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.
115 lines
2.5 KiB
Nix
115 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.atd;
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inherit (pkgs) at;
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in
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{
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###### interface
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options = {
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services.atd.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable the <command>at</command> daemon, a command scheduler.
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'';
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};
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services.atd.allowEveryone = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to make <filename>/var/spool/at{jobs,spool}</filename>
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writeable by everyone (and sticky). This is normally not
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needed since the <command>at</command> commands are
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setuid/setgid <literal>atd</literal>.
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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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security.setuidOwners = map (program: {
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inherit program;
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owner = "atd";
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group = "atd";
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setuid = true;
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setgid = true;
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}) [ "at" "atq" "atrm" "batch" ];
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environment.systemPackages = [ at ];
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security.pam.services.atd = {};
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users.extraUsers = singleton
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{ name = "atd";
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uid = config.ids.uids.atd;
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description = "atd user";
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home = "/var/empty";
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};
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users.extraGroups = singleton
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{ name = "atd";
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gid = config.ids.gids.atd;
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};
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jobs.atd =
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{ description = "Job Execution Daemon (atd)";
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startOn = "stopped udevtrigger";
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path = [ at ];
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preStart =
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''
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# Snippets taken and adapted from the original `install' rule of
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# the makefile.
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# We assume these values are those actually used in Nixpkgs for
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# `at'.
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spooldir=/var/spool/atspool
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jobdir=/var/spool/atjobs
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etcdir=/etc/at
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for dir in "$spooldir" "$jobdir" "$etcdir"; do
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if [ ! -d "$dir" ]; then
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mkdir -p "$dir"
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chown atd:atd "$dir"
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fi
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done
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chmod 1770 "$spooldir" "$jobdir"
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${if cfg.allowEveryone then ''chmod a+rwxt "$spooldir" "$jobdir" '' else ""}
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if [ ! -f "$etcdir"/at.deny ]; then
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touch "$etcdir"/at.deny
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chown root:atd "$etcdir"/at.deny
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chmod 640 "$etcdir"/at.deny
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fi
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if [ ! -f "$jobdir"/.SEQ ]; then
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touch "$jobdir"/.SEQ
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chown atd:atd "$jobdir"/.SEQ
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chmod 600 "$jobdir"/.SEQ
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fi
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'';
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exec = "atd";
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daemonType = "fork";
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};
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};
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}
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