727 lines
28 KiB
Scheme
727 lines
28 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
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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 (guix scripts system)
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#:use-module (guix config)
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#:use-module (guix ui)
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#:use-module (guix store)
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#:use-module (guix gexp)
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#:use-module (guix derivations)
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#:use-module (guix packages)
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#:use-module (guix utils)
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#:use-module (guix monads)
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#:use-module (guix records)
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#:use-module (guix profiles)
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#:use-module (guix scripts)
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#:use-module (guix scripts build)
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#:use-module (guix graph)
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#:use-module (guix scripts graph)
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#:use-module (guix build utils)
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#:use-module (gnu build install)
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#:use-module (gnu system)
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#:use-module (gnu system file-systems)
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#:use-module (gnu system linux-container)
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#:use-module (gnu system vm)
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#:use-module (gnu system grub)
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#:use-module (gnu services)
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#:use-module (gnu services shepherd)
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#:use-module (gnu packages grub)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:use-module (srfi srfi-37)
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#:use-module (ice-9 match)
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#:export (guix-system
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read-operating-system))
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;;;
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;;; Operating system declaration.
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;;;
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(define %user-module
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;; Module in which the machine description file is loaded.
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(make-user-module '((gnu system)
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(gnu services)
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(gnu system shadow))))
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(define (read-operating-system file)
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"Read the operating-system declaration from FILE and return it."
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(load* file %user-module))
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;;;
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;;; Installation.
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;;;
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;; TODO: Factorize.
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(define references*
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(store-lift references))
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(define topologically-sorted*
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(store-lift topologically-sorted))
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(define* (copy-item item target
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#:key (log-port (current-error-port)))
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"Copy ITEM to the store under root directory TARGET and register it."
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(mlet* %store-monad ((refs (references* item)))
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(let ((dest (string-append target item))
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(state (string-append target "/var/guix")))
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(format log-port "copying '~a'...~%" item)
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;; Remove DEST if it exists to make sure that (1) we do not fail badly
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;; while trying to overwrite it (see <http://bugs.gnu.org/20722>), and
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;; (2) we end up with the right contents.
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(when (file-exists? dest)
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(delete-file-recursively dest))
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(copy-recursively item dest
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#:log (%make-void-port "w"))
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;; Register ITEM; as a side-effect, it resets timestamps, etc.
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;; Explicitly use "TARGET/var/guix" as the state directory, to avoid
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;; reproducing the user's current settings; see
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;; <http://bugs.gnu.org/18049>.
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(unless (register-path item
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#:prefix target
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#:state-directory state
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#:references refs)
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(leave (_ "failed to register '~a' under '~a'~%")
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item target))
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(return #t))))
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(define* (copy-closure item target
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#:key (log-port (current-error-port)))
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"Copy ITEM and all its dependencies to the store under root directory
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TARGET, and register them."
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(mlet* %store-monad ((refs (references* item))
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(to-copy (topologically-sorted*
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(delete-duplicates (cons item refs)
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string=?))))
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(sequence %store-monad
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(map (cut copy-item <> target #:log-port log-port)
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to-copy))))
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(define (install-grub* grub.cfg device target)
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"This is a variant of 'install-grub' with error handling, lifted in
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%STORE-MONAD"
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(let* ((gc-root (string-append %gc-roots-directory "/grub.cfg"))
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(temp-gc-root (string-append gc-root ".new"))
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(delete-file (lift1 delete-file %store-monad))
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(make-symlink (lift2 switch-symlinks %store-monad))
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(rename (lift2 rename-file %store-monad)))
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(mbegin %store-monad
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;; Prepare the symlink to GRUB.CFG to make sure that it's a GC root when
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;; 'install-grub' completes (being a bit paranoid.)
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(make-symlink temp-gc-root grub.cfg)
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(munless (false-if-exception (install-grub grub.cfg device target))
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(delete-file temp-gc-root)
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(leave (_ "failed to install GRUB on device '~a'~%") device))
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;; Register GRUB.CFG as a GC root so that its dependencies (background
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;; image, font, etc.) are not reclaimed.
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(rename temp-gc-root gc-root))))
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(define* (install os-drv target
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#:key (log-port (current-output-port))
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grub? grub.cfg device)
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"Copy the closure of GRUB.CFG, which includes the output of OS-DRV, to
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directory TARGET. TARGET must be an absolute directory name since that's what
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'guix-register' expects.
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When GRUB? is true, install GRUB on DEVICE, using GRUB.CFG."
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(define (maybe-copy to-copy)
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(with-monad %store-monad
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(if (string=? target "/")
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(begin
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(warning (_ "initializing the current root file system~%"))
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(return #t))
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(begin
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;; Make sure the target store exists.
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(mkdir-p (string-append target (%store-prefix)))
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;; Copy items to the new store.
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(copy-closure to-copy target #:log-port log-port)))))
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;; Make sure TARGET is root-owned when running as root, but still allow
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;; non-root uses (useful for testing.) See
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;; <http://lists.gnu.org/archive/html/guix-devel/2015-05/msg00452.html>.
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(if (zero? (geteuid))
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(chown target 0 0)
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(warning (_ "not running as 'root', so \
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the ownership of '~a' may be incorrect!~%")
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target))
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(chmod target #o755)
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(let ((os-dir (derivation->output-path os-drv))
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(format (lift format %store-monad))
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(populate (lift2 populate-root-file-system %store-monad)))
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(mbegin %store-monad
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;; Copy the closure of GRUB.CFG, which includes OS-DIR, GRUB's
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;; background image and so on.
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(maybe-copy grub.cfg)
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;; Create a bunch of additional files.
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(format log-port "populating '~a'...~%" target)
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(populate os-dir target)
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(mwhen grub?
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(install-grub* grub.cfg device target)))))
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;;;
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;;; Reconfiguration.
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;;;
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(define %system-profile
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;; The system profile.
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(string-append %state-directory "/profiles/system"))
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(define-syntax-rule (save-environment-excursion body ...)
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"Save the current environment variables, run BODY..., and restore them."
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(let ((env (environ)))
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(dynamic-wind
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(const #t)
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(lambda ()
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body ...)
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(lambda ()
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(environ env)))))
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(define* (switch-to-system os
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#:optional (profile %system-profile))
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"Make a new generation of PROFILE pointing to the directory of OS, switch to
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it atomically, and then run OS's activation script."
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(mlet* %store-monad ((drv (operating-system-derivation os))
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(script (operating-system-activation-script os)))
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(let* ((system (derivation->output-path drv))
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(number (+ 1 (generation-number profile)))
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(generation (generation-file-name profile number)))
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(symlink system generation)
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(switch-symlinks profile generation)
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(format #t (_ "activating system...~%"))
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;; The activation script may change $PATH, among others, so protect
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;; against that.
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(return (save-environment-excursion
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;; Tell 'activate-current-system' what the new system is.
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(setenv "GUIX_NEW_SYSTEM" system)
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(primitive-load (derivation->output-path script))))
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;; TODO: Run 'deco reload ...'.
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)))
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(define-syntax-rule (unless-file-not-found exp)
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(catch 'system-error
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(lambda ()
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exp)
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(lambda args
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(if (= ENOENT (system-error-errno args))
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#f
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(apply throw args)))))
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(define (seconds->string seconds)
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"Return a string representing the date for SECONDS."
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(let ((time (make-time time-utc 0 seconds)))
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(date->string (time-utc->date time)
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"~Y-~m-~d ~H:~M")))
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(define* (previous-grub-entries #:optional (profile %system-profile))
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"Return a list of 'menu-entry' for the generations of PROFILE."
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(define (system->grub-entry system number time)
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(unless-file-not-found
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(let* ((file (string-append system "/parameters"))
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(params (call-with-input-file file
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read-boot-parameters))
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(label (boot-parameters-label params))
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(root (boot-parameters-root-device params))
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(kernel (boot-parameters-kernel params))
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(kernel-arguments (boot-parameters-kernel-arguments params)))
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(menu-entry
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(label (string-append label " (#"
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(number->string number) ", "
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(seconds->string time) ")"))
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(linux kernel)
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(linux-arguments
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(cons* (string-append "--root=" root)
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#~(string-append "--system=" #$system)
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#~(string-append "--load=" #$system "/boot")
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kernel-arguments))
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(initrd #~(string-append #$system "/initrd"))))))
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(let* ((numbers (generation-numbers profile))
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(systems (map (cut generation-file-name profile <>)
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numbers))
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(times (map (lambda (system)
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(unless-file-not-found
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(stat:mtime (lstat system))))
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systems)))
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(filter-map system->grub-entry systems numbers times)))
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;;;
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;;; Graphs.
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;;;
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(define (service-node-label service)
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"Return a label to represent SERVICE."
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(let ((type (service-kind service))
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(value (service-parameters service)))
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(string-append (symbol->string (service-type-name type))
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(cond ((or (number? value) (symbol? value))
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(string-append " " (object->string value)))
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((string? value)
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(string-append " " value))
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((file-system? value)
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(string-append " " (file-system-mount-point value)))
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(else
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"")))))
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(define (service-node-type services)
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"Return a node type for SERVICES. Since <service> instances are not
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self-contained (they express dependencies on service types, not on services),
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we have to create the 'edges' procedure dynamically as a function of the full
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list of services."
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(node-type
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(name "service")
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(description "the DAG of services")
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(identifier (lift1 object-address %store-monad))
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(label service-node-label)
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(edges (lift1 (service-back-edges services) %store-monad))))
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(define (shepherd-service-node-label service)
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"Return a label for a node representing a <shepherd-service>."
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(string-join (map symbol->string (shepherd-service-provision service))))
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(define (shepherd-service-node-type services)
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"Return a node type for SERVICES, a list of <shepherd-service>."
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(node-type
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(name "shepherd-service")
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(description "the dependency graph of shepherd services")
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(identifier (lift1 shepherd-service-node-label %store-monad))
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(label shepherd-service-node-label)
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(edges (lift1 (shepherd-service-back-edges services) %store-monad))))
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;;;
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;;; Generations.
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;;;
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(define* (display-system-generation number
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#:optional (profile %system-profile))
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"Display a summary of system generation NUMBER in a human-readable format."
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(unless (zero? number)
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(let* ((generation (generation-file-name profile number))
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(param-file (string-append generation "/parameters"))
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(params (call-with-input-file param-file read-boot-parameters))
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(label (boot-parameters-label params))
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(root (boot-parameters-root-device params))
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(kernel (boot-parameters-kernel params)))
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(display-generation profile number)
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(format #t (_ " file name: ~a~%") generation)
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(format #t (_ " canonical file name: ~a~%") (readlink* generation))
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;; TRANSLATORS: Please preserve the two-space indentation.
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(format #t (_ " label: ~a~%") label)
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(format #t (_ " root device: ~a~%") root)
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(format #t (_ " kernel: ~a~%") kernel))))
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(define* (list-generations pattern #:optional (profile %system-profile))
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"Display in a human-readable format all the system generations matching
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PATTERN, a string. When PATTERN is #f, display all the system generations."
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(cond ((not (file-exists? profile)) ; XXX: race condition
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(raise (condition (&profile-not-found-error
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(profile profile)))))
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((string-null? pattern)
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(for-each display-system-generation (profile-generations profile)))
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((matching-generations pattern profile)
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=>
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(lambda (numbers)
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(if (null-list? numbers)
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(exit 1)
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(leave-on-EPIPE
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(for-each display-system-generation numbers)))))
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(else
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(leave (_ "invalid syntax: ~a~%") pattern))))
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;;;
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;;; Action.
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;;;
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(define* (system-derivation-for-action os action
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#:key image-size full-boot? mappings)
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"Return as a monadic value the derivation for OS according to ACTION."
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(case action
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((build init reconfigure)
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(operating-system-derivation os))
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((container)
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(container-script os #:mappings mappings))
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((vm-image)
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(system-qemu-image os #:disk-image-size image-size))
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((vm)
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(system-qemu-image/shared-store-script os
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#:full-boot? full-boot?
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#:disk-image-size image-size
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#:mappings mappings))
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((disk-image)
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(system-disk-image os #:disk-image-size image-size))))
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(define* (perform-action action os
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#:key grub? dry-run? derivations-only?
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use-substitutes? device target
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image-size full-boot?
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(mappings '()))
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"Perform ACTION for OS. GRUB? specifies whether to install GRUB; DEVICE is
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the target devices for GRUB; TARGET is the target root directory; IMAGE-SIZE
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is the size of the image to be built, for the 'vm-image' and 'disk-image'
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actions. FULL-BOOT? is used for the 'vm' action; it determines whether to
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boot directly to the kernel or to the bootloader.
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When DERIVATIONS-ONLY? is true, print the derivation file name(s) without
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building anything."
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(define println
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(cut format #t "~a~%" <>))
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(mlet* %store-monad
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((sys (system-derivation-for-action os action
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#:image-size image-size
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#:full-boot? full-boot?
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#:mappings mappings))
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(grub (package->derivation grub))
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(grub.cfg (if (eq? 'container action)
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(return #f)
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(operating-system-grub.cfg os
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(if (eq? 'init action)
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'()
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(previous-grub-entries)))))
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;; For 'init' and 'reconfigure', always build GRUB.CFG, even if
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;; --no-grub is passed, because GRUB.CFG because we then use it as a GC
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;; root. See <http://bugs.gnu.org/21068>.
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(drvs -> (if (memq action '(init reconfigure))
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(if grub?
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(list sys grub.cfg grub)
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(list sys grub.cfg))
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(list sys)))
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(% (if derivations-only?
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(return (for-each (compose println derivation-file-name)
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drvs))
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(maybe-build drvs #:dry-run? dry-run?
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#:use-substitutes? use-substitutes?))))
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(if (or dry-run? derivations-only?)
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(return #f)
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(begin
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(for-each (compose println derivation->output-path)
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drvs)
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;; Make sure GRUB is accessible.
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(when grub?
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(let ((prefix (derivation->output-path grub)))
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(setenv "PATH"
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(string-append prefix "/bin:" prefix "/sbin:"
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(getenv "PATH")))))
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(case action
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((reconfigure)
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(mbegin %store-monad
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(switch-to-system os)
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(mwhen grub?
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(install-grub* (derivation->output-path grub.cfg)
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device "/"))))
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((init)
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(newline)
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(format #t (_ "initializing operating system under '~a'...~%")
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target)
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(install sys (canonicalize-path target)
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#:grub? grub?
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#:grub.cfg (derivation->output-path grub.cfg)
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#:device device))
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(else
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;; All we had to do was to build SYS.
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(return (derivation->output-path sys))))))))
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(define (export-extension-graph os port)
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"Export the service extension graph of OS to PORT."
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(let* ((services (operating-system-services os))
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(system (find (lambda (service)
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(eq? (service-kind service) system-service-type))
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services)))
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(export-graph (list system) (current-output-port)
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#:node-type (service-node-type services)
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#:reverse-edges? #t)))
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(define (export-shepherd-graph os port)
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"Export the graph of shepherd services of OS to PORT."
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(let* ((services (operating-system-services os))
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(pid1 (fold-services services
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#:target-type shepherd-root-service-type))
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(shepherds (service-parameters pid1)) ;list of <shepherd-service>
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(sinks (filter (lambda (service)
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(null? (shepherd-service-requirement service)))
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shepherds)))
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(export-graph sinks (current-output-port)
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#:node-type (shepherd-service-node-type shepherds)
|
||
#:reverse-edges? #t)))
|
||
|
||
|
||
;;;
|
||
;;; 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"))
|
||
(newline)
|
||
(display (_ "\
|
||
reconfigure switch to a new operating system configuration\n"))
|
||
(display (_ "\
|
||
list-generations list the system generations\n"))
|
||
(display (_ "\
|
||
build build the operating system without installing anything\n"))
|
||
(display (_ "\
|
||
container build a container that shares the host's store\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"))
|
||
(display (_ "\
|
||
extension-graph emit the service extension graph in Dot format\n"))
|
||
(display (_ "\
|
||
shepherd-graph emit the graph of shepherd services in Dot format\n"))
|
||
|
||
(show-build-options-help)
|
||
(display (_ "
|
||
-d, --derivation return the derivation of the given system"))
|
||
(display (_ "
|
||
--on-error=STRATEGY
|
||
apply STRATEGY when an error occurs while reading FILE"))
|
||
(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 %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 '(#\d "derivation") #f #f
|
||
(lambda (opt name arg result)
|
||
(alist-cons 'derivations-only? #t result)))
|
||
(option '("on-error") #t #f
|
||
(lambda (opt name arg result)
|
||
(alist-cons 'on-error (string->symbol arg)
|
||
result)))
|
||
(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 (process-action action args opts)
|
||
"Process ACTION, a sub-command, with the arguments are listed in ARGS.
|
||
ACTION must be one of the sub-commands that takes an operating system
|
||
declaration as an argument (a file name.) OPTS is the raw alist of options
|
||
resulting from command-line parsing."
|
||
(let* ((file (match args
|
||
(() #f)
|
||
((x . _) x)))
|
||
(system (assoc-ref opts 'system))
|
||
(os (if file
|
||
(load* file %user-module
|
||
#:on-error (assoc-ref opts 'on-error))
|
||
(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)))))
|
||
|
||
(with-store store
|
||
(set-build-options-from-command-line store opts)
|
||
|
||
(run-with-store store
|
||
(mbegin %store-monad
|
||
(set-guile-for-build (default-guile))
|
||
(case action
|
||
((extension-graph)
|
||
(export-extension-graph os (current-output-port)))
|
||
((shepherd-graph)
|
||
(export-shepherd-graph os (current-output-port)))
|
||
(else
|
||
(perform-action action os
|
||
#:dry-run? dry?
|
||
#:derivations-only? (assoc-ref opts
|
||
'derivations-only?)
|
||
#: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))))
|
||
|
||
(define (process-command command args opts)
|
||
"Process COMMAND, one of the 'guix system' sub-commands. ARGS is its
|
||
argument list and OPTS is the option alist."
|
||
(case command
|
||
((list-generations)
|
||
;; List generations. No need to connect to the daemon, etc.
|
||
(let ((pattern (match args
|
||
(() "")
|
||
((pattern) pattern)
|
||
(x (leave (_ "wrong number of arguments~%"))))))
|
||
(list-generations pattern)))
|
||
(else
|
||
(process-action command args opts))))
|
||
|
||
(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 container vm vm-image disk-image reconfigure init
|
||
extension-graph shepherd-graph list-generations)
|
||
(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))
|
||
|
||
(unless action
|
||
(format (current-error-port)
|
||
(_ "guix system: missing command name~%"))
|
||
(format (current-error-port)
|
||
(_ "Try 'guix system --help' for more information.~%"))
|
||
(exit 1))
|
||
|
||
(case action
|
||
((build container 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))
|
||
(command (assoc-ref opts 'action)))
|
||
(process-command command args opts))))
|
||
|
||
;;; system.scm ends here
|