stockholm/krebs/3modules/systemd.nix

52 lines
1.7 KiB
Nix

{ config, options, pkgs, ... }: let {
lib = import ../../lib;
body.options.krebs.systemd.services = lib.mkOption {
default = {};
type = lib.types.attrs;
description = ''
Definition of systemd service units with bonus features.
Services defined using this option will be restarted whenever any file
(described by an absolute path) used in LoadCredential changes.
'';
};
body.config.systemd =
lib.mkMerge
(lib.flatten
(lib.mapAttrsToList (serviceName: cfg: let
prefix = [ "krebs" "systemd" "services" serviceName ];
opts = options.systemd.services.type.getSubOptions prefix;
paths =
lib.filter
lib.types.absolute-pathname.check
(map
(lib.compose [ lib.maybeHead (lib.match "[^:]*:(.*)") ])
(cfg.serviceConfig.LoadCredential or []));
in
lib.singleton {
services.${serviceName} = cfg;
}
++
lib.optionals (cfg.enable or opts.enable.default) (map (path: let
triggerName = "trigger-${lib.systemd.encodeName path}";
in {
paths.${triggerName} = {
wantedBy = ["multi-user.target"];
pathConfig.PathChanged = path;
};
services.${triggerName} = {
serviceConfig = {
Type = "oneshot";
ExecStart = lib.singleton (toString [
"${pkgs.systemd}/bin/systemctl restart"
(lib.shell.escape serviceName)
]);
};
};
}) paths)
) config.krebs.systemd.services));
}