(reduce (lambda (fs1 fs2)
(if (> (string-length (file-system-mount-point fs1))
(string-length (file-system-mount-point fs2)))
fs1
fs2))
head
candidates))))
(define (operating-system-store-file-system os)
"Return the file system that contains the store of OS."
(store-file-system (operating-system-file-systems os)))
(define* (operating-system-grub.cfg os #:optional (old-entries '()))
"Return the GRUB configuration file for OS. Use OLD-ENTRIES to populate the
\"old entries\" menu."
(mlet* %store-monad
((system (operating-system-derivation os))
(root-fs -> (operating-system-root-file-system os))
(store-fs -> (operating-system-store-file-system os))
(label -> (kernel->grub-label (operating-system-kernel os)))
(kernel -> (operating-system-kernel-file os))
(initrd (operating-system-initrd-file os))
(root-device -> (if (eq? 'uuid (file-system-title root-fs))
(uuid->string (file-system-device root-fs))
(file-system-device root-fs)))
(entries -> (list (menu-entry
(label label)
;; The device where the kernel and initrd live.
(device (grub-device store-fs))
(device-mount-point
(file-system-mount-point store-fs))
(linux kernel)
(linux-arguments
(cons* (string-append "--root=" root-device)
#~(string-append "--system=" #$system)
#~(string-append "--load=" #$system
"/boot")
(operating-system-kernel-arguments os)))
(initrd initrd)))))
(grub-configuration-file (operating-system-bootloader os) entries
#:old-entries old-entries)))
(define (grub-device fs)
"Given FS, a <file-system> object, return a value suitable for use as the
device in a <menu-entry>."
(case (file-system-title fs)
((uuid) (file-system-device fs))
((label) (file-system-device fs))
(else #f)))
(define (operating-system-parameters-file os)
"Return a file that describes the boot parameters of OS. The primary use of
this file is the reconstruction of GRUB menu entries for old configurations."
(mlet %store-monad ((initrd (operating-system-initrd-file os))
(root -> (operating-system-root-file-system os))
(store -> (operating-system-store-file-system os))
(label -> (kernel->grub-label
(operating-system-kernel os))))
(gexp->file "parameters"
#~(boot-parameters
(version 0)
(label #$label)
(root-device #$(file-system-device root))
(kernel #$(operating-system-kernel-file os))
(kernel-arguments
#$(operating-system-kernel-arguments os))
(initrd #$initrd)
(store
(device #$(grub-device store))
(mount-point #$(file-system-mount-point store))))
#:set-load-path? #f)))
;;;
;;; Boot parameters
;;;
(define-record-type* <boot-parameters>
boot-parameters make-boot-parameters boot-parameters?
(label boot-parameters-label)
;; Because we will use the 'store-device' to create the GRUB search command,
;; the 'store-device' has slightly different semantics than 'root-device'.
;; The 'store-device' can be a file system uuid, a file system label, or #f,
;; but it cannot be a device path such as "/dev/sda3", since GRUB would not
;; understand that. The 'root-device', on the other hand, corresponds
;; exactly to the device field of the <file-system> object representing the
;; OS's root file system, so it might be a device path like "/dev/sda3".
(root-device boot-parameters-root-device)
(store-device boot-parameters-store-device)
(store-mount-point boot-parameters-store-mount-point)
(kernel boot-parameters-kernel)
(kernel-arguments boot-parameters-kernel-arguments)
(initrd boot-parameters-initrd))
(define (read-boot-parameters port)
"Read boot parameters from PORT and return the corresponding
<boot-parameters> object or #f if the format is unrecognized."
(match (read port)
(('boot-parameters ('version 0)
('label label) ('root-device root)
('kernel linux)
rest ...)
(boot-parameters
(label label)
(root-device root)
;; In the past, we would store the directory name of the kernel instead
;; of the absolute file name of its image. Detect that and correct it.
(kernel (if (string=? linux (direct-store-path linux))
(string-append linux "/"
(system-linux-image-file-name))
linux))
(kernel-arguments
(match (assq 'kernel-arguments rest)
((_ args) args)
(#f '()))) ;the old format
(initrd
(match (assq 'initrd rest)
(('initrd ('string-append directory file)) ;the old format
(string-append directory file))
(('initrd (? string? file))
file)))
(store-device
(match (assq 'store rest)
(('store ('device device) _ ...)
device)
(_ ;the old format
;; Root might be a device path like "/dev/sda1", which is not a
;; suitable GRUB device identifier.
(if (string-prefix? "/" root)
#f
root))))
(store-mount-point
(match (assq 'store rest)
(('store ('device _) ('mount-point mount-point) _ ...)
mount-point)
(_ ;the old format
"/")))))
(x ;unsupported format
(warning (_ "unrecognized boot parameters for '~a'~%")
system)
#f)))
;;; system.scm ends here
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