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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.
131 lines
3.2 KiB
Nix
131 lines
3.2 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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cfg = dmcfg.slim;
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slimConfig = pkgs.writeText "slim.cfg"
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''
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xauth_path ${dmcfg.xauthBin}
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default_xserver ${dmcfg.xserverBin}
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xserver_arguments ${dmcfg.xserverArgs}
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sessiondir ${dmcfg.session.desktops}
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login_cmd exec ${pkgs.stdenv.shell} ${dmcfg.session.script} "%session"
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halt_cmd ${config.systemd.package}/sbin/shutdown -h now
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reboot_cmd ${config.systemd.package}/sbin/shutdown -r now
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${optionalString (cfg.defaultUser != null) ("default_user " + cfg.defaultUser)}
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${optionalString cfg.autoLogin "auto_login yes"}
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'';
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# Unpack the SLiM theme, or use the default.
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slimThemesDir =
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let
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unpackedTheme = pkgs.stdenv.mkDerivation {
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name = "slim-theme";
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buildCommand = ''
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ensureDir $out
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cd $out
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unpackFile ${cfg.theme}
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ln -s * default
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'';
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};
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in if cfg.theme == null then "${pkgs.slim}/share/slim/themes" else unpackedTheme;
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in
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{
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###### interface
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options = {
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services.xserver.displayManager.slim = {
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enable = mkOption {
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type = types.bool;
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default = config.services.xserver.enable;
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description = ''
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Whether to enable SLiM as the display manager.
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'';
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};
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theme = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = literalExample ''
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pkgs.fetchurl {
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url = http://download.berlios.de/slim/slim-wave.tar.gz;
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sha256 = "0ndr419i5myzcylvxb89m9grl2xyq6fbnyc3lkd711mzlmnnfxdy";
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}
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'';
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description = ''
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The theme for the SLiM login manager. If not specified, SLiM's
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default theme is used. See <link
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xlink:href='http://slim.berlios.de/themes01.php'/> for a
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collection of themes.
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'';
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};
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defaultUser = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "login";
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description = ''
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The default user to load. If you put a username here you
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get it automatically loaded into the username field, and
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the focus is placed on the password.
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'';
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};
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autoLogin = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Automatically log in as the default user.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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services.xserver.displayManager.job =
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{ preStart =
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''
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rm -f /var/log/slim.log
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'';
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environment =
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{ SLIM_CFGFILE = slimConfig;
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SLIM_THEMESDIR = slimThemesDir;
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};
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execCmd = "exec ${pkgs.slim}/bin/slim";
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};
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services.xserver.displayManager.sessionCommands =
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''
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# Export the config/themes for slimlock.
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export SLIM_THEMESDIR=${slimThemesDir}
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'';
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# Allow null passwords so that the user can login as root on the
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# installation CD.
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security.pam.services.slim = { allowNullPassword = true; startSession = true; };
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# Allow slimlock to work.
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security.pam.services.slimlock = {};
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environment.systemPackages = [ pkgs.slim ];
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};
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}
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