shang: integrate file server

systems/shang/configuration.nix

@@ -35,6 +35,24 @@
 #    };
   };
 
+  # needed for the `user` option below
+  security.setuidPrograms = [ "mount.cifs" ];
+
+  fileSystems = let
+   serverpass = if (builtins.tryEval <serverpass>).success then
+     builtins.readFile <serverpass>
+     else builtins.throw ''Please specify a file that contains the
+       password to mount the fileserver and add it to the NIX_PATH
+       variable with key "serverpass".
+     '' ;
+  in {
+    "/home/fileserver" = {
+      device = "//fileserver/daten";
+      fsType = "cifs";
+      options = "user=ekettner,password=${serverpass},uid=eike,user";
+    };
+  };
+
   # Enable the X11 windowing system.
   services.xserver = {
     videoDrivers = [ "nouveau" ];