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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