home: create 'modules/home' folder

Consolidating all modules under the same path, to clear out the
top-level directory.

modules/home/gpg/default.nix

@@ -0,0 +1,36 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.gpg;
+in
+{
+  options.my.home.gpg = with lib; {
+    enable = my.mkDisableOption "gpg configuration";
+
+    pinentry = mkOption {
+      type = types.str;
+      default = "tty";
+      example = "gtk2";
+      description = "Which pinentry interface to use";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    programs.gpg = {
+      enable = true;
+    };
+
+    services.gpg-agent = {
+      enable = true;
+      enableSshSupport = true; # One agent to rule them all
+      pinentryFlavor = cfg.pinentry;
+      extraConfig = ''
+        allow-loopback-pinentry
+      '';
+    };
+
+    home.shellAliases = {
+      # Sometime `gpg-agent` errors out...
+      reset-agent = "gpg-connect-agent updatestartuptty /bye";
+    };
+  };
+}