nixos/pixiecore: init (#83406)

Co-authored-by: raunovv <rauno@oyenetwork.com>
Co-authored-by: Jörg Thalheim <joerg@thalheim.io>

nixos/modules/module-list.nix

@@ -683,6 +683,7 @@
   ./services/networking/ostinato.nix
   ./services/networking/owamp.nix
   ./services/networking/pdnsd.nix
+  ./services/networking/pixiecore.nix
   ./services/networking/polipo.nix
   ./services/networking/powerdns.nix
   ./services/networking/pdns-recursor.nix

nixos/modules/services/networking/pixiecore.nix

@@ -0,0 +1,134 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.pixiecore;
+in
+{
+  meta.maintainers = with maintainers; [ bbigras danderson ];
+
+  options = {
+    services.pixiecore = {
+      enable = mkEnableOption "Pixiecore";
+
+      openFirewall = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Open ports (67, 69 UDP and 4011, 'port', 'statusPort' TCP) in the firewall for Pixiecore.
+        '';
+      };
+
+      mode = mkOption {
+        description = "Which mode to use";
+        default = "boot";
+        type = types.enum [ "api" "boot" ];
+      };
+
+      debug = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Log more things that aren't directly related to booting a recognized client";
+      };
+
+      dhcpNoBind = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Handle DHCP traffic without binding to the DHCP server port";
+      };
+
+      kernel = mkOption {
+        type = types.str or types.path;
+        default = "";
+        description = "Kernel path. Ignored unless mode is set to 'boot'";
+      };
+
+      initrd = mkOption {
+        type = types.str or types.path;
+        default = "";
+        description = "Initrd path. Ignored unless mode is set to 'boot'";
+      };
+
+      cmdLine = mkOption {
+        type = types.str;
+        default = "";
+        description = "Kernel commandline arguments. Ignored unless mode is set to 'boot'";
+      };
+
+      listen = mkOption {
+        type = types.str;
+        default = "0.0.0.0";
+        description = "IPv4 address to listen on";
+      };
+
+      port = mkOption {
+        type = types.port;
+        default = 80;
+        description = "Port to listen on for HTTP";
+      };
+
+      statusPort = mkOption {
+        type = types.port;
+        default = 80;
+        description = "HTTP port for status information (can be the same as --port)";
+      };
+
+      apiServer = mkOption {
+        type = types.str;
+        example = "localhost:8080";
+        description = "host:port to connect to the API. Ignored unless mode is set to 'api'";
+      };
+
+      extraArguments = mkOption {
+        type = types.listOf types.str;
+        default = [];
+        description = "Additional command line arguments to pass to Pixiecore";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.groups.pixiecore = {};
+    users.users.pixiecore = {
+      description = "Pixiecore daemon user";
+      group = "pixiecore";
+    };
+
+    networking.firewall = mkIf cfg.openFirewall {
+      allowedTCPPorts = [ 4011 cfg.port cfg.statusPort ];
+      allowedUDPPorts = [ 67 69 ];
+    };
+
+    systemd.services.pixiecore = {
+      description = "Pixiecore server";
+      after = [ "network.target"];
+      wants = [ "network.target"];
+      wantedBy = [ "multi-user.target"];
+      serviceConfig = {
+        User = "pixiecore";
+        Restart = "always";
+        AmbientCapabilities = [ "cap_net_bind_service" ] ++ optional cfg.dhcpNoBind "cap_net_raw";
+        ExecStart =
+          let
+            argString =
+              if cfg.mode == "boot"
+              then [ "boot" cfg.kernel ]
+                   ++ optional (cfg.initrd != "") cfg.initrd
+                   ++ optional (cfg.cmdLine != "") "--cmdline=${lib.escapeShellArg cfg.cmdLine}"
+              else [ "api" cfg.apiServer ];
+          in
+            ''
+              ${pkgs.pixiecore}/bin/pixiecore \
+                ${lib.escapeShellArgs argString} \
+                ${optionalString cfg.debug "--debug"} \
+                ${optionalString cfg.dhcpNoBind "--dhcp-no-bind"} \
+                --listen-addr ${lib.escapeShellArg cfg.listen} \
+                --port ${toString cfg.port} \
+                --status-port ${toString cfg.statusPort} \
+                ${escapeShellArgs cfg.extraArguments}
+              '';
+      };
+    };
+  };
+}