nix/module/powerlimit/default.nix

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# Control battery charge limits. Control with `powerlimit` script.
{ pkgs
, lib
, controlFileMax
, controlFileMin
, onMax
, onMin
, offMax
, offMin
, ... }: {
systemd = {
services.powerlimit = {
description = "Limit battery charge.";
enable = true;
wantedBy = [ "multi-user.target" ];
serviceConfig = {
Type = "simple";
RemainAfterExit = "yes";
ExecStart = "${lib.getExe pkgs.bash} -c 'echo ${onMin} > ${controlFileMin}; echo ${onMax} > ${controlFileMax};'";
ExecStop = "${lib.getExe pkgs.bash} -c 'echo ${offMax} > ${controlFileMax}; echo ${offMin} > ${controlFileMin};'";
};
};
# HACK: Allow user access.
tmpfiles.rules = [
"z ${controlFileMax} 0777 - - - -"
"z ${controlFileMin} 0777 - - - -"
];
};
}