{pkgs, config, lib, ...}: with lib; let cfg = config.services.hologram-agent; cfgFile = pkgs.writeText "hologram-agent.json" (builtins.toJSON { host = cfg.dialAddress; }); in { options = { services.hologram-agent = { enable = mkOption { type = types.bool; default = false; description = "Whether to enable the Hologram agent for AWS instance credentials"; }; dialAddress = mkOption { type = types.str; default = "localhost:3100"; description = "Hologram server and port."; }; httpPort = mkOption { type = types.str; default = "80"; description = "Port for metadata service to listen on."; }; }; }; config = mkIf cfg.enable { boot.kernelModules = [ "dummy" ]; networking.interfaces.dummy0.ipv4.addresses = [ { address = "169.254.169.254"; prefixLength = 32; } ]; systemd.services.hologram-agent = { description = "Provide EC2 instance credentials to machines outside of EC2"; after = [ "network.target" ]; wantedBy = [ "multi-user.target" ]; requires = [ "network-link-dummy0.service" "network-addresses-dummy0.service" ]; preStart = '' /run/current-system/sw/bin/rm -fv /run/hologram.sock ''; serviceConfig = { ExecStart = "${pkgs.hologram}/bin/hologram-agent -debug -conf ${cfgFile} -port ${cfg.httpPort}"; }; }; }; meta.maintainers = with lib.maintainers; [ nand0p ]; }