92 lines
2.1 KiB
Nix
92 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.krebs.power-action;
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out = {
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options.krebs.power-action = api;
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config = lib.mkIf cfg.enable imp;
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};
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api = {
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enable = mkEnableOption "power-action";
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battery = mkOption {
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type = types.str;
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default = "BAT0";
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};
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user = mkOption {
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type = types.str;
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default = "power-action";
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};
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startAt = mkOption {
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type = types.str;
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default = "*:0/1";
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};
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plans = mkOption {
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type = with types; attrsOf (submodule {
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options = {
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charging = mkOption {
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type = nullOr bool;
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default = null;
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description = ''
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check for charging status.
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null = don't care
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true = only if system is charging or unknown
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false = only if system is discharging
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'';
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};
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upperLimit = mkOption {
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type = int;
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};
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lowerLimit = mkOption {
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type = int;
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};
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action = mkOption {
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type = path;
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};
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};
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});
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};
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};
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imp = {
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systemd.services.power-action = {
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serviceConfig = rec {
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ExecStart = startScript;
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User = cfg.user;
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};
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startAt = cfg.startAt;
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};
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};
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startScript = pkgs.writeDash "power-action" ''
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set -euf
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power="$(${powerlvl})"
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state="$(${state})"
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${concatStringsSep "\n" (mapAttrsToList writeRule cfg.plans)}
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'';
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charging_check = plan:
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if (plan.charging == null) then "" else
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if plan.charging
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then ''&& [ "$state" = "true" ]''
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else ''&& ! [ "$state" = "true" ]''
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;
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writeRule = _: plan:
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"if [ $power -ge ${toString plan.lowerLimit} ] && [ $power -le ${toString plan.upperLimit} ] ${charging_check plan}; then ${plan.action}; fi";
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powerlvl = pkgs.writeDash "powerlvl" ''
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cat /sys/class/power_supply/${cfg.battery}/capacity
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'';
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state = pkgs.writeDash "state" ''
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if [ "$(cat /sys/class/power_supply/${cfg.battery}/status)" = "Discharging" ]
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then echo "false"
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else echo "true"
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fi
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'';
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in out
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