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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 L p R n d n <guix@lprndn.info>
+;;;
+;;; 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 services lightdm)
+ #:use-module (guix gexp)
+ #:use-module (guix records)
+
+ #:use-module (gnu system pam)
+ #:use-module (gnu system shadow)
+
+ #:use-module (gnu services)
+ #:use-module (gnu services dbus)
+ #:use-module (gnu services desktop)
+ #:use-module (gnu services shepherd)
+ #:use-module (gnu services xorg)
+
+ #:use-module (gnu packages admin)
+ #:use-module (gnu packages display-managers)
+ #:use-module (gnu packages freedesktop)
+ #:use-module (gnu packages gnome)
+ #:use-module (gnu packages xorg)
+
+ #:export (lightdm-configuration
+ lightdm-configuration?
+ lightdm-service-type
+ lightdm-gtk-greeter-configuration
+ lightdm-gtk-greeter-configuration-file))
+
+
+(define-record-type* <lightdm-gtk-greeter-configuration>
+ lightdm-gtk-greeter-configuration make-lightdm-gtk-greeter-configuration
+ lightdm-gtk-greeter-configuration?
+ (theme-name lightdm-gtk-greeter-configuration-theme-name
+ (default "Adwaita"))
+ (icon-theme-name
+ lightdm-gtk-greeter-configuration-icon-theme-name
+ (default "Adwaita"))
+ (cursor-theme-name
+ lightdm-gtk-greeter-configuration-cursor-theme-name
+ (default "Adwaita"))
+ (cursor-size lightdm-gtk-greeter-configuration-cursor-size
+ (default 16))
+ (background lightdm-gtk-greeter-configuration-background
+ (default "")))
+
+(define (lightdm-gtk-greeter-configuration-file config)
+ (mixed-text-file "lightdm-gtk-greeter.conf" "
+[greeter]
+theme-name = " (lightdm-gtk-greeter-configuration-theme-name config) "
+icon-theme-name = " (lightdm-gtk-greeter-configuration-icon-theme-name config) "
+cursor-theme-name = " (lightdm-gtk-greeter-configuration-cursor-theme-name config) "
+cursor-theme-size = " (number->string
+ (lightdm-gtk-greeter-configuration-cursor-size config)) "
+background = " (lightdm-gtk-greeter-configuration-background config)))
+
+(define-record-type* <lightdm-configuration>
+ lightdm-configuration make-lightdm-configuration
+ lightdm-configuration?
+
+ (lightdm lightdm-configuration-lightdm
+ (default lightdm))
+ (sessions-directory lightdm-configuration-sessions-directory
+ (default (string-append
+ "/run/current-system/profile/share/xsessions"
+ ":/run/current-system/profile/share/wayland-sessions")))
+ (allow-empty-passwords? lightdm-configuration-allow-empty-passwords?
+ (default #f))
+ ;; [Seat]
+ (xorg-configuration lightdm-configuration-xorg
+ (default (xorg-configuration)))
+ (session-wrapper lightdm-configuration-session-wrapper
+ (default (xinitrc)))
+ (default-session-name lightdm-configuration-default-session
+ (default ""))
+
+ ;; [Autologin]
+ (autologin-user lightdm-configuration-autologin-user
+ (default #f))
+ (autologin-timeout lightdm-configuration-autologin-timeout
+ (default #f))
+ ;; [Greeter]
+ (greeter-name lightdm-configuration-greeter-name
+ (default "lightdm-gtk-greeter"))
+ (greeter-package lightdm-configuration-greeter-package
+ (default lightdm-gtk-greeter))
+ (greeter-assets lightdm-configuration-greeter-assets
+ (default (list adwaita-icon-theme
+ gnome-themes-standard)))
+ (greeter-configuration-file lightdm-configuration-greeter-configuration
+ (default (lightdm-gtk-greeter-configuration-file
+ (lightdm-gtk-greeter-configuration)))))
+
+(define %lightdm-accounts
+ (list (user-group (name "lightdm") (system? #t))
+ (user-account
+ (name "lightdm")
+ (group "lightdm")
+ (system? #t)
+ (comment "LighDM user")
+ (home-directory "/var/lib/lightdm")
+ (shell (file-append shadow "/sbin/nologin")))))
+
+
+(define (lightdm-configuration-file config)
+ (mixed-text-file "lightdm.conf" "
+[LightDM]
+greeter-user = lightdm
+greeters-directory = /run/current-system/profile/share/xgreeters
+sessions-directory = " (lightdm-configuration-sessions-directory config) "
+
+
+[Seat:*]
+xserver-command = " (xorg-start-command (lightdm-configuration-xorg config)) "
+greeter-session = " (lightdm-configuration-greeter-name config) "
+user-session = " (lightdm-configuration-default-session config)
+(if (lightdm-configuration-autologin-user config) (string-append "
+autologin-user = " (lightdm-configuration-autologin-user config)) "")
+(if (string-null? (lightdm-configuration-default-session config)) ""
+ (string-append "
+autologin-session = " (lightdm-configuration-default-session config)))
+(if (lightdm-configuration-autologin-timeout config) (string-append "
+autologin-user-timeout = " (lightdm-configuration-autologin-timeout config)) "") "
+session-wrapper = " (lightdm-configuration-session-wrapper config)))
+
+
+(define (lightdm-pam-service config)
+ "Return a PAM service for @command{lightdm}."
+ (unix-pam-service
+ "lightdm"
+ #:allow-empty-passwords?
+ (lightdm-configuration-allow-empty-passwords? config)))
+
+
+(define (lightdm-greeter-pam-service)
+ "Return a PAM service for @command{lightdm-greeter}}."
+ (pam-service
+ (name "lightdm-greeter")
+ (auth
+ (list
+ ;; Load environment from /etc/environment and ~/.pam_environment
+ (pam-entry (control "required") (module "pam_env.so"))
+ ;; Always let the greeter start without authentication
+ (pam-entry (control "required") (module "pam_permit.so"))))
+ ;; No action required for account management
+ (account
+ (list
+ (pam-entry (control "required") (module "pam_permit.so"))))
+ ;; Can't change password
+ (password
+ (list
+ (pam-entry (control "required") (module "pam_deny.so"))))
+ ;; Setup session
+ (session
+ (list
+ (pam-entry (control "required") (module "pam_unix.so"))
+ (pam-entry (control "required") (module "pam_env.so"))))))
+
+
+(define (lightdm-autologin-pam-service)
+ "Return a PAM service for @command{lightdm-autologin}}."
+ (pam-service
+ (name "lightdm-autologin")
+ (auth
+ (list
+ ;; Block login if they are globally disabled
+ (pam-entry (control "required") (module "pam_nologin.so"))
+ ;; Load environment from /etc/environment and ~/.pam_environment
+ (pam-entry (control "required") (module "pam_env.so"))
+ ;; Allow access without authentication
+ (pam-entry (control "required") (module "pam_permit.so"))))
+ ;; Stop autologin if account requires action
+ (account
+ (list
+ (pam-entry (control "required") (module "pam_unix.so"))))
+ ;; Can't change password
+ (password
+ (list
+ (pam-entry (control "required") (module "pam_deny.so"))))
+ ;; Setup session
+ (session
+ (list
+ (pam-entry (control "required") (module "pam_unix.so"))))))
+
+
+(define (lightdm-shepherd-service config)
+ "Return a <lightdm-service> for LightDM with CONFIG."
+
+ (define lightdm-command
+ #~(list (string-append #$(lightdm-configuration-lightdm config) "/sbin/lightdm")))
+
+ (list (shepherd-service
+ (documentation "LightDM display manager.")
+ (requirement '(dbus-system user-processes host-name))
+ (provision '(display-manager))
+ (respawn? #f)
+ (start #~(lambda ()
+ (fork+exec-command
+ (list #$(file-append
+ (lightdm-configuration-lightdm config)
+ "/sbin/lightdm"))
+ #:environment-variables
+ (list
+ (string-append
+ "PATH=/run/current-system/profile/sbin"
+ ":/run/current-system/profile/bin")))))
+ (stop #~(make-kill-destructor)))))
+
+(define (lightdm-etc-service config)
+ (list `("xdg/lightdm/lightdm.conf.d/lightdm.conf"
+ ,(lightdm-configuration-file config))
+ `(,(string-append "xdg/lightdm/"
+ (computed-file-name
+ (lightdm-configuration-greeter-configuration config)))
+ ,(lightdm-configuration-greeter-configuration config))))
+
+(define (lightdm-pam-services config)
+ (list (lightdm-pam-service config)
+ (lightdm-greeter-pam-service)
+ (lightdm-autologin-pam-service)))
+
+(define (lightdm-profile-service config)
+ (append (list lightdm
+ (lightdm-configuration-greeter-package config))
+ (lightdm-configuration-greeter-assets config)))
+
+(define (lightdm-activation-service config)
+ (with-imported-modules '((guix build utils))
+ #~(begin
+ (use-modules (guix build utils))
+ (define %user
+ (getpw "lightdm"))
+ (let ((directory "/var/lib/lightdm-data"))
+ (mkdir-p directory)
+ (chown directory (passwd:uid %user) (passwd:gid %user))))))
+
+(define lightdm-service-type
+ (service-type (name 'lightdm)
+ (extensions
+ (list
+ (service-extension shepherd-root-service-type
+ lightdm-shepherd-service)
+ (service-extension activation-service-type
+ lightdm-activation-service)
+ (service-extension pam-root-service-type
+ lightdm-pam-services)
+ (service-extension etc-service-type
+ lightdm-etc-service)
+ (service-extension dbus-root-service-type
+ (compose list lightdm-configuration-lightdm))
+ (service-extension account-service-type
+ (const %lightdm-accounts))
+ (service-extension profile-service-type
+ lightdm-profile-service)))
+ (default-value (lightdm-configuration))
+ (description "Return a service that spawns the LightDM graphical login
+ manager.")))
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