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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.
75 lines
1.6 KiB
Nix
75 lines
1.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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stateDir = "/var/lib/foldingathome";
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cfg = config.services.foldingAtHome;
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fahUser = "foldingathome";
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in {
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###### interface
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options = {
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services.foldingAtHome = {
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enable = mkOption {
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default = false;
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description = ''
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Whether to enable the Folding@Home to use idle CPU time.
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'';
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};
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nickname = mkOption {
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default = "Anonymous";
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description = ''
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A unique handle for statistics.
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'';
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};
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config = mkOption {
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default = "";
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description = ''
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Extra configuration. Contents will be added verbatim to the
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configuration file.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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users.extraUsers = singleton
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{ name = fahUser;
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uid = config.ids.uids.foldingAtHome;
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description = "Folding@Home user";
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home = stateDir;
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};
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jobs.foldingAtHome =
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{ name = "foldingathome";
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startOn = "started network-interfaces";
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stopOn = "stopping network-interfaces";
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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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chown ${fahUser} ${stateDir}
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cp -f ${pkgs.writeText "client.cfg" cfg.config} ${stateDir}/client.cfg
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'';
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exec = "${pkgs.su}/bin/su -s ${pkgs.stdenv.shell} ${fahUser} -c 'cd ${stateDir}; ${pkgs.foldingathome}/bin/fah6'";
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};
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services.foldingAtHome.config = ''
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[settings]
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username=${cfg.nickname}
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'';
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};
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}
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