nixpkgs/nixos/modules/services/scheduling/fcron.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.fcron;
queuelen = if cfg.queuelen == "" then "" else "-q ${toString cfg.queuelen}";
systemCronJobs =
''
SHELL=${pkgs.bash}/bin/bash
PATH=${config.system.path}/bin:${config.system.path}/sbin
MAILTO="${config.services.cron.mailto}"
NIX_CONF_DIR=/etc/nix
${pkgs.lib.concatStrings (map (job: job + "\n") config.services.cron.systemCronJobs)}
'';
allowdeny = target: users:
{ source = pkgs.writeText "fcron.${target}" (concatStringsSep "\n" users);
target = "fcron.${target}";
mode = "600"; # fcron has some security issues.. So I guess this is most safe
};
in
{
###### interface
options = {
services.fcron = {
enable = mkOption {
default = false;
description = "Whether to enable the `fcron' daemon.";
};
allow = mkOption {
default = [ "all" ];
description = ''
Users allowed to use fcrontab and fcrondyn (one name per line, "all" for everyone).
'';
};
deny = mkOption {
default = [];
description = "Users forbidden from using fcron.";
};
maxSerialJobs = mkOption {
default = 1;
description = "Maximum number of serial jobs which can run simultaneously.";
};
queuelen = mkOption {
default = "";
description = "Number of jobs the serial queue and the lavg queue can contain - empty to net set this number (-q)";
};
systab = mkOption {
default = "";
description = ''The "system" crontab contents.'';
};
};
};
###### implementation
config = mkIf cfg.enable {
services.fcron.systab = systemCronJobs;
environment.etc =
[ (allowdeny "allow" (cfg.allow))
(allowdeny "deny" cfg.deny)
# see man 5 fcron.conf
{ source = pkgs.writeText "fcon.conf" ''
fcrontabs = /var/spool/fcron
pidfile = /var/run/fcron.pid
fifofile = /var/run/fcron.fifo
fcronallow = /etc/fcron.allow
fcrondeny = /etc/fcron.deny
shell = /bin/sh
sendmail = /var/setuid-wrappers/sendmail
editor = /run/current-system/sw/bin/vi
'';
target = "fcron.conf";
mode = "0600"; # max allowed is 644
}
];
environment.systemPackages = [ pkgs.fcron ];
security.setuidPrograms = [ "fcrontab" ];
jobs.fcron =
{ description = "fcron daemon";
startOn = "startup";
after = [ "local-fs.target" ];
environment =
{ PATH = "/run/current-system/sw/bin";
};
preStart =
''
${pkgs.coreutils}/bin/mkdir -m 0700 -p /var/spool/fcron
# load system crontab file
${pkgs.fcron}/bin/fcrontab -u systab ${pkgs.writeText "systab" cfg.systab}
'';
daemonType = "fork";
exec = "${pkgs.fcron}/sbin/fcron -m ${toString cfg.maxSerialJobs} ${queuelen}";
};
};
}