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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 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 installer tests)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-34)
+ #:use-module (srfi srfi-35)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 regex)
+ #:use-module (ice-9 pretty-print)
+ #:export (&pattern-not-matched
+ pattern-not-matched?
+
+ %installer-socket-file
+ open-installer-socket
+
+ converse
+ conversation-log-port
+
+ choose-locale+keyboard
+ enter-host-name+passwords
+ choose-services
+ choose-partitioning
+ conclude-installation
+
+ edit-configuration-file))
+
+;;; Commentary:
+;;;
+;;; This module provides tools to test the guided "graphical" installer in a
+;;; non-interactive fashion. The core of it is 'converse': it allows you to
+;;; state Expect-style dialogues, which happen over the Unix-domain socket the
+;;; installer listens to. Higher-level procedures such as
+;;; 'choose-locale+keyboard' are provided to perform specific parts of the
+;;; dialogue.
+;;;
+;;; Code:
+
+(define %installer-socket-file
+ ;; Socket the installer listens to.
+ "/var/guix/installer-socket")
+
+(define* (open-installer-socket #:optional (file %installer-socket-file))
+ "Return a socket connected to the installer."
+ (let ((sock (socket AF_UNIX SOCK_STREAM 0)))
+ (connect sock AF_UNIX file)
+ sock))
+
+(define-condition-type &pattern-not-matched &error
+ pattern-not-matched?
+ (pattern pattern-not-matched-pattern)
+ (sexp pattern-not-matched-sexp))
+
+(define (pattern-error pattern sexp)
+ (raise (condition
+ (&pattern-not-matched
+ (pattern pattern) (sexp sexp)))))
+
+(define conversation-log-port
+ ;; Port where debugging info is logged
+ (make-parameter (current-error-port)))
+
+(define (converse-debug pattern)
+ (format (conversation-log-port)
+ "conversation expecting pattern ~s~%"
+ pattern))
+
+(define-syntax converse
+ (lambda (s)
+ "Convert over PORT: read sexps from there, match them against each
+PATTERN, and send the corresponding REPLY. Raise to '&pattern-not-matched'
+when one of the PATTERNs is not matched."
+
+ ;; XXX: Strings that appear in PATTERNs must be in the language the
+ ;; installer is running in. In the future, we should add support to allow
+ ;; writing English strings in PATTERNs and have the pattern matcher
+ ;; automatically translate them.
+
+ ;; Here we emulate 'pmatch' syntax on top of 'match'. This is ridiculous
+ ;; but that's because 'pmatch' compares objects with 'eq?', making it
+ ;; pretty useless, and it doesn't support ellipses and such.
+
+ (define (quote-pattern s)
+ ;; Rewrite the pattern S from pmatch style (a ,b) to match style like
+ ;; ('a b).
+ (with-ellipsis :::
+ (syntax-case s (unquote _ ...)
+ ((unquote id) #'id)
+ (_ #'_)
+ (... #'...)
+ (id
+ (identifier? #'id)
+ #''id)
+ ((lst :::) (map quote-pattern #'(lst :::)))
+ (pattern #'pattern))))
+
+ (define (match-pattern s)
+ ;; Match one pattern without a guard.
+ (syntax-case s ()
+ ((port (pattern reply) continuation)
+ (with-syntax ((pattern (quote-pattern #'pattern)))
+ #'(let ((pat 'pattern))
+ (converse-debug pat)
+ (match (read port)
+ (pattern
+ (let ((data (call-with-values (lambda () reply)
+ list)))
+ (for-each (lambda (obj)
+ (write obj port)
+ (newline port))
+ data)
+ (force-output port)
+ (continuation port)))
+ (sexp
+ (pattern-error pat sexp))))))))
+
+ (syntax-case s ()
+ ((_ port (pattern reply) rest ...)
+ (match-pattern #'(port (pattern reply)
+ (lambda (port)
+ (converse port rest ...)))))
+ ((_ port (pattern guard reply) rest ...)
+ #`(let ((skip? (not guard))
+ (next (lambda (p)
+ (converse p rest ...))))
+ (if skip?
+ (next port)
+ #,(match-pattern #'(port (pattern reply) next)))))
+ ((_ port)
+ #t))))
+
+(define* (choose-locale+keyboard port
+ #:key
+ (language "English")
+ (location "Hong Kong")
+ (timezone '("Europe" "Zagreb"))
+ (keyboard
+ '("English (US)"
+ "English (intl., with AltGr dead keys)")))
+ "Converse over PORT with the guided installer to choose the specified
+LANGUAGE, LOCATION, TIMEZONE, and KEYBOARD."
+ (converse port
+ ((list-selection (title "Locale language")
+ (multiple-choices? #f)
+ (items _))
+ language)
+ ((list-selection (title "Locale location")
+ (multiple-choices? #f)
+ (items _))
+ location)
+ ((menu (title "GNU Guix install")
+ (text _)
+ (items (,guided _ ...))) ;"Guided graphical installation"
+ guided)
+ ((list-selection (title "Timezone")
+ (multiple-choices? #f)
+ (items _))
+ (first timezone))
+ ((list-selection (title "Timezone")
+ (multiple-choices? #f)
+ (items _))
+ (second timezone))
+ ((list-selection (title "Layout")
+ (multiple-choices? #f)
+ (items _))
+ (first keyboard))
+ ((list-selection (title "Variant")
+ (multiple-choices? #f)
+ (items _))
+ (second keyboard))))
+
+(define* (enter-host-name+passwords port
+ #:key
+ (host-name "guix")
+ (root-password "foo")
+ (users '(("alice" "pass1")
+ ("bob" "pass2")
+ ("charlie" "pass3"))))
+ "Converse over PORT with the guided installer to choose HOST-NAME,
+ROOT-PASSWORD, and USERS."
+ (converse port
+ ((input (title "Hostname") (text _) (default _))
+ host-name)
+ ((input (title "System administrator password") (text _) (default _))
+ root-password)
+ ((input (title "Password confirmation required") (text _) (default _))
+ root-password)
+ ((add-users)
+ (match users
+ (((names passwords) ...)
+ (map (lambda (name password)
+ `(user (name ,name) (real-name ,(string-titlecase name))
+ (home-directory ,(string-append "/home/" name))
+ (password ,password)))
+ names passwords))))))
+
+(define* (choose-services port
+ #:key
+ (desktop-environments '("GNOME"))
+ (choose-network-service?
+ (lambda (service)
+ (or (string-contains service "SSH")
+ (string-contains service "NSS"))))
+ (choose-network-management-tool?
+ (lambda (service)
+ (string-contains service "DHCP"))))
+ "Converse over PORT to choose networking services."
+ (converse port
+ ((checkbox-list (title "Desktop environment") (text _)
+ (items _))
+ desktop-environments)
+ ((checkbox-list (title "Network service") (text _)
+ (items ,services))
+ (filter choose-network-service? services))
+
+ ;; The "Network management" dialog shows up only when no desktop
+ ;; environments have been selected, hence the guard.
+ ((list-selection (title "Network management")
+ (multiple-choices? #f)
+ (items ,services))
+ (null? desktop-environments)
+ (find choose-network-management-tool? services))))
+
+(define (edit-configuration-file file)
+ "Edit FILE, an operating system configuration file generated by the
+installer, by adding a marionette service such that the installed OS is
+instrumented for further testing."
+ (define (read-expressions port)
+ (let loop ((result '()))
+ (match (read port)
+ ((? eof-object?)
+ (reverse result))
+ (exp
+ (loop (cons exp result))))))
+
+ (define (edit exp)
+ (match exp
+ (('operating-system _ ...)
+ `(marionette-operating-system ,exp
+ #:imported-modules
+ '((gnu services herd)
+ (guix build utils)
+ (guix combinators))))
+ (_
+ exp)))
+
+ (let ((content (call-with-input-file file read-expressions)))
+ (call-with-output-file file
+ (lambda (port)
+ (format port "\
+;; Operating system configuration edited for automated testing.~%~%")
+
+ (pretty-print '(use-modules (gnu tests)) port)
+ (for-each (lambda (exp)
+ (pretty-print (edit exp) port)
+ (newline port))
+ content)))
+
+ #t))
+
+(define* (choose-partitioning port
+ #:key
+ (encrypted? #t)
+ (passphrase "thepassphrase")
+ (edit-configuration-file
+ edit-configuration-file))
+ "Converse over PORT to choose the partitioning method. When ENCRYPTED? is
+true, choose full-disk encryption with PASSPHRASE as the LUKS passphrase.
+This conversation goes past the final dialog box that shows the configuration
+file, actually starting the installation process."
+ (converse port
+ ((list-selection (title "Partitioning method")
+ (multiple-choices? #f)
+ (items (,not-encrypted ,encrypted _ ...)))
+ (if encrypted?
+ encrypted
+ not-encrypted))
+ ((list-selection (title "Disk") (multiple-choices? #f)
+ (items (,disk _ ...)))
+ disk)
+
+ ;; The "Partition table" dialog pops up only if there's not already a
+ ;; partition table.
+ ((list-selection (title "Partition table")
+ (multiple-choices? #f)
+ (items _))
+ "gpt")
+ ((list-selection (title "Partition scheme")
+ (multiple-choices? #f)
+ (items (,one-partition _ ...)))
+ one-partition)
+ ((list-selection (title "Guided partitioning")
+ (multiple-choices? #f)
+ (items (,disk _ ...)))
+ disk)
+ ((input (title "Password required")
+ (text _) (default #f))
+ encrypted? ;only when ENCRYPTED?
+ passphrase)
+ ((input (title "Password confirmation required")
+ (text _) (default #f))
+ encrypted?
+ passphrase)
+ ((confirmation (title "Format disk?") (text _))
+ #t)
+ ((info (title "Preparing partitions") _ ...)
+ (values)) ;nothing to return
+ ((file-dialog (title "Configuration file")
+ (text _)
+ (file ,configuration-file))
+ (edit-configuration-file configuration-file))))
+
+(define (conclude-installation port)
+ "Conclude the installation by checking over PORT that we get the final
+messages once the 'guix system init' process has completed."
+ (converse port
+ ((pause) ;"Press Enter to continue."
+ #t)
+ ((installation-complete) ;congratulations!
+ (values))))
+
+;;; Local Variables:
+;;; eval: (put 'converse 'scheme-indent-function 1)
+;;; eval: (put 'with-ellipsis 'scheme-indent-function 1)
+;;; End:
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