nixpkgs/upstart-jobs/cron.nix

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{pkgs, config, ...}:
###### interface
let
inherit (pkgs.lib) mkOption;
options = {
services = {
cron = {
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>
'';
};
};
};
};
in
###### implementation
let
# Put all the system cronjobs together.
systemCronJobs =
config.services.cron.systemCronJobs;
systemCronJobsFile = pkgs.writeText "system-crontab" ''
SHELL=${pkgs.bash}/bin/sh
PATH=${pkgs.coreutils}/bin:${pkgs.findutils}/bin:${pkgs.gnused}/bin:${pkgs.su}/bin
MAILTO="${config.services.cron.mailto}"
${pkgs.lib.concatStrings (map (job: job + "\n") systemCronJobs)}
'';
in
{
require = [
# (import ../upstart-jobs/default.nix) # config.services.extraJobs
# (import ?) # config.time.timeZone
# (import ?) # config.environment.etc
# (import ?) # config.environment.extraPackages
# (import ?) # config.environment.cleanStart
options
];
environment = {
etc = [
# The system-wide crontab.
{ source = systemCronJobsFile;
target = "crontab";
mode = "0600"; # Cron requires this.
}
];
extraPackages =
pkgs.lib.optional
(!config.environment.cleanStart)
pkgs.cron;
};
services = {
extraJobs = [{
name = "cron";
job = ''
description "Cron daemon"
start on startup
stop on shutdown
# Needed to interpret times in the local timezone.
env TZ=${config.time.timeZone}
respawn ${pkgs.cron}/sbin/cron -n
'';
}];
};
}