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