add borgmatic darwin module

darwin-modules/borgmatic.nix

@@ -0,0 +1,83 @@
+{ pkgs, lib, config, ... }:
+with lib;
+let
+  cfg = config.ragon.services.borgmatic;
+  settingsFormat = pkgs.formats.yaml { };
+  cfgType = with types; submodule {
+    freeformType = settingsFormat.type;
+    options.location = {
+      source_directories = mkOption {
+        type = listOf str;
+        description = mdDoc ''
+          List of source directories to backup (required). Globs and
+          tildes are expanded.
+        '';
+        example = [ "/home" "/etc" "/var/log/syslog*" ];
+      };
+      repositories = mkOption {
+        type = listOf str;
+        description = mdDoc ''
+          Paths to local or remote repositories (required). Tildes are
+          expanded. Multiple repositories are backed up to in
+          sequence. Borg placeholders can be used. See the output of
+          "borg help placeholders" for details. See ssh_command for
+          SSH options like identity file or port. If systemd service
+          is used, then add local repository paths in the systemd
+          service file to the ReadWritePaths list.
+        '';
+        example = [
+          "ssh://user@backupserver/./sourcehostname.borg"
+          "ssh://user@backupserver/./{fqdn}"
+          "/var/local/backups/local.borg"
+        ];
+      };
+    };
+  };
+  cfgfile = settingsFormat.generate "config.yaml" cfg.settings;
+in
+{
+  options.ragon.services.borgmatic = {
+    enable = mkEnableOption (mdDoc "borgmatic");
+
+    settings = mkOption {
+      description = mdDoc ''
+        See https://torsion.org/borgmatic/docs/reference/configuration/
+      '';
+      default = null;
+      type = types.nullOr cfgType;
+    };
+
+    configurations = mkOption {
+      description = mdDoc ''
+        Set of borgmatic configurations, see https://torsion.org/borgmatic/docs/reference/configuration/
+      '';
+      default = { };
+      type = types.attrsOf cfgType;
+    };
+  };
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.borgmatic ];
+
+    environment.etc = (optionalAttrs (cfg.settings != null) { "borgmatic/config.yaml".source = cfgfile; }) //
+      mapAttrs'
+        (name: value: nameValuePair
+          "borgmatic.d/${name}.yaml"
+          { source = settingsFormat.generate "${name}.yaml" value; })
+        cfg.configurations;
+
+    launchd.agents.borgmatic = {
+      script = "borgmatic";
+      serviceConfig = {
+        StartInterval = 60 * 60; # run every hour
+        label = "xyz.ragon.borgmatic";
+        StandardOutPath = "/var/log/borgmatic.log";
+        StandardErrorPath = "/var/log/borgmatic.log.error";
+        NetworkState = true;
+        Nice = 1;
+      };
+    };
+  };
+
+
+}