nixpkgs-suyu/modules/services/scheduling/cron.nix
Lluís Batlle i Rossell dc11ce585f Making vixie cron have the usual enable/disable nixos service option.
svn path=/nixos/trunk/; revision=24198
2010-10-10 11:14:02 +00:00

106 lines
2.7 KiB
Nix

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