109 lines
2.4 KiB
Nix
109 lines
2.4 KiB
Nix
{pkgs, config, ...}:
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with pkgs.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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default = true;
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description = ''
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Whether to enable the `at' daemon, a command scheduler.
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'';
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};
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services.atd.allowEveryone = mkOption {
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default = false;
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description = ''
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Whether to make /var/spool/at{jobs,spool} writeable
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by everyone (and sticky). This is normally not needed since
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the `at' commands are setuid/setgid `atd'.
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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" ];
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environment.systemPackages = [ at ];
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security.pam.services = [ { name = "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 = "at daemon (atd)";
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startOn = "started udev";
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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 "$dir" && chown atd:atd "$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 "$jobdir"/.SEQ
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fi
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'';
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daemonType = "fork";
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exec = "${at}/sbin/atd";
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};
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};
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}
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