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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