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https://github.com/ilyakooo0/nixpkgs.git
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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
120 lines
2.5 KiB
Nix
120 lines
2.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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acpiConfDir = pkgs.runCommand "acpi-events" {}
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''
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ensureDir $out
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${
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# Generate a configuration file for each event. (You can't have
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# multiple events in one config file...)
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let f = event:
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''
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fn=$out/${event.name}
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echo "event=${event.event}" > $fn
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echo "action=${pkgs.writeScript "${event.name}.sh" event.action}" >> $fn
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'';
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in pkgs.lib.concatMapStrings f events
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}
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'';
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events = [powerEvent lidEvent acEvent];
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# Called when the power button is pressed.
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powerEvent =
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{ name = "power-button";
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event = "button/power.*";
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action =
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''
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#! ${pkgs.bash}/bin/sh
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${config.services.acpid.powerEventCommands}
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'';
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};
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# Called when the laptop lid is opened/closed.
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lidEvent =
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{ name = "lid";
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event = "button/lid.*";
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action =
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''
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#! ${pkgs.bash}/bin/sh
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${config.services.acpid.lidEventCommands}
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'';
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};
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# Called when the AC power is connected or disconnected.
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acEvent =
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{ name = "ac-power";
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event = "ac_adapter.*";
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action =
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''
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#! ${pkgs.bash}/bin/sh
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${config.services.acpid.acEventCommands}
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'';
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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.acpid = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = "Whether to enable the ACPI daemon.";
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};
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powerEventCommands = mkOption {
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type = types.lines;
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default = "";
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description = "Shell commands to execute on a button/power.* event.";
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};
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lidEventCommands = mkOption {
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type = types.lines;
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default = "";
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description = "Shell commands to execute on a button/lid.* event.";
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};
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acEventCommands = mkOption {
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type = types.lines;
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default = "";
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description = "Shell commands to execute on an ac_adapter.* event.";
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};
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};
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};
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###### implementation
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config = mkIf config.services.acpid.enable {
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jobs.acpid =
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{ description = "ACPI Daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "systemd-udev-settle.service" ];
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path = [ pkgs.acpid ];
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daemonType = "fork";
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exec = "acpid --confdir ${acpiConfDir}";
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unitConfig.ConditionVirtualization = "!systemd-nspawn";
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unitConfig.ConditionPathExists = [ "/proc/acpi" ];
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};
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};
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}
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