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+;;; GNU Guix --- Functional package management for GNU
+;;; 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 (gnu tests reconfigure)
+ #:use-module (gnu bootloader)
+ #:use-module (gnu services shepherd)
+ #:use-module (gnu system vm)
+ #:use-module (gnu system)
+ #:use-module (gnu tests)
+ #:use-module (guix derivations)
+ #:use-module (guix gexp)
+ #:use-module (guix monads)
+ #:use-module (guix scripts system reconfigure)
+ #:use-module (guix store)
+ #:export (%test-switch-to-system
+ %test-upgrade-services
+ %test-install-bootloader))
+
+;;; Commentary:
+;;;
+;;; Test in-place system reconfiguration: advancing the system generation on a
+;;; running instance of the Guix System.
+;;;
+;;; Code:
+
+(define* (run-switch-to-system-test)
+ "Run a test of an OS running SWITCH-SYSTEM-PROGRAM, which creates a new
+generation of the system profile."
+ (define os
+ (marionette-operating-system
+ (simple-operating-system)
+ #:imported-modules '((gnu services herd)
+ (guix combinators))))
+
+ (define vm (virtual-machine os))
+
+ (define (test script)
+ (with-imported-modules '((gnu build marionette))
+ #~(begin
+ (use-modules (gnu build marionette)
+ (srfi srfi-64))
+
+ (define marionette
+ (make-marionette (list #$vm)))
+
+ ;; Return the names of the generation symlinks on MARIONETTE.
+ (define (system-generations marionette)
+ (marionette-eval
+ '(begin
+ (use-modules (ice-9 ftw)
+ (srfi srfi-1))
+ (let* ((profile-dir "/var/guix/profiles/")
+ (entries (map first (cddr (file-system-tree profile-dir)))))
+ (remove (lambda (entry)
+ (member entry '("per-user" "system")))
+ entries)))
+ marionette))
+
+ (mkdir #$output)
+ (chdir #$output)
+
+ (test-begin "switch-to-system")
+
+ (let ((generations-prior (system-generations marionette)))
+ (test-assert "script successfully evaluated"
+ (marionette-eval
+ '(primitive-load #$script)
+ marionette))
+
+ (test-equal "script created new generation"
+ (length (system-generations marionette))
+ (1+ (length generations-prior))))
+
+ (test-end)
+ (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+ (gexp->derivation "switch-to-system" (test (switch-system-program os))))
+
+(define* (run-upgrade-services-test)
+ "Run a test of an OS running UPGRADE-SERVICES-PROGRAM, which upgrades the
+Shepherd (PID 1) by unloading obsolete services and loading new services."
+ (define os
+ (marionette-operating-system
+ (simple-operating-system)
+ #:imported-modules '((gnu services herd)
+ (guix combinators))))
+
+ (define vm (virtual-machine os))
+
+ (define dummy-service
+ ;; Shepherd service that does nothing, for the sole purpose of ensuring
+ ;; that it is properly installed and started by the script.
+ (shepherd-service (provision '(dummy))
+ (start #~(const #t))
+ (stop #~(const #t))
+ (respawn? #f)))
+
+ ;; Return the Shepherd service file for SERVICE, after ensuring that it
+ ;; exists in the store.
+ (define (ensure-service-file service)
+ (let ((file (shepherd-service-file service)))
+ (mlet* %store-monad ((store-object (lower-object file))
+ (_ (built-derivations (list store-object))))
+ (return file))))
+
+ (define (test enable-dummy disable-dummy)
+ (with-imported-modules '((gnu build marionette))
+ #~(begin
+ (use-modules (gnu build marionette)
+ (srfi srfi-64))
+
+ (define marionette
+ (make-marionette (list #$vm)))
+
+ ;; Return the names of the running services on MARIONETTE.
+ (define (running-services marionette)
+ (marionette-eval
+ '(begin
+ (use-modules (gnu services herd))
+ (map live-service-canonical-name (current-services)))
+ marionette))
+
+ (mkdir #$output)
+ (chdir #$output)
+
+ (test-begin "upgrade-services")
+
+ (let ((services-prior (running-services marionette)))
+ (test-assert "script successfully evaluated"
+ (marionette-eval
+ '(primitive-load #$enable-dummy)
+ marionette))
+
+ (test-assert "script started new service"
+ (and (not (memq 'dummy services-prior))
+ (memq 'dummy (running-services marionette))))
+
+ (test-assert "script successfully evaluated"
+ (marionette-eval
+ '(primitive-load #$disable-dummy)
+ marionette))
+
+ (test-assert "script stopped obsolete service"
+ (not (memq 'dummy (running-services marionette)))))
+
+ (test-end)
+ (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+ (mlet* %store-monad ((file (ensure-service-file dummy-service)))
+ (let ((enable (upgrade-services-program (list file) '(dummy) '() '()))
+ (disable (upgrade-services-program '() '() '(dummy) '())))
+ (gexp->derivation "upgrade-services" (test enable disable)))))
+
+(define* (run-install-bootloader-test)
+ "Run a test of an OS running INSTALL-BOOTLOADER-PROGRAM, which installs a
+bootloader's configuration file."
+ (define os
+ (marionette-operating-system
+ (simple-operating-system)
+ #:imported-modules '((gnu services herd)
+ (guix combinators))))
+
+ (define vm (virtual-machine os))
+
+ (define (test script)
+ (with-imported-modules '((gnu build marionette))
+ #~(begin
+ (use-modules (gnu build marionette)
+ (ice-9 regex)
+ (srfi srfi-1)
+ (srfi srfi-64))
+
+ (define marionette
+ (make-marionette (list #$vm)))
+
+ ;; Return the system generation paths that have GRUB menu entries.
+ (define (generations-in-grub-cfg marionette)
+ (let ((grub-cfg (marionette-eval
+ '(begin
+ (call-with-input-file "/boot/grub/grub.cfg"
+ (lambda (port)
+ (get-string-all port))))
+ marionette)))
+ (map (lambda (parameter)
+ (second (string-split (match:substring parameter) #\=)))
+ (list-matches "system=[^ ]*" grub-cfg))))
+
+ (mkdir #$output)
+ (chdir #$output)
+
+ (test-begin "install-bootloader")
+
+ (test-assert "no prior menu entry for system generation"
+ (not (member #$os (generations-in-grub-cfg marionette))))
+
+ (test-assert "script successfully evaluated"
+ (marionette-eval
+ '(primitive-load #$script)
+ marionette))
+
+ (test-assert "menu entry created for system generation"
+ (member #$os (generations-in-grub-cfg marionette)))
+
+ (test-end)
+ (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+ (let* ((bootloader ((compose bootloader-configuration-bootloader
+ operating-system-bootloader)
+ os))
+ ;; The typical use-case for 'install-bootloader-program' is to read
+ ;; the boot parameters for the existing menu entries on the system,
+ ;; parse them with 'boot-parameters->menu-entry', and pass the
+ ;; results to 'operating-system-bootcfg'. However, to obtain boot
+ ;; parameters, we would need to start the marionette, which we should
+ ;; ideally avoid doing outside of the 'test' G-Expression. Thus, we
+ ;; generate a bootloader configuration for the script as if there
+ ;; were no existing menu entries. In the grand scheme of things, this
+ ;; matters little -- these tests should not make assertions about the
+ ;; behavior of 'operating-system-bootcfg'.
+ (bootcfg (operating-system-bootcfg os '()))
+ (bootcfg-file (bootloader-configuration-file bootloader)))
+ (gexp->derivation
+ "install-bootloader"
+ ;; Due to the read-only nature of the virtual machines used in the system
+ ;; test suite, the bootloader installer script is omitted. 'grub-install'
+ ;; would attempt to write directly to the virtual disk if the
+ ;; installation script were run.
+ (test (install-bootloader-program #f #f bootcfg bootcfg-file #f "/")))))
+
+(define %test-switch-to-system
+ (system-test
+ (name "switch-to-system")
+ (description "Create a new generation of the system profile.")
+ (value (run-switch-to-system-test))))
+
+(define %test-upgrade-services
+ (system-test
+ (name "upgrade-services")
+ (description "Upgrade the Shepherd by unloading obsolete services and
+loading new services.")
+ (value (run-upgrade-services-test))))
+
+(define %test-install-bootloader
+ (system-test
+ (name "install-bootloader")
+ (description "Install a bootloader and its configuration file.")
+ (value (run-install-bootloader-test))))
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