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https://github.com/NixOS/nixpkgs
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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
121 lines
3.4 KiB
Nix
121 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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dmcfg = config.services.xserver.displayManager;
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xEnv = config.systemd.services."display-manager".environment;
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cfg = dmcfg.lightdm;
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inherit (pkgs) stdenv lightdm writeScript writeText;
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# lightdm runs with clearenv(), but we need a few things in the enviornment for X to startup
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xserverWrapper = writeScript "xserver-wrapper"
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''
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#! /bin/sh
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${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
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exec ${dmcfg.xserverBin} ${dmcfg.xserverArgs}
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'';
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# The default greeter provided with this expression is the GTK greeter.
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# Again, we need a few things in the environment for the greeter to run with
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# fonts/icons.
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wrappedGtkGreeter = stdenv.mkDerivation {
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name = "lightdm-gtk-greeter";
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buildInputs = [ pkgs.makeWrapper ];
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buildCommand = ''
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ensureDir $out/gtk-3.0/
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# This wrapper ensures that we actually get fonts
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makeWrapper ${pkgs.lightdm_gtk_greeter}/sbin/lightdm-gtk-greeter \
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$out/greeter \
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--set XDG_DATA_DIRS ${pkgs.gnome2.gnome_icon_theme}/share \
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--set FONTCONFIG_FILE /etc/fonts/fonts.conf \
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--set XDG_CONFIG_HOME $out/
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# We need this to ensure that it actually tries to find icons from gnome-icon-theme
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cat - > $out/gtk-3.0/settings.ini << EOF
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[Settings]
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gtk-icon-theme-name=gnome
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EOF
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cat - > $out/lightdm-gtk-greeter.desktop << EOF
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[Desktop Entry]
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Name=LightDM Greeter
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Comment=This runs the LightDM Greeter
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Exec=$out/greeter
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Type=Application
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EOF
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'';
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};
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lightdmConf = writeText "lightdm.conf"
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''
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[LightDM]
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greeter-user = ${config.users.extraUsers.lightdm.name}
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greeters-directory = ${cfg.greeter.package}
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sessions-directory = ${dmcfg.session.desktops}
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[SeatDefaults]
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xserver-command = ${xserverWrapper}
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session-wrapper = ${dmcfg.session.script}
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greeter-session = ${cfg.greeter.name}
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'';
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in
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{
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options = {
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services.xserver.displayManager.lightdm = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable lightdm as the display manager.
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'';
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};
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greeter = mkOption {
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description = ''
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The LightDM greeter to login via. The package should be a directory
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containing a .desktop file matching the name in the 'name' option.
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'';
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default = {
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name = "lightdm-gtk-greeter";
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package = wrappedGtkGreeter;
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};
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};
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};
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};
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config = mkIf cfg.enable {
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services.xserver.displayManager.slim.enable = false;
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services.xserver.displayManager.job = {
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logsXsession = true;
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# lightdm relaunches itself via just `lightdm`, so needs to be on the PATH
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execCmd = ''
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export PATH=${lightdm}/sbin:$PATH
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${lightdm}/sbin/lightdm --log-dir=/var/log --run-dir=/run --config=${lightdmConf}
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'';
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};
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services.dbus.enable = true;
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services.dbus.packages = [ lightdm ];
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security.pam.services.lightdm = { allowNullPassword = true; startSession = true; };
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security.pam.services.lightdm-greeter = { allowNullPassword = true; startSession = true; };
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users.extraUsers.lightdm = {
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createHome = true;
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home = "/var/lib/lightdm";
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group = "lightdm";
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uid = config.ids.uids.lightdm;
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};
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users.extraGroups.lightdm.gid = config.ids.gids.lightdm;
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};
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}
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