Lock flakes and add inputs

common/main.nix

@@ -6,7 +6,6 @@
     ./fs.nix
     ./hw.nix
     ./net.nix
-    ./overlays.nix
     ./ssh.nix
     ./users.nix
   ];
@@ -38,11 +37,12 @@
 
   programs.zsh.enable = true;
   programs.zsh.histSize = 100000;
+  users.defaultUserShell = pkgs.zsh;
 
   # Copy the NixOS configuration file and link it from the resulting system
   # (/run/current-system/configuration.nix). This is useful in case you
   # accidentally delete configuration.nix.
-  system.copySystemConfiguration = true;
+  #system.copySystemConfiguration = true;
 
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions

common/overlays.nix

@@ -1,21 +1,9 @@
 { options, ... }:
 
-let
-
-  bscpkgsSrc = builtins.fetchTarball "https://pm.bsc.es/gitlab/rarias/bscpkgs/-/archive/master/bscpkgs-master.tar.gz";
-  bscpkgs = import "${bscpkgsSrc}/overlay.nix";
-
-in
-
 {
   nix.nixPath =
     # Prepend default nixPath values.
     options.nix.nixPath.default ++
     # Append our nixpkgs-overlays.
-    [ "nixpkgs-overlays=/config/overlays-compat/" ]
-  ;
-
-  nixpkgs.overlays = [
-    bscpkgs
-  ];
+    [ "nixpkgs-overlays=${../overlays-compat}" ];
 }