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

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{ config, lib, pkgs, utils, ... }:
with lib;
let
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cfg = config.services.freefall;
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in {
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options.services.freefall = {
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enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to protect HP/Dell laptop hard drives (not SSDs) in free fall.
'';
};
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package = mkOption {
type = types.package;
default = pkgs.freefall;
defaultText = "pkgs.freefall";
description = ''
freefall derivation to use.
'';
};
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devices = mkOption {
type = types.listOf types.string;
default = [ "/dev/sda" ];
description = ''
Device paths to all internal spinning hard drives.
'';
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};
};
config = let
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 = [ "${dev'}.device" ];
serviceConfig = {
ExecStart = "${cfg.package}/bin/freefall ${dev}";
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Restart = "on-failure";
Type = "forking";
};
};
in mkIf cfg.enable {
environment.systemPackages = [ cfg.package ];
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systemd.services = builtins.listToAttrs (map mkService cfg.devices);
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};
}