depot/nixos/modules/config/power-management.nix

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{ config, lib, ... }:
let
cfg = config.powerManagement;
in
{
###### interface
options = {
powerManagement = {
enable = lib.mkOption {
type = lib.types.bool;
default = true;
description = ''
Whether to enable power management. This includes support
for suspend-to-RAM and powersave features on laptops.
'';
};
resumeCommands = lib.mkOption {
type = lib.types.lines;
default = "";
description = "Commands executed after the system resumes from suspend-to-RAM.";
};
powerUpCommands = lib.mkOption {
type = lib.types.lines;
default = "";
example = lib.literalExpression ''
"''${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda"
'';
description = ''
Commands executed when the machine powers up. That is,
they're executed both when the system first boots and when
it resumes from suspend or hibernation.
'';
};
powerDownCommands = lib.mkOption {
type = lib.types.lines;
default = "";
example = lib.literalExpression ''
"''${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda"
'';
description = ''
Commands executed when the machine powers down. That is,
they're executed both when the system shuts down and when
it goes to suspend or hibernation.
'';
};
};
};
###### implementation
config = lib.mkIf cfg.enable {
systemd.targets.post-resume = {
description = "Post-Resume Actions";
requires = [ "post-resume.service" ];
after = [ "post-resume.service" ];
wantedBy = [ "sleep.target" ];
unitConfig.StopWhenUnneeded = true;
};
# Service executed before suspending/hibernating.
systemd.services.pre-sleep =
{ description = "Pre-Sleep Actions";
wantedBy = [ "sleep.target" ];
before = [ "sleep.target" ];
script =
''
${cfg.powerDownCommands}
'';
serviceConfig.Type = "oneshot";
};
systemd.services.post-resume =
{ description = "Post-Resume Actions";
after = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" "suspend-then-hibernate.target" ];
script =
''
/run/current-system/systemd/bin/systemctl try-restart --no-block post-resume.target
${cfg.resumeCommands}
${cfg.powerUpCommands}
'';
serviceConfig.Type = "oneshot";
};
};
}