Move all of NixOS to nixos/ in preparation of the repository merge

nixos/modules/services/amqp/rabbitmq.nix

@@ -0,0 +1,94 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  cfg = config.services.rabbitmq;
+
+  run = cmd: "${pkgs.sudo}/bin/sudo -E -u rabbitmq ${cmd}";
+
+in
+
+{
+
+
+  ###### interface
+
+  options = {
+
+    services.rabbitmq = {
+
+      enable = mkOption {
+        default = false;
+        description = ''
+          Whether to enable the RabbitMQ server, an Advanced Message
+          Queuing Protocol (AMQP) broker.
+        '';
+      };
+
+      listenAddress = mkOption {
+        default = "127.0.0.1";
+        example = "";
+        description = ''
+          IP address on which RabbitMQ will listen for AMQP
+          connections.  Set to the empty string to listen on all
+          interfaces.  Note that RabbitMQ creates a user named
+          <literal>guest</literal> with password
+          <literal>guest</literal> by default, so you should delete
+          this user if you intend to allow external access.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ pkgs.rabbitmq_server ];
+
+    users.extraUsers.rabbitmq = {
+      description = "RabbitMQ server user";
+      home = "/var/empty";
+      group = "rabbitmq";
+      uid = config.ids.uids.rabbitmq;
+    };
+
+    users.extraGroups.rabbitmq.gid = config.ids.gids.rabbitmq;
+
+    jobs.rabbitmq = {
+        description = "RabbitMQ server";
+
+        startOn = "started network-interfaces";
+
+        preStart =
+          ''
+            mkdir -m 0700 -p /var/lib/rabbitmq
+            chown rabbitmq /var/lib/rabbitmq
+
+            mkdir -m 0700 -p /var/log/rabbitmq
+            chown rabbitmq /var/log/rabbitmq
+          '';
+
+        environment.HOME = "/var/lib/rabbitmq";
+        environment.RABBITMQ_NODE_IP_ADDRESS = cfg.listenAddress;
+        environment.SYS_PREFIX = "";
+
+        exec =
+          ''
+            ${run "${pkgs.rabbitmq_server}/sbin/rabbitmq-server"}
+          '';
+
+        preStop =
+          ''
+            ${run "${pkgs.rabbitmq_server}/sbin/rabbitmqctl stop"}
+          '';
+      };
+
+  };
+
+}