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.
117 lines
3.1 KiB
Nix
117 lines
3.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (config.services) jobsTags;
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# Put all the system cronjobs together.
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systemCronJobsFile = pkgs.writeText "system-crontab"
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''
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SHELL=${pkgs.bash}/bin/bash
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PATH=${config.system.path}/bin:${config.system.path}/sbin
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${optionalString (config.services.cron.mailto != null) ''
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MAILTO="${config.services.cron.mailto}"
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''}
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NIX_CONF_DIR=/etc/nix
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${pkgs.lib.concatStrings (map (job: job + "\n") config.services.cron.systemCronJobs)}
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'';
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# Vixie cron requires build-time configuration for the sendmail path.
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cronNixosPkg = pkgs.cron.override {
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# The mail.nix nixos module, if there is any local mail system enabled,
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# should have sendmail in this path.
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sendmailPath = "/var/setuid-wrappers/sendmail";
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};
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in
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{
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###### interface
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options = {
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services.cron = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = "Whether to enable the Vixie cron daemon.";
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};
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mailto = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "Email address to which job output will be mailed.";
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};
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systemCronJobs = mkOption {
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type = types.listOf types.str;
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default = [];
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example = literalExample ''
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[ "* * * * * test ls -l / > /tmp/cronout 2>&1"
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"* * * * * eelco echo Hello World > /home/eelco/cronout"
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]
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'';
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description = ''
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A list of Cron jobs to be appended to the system-wide
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crontab. See the manual page for crontab for the expected
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format. If you want to get the results mailed you must setuid
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sendmail. See <option>security.setuidOwners</option>
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If neither /var/cron/cron.deny nor /var/cron/cron.allow exist only root
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will is allowed to have its own crontab file. The /var/cron/cron.deny file
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is created automatically for you. So every user can use a crontab.
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Many nixos modules set systemCronJobs, so if you decide to disable vixie cron
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and enable another cron daemon, you may want it to get its system crontab
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based on systemCronJobs.
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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 = mkIf config.services.cron.enable {
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environment.etc = singleton
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# The system-wide crontab.
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{ source = systemCronJobsFile;
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target = "crontab";
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mode = "0600"; # Cron requires this.
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};
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security.setuidPrograms = [ "crontab" ];
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environment.systemPackages = [ cronNixosPkg ];
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jobs.cron =
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{ description = "Cron Daemon";
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startOn = "startup";
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path = [ cronNixosPkg ];
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preStart =
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''
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mkdir -m 710 -p /var/cron
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# By default, allow all users to create a crontab. This
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# is denoted by the existence of an empty cron.deny file.
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if ! test -e /var/cron/cron.allow -o -e /var/cron/cron.deny; then
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touch /var/cron/cron.deny
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fi
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'';
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exec = "cron -n";
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};
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};
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}
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