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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.
39 lines
1 KiB
Nix
39 lines
1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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{
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options = {
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security.rngd.enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable the rng daemon, which adds entropy from
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hardware sources of randomness to the kernel entropy pool when
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available.
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'';
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};
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};
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config = mkIf config.security.rngd.enable {
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services.udev.extraRules = ''
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KERNEL=="random", TAG+="systemd"
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SUBSYSTEM=="cpu", ENV{MODALIAS}=="x86cpu:*feature:*009E*", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
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KERNEL=="hw_random", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
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KERNEL=="tmp0", TAG+="systemd", ENV{SYSTEMD_WANTS}+="rngd.service"
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'';
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systemd.services.rngd = {
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bindsTo = [ "dev-random.device" ];
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after = [ "dev-random.device" ];
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description = "Hardware RNG Entropy Gatherer Daemon";
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serviceConfig.ExecStart = "${pkgs.rng_tools}/sbin/rngd -f";
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restartTriggers = [ pkgs.rng_tools ];
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};
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};
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}
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