1 files changed, 62 insertions, 0 deletions
diff --git a/nixos/modules/misc/locate.nix b/nixos/modules/misc/locate.nix
new file mode 100644
index 00000000000..02b1ed7b63d
--- /dev/null
+++ b/nixos/modules/misc/locate.nix
@@ -0,0 +1,62 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  locatedb = "/var/cache/locatedb";
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.locate = {
+
+      enable = mkOption {
+        default = false;
+        example = true;
+        description = ''
+          If enabled, NixOS will periodically update the database of
+          files used by the <command>locate</command> command.
+        '';
+      };
+
+      period = mkOption {
+        default = "15 02 * * *";
+        description = ''
+          This option defines (in the format used by cron) when the
+          locate database is updated.
+          The default is to update at 02:15 (at night) every day.
+        '';
+      };
+
+    };
+
+  };
+
+  ###### implementation
+
+  config = {
+
+    systemd.services.update-locatedb =
+      { description = "Update Locate Database";
+        path  = [ pkgs.su ];
+        script =
+          ''
+            mkdir -m 0755 -p $(dirname ${locatedb})
+            exec updatedb --localuser=nobody --output=${locatedb} --prunepaths='/tmp /var/tmp /media /run'
+          '';
+        serviceConfig.Nice = 19;
+        serviceConfig.IOSchedulingClass = "idle";
+      };
+
+    services.cron.systemCronJobs = optional config.services.locate.enable
+      "${config.services.locate.period} root ${config.systemd.package}/bin/systemctl start update-locatedb.service";
+
+  };
+
+}