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Diffstat (limited to 'guix/scripts/system/reconfigure.scm')
| -rw-r--r-- | guix/scripts/system/reconfigure.scm | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/guix/scripts/system/reconfigure.scm b/guix/scripts/system/reconfigure.scm new file mode 100644 index 0000000000..8c7d461585 --- /dev/null +++ b/guix/scripts/system/reconfigure.scm @@ -0,0 +1,237 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2016 Alex Kost <alezost@gmail.com> +;;; Copyright © 2016, 2017, 2018 Chris Marusich <cmmarusich@gmail.com> +;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> +;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net> +;;; Copyright © 2019 Christopher Baines <mail@cbaines.net> +;;; Copyright © 2019 Jakob L. Kreuze <zerodaysfordays@sdf.lonestar.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 reconfigure) + #:autoload (gnu packages gnupg) (guile-gcrypt) + #:use-module (gnu bootloader) + #:use-module (gnu services) + #:use-module (gnu services herd) + #:use-module (gnu services shepherd) + #:use-module (gnu system) + #:use-module (guix gexp) + #:use-module (guix modules) + #:use-module (guix monads) + #:use-module (guix store) + #:use-module (ice-9 match) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-11) + #:export (switch-system-program + switch-to-system + + upgrade-services-program + upgrade-shepherd-services + + install-bootloader-program + install-bootloader)) + +;;; Commentary: +;;; +;;; This module implements the "effectful" parts of system +;;; reconfiguration. Although building a system derivation is a pure +;;; operation, a number of impure operations must be carried out for the +;;; system configuration to be realized -- chiefly, creation of generation +;;; symlinks and invocation of activation scripts. +;;; +;;; Code: + + +;;; +;;; Profile creation. +;;; + +(define* (switch-system-program os #:optional profile) + "Return an executable store item that, upon being evaluated, will create a +new generation of PROFILE pointing to the directory of OS, switch to it +atomically, and run OS's activation script." + (program-file + "switch-to-system.scm" + (with-extensions (list guile-gcrypt) + (with-imported-modules (source-module-closure '((guix config) + (guix profiles) + (guix utils))) + #~(begin + (use-modules (guix config) + (guix profiles) + (guix utils)) + + (define profile + (or #$profile (string-append %state-directory "/profiles/system"))) + + (let* ((number (1+ (generation-number profile))) + (generation (generation-file-name profile number))) + (switch-symlinks generation #$os) + (switch-symlinks profile generation) + (setenv "GUIX_NEW_SYSTEM" #$os) + (primitive-load #$(operating-system-activation-script os)))))))) + +(define* (switch-to-system eval os #:optional profile) + "Using EVAL, a monadic procedure taking a single G-Expression as an argument, +create a new generation of PROFILE pointing to the directory of OS, switch to +it atomically, and run OS's activation script." + (eval #~(primitive-load #$(switch-system-program os profile)))) + + +;;; +;;; Services. +;;; + +(define (running-services eval) + "Using EVAL, a monadic procedure taking a single G-Expression as an argument, +return the <live-service> objects that are currently running on MACHINE." + (define exp + (with-imported-modules '((gnu services herd)) + #~(begin + (use-modules (gnu services herd)) + (let ((services (current-services))) + (and services + ;; 'live-service-running' is ignored, as we can't necessarily + ;; serialize arbitrary objects. This should be fine for now, + ;; since 'machine-current-services' is not exposed publicly, + ;; and the resultant <live-service> objects are only used for + ;; resolving service dependencies. + (map (lambda (service) + (list (live-service-provision service) + (live-service-requirement service))) + services)))))) + (mlet %store-monad ((services (eval exp))) + (return (map (match-lambda + ((provision requirement) + (live-service provision requirement #f))) + services)))) + +;; XXX: Currently, this does NOT attempt to restart running services. See +;; <https://issues.guix.info/issue/33508> for details. +(define (upgrade-services-program service-files to-start to-unload to-restart) + "Return an executable store item that, upon being evaluated, will upgrade +the Shepherd (PID 1) by unloading obsolete services and loading new +services. SERVICE-FILES is a list of Shepherd service files to load, and +TO-START, TO-UNLOAD, and TO-RESTART are lists of the Shepherd services' +canonical names (symbols)." + (program-file + "upgrade-shepherd-services.scm" + (with-imported-modules '((gnu services herd)) + #~(begin + (use-modules (gnu services herd) + (srfi srfi-1)) + + ;; Load the service files for any new services. + (load-services/safe '#$service-files) + + ;; Unload obsolete services and start new services. + (for-each unload-service '#$to-unload) + (for-each start-service '#$to-start))))) + +(define* (upgrade-shepherd-services eval os) + "Using EVAL, a monadic procedure taking a single G-Expression as an argument, +upgrade the Shepherd (PID 1) by unloading obsolete services and loading new +services as defined by OS." + (define target-services + (service-value + (fold-services (operating-system-services os) + #:target-type shepherd-root-service-type))) + + (mlet* %store-monad ((live-services (running-services eval))) + (let*-values (((to-unload to-restart) + (shepherd-service-upgrade live-services target-services))) + (let* ((to-unload (map live-service-canonical-name to-unload)) + (to-restart (map shepherd-service-canonical-name to-restart)) + (to-start (lset-difference eqv? + (map shepherd-service-canonical-name + target-services) + (map live-service-canonical-name + live-services))) + (service-files + (map shepherd-service-file + (filter (lambda (service) + (memq (shepherd-service-canonical-name service) + to-start)) + target-services)))) + (eval #~(primitive-load #$(upgrade-services-program service-files + to-start + to-unload + to-restart))))))) + + +;;; +;;; Bootloader configuration. +;;; + +(define (install-bootloader-program installer bootloader-package bootcfg + bootcfg-file device target) + "Return an executable store item that, upon being evaluated, will install +BOOTCFG to BOOTCFG-FILE, a target file name, on DEVICE, a file system device, +at TARGET, a mount point, and subsequently run INSTALLER from +BOOTLOADER-PACKAGE." + (program-file + "install-bootloader.scm" + (with-extensions (list guile-gcrypt) + (with-imported-modules (source-module-closure '((gnu build bootloader) + (gnu build install) + (guix store) + (guix utils))) + #~(begin + (use-modules (gnu build bootloader) + (gnu build install) + (guix build utils) + (guix store) + (guix utils) + (ice-9 binary-ports) + (srfi srfi-34) + (srfi srfi-35)) + (let* ((gc-root (string-append #$target %gc-roots-directory "/bootcfg")) + (temp-gc-root (string-append gc-root ".new"))) + (switch-symlinks temp-gc-root gc-root) + (install-boot-config #$bootcfg #$bootcfg-file #$target) + ;; Preserve the previous activation's garbage collector root + ;; until the bootloader installer has run, so that a failure in + ;; the bootloader's installer script doesn't leave the user with + ;; a broken installation. + (when #$installer + (catch #t + (lambda () + (#$installer #$bootloader-package #$device #$target)) + (lambda args + (delete-file temp-gc-root) + (apply throw args)))) + (rename-file temp-gc-root gc-root))))))) + +(define* (install-bootloader eval configuration bootcfg + #:key + (run-installer? #t) + (target "/")) + "Using EVAL, a monadic procedure taking a single G-Expression as an argument, +configure the bootloader on TARGET such that OS will be booted by default and +additional configurations specified by MENU-ENTRIES can be selected." + (let* ((bootloader (bootloader-configuration-bootloader configuration)) + (installer (and run-installer? + (bootloader-installer bootloader))) + (package (bootloader-package bootloader)) + (device (bootloader-configuration-target configuration)) + (bootcfg-file (bootloader-configuration-file bootloader))) + (eval #~(primitive-load #$(install-bootloader-program installer + package + bootcfg + bootcfg-file + device + target))))) |