1 files changed, 151 insertions, 0 deletions
diff --git a/nixos/modules/services/x11/display-managers/kdm.nix b/nixos/modules/services/x11/display-managers/kdm.nix
new file mode 100644
index 00000000000..229ab12c6e1
--- /dev/null
+++ b/nixos/modules/services/x11/display-managers/kdm.nix
@@ -0,0 +1,151 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  dmcfg = config.services.xserver.displayManager;
+  cfg = dmcfg.kdm;
+
+  inherit (pkgs.kde4) kdebase_workspace;
+
+  defaultConfig =
+    ''
+      [Shutdown]
+      HaltCmd=${config.systemd.package}/sbin/shutdown -h now
+      RebootCmd=${config.systemd.package}/sbin/shutdown -r now
+      ${optionalString (config.system.boot.loader.id == "grub") ''
+        BootManager=${if config.boot.loader.grub.version == 2 then "Grub2" else "Grub"}
+      ''}
+
+      [X-*-Core]
+      Xrdb=${pkgs.xlibs.xrdb}/bin/xrdb
+      SessionsDirs=${dmcfg.session.desktops}
+      Session=${dmcfg.session.script}
+      FailsafeClient=${pkgs.xterm}/bin/xterm
+
+      [X-:*-Core]
+      ServerCmd=${dmcfg.xserverBin} ${dmcfg.xserverArgs}
+      # KDM calls `rm' somewhere to clean up some temporary directory.
+      SystemPath=${pkgs.coreutils}/bin
+      # The default timeout (15) is too short in a heavily loaded boot process.
+      ServerTimeout=60
+      # Needed to prevent the X server from dying on logout and not coming back:
+      TerminateServer=true
+      ${optionalString (cfg.setupScript != "")
+      ''
+        Setup=${cfg.setupScript}
+      ''} 
+
+      [X-*-Greeter]
+      HiddenUsers=root,nixbld1,nixbld2,nixbld3,nixbld4,nixbld5,nixbld6,nixbld7,nixbld8,nixbld9,nixbld10
+      PluginsLogin=${kdebase_workspace}/lib/kde4/kgreet_classic.so
+      ${optionalString (cfg.themeDirectory != "")
+      ''
+        UseTheme=true
+        Theme=${cfg.themeDirectory}
+      ''
+      }
+
+      ${optionalString (cfg.enableXDMCP)
+      ''
+        [Xdmcp]
+        Enable=true
+      ''}
+    '';
+
+  kdmrc = pkgs.stdenv.mkDerivation {
+    name = "kdmrc";
+    config = defaultConfig + cfg.extraConfig;
+    buildCommand =
+      ''
+        echo "$config" > $out
+
+        # The default kdmrc would add "-nolisten tcp", and we already
+        # have that managed by nixos. Hence the grep.
+        cat ${kdebase_workspace}/share/config/kdm/kdmrc | grep -v nolisten >> $out
+      '';
+  };
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.xserver.displayManager.kdm = {
+
+      enable = mkOption {
+        default = false;
+        description = ''
+          Whether to enable the KDE display manager.
+        '';
+      };
+
+      enableXDMCP = mkOption {
+        default = false;
+        description = ''
+          Whether to enable XDMCP, which allows remote logins.
+        '';
+      };
+
+      themeDirectory = mkOption {
+        default = "";
+        description = ''
+          The path to a KDM theme directory. This theme
+          will be used by the KDM greeter.
+        '';
+      };
+
+      setupScript = mkOption {
+        default = "";
+        description = ''
+          The path to a KDM setup script. This script is run as root just
+          before KDM starts. Can be used for setting up
+          monitors with xrandr, for example.
+        '';
+      };
+
+      extraConfig = mkOption {
+        default = "";
+        description = ''
+          Options appended to <filename>kdmrc</filename>, the
+          configuration file of KDM.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    services.xserver.displayManager.slim.enable = false;
+
+    services.xserver.displayManager.job =
+      { execCmd =
+          ''
+            mkdir -m 0755 -p /var/lib/kdm
+            chown kdm /var/lib/kdm
+            ${(optionalString (config.system.boot.loader.id == "grub" && config.system.build.grub != null) "PATH=${config.system.build.grub}/sbin:$PATH ") +
+              "KDEDIRS=/run/current-system/sw exec ${kdebase_workspace}/bin/kdm -config ${kdmrc} -nodaemon"}
+          '';
+        logsXsession = true;
+      };
+
+    security.pam.services = [ { name = "kde"; allowNullPassword = true; startSession = true; } ];
+
+    users.extraUsers = singleton
+      { name = "kdm";
+        uid = config.ids.uids.kdm;
+        description = "KDM user";
+      };
+
+  };
+
+}