29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
63 lines
1.3 KiB
Nix
63 lines
1.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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locatedb = "/var/cache/locatedb";
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in
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{
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###### interface
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options = {
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services.locate = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, NixOS will periodically update the database of
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files used by the <command>locate</command> command.
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'';
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};
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period = mkOption {
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type = types.str;
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default = "15 02 * * *";
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description = ''
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This option defines (in the format used by cron) when the
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locate database is updated.
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The default is to update at 02:15 at night every day.
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'';
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};
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};
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};
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###### implementation
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config = {
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systemd.services.update-locatedb =
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{ description = "Update Locate Database";
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path = [ pkgs.su ];
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script =
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''
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mkdir -m 0755 -p $(dirname ${locatedb})
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exec updatedb --localuser=nobody --output=${locatedb} --prunepaths='/tmp /var/tmp /media /run'
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'';
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serviceConfig.Nice = 19;
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serviceConfig.IOSchedulingClass = "idle";
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};
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services.cron.systemCronJobs = optional config.services.locate.enable
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"${config.services.locate.period} root ${config.systemd.package}/bin/systemctl start update-locatedb.service";
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};
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}
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