cachefilesd service: init

nixos/modules/module-list.nix

@@ -312,6 +312,7 @@
   ./services/monitoring/uptime.nix
   ./services/monitoring/zabbix-agent.nix
   ./services/monitoring/zabbix-server.nix
+  ./services/network-filesystems/cachefilesd.nix
   ./services/network-filesystems/drbd.nix
   ./services/network-filesystems/netatalk.nix
   ./services/network-filesystems/nfsd.nix

nixos/modules/services/network-filesystems/cachefilesd.nix

@@ -0,0 +1,59 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.cachefilesd;
+
+  cfgFile = pkgs.writeText "cachefilesd.conf" ''
+    dir ${cfg.cacheDir}
+    ${cfg.extraConfig}
+  '';
+
+in
+
+{
+  options = {
+    services.cachefilesd = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable cachefilesd network filesystems caching daemon.";
+      };
+
+      cacheDir = mkOption {
+        type = types.str;
+        default = "/var/cache/fscache";
+        description = "Directory to contain filesystem cache.";
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        example = "brun 10%";
+        description = "Additional configuration file entries. See cachefilesd.conf(5) for more information.";
+      };
+
+    };
+  };
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    systemd.services.cachefilesd = {
+      description = "Local network file caching management daemon";
+      wantedBy = [ "multi-user.target" ];
+      path = [ pkgs.kmod pkgs.cachefilesd ];
+      script = ''
+        modprobe -qab cachefiles
+        mkdir -p ${cfg.cacheDir}
+        chmod 700 ${cfg.cacheDir}
+        exec cachefilesd -n -f ${cfgFile}
+      '';
+    };
+
+  };
+}