bicep: add git-mirroring service

modules/gickup/hardlink-files.nix

@@ -0,0 +1,42 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.services.gickup;
+in
+{
+  config = lib.mkIf cfg.enable {
+    # TODO: add a service that will look at the backed up files and hardlink
+    #       the ones that have a matching hash together to save space. This can
+    #       either run routinely (i.e. trigger by systemd-timer), or be activated
+    #       whenever a gickup@<slug>.service finishes. The latter is probably better.
+
+    # systemd.services."gickup-hardlink" = {
+    #   serviceConfig = {
+    #     Type = "oneshot";
+    #     ExecStart = let
+    #       script = pkgs.writeShellApplication {
+    #         name = "gickup-hardlink-files.sh";
+    #         runtimeInputs = [ pkgs.coreutils pkgs.jdupes ];
+    #         text = ''
+
+    #         '';
+    #       };
+    #     in lib.getExe script;
+
+    #     User = "gickup";
+    #     Group = "gickup";
+
+    #     BindPaths = lib.optionals (cfg.dataDir != "/var/lib/gickup") [
+    #       "${cfg.dataDir}:/var/lib/gickup"
+    #     ];
+
+    #     Slice = "system-gickup.slice";
+
+    #     StateDirectory = "gickup";
+
+    #     # Hardening options
+    #     # TODO:
+    #     PrivateNetwork = true;
+    #   };
+    # };
+  };
+}