nixpkgs/nixos/modules/services/hardware/freefall.nix

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{ config, lib, pkgs, utils, ... }:
with lib;
{
###### interface
options = with types; {
services.freefall = {
enable = mkOption {
default = false;
description = ''
Whether to protect HP/Dell laptop hard drives (not SSDs) in free fall.
'';
type = bool;
};
devices = mkOption {
default = [ "/dev/sda" ];
description = ''
Device paths to all internal spinning hard drives.
'';
type = listOf string;
};
};
};
###### implementation
config = let
cfg = config.services.freefall;
mkService = dev:
assert dev != "";
let dev' = utils.escapeSystemdPath dev; in
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nameValuePair "freefall-${dev'}" {
description = "Free-fall protection for ${dev}";
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after = [ "${dev'}.device" ];
wantedBy = [ "${dev'}.device" ];
path = [ pkgs.freefall ];
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unitConfig = {
DefaultDependencies = false;
};
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serviceConfig = {
ExecStart = "${pkgs.freefall}/bin/freefall ${dev}";
Restart = "on-failure";
Type = "forking";
};
};
in mkIf cfg.enable {
environment.systemPackages = [ pkgs.freefall ];
systemd.services = listToAttrs (map mkService cfg.devices);
};
}