84 lines
2.3 KiB
Nix
84 lines
2.3 KiB
Nix
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{ config, pkgs, ... }:
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with pkgs.lib;
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let cfg = config.services.apcupsd;
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configFile = pkgs.writeText "apcupsd.conf" ''
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## apcupsd.conf v1.1 ##
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# apcupsd complains if the first line is not like above.
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${cfg.configText}
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'';
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in
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{
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###### interface
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options = {
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services.apcupsd = {
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enable = mkOption {
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default = false;
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type = types.uniq types.bool;
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description = ''
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Whether to enable the APC UPS daemon. apcupsd monitors your UPS and
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permits orderly shutdown of your computer in the event of a power
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failure. User manual: http://www.apcupsd.com/manual/manual.html.
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Note that apcupsd runs as root (to allow shutdown of computer).
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You can check the status of your UPS with the "apcaccess" command.
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'';
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};
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configText = mkOption {
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default = ''
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UPSTYPE usb
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NISIP 127.0.0.1
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BATTERYLEVEL 50
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MINUTES 5
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'';
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type = types.string;
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description = ''
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Contents of the runtime configuration file, apcupsd.conf. The default
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settings makes apcupsd autodetect USB UPSes, limit network access to
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localhost and shutdown the system when the battery level is below 50
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percent, or when the UPS has calculated that it has 5 minutes or less
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of remaining power-on time. See man apcupsd.conf for details.
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'';
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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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# Give users access to the "apcaccess" tool
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environment.systemPackages = [ pkgs.apcupsd ];
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# NOTE 1: apcupsd runs as root because it needs permission to run
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# "shutdown"
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#
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# NOTE 2: When apcupsd calls "wall", it prints an error because stdout is
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# not connected to a tty (it is connected to the journal):
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# wall: cannot get tty name: Inappropriate ioctl for device
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# The message still gets through.
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#
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# TODO: apcupsd calls "mail" on powerfail etc. events, how should we
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# handle that? A configurable mail package or let the event logic be
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# configured from nix expressions?
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systemd.services.apcupsd = {
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description = "UPS daemon";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.apcupsd}/bin/apcupsd -b -f ${configFile} -d1";
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};
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};
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};
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}
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