nixpkgs/modules/misc/locate.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption;
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.
'';
};
};
};
};
in
###### implementation
let
locatedb = "/var/cache/locatedb";
updatedbCmd =
"${config.services.locate.period} root " +
"mkdir -m 0755 -p $(dirname ${locatedb}) && " +
"nice -n 19 ${pkgs.utillinux}/bin/ionice -c 3 " +
"updatedb --localuser=nobody --output=${locatedb} > /var/log/updatedb 2>&1";
in
{
require = [
# ../../upstart-jobs/cron.nix # config.services.cron
options
];
services = {
cron = {
systemCronJobs =
pkgs.lib.optional
config.services.locate.enable
updatedbCmd;
};
};
}