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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014 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 services xorg)
+ #:use-module (gnu services)
+ #:use-module (gnu system linux) ; 'pam-service'
+ #:use-module ((gnu packages base) #:select (guile-final))
+ #:use-module (gnu packages xorg)
+ #:use-module (gnu packages gl)
+ #:use-module (gnu packages slim)
+ #:use-module (gnu packages ratpoison)
+ #:use-module (gnu packages admin)
+ #:use-module (gnu packages bash)
+ #:use-module (guix monads)
+ #:use-module (guix derivations)
+ #:export (xorg-start-command
+ slim-service))
+
+;;; Commentary:
+;;;
+;;; Services that relate to the X Window System.
+;;;
+;;; Code:
+
+(define* (xorg-start-command #:key
+ (guile guile-final)
+ (xorg-server xorg-server))
+ "Return a derivation that builds a GUILE script to start the X server from
+XORG-SERVER. Usually the X server is started by a login manager."
+
+ (define (xserver.conf)
+ (text-file* "xserver.conf" "
+Section \"Files\"
+ FontPath \"" font-adobe75dpi "/share/font/X11/75dpi\"
+ ModulePath \"" xf86-video-vesa "/lib/xorg/modules/drivers\"
+ ModulePath \"" xf86-input-mouse "/lib/xorg/modules/input\"
+ ModulePath \"" xf86-input-keyboard "/lib/xorg/modules/input\"
+ ModulePath \"" xorg-server "/lib/xorg/modules\"
+ ModulePath \"" xorg-server "/lib/xorg/modules/extensions\"
+ ModulePath \"" xorg-server "/lib/xorg/modules/multimedia\"
+EndSection
+
+Section \"ServerFlags\"
+ Option \"AllowMouseOpenFail\" \"on""
+EndSection
+
+Section \"Monitor\"
+ Identifier \"Monitor[0]\"
+EndSection
+
+Section \"InputClass\"
+ Identifier \"Generic keyboard\"
+ MatchIsKeyboard \"on\"
+ Option \"XkbRules\" \"base\"
+ Option \"XkbModel\" \"pc104\"
+EndSection
+
+Section \"ServerLayout\"
+ Identifier \"Layout\"
+ Screen \"Screen-vesa\"
+EndSection
+
+Section \"Device\"
+ Identifier \"Device-vesa\"
+ Driver \"vesa\"
+EndSection
+
+Section \"Screen\"
+ Identifier \"Screen-vesa\"
+ Device \"Device-vesa\"
+EndSection"))
+
+ (mlet %store-monad ((guile-bin (package-file guile "bin/guile"))
+ (xorg-bin (package-file xorg-server "bin/X"))
+ (dri (package-file mesa "lib/dri"))
+ (xkbcomp-bin (package-file xkbcomp "bin"))
+ (xkb-dir (package-file xkeyboard-config
+ "share/X11/xkb"))
+ (config (xserver.conf)))
+ (define builder
+ ;; Write a small wrapper around the X server.
+ `(let ((out (assoc-ref %outputs "out")))
+ (call-with-output-file out
+ (lambda (port)
+ (format port "#!~a --no-auto-compile~%!#~%" ,guile-bin)
+ (write '(begin
+ (setenv "XORG_DRI_DRIVER_PATH" ,dri)
+ (setenv "XKB_BINDIR" ,xkbcomp-bin)
+
+ (apply execl
+
+ ,xorg-bin "-ac" "-logverbose" "-verbose"
+ "-xkbdir" ,xkb-dir
+ "-config" ,(derivation->output-path config)
+ "-nolisten" "tcp" "-terminate"
+
+ ;; Note: SLiM and other display managers add the
+ ;; '-auth' flag by themselves.
+ (cdr (command-line))))
+ port)))
+ (chmod out #o555)
+ #t))
+
+ (mlet %store-monad ((inputs (lower-inputs
+ `(("xorg" ,xorg-server)
+ ("xkbcomp" ,xkbcomp)
+ ("xkeyboard-config" ,xkeyboard-config)
+ ("mesa" ,mesa)
+ ("guile" ,guile)
+ ("xorg.conf" ,config)))))
+ (derivation-expression "start-xorg" builder
+ #:inputs inputs))))
+
+(define* (slim-service #:key (slim slim)
+ (allow-empty-passwords? #t) auto-login?
+ (default-user "")
+ (xauth xauth) (dmd dmd) (bash bash)
+ startx)
+ "Return a service that spawns the SLiM graphical login manager, which in
+turn start the X display server with STARTX, a command as returned by
+'xorg-start-command'.
+
+When ALLOW-EMPTY-PASSWORDS? is true, allow logins with an empty password.
+When AUTO-LOGIN? is true, log in automatically as DEFAULT-USER."
+ (define (slim.cfg)
+ ;; TODO: Run "bash -login ~/.xinitrc %session".
+ (mlet %store-monad ((startx (or startx (xorg-start-command))))
+ (text-file* "slim.cfg" "
+default_path /run/current-system/bin
+default_xserver " startx "
+xserver_arguments :0 vt7
+xauth_path " xauth "/bin/xauth
+authfile /var/run/slim.auth
+
+# The login command. '%session' is replaced by the chosen session name, one
+# of the names specified in the 'sessions' setting: 'wmaker', 'xfce', etc.
+login_cmd exec " ratpoison "/bin/ratpoison
+
+halt_cmd " dmd "/sbin/halt
+reboot_cmd " dmd "/sbin/reboot
+" (if auto-login?
+ (string-append "auto_login yes\ndefault_user " default-user)
+ ""))))
+
+ (mlet %store-monad ((slim-bin (package-file slim "bin/slim"))
+ (bash-bin (package-file bash "bin/bash"))
+ (slim.cfg (slim.cfg)))
+ (return
+ (service
+ (documentation "Xorg display server")
+ (provision '(xorg-server))
+ (requirement '(host-name))
+ (start
+ ;; XXX: Work around the inability to specify env. vars. directly.
+ `(make-forkexec-constructor
+ ,bash-bin "-c"
+ ,(string-append "SLIM_CFGFILE=" (derivation->output-path slim.cfg)
+ " " slim-bin
+ " -nodaemon")))
+ (stop `(make-kill-destructor))
+ (inputs `(("slim" ,slim)
+ ("slim.cfg" ,slim.cfg)
+ ("bash" ,bash)))
+ (respawn? #t)
+ (pam-services
+ ;; Tell PAM about 'slim'.
+ (list (unix-pam-service
+ "slim"
+ #:allow-empty-passwords? allow-empty-passwords?)))))))
+
+;;; xorg.scm ends here