Mirror of GNU Guix
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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 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 (guix scripts system)
#:use-module (guix config)
#:use-module (guix ui)
#:use-module (guix store)
#:use-module (guix gexp)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix utils)
#:use-module (guix monads)
#:use-module (guix profiles)
#:use-module (guix scripts build)
#:use-module (guix build utils)
#:use-module (gnu build install)
#:use-module (gnu system)
#:use-module (gnu system vm)
#:use-module (gnu system grub)
#:use-module (gnu packages grub)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (ice-9 match)
#:export (guix-system
read-operating-system))
;;;
;;; Operating system declaration.
;;;
(define %user-module
;; Module in which the machine description file is loaded.
(make-user-module '((gnu system)
(gnu services)
(gnu system shadow))))
(define (read-operating-system file)
"Read the operating-system declaration from FILE and return it."
(load* file %user-module))
;;;
;;; Installation.
;;;
;; TODO: Factorize.
(define references*
(store-lift references))
(define topologically-sorted*
(store-lift topologically-sorted))
(define* (copy-item item target
#:key (log-port (current-error-port)))
"Copy ITEM to the store under root directory TARGET and register it."
(mlet* %store-monad ((refs (references* item)))
(let ((dest (string-append target item))
(state (string-append target "/var/guix")))
(format log-port "copying '~a'...~%" item)
(copy-recursively item dest
#:log (%make-void-port "w"))
;; Register ITEM; as a side-effect, it resets timestamps, etc.
;; Explicitly use "TARGET/var/guix" as the state directory, to avoid
;; reproducing the user's current settings; see
;; <http://bugs.gnu.org/18049>.
(unless (register-path item
#:prefix target
#:state-directory state
#:references refs)
(leave (_ "failed to register '~a' under '~a'~%")
item target))
(return #t))))
(define* (copy-closure item target
#:key (log-port (current-error-port)))
"Copy ITEM and all its dependencies to the store under root directory
TARGET, and register them."
(mlet* %store-monad ((refs (references* item))
(to-copy (topologically-sorted*
(delete-duplicates (cons item refs)
string=?))))
(sequence %store-monad
(map (cut copy-item <> target #:log-port log-port)
to-copy))))
(define (install-grub* grub.cfg device target)
"This is a variant of 'install-grub' with error handling, lifted in
%STORE-MONAD"
(let* ((gc-root (string-append %gc-roots-directory "/grub.cfg"))
(temp-gc-root (string-append gc-root ".new"))
(delete-file (lift1 delete-file %store-monad))
(make-symlink (lift2 switch-symlinks %store-monad))
(rename (lift2 rename-file %store-monad)))
(mbegin %store-monad
;; Prepare the symlink to GRUB.CFG to make sure that it's a GC root when
;; 'install-grub' completes (being a bit paranoid.)
(make-symlink temp-gc-root grub.cfg)
(munless (false-if-exception (install-grub grub.cfg device target))
(delete-file temp-gc-root)
(leave (_ "failed to install GRUB on device '~a'~%") device))
;; Register GRUB.CFG as a GC root so that its dependencies (background
;; image, font, etc.) are not reclaimed.
(rename temp-gc-root gc-root))))
(define* (install os-drv target
#:key (log-port (current-output-port))
grub? grub.cfg device)
"Copy the output of OS-DRV and its dependencies to directory TARGET. TARGET
must be an absolute directory name since that's what 'guix-register' expects.
When GRUB? is true, install GRUB on DEVICE, using GRUB.CFG."
(define (maybe-copy to-copy)
(with-monad %store-monad
(if (string=? target "/")
(begin
(warning (_ "initializing the current root file system~%"))
(return #t))
(begin
;; Make sure the target store exists.
(mkdir-p (string-append target (%store-prefix)))
;; Copy items to the new store.
(copy-closure to-copy target #:log-port log-port)))))
;; Make sure TARGET is root-owned when running as root, but still allow
;; non-root uses (useful for testing.) See
;; <http://lists.gnu.org/archive/html/guix-devel/2015-05/msg00452.html>.
(if (zero? (geteuid))
(chown target 0 0)
(warning (_ "not running as 'root', so \
the ownership of '~a' may be incorrect!~%")
target))
(chmod target #o755)
(let ((os-dir (derivation->output-path os-drv))
(format (lift format %store-monad))
(populate (lift2 populate-root-file-system %store-monad)))
(mbegin %store-monad
(maybe-copy os-dir)
;; Create a bunch of additional files.
(format log-port "populating '~a'...~%" target)
(populate os-dir target)
(mwhen grub?
(install-grub* grub.cfg device target)))))
;;;
;;; Reconfiguration.
;;;
(define %system-profile
;; The system profile.
(string-append %state-directory "/profiles/system"))
(define-syntax-rule (save-environment-excursion body ...)
"Save the current environment variables, run BODY..., and restore them."
(let ((env (environ)))
(dynamic-wind
(const #t)
(lambda ()
body ...)
(lambda ()
(environ env)))))
(define* (switch-to-system os
#:optional (profile %system-profile))
"Make a new generation of PROFILE pointing to the directory of OS, switch to
it atomically, and then run OS's activation script."
(mlet* %store-monad ((drv (operating-system-derivation os))
(script (operating-system-activation-script os)))
(let* ((system (derivation->output-path drv))
(number (+ 1 (generation-number profile)))
(generation (generation-file-name profile number)))
(symlink system generation)
(switch-symlinks profile generation)
(format #t (_ "activating system...~%"))
;; The activation script may change $PATH, among others, so protect
;; against that.
(return (save-environment-excursion
;; Tell 'activate-current-system' what the new system is.
(setenv "GUIX_NEW_SYSTEM" system)
(primitive-load (derivation->output-path script))))
;; TODO: Run 'deco reload ...'.
)))
(define-syntax-rule (unless-file-not-found exp)
(catch 'system-error
(lambda ()
exp)
(lambda args
(if (= ENOENT (system-error-errno args))
#f
(apply throw args)))))
(define (seconds->string seconds)
"Return a string representing the date for SECONDS."
(let ((time (make-time time-utc 0 seconds)))
(date->string (time-utc->date time)
"~Y-~m-~d ~H:~M")))
(define* (previous-grub-entries #:optional (profile %system-profile))
"Return a list of 'menu-entry' for the generations of PROFILE."
(define (system->grub-entry system number time)
(unless-file-not-found
(call-with-input-file (string-append system "/parameters")
(lambda (port)
(match (read port)
(('boot-parameters ('version 0)
('label label) ('root-device root)
('kernel linux)
_ ...)
(menu-entry
(label (string-append label " (#"
(number->string number) ", "
(seconds->string time) ")"))
(linux linux)
(linux-arguments
(list (string-append "--root=" root)
#~(string-append "--system=" #$system)
#~(string-append "--load=" #$system "/boot")))
(initrd #~(string-append #$system "/initrd"))))
(_ ;unsupported format
(warning (_ "unrecognized boot parameters for '~a'~%")
system)
#f))))))
(let* ((numbers (generation-numbers profile))
(systems (map (cut generation-file-name profile <>)
numbers))
(times (map (lambda (system)
(unless-file-not-found
(stat:mtime (lstat system))))
systems)))
(filter-map system->grub-entry systems numbers times)))
;;;
;;; Action.
;;;
(define* (system-derivation-for-action os action
#:key image-size full-boot? mappings)
"Return as a monadic value the derivation for OS according to ACTION."
(case action
((build init reconfigure)
(operating-system-derivation os))
((vm-image)
(system-qemu-image os #:disk-image-size image-size))
((vm)
(system-qemu-image/shared-store-script os
#:full-boot? full-boot?
#:disk-image-size image-size
#:mappings mappings))
((disk-image)
(system-disk-image os #:disk-image-size image-size))))
(define* (maybe-build drvs
#:key dry-run? use-substitutes?)
"Show what will/would be built, and actually build DRVS, unless DRY-RUN? is
true."
(with-monad %store-monad
(>>= (show-what-to-build* drvs
#:dry-run? dry-run?
#:use-substitutes? use-substitutes?)
(lambda (_)
(if dry-run?
(return #f)
(built-derivations drvs))))))
(define* (perform-action action os
#:key grub? dry-run?
use-substitutes? device target
image-size full-boot?
(mappings '()))
"Perform ACTION for OS. GRUB? specifies whether to install GRUB; DEVICE is
the target devices for GRUB; TARGET is the target root directory; IMAGE-SIZE
is the size of the image to be built, for the 'vm-image' and 'disk-image'
actions. FULL-BOOT? is used for the 'vm' action; it determines whether to
boot directly to the kernel or to the bootloader."
(mlet* %store-monad
((sys (system-derivation-for-action os action
#:image-size image-size
#:full-boot? full-boot?
#:mappings mappings))
(grub (package->derivation grub))
(grub.cfg (operating-system-grub.cfg os
(if (eq? 'init action)
'()
(previous-grub-entries))))
(drvs -> (if (and grub? (memq action '(init reconfigure)))
(list sys grub grub.cfg)
(list sys)))
(% (maybe-build drvs #:dry-run? dry-run?
#:use-substitutes? use-substitutes?)))
(if dry-run?
(return #f)
(begin
(for-each (cut format #t "~a~%" <>)
(map derivation->output-path drvs))
;; Make sure GRUB is accessible.
(when grub?
(let ((prefix (derivation->output-path grub)))
(setenv "PATH"
(string-append prefix "/bin:" prefix "/sbin:"
(getenv "PATH")))))
(case action
((reconfigure)
(mbegin %store-monad
(switch-to-system os)
(mwhen grub?
(install-grub* (derivation->output-path grub.cfg)
device "/"))))
((init)
(newline)
(format #t (_ "initializing operating system under '~a'...~%")
target)
(install sys (canonicalize-path target)
#:grub? grub?
#:grub.cfg (derivation->output-path grub.cfg)
#:device device))
(else
;; All we had to do was to build SYS.
(return (derivation->output-path sys))))))))
;;;
;;; Options.
;;;
(define (show-help)
(display (_ "Usage: guix system [OPTION] ACTION FILE
Build the operating system declared in FILE according to ACTION.\n"))
(newline)
(display (_ "The valid values for ACTION are:\n"))
(display (_ "\
- 'reconfigure', switch to a new operating system configuration\n"))
(display (_ "\
- 'build', build the operating system without installing anything\n"))
(display (_ "\
- 'vm', build a virtual machine image that shares the host's store\n"))
(display (_ "\
- 'vm-image', build a freestanding virtual machine image\n"))
(display (_ "\
- 'disk-image', build a disk image, suitable for a USB stick\n"))
(display (_ "\
- 'init', initialize a root file system to run GNU.\n"))
(show-build-options-help)
(display (_ "
--image-size=SIZE for 'vm-image', produce an image of SIZE"))
(display (_ "
--no-grub for 'init', do not install GRUB"))
(display (_ "
--share=SPEC for 'vm', share host file system according to SPEC"))
(display (_ "
--expose=SPEC for 'vm', expose host file system according to SPEC"))
(display (_ "
--full-boot for 'vm', make a full boot sequence"))
(newline)
(display (_ "
-h, --help display this help and exit"))
(display (_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define (specification->file-system-mapping spec writable?)
"Read the SPEC and return the corresponding <file-system-mapping>."
(let ((index (string-index spec #\=)))
(if index
(file-system-mapping
(source (substring spec 0 index))
(target (substring spec (+ 1 index)))
(writable? writable?))
(file-system-mapping
(source spec)
(target spec)
(writable? writable?)))))
(define %options
;; Specifications of the command-line options.
(cons* (option '(#\h "help") #f #f
(lambda args
(show-help)
(exit 0)))
(option '(#\V "version") #f #f
(lambda args
(show-version-and-exit "guix system")))
(option '("image-size") #t #f
(lambda (opt name arg result)
(alist-cons 'image-size (size->number arg)
result)))
(option '("no-grub") #f #f
(lambda (opt name arg result)
(alist-cons 'install-grub? #f result)))
(option '("full-boot") #f #f
(lambda (opt name arg result)
(alist-cons 'full-boot? #t result)))
(option '("share") #t #f
(lambda (opt name arg result)
(alist-cons 'file-system-mapping
(specification->file-system-mapping arg #t)
result)))
(option '("expose") #t #f
(lambda (opt name arg result)
(alist-cons 'file-system-mapping
(specification->file-system-mapping arg #f)
result)))
(option '(#\n "dry-run") #f #f
(lambda (opt name arg result)
(alist-cons 'dry-run? #t result)))
(option '(#\s "system") #t #f
(lambda (opt name arg result)
(alist-cons 'system arg
(alist-delete 'system result eq?))))
%standard-build-options))
(define %default-options
;; Alist of default option values.
`((system . ,(%current-system))
(substitutes? . #t)
(build-hook? . #t)
(max-silent-time . 3600)
(verbosity . 0)
(image-size . ,(* 900 (expt 2 20)))
(install-grub? . #t)))
;;;
;;; Entry point.
;;;
(define (guix-system . args)
(define (parse-sub-command arg result)
;; Parse sub-command ARG and augment RESULT accordingly.
(if (assoc-ref result 'action)
(alist-cons 'argument arg result)
(let ((action (string->symbol arg)))
(case action
((build vm vm-image disk-image reconfigure init)
(alist-cons 'action action result))
(else (leave (_ "~a: unknown action~%") action))))))
(define (match-pair car)
;; Return a procedure that matches a pair with CAR.
(match-lambda
((head . tail)
(and (eq? car head) tail))
(_ #f)))
(define (option-arguments opts)
;; Extract the plain arguments from OPTS.
(let* ((args (reverse (filter-map (match-pair 'argument) opts)))
(count (length args))
(action (assoc-ref opts 'action)))
(define (fail)
(leave (_ "wrong number of arguments for action '~a'~%")
action))
(case action
((build vm vm-image disk-image reconfigure)
(unless (= count 1)
(fail)))
((init)
(unless (= count 2)
(fail))))
args))
(with-error-handling
(let* ((opts (parse-command-line args %options
(list %default-options)
#:argument-handler
parse-sub-command))
(args (option-arguments opts))
(file (first args))
(action (assoc-ref opts 'action))
(system (assoc-ref opts 'system))
(os (if file
(read-operating-system file)
(leave (_ "no configuration file specified~%"))))
(dry? (assoc-ref opts 'dry-run?))
(grub? (assoc-ref opts 'install-grub?))
(target (match args
((first second) second)
(_ #f)))
(device (and grub?
(grub-configuration-device
(operating-system-bootloader os))))
(store (open-connection)))
(set-build-options-from-command-line store opts)
(run-with-store store
(mbegin %store-monad
(set-guile-for-build (default-guile))
(perform-action action os
#:dry-run? dry?
#:use-substitutes? (assoc-ref opts 'substitutes?)
#:image-size (assoc-ref opts 'image-size)
#:full-boot? (assoc-ref opts 'full-boot?)
#:mappings (filter-map (match-lambda
(('file-system-mapping . m)
m)
(_ #f))
opts)
#:grub? grub?
#:target target #:device device))
#:system system))))
;;; system.scm ends here