Code change:
}; }; <ins> listenOptions = { options = { address = mkOption { type = types.str; description = lib.mdDoc '' Address of the interface for `upsd` to listen on. See `man upsd.conf` for details. ''; }; port = mkOption { type = types.port; default = defaultPort; description = lib.mdDoc '' TCP port for `upsd` to listen on. See `man upsd.conf` for details. ''; }; }; }; upsdOptions = { options = { enable = mkOption { type = types.bool; defaultText = literalMD "`true` if `mode` is one of `standalone`, `netserver`"; description = mdDoc "Whether to enable `upsd`."; }; listen = mkOption { type = with types; listOf (submodule listenOptions); default = []; example = [ { address = "192.168.50.1"; } { address = "::1"; port = 5923; } ]; description = lib.mdDoc '' Address of the interface for `upsd` to listen on. See `man upsd` for details`. ''; }; extraConfig = mkOption { type = types.lines; default = ""; description = lib.mdDoc '' Additional lines to add to `upsd.conf`. ''; }; }; config = { enable = mkDefault (elem cfg.mode [ "standalone" "netserver" ]); }; }; monitorOptions = { name, config, ... }: { options = { system = mkOption { type = types.str; default = name; description = lib.mdDoc '' Identifier of the UPS to monitor, in this form: `<upsname>[@<hostname>[:<port>]]` See `upsmon.conf` for details. ''; }; powerValue = mkOption { type = types.int; default = 1; description = lib.mdDoc '' Number of power supplies that the UPS feeds on this system. See `upsmon.conf` for details. ''; }; user = mkOption { type = types.str; description = lib.mdDoc '' Username from `upsd.users` for accessing this UPS. See `upsmon.conf` for details. ''; }; passwordFile = mkOption { type = types.str; defaultText = literalMD "power.ups.users.${user}.passwordFile"; description = lib.mdDoc '' The full path to a file containing the password from `upsd.users` for accessing this UPS. The password file is read on service start. See `upsmon.conf` for details. ''; }; type = mkOption { type = types.str; default = "master"; description = lib.mdDoc '' The relationship with `upsd`. See `upsmon.conf` for details. ''; }; }; config = { passwordFile = mkDefault cfg.users.${config.user}.passwordFile; }; }; upsmonOptions = { options = { enable = mkOption { type = types.bool; defaultText = literalMD "`true` if `mode` is one of `standalone`, `netserver`, `netclient`"; description = mdDoc "Whether to enable `upsmon`."; }; monitor = mkOption { type = with types; attrsOf (submodule monitorOptions); default = {}; description = lib.mdDoc '' Set of UPS to monitor. See `man upsmon.conf` for details. ''; }; settings = mkOption { type = nutFormat.type; default = {}; defaultText = literalMD '' { MINSUPPLIES = 1; RUN_AS_USER = "root"; NOTIFYCMD = "''${pkgs.nut}/bin/upssched"; SHUTDOWNCMD = "''${pkgs.systemd}/bin/shutdown now"; } ''; description = mdDoc "Additional settings to add to `upsmon.conf`."; example = literalMD '' { MINSUPPLIES = 2; NOTIFYFLAG = [ [ "ONLINE" "SYSLOG+EXEC" ] [ "ONBATT" "SYSLOG+EXEC" ] ]; } ''; }; }; config = { enable = mkDefault (elem cfg.mode [ "standalone" "netserver" "netclient" ]); settings = { RUN_AS_USER = "root"; # TODO: replace 'root' by another username. MINSUPPLIES = mkDefault 1; NOTIFYCMD = mkDefault "${pkgs.nut}/bin/upssched"; SHUTDOWNCMD = mkDefault "${pkgs.systemd}/bin/shutdown now"; MONITOR = flip mapAttrsToList cfg.upsmon.monitor (name: monitor: with monitor; [ system powerValue user ""@upsmon_password_${name}@"" type ]); }; }; }; userOptions = { options = { passwordFile = mkOption { type = types.str; description = lib.mdDoc '' The full path to a file that contains the user's (clear text) password. The password file is read on service start. ''; }; actions = mkOption { type = with types; listOf str; default = []; description = lib.mdDoc '' Allow the user to do certain things with upsd. See `man upsd.users` for details. ''; }; instcmds = mkOption { type = with types; listOf str; default = []; description = lib.mdDoc '' Let the user initiate specific instant commands. Use "ALL" to grant all commands automatically. For the full list of what your UPS supports, use "upscmd -l". See `man upsd.users` for details. ''; }; upsmon = mkOption { type = with types; nullOr str; default = null; description = lib.mdDoc '' Add the necessary actions for a upsmon process to work. See `man upsd.users` for details. ''; }; }; }; </ins> in

Related discussion:
text: Describe the bug The following snippet: results in services failing to start due to missing config files etc. : : ( fails too, but that could be down to the fact that I haven't plugged the UPS in yet -- but for the record, it complains ) Expected behavior I'd expect the services to start successfully (and probably complain about the missing actual UPS). Notify maintainers (The UPS module appears to have received only drive-by changes for the last several years, so no idea who to bug personally). Metadata system: host os: multi-user?: sandbox: version: channels(root): nixpkgs: Maintainer information:
OK, should've read the whole module: I'm supposed to supply the missing /etc/nut files myself because it's unwise to keep them in the store (they could contain passwords and whatnot, I guess?). Declaring (in the service definitions) the state directory to be but creating for the purpose appears to be a real bug, though :)
Also (sorry for the semi-off-topic) what are best practices for referencing hand-written config files without their contents winding up in the store? Double-symlinking? If this is documented somewhere, then I haven't found where.
I was struggling with the same problem as until I noticed this bug report. After copying and editing , , and from to (and setting on all those files), I was able to get it to work. I think this should be more discoverable. If it's not appropriate to copy those sample files to on the users behalf, there should at least be detailed instructions on the option to explain what else needs to be done.
I marked this as stale due to inactivity. &rarr;
Agreed this should be more discoverable. Perhaps at least could be defaulted to empty and written, since I seem to be getting away without anything in there. In case it helps anyone, I got it working with something like this:
I was hit this bug today, too. Maybe we can fix it by using a startup unit that handles the secrets and setup the state directories like nextcloud or syncthing do
Been working on today and wanted to put some notes here. Using version 2.7.4. First, isn't used by for PIDs and it will try to write to .