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