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guix/gnu/system.scm
Ludovic Courtès de1c158f32 system: Add support for boot-time mapped devices. 
* gnu/build/linux-boot.scm (boot-system): Add #:pre-mount parameter and
  honor it.
* gnu/system/linux-initrd.scm (base-initrd): Add #:mapped-devices
  parameter.  Add 'device-mapping-commands' variable, and use it to
  build the #:pre-mount argument of 'boot-system'.
* gnu/system.scm (mapped-device-user,
  operating-system-user-mapped-devices,
  operating-system-boot-mapped-devices): New procedures.
  (device-mapping-services): Use 'operating-system-user-mapped-devices'
  instead of 'operating-system-mapped-devices'.
  (operating-system-initrd-file): Call the initrd with #:mapped-devices.
2014-09-22 11:20:41 +02:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014 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)
#: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 (gnu packages base)
#:use-module (gnu packages bash)
#:use-module (gnu packages guile)
#:use-module (gnu packages which)
#:use-module (gnu packages admin)
#:use-module (gnu packages linux)
#:use-module (gnu packages package-management)
#:use-module (gnu packages which)
#: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 compression)
#:autoload (gnu packages cryptsetup) (cryptsetup)
#:use-module (gnu services)
#:use-module (gnu services dmd)
#:use-module (gnu services base)
#:use-module (gnu system grub)
#:use-module (gnu system shadow)
#:use-module (gnu system linux)
#:use-module (gnu system linux-initrd)
#:use-module (gnu system file-systems)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#: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-initrd
operating-system-users
operating-system-groups
operating-system-issue
operating-system-packages
operating-system-timezone
operating-system-locale
operating-system-mapped-devices
operating-system-file-systems
operating-system-activation-script
operating-system-derivation
operating-system-profile
operating-system-grub.cfg
%setuid-programs
%base-packages
luks-device-mapping))
;;; 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))
(bootloader operating-system-bootloader) ; <grub-configuration>
(initrd operating-system-initrd ; (list fs) -> M derivation
(default base-initrd))
(host-name operating-system-host-name) ; string
(hosts-file operating-system-hosts-file ; M item | #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 '()))
(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.UTF-8"))
(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 operating-system-sudoers ; /etc/sudoers contents
(default %sudoers-specification)))
;;;
;;; Derivation.
;;;
(define* (file-union name files)
"Return a derivation that builds a directory containing all of FILES. Each
item in FILES must be a list where the first element is the file name to use
in the new directory, and the second element is a gexp denoting the target
file."
(define builder
#~(begin
(mkdir #$output)
(chdir #$output)
#$@(map (match-lambda
((target source)
#~(symlink #$source #$target)))
files)))
(gexp->derivation name builder))
;;;
;;; Services.
;;;
(define (open-luks-device source target)
"Return a gexp that maps SOURCE to TARGET as a LUKS device, using
'cryptsetup'."
#~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
"open" "--type" "luks"
#$source #$target)))
(define (close-luks-device source target)
"Return a gexp that closes TARGET, a LUKS device."
#~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
"close" #$target)))
(define luks-device-mapping
;; The type of LUKS mapped devices.
(mapped-device-kind
(open open-luks-device)
(close close-luks-device)))
(define (other-file-system-services os)
"Return file system services for the file systems of OS that are not marked
as 'needed-for-boot'."
(define file-systems
(remove (lambda (fs)
(or (file-system-needed-for-boot? fs)
(string=? "/" (file-system-mount-point fs))))
(operating-system-file-systems os)))
(define (device-mappings fs)
(filter (lambda (md)
(string=? (string-append "/dev/mapper/"
(mapped-device-target md))
(file-system-device fs)))
(operating-system-mapped-devices os)))
(define (requirements fs)
(map (lambda (md)
(symbol-append 'device-mapping-
(string->symbol (mapped-device-target md))))
(device-mappings fs)))
(sequence %store-monad
(map (lambda (fs)
(match fs
(($ <file-system> device title target type flags opts
#f check? create?)
(file-system-service device target type
#:title title
#:requirements (requirements fs)
#:check? check?
#:create-mount-point? create?
#:options opts
#:flags flags))))
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)
(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 monadic list."
(sequence %store-monad
(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))
(close (mapped-device-kind-close type)))
(device-mapping-service target
(open source target)
(close source target))))
(operating-system-user-mapped-devices os))))
(define (swap-services os)
"Return the list of swap services for OS as a monadic list."
(sequence %store-monad
(map swap-service (operating-system-swap-devices os))))
(define (essential-services os)
"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."
(mlet* %store-monad ((mappings (device-mapping-services os))
(root-fs (root-file-system-service))
(other-fs (other-file-system-services os))
(swaps (swap-services os))
(procs (user-processes-service
(map (compose first service-provision)
other-fs)))
(host-name (host-name-service
(operating-system-host-name os))))
(return (cons* host-name procs root-fs
(append other-fs mappings swaps)))))
(define (operating-system-services os)
"Return all the services of OS, including \"internal\" services that do not
explicitly appear in OS."
(mlet %store-monad
((user (sequence %store-monad (operating-system-user-services os)))
(essential (essential-services os)))
(return (append essential user))))
;;;
;;; /etc.
;;;
(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
(@ (gnu packages admin) dmd) guix
lsof ;for Guix's 'list-runtime-roots'
util-linux inetutils isc-dhcp wireless-tools
net-tools ; XXX: remove when Inetutils suffices
;; Get 'insmod' & co. from kmod, not module-init-tools, since udev
;; already depends on it anyway.
kmod eudev
e2fsprogs kbd
;; 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 gawk tar gzip bzip2 xz lzip))))
(define %default-issue
;; Default contents for /etc/issue.
"
This is the GNU system. Welcome.\n")
(define (default-/etc/hosts host-name)
"Return the default /etc/hosts file."
(text-file "hosts"
(string-append "127.0.0.1 localhost " host-name "\n"
"::1 localhost " host-name "\n")))
(define* (etc-directory #:key
(locale "C") (timezone "Europe/Paris")
(issue "Hello!\n")
(skeletons '())
(pam-services '())
(profile "/run/current-system/profile")
hosts-file
(sudoers ""))
"Return a derivation that builds the static part of the /etc directory."
(mlet* %store-monad
((pam.d (pam-services->directory pam-services))
(sudoers (text-file "sudoers" sudoers))
(login.defs (text-file "login.defs" "# Empty for now.\n"))
(shells (text-file "shells" ; used by xterm and others
"\
/bin/sh
/run/current-system/profile/bin/sh
/run/current-system/profile/bin/bash\n"))
(issue (text-file "issue" issue))
;; For now, generate a basic config so that /etc/hosts is honored.
(nsswitch (text-file "nsswitch.conf"
"hosts: files dns\n"))
;; TODO: Generate bashrc from packages' search-paths.
(bashrc (text-file* "bashrc" "
export PS1='\\u@\\h \\w\\$ '
export LC_ALL=\"" locale "\"
export TZ=\"" timezone "\"
export TZDIR=\"" tzdata "/share/zoneinfo\"
# Tell 'modprobe' & co. where to look for modules.
export LINUX_MODULE_DIRECTORY=/run/booted-system/kernel/lib/modules
export PATH=$HOME/.guix-profile/bin:/run/current-system/profile/bin
export PATH=/run/setuid-programs:/run/current-system/profile/sbin:$PATH
export CPATH=$HOME/.guix-profile/include:" profile "/include
export LIBRARY_PATH=$HOME/.guix-profile/lib:" profile "/lib
alias ls='ls -p --color'
alias ll='ls -l'
"))
(skel (skeleton-directory skeletons)))
(file-union "etc"
`(("services" ,#~(string-append #$net-base "/etc/services"))
("protocols" ,#~(string-append #$net-base "/etc/protocols"))
("rpc" ,#~(string-append #$net-base "/etc/rpc"))
("pam.d" ,#~#$pam.d)
("login.defs" ,#~#$login.defs)
("issue" ,#~#$issue)
("nsswitch.conf" ,#~#$nsswitch)
("skel" ,#~#$skel)
("shells" ,#~#$shells)
("profile" ,#~#$bashrc)
("hosts" ,#~#$hosts-file)
("localtime" ,#~(string-append #$tzdata "/share/zoneinfo/"
#$timezone))
("sudoers" ,#~#$sudoers)))))
(define (operating-system-profile os)
"Return a derivation that builds the system profile of OS."
(profile-derivation (manifest (map package->manifest-entry
(operating-system-packages 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."
(define users
;; 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))))
(mlet %store-monad ((services (operating-system-services os)))
(return (append users
(append-map service-user-accounts services)))))
(define (operating-system-etc-directory os)
"Return that static part of the /etc directory of OS."
(mlet* %store-monad
((services (operating-system-services os))
(pam-services ->
;; Services known to PAM.
(delete-duplicates
(append (operating-system-pam-services os)
(append-map service-pam-services services))))
(profile-drv (operating-system-profile os))
(skeletons (operating-system-skeletons os))
(/etc/hosts (or (operating-system-hosts-file os)
(default-/etc/hosts (operating-system-host-name os)))))
(etc-directory #:pam-services pam-services
#:skeletons skeletons
#:issue (operating-system-issue os)
#:locale (operating-system-locale os)
#:timezone (operating-system-timezone os)
#:hosts-file /etc/hosts
#:sudoers (operating-system-sudoers os)
#:profile profile-drv)))
(define %setuid-programs
;; Default set of setuid-root programs.
(let ((shadow (@ (gnu packages admin) shadow)))
(list #~(string-append #$shadow "/bin/passwd")
#~(string-append #$shadow "/bin/su")
#~(string-append #$inetutils "/bin/ping")
#~(string-append #$sudo "/bin/sudo")
#~(string-append #$fuse "/bin/fusermount"))))
(define %sudoers-specification
;; Default /etc/sudoers contents: 'root' and all members of the 'wheel'
;; group can do anything. See
;; <http://www.sudo.ws/sudo/man/1.8.10/sudoers.man.html>.
;; TODO: Add a declarative API.
"root ALL=(ALL) ALL
%wheel ALL=(ALL) ALL\n")
(define (user-group->gexp group)
"Turn GROUP, a <user-group> object, into a list-valued gexp suitable for
'active-groups'."
#~(list #$(user-group-name group)
#$(user-group-password group)
#$(user-group-id group)
#$(user-group-system? group)))
(define (user-account->gexp account)
"Turn ACCOUNT, a <user-account> object, into a list-valued gexp suitable for
'activate-users'."
#~`(#$(user-account-name account)
#$(user-account-uid account)
#$(user-account-group account)
#$(user-account-supplementary-groups account)
#$(user-account-comment account)
#$(user-account-home-directory account)
,#$(user-account-shell account) ; this one is a gexp
#$(user-account-password account)
#$(user-account-system? account)))
(define (operating-system-activation-script os)
"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."
(define %modules
'((gnu build activation)
(gnu build linux-boot)
(gnu build file-systems)
(guix build utils)))
(define (service-activations services)
;; Return the activation scripts for SERVICES.
(let ((gexps (filter-map service-activate services)))
(sequence %store-monad (map (cut gexp->file "activate-service.scm" <>)
gexps))))
(mlet* %store-monad ((services (operating-system-services os))
(actions (service-activations services))
(etc (operating-system-etc-directory os))
(modules (imported-modules %modules))
(compiled (compiled-modules %modules))
(accounts (operating-system-accounts os)))
(define setuid-progs
(operating-system-setuid-programs os))
(define user-specs
(map user-account->gexp accounts))
(define groups
(append (operating-system-groups os)
(append-map service-user-groups services)))
(define group-specs
(map user-group->gexp groups))
(gexp->file "activate"
#~(begin
(eval-when (expand load eval)
;; Make sure 'use-modules' below succeeds.
(set! %load-path (cons #$modules %load-path))
(set! %load-compiled-path
(cons #$compiled %load-compiled-path)))
(use-modules (gnu build activation))
;; Make sure /bin/sh is valid and current.
(activate-/bin/sh
(string-append #$(canonical-package bash)
"/bin/sh"))
;; Populate /etc.
(activate-etc #$etc)
;; Add users and user groups.
(setenv "PATH"
(string-append #$(@ (gnu packages admin) shadow)
"/sbin"))
(activate-users+groups (list #$@user-specs)
(list #$@group-specs))
;; Activate setuid programs.
(activate-setuid-programs (list #$@setuid-progs))
;; Run the services' activation snippets.
;; TODO: Use 'load-compiled'.
(for-each primitive-load '#$actions)
;; Set up /run/current-system.
(activate-current-system)))))
(define (operating-system-boot-script os)
"Return the boot script for OS---i.e., the code started by the initrd once
we're running in the final root."
(mlet* %store-monad ((services (operating-system-services os))
(activate (operating-system-activation-script os))
(dmd-conf (dmd-configuration-file services)))
(gexp->file "boot"
#~(begin
;; Activate the system.
;; TODO: Use 'load-compiled'.
(primitive-load #$activate)
;; Keep track of the booted system.
(false-if-exception (delete-file "/run/booted-system"))
(symlink (readlink "/run/current-system")
"/run/booted-system")
;; Close any remaining open file descriptors to be on the
;; safe side. This must be the very last thing we do,
;; because Guile has internal FDs such as 'sleep_pipe'
;; that need to be alive.
(let loop ((fd 3))
(when (< fd 1024)
(false-if-exception (close-fdes fd))
(loop (+ 1 fd))))
;; Start dmd.
(execl (string-append #$dmd "/bin/dmd")
"dmd" "--config" #$dmd-conf)))))
(define (operating-system-root-file-system os)
"Return the root file system of OS."
(find (match-lambda
(($ <file-system> _ _ "/") #t)
(_ #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 (match-lambda
(($ <file-system> device title "/")
#t)
(($ <file-system> device title mount-point type flags
options boot?)
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
#:mapped-devices mapped-devices)))
(return #~(string-append #$initrd "/initrd"))))
(define (kernel->grub-label kernel)
"Return a label for the GRUB menu entry that boots KERNEL."
(string-append "GNU system with "
(string-titlecase (package-name kernel)) " "
(package-version kernel)
" (technology preview)"))
(define* (operating-system-grub.cfg os #:optional (old-entries '()))
"Return the GRUB configuration file for OS. Use OLD-ENTRIES to populate the
\"old entries\" menu."
(mlet* %store-monad
((system (operating-system-derivation os))
(root-fs -> (operating-system-root-file-system os))
(kernel -> (operating-system-kernel os))
(entries -> (list (menu-entry
(label (kernel->grub-label kernel))
(linux kernel)
(linux-arguments
(list (string-append "--root="
(file-system-device root-fs))
#~(string-append "--system=" #$system)
#~(string-append "--load=" #$system
"/boot")))
(initrd #~(string-append #$system "/initrd"))))))
(grub-configuration-file (operating-system-bootloader os) entries
#:old-entries old-entries)))
(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))
(label -> (kernel->grub-label
(operating-system-kernel os))))
(gexp->file "parameters"
#~(boot-parameters (version 0)
(label #$label)
(root-device #$(file-system-device root))
(kernel #$(operating-system-kernel os))
(initrd #$initrd)))))
(define (operating-system-derivation os)
"Return a derivation that builds OS."
(mlet* %store-monad
((profile (operating-system-profile os))
(etc (operating-system-etc-directory os))
(boot (operating-system-boot-script os))
(kernel -> (operating-system-kernel os))
(initrd (operating-system-initrd-file os))
(params (operating-system-parameters-file os)))
(file-union "system"
`(("boot" ,#~#$boot)
("kernel" ,#~#$kernel)
("parameters" ,#~#$params)
("initrd" ,initrd)
("profile" ,#~#$profile)
("etc" ,#~#$etc)))))
;;; system.scm ends here
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