Replace path with nix/store path

config/sudoers

@@ -2,7 +2,7 @@
 # or ‘security.sudo.extraRules’ instead.
 
 # Set editor to nvim
-Defaults editor=/run/current-system/sw/bin/nvim
+Defaults editor=${pkgs.neovim}/bin/nvim
 
 # Keep SSH_AUTH_SOCK so that pam_ssh_agent_auth.so can do its magic.
 Defaults env_keep+=SSH_AUTH_SOCK

home-manager.nix

@@ -80,6 +80,7 @@ in
       };
       # user environment variables
       sessionVariables = {
+        # see https://discourse.nixos.org/t/how-to-use-xdg-runtime-dir-in-pam-sessionvariables/10120/3 about the builtin variable
         SSH_AUTH_SOCK = "${builtins.getEnv"XDG_RUNTIME_DIR"}/ssh-agent.socket";
       };
     };