Makefile

include ../umbrella.mk

package.mk

# yes, this file is empty

sample_plugin.app.src

%% this file goes in src/sample_plugin.app.src
{application, sample_plugin,
 [{description, "Sample Plugin"},
  {vsn, "0.1.0"},
  {modules, []},
  {registered, []},
  {applications, [kernel, stdlib, rabbit]}]}.

sample_plugin.erl

%% this file goes in src/sample_plugin.erl

-module(sample_plugin).

-export([init/1]).

-rabbit_boot_step(
   {?MODULE,
    [{description, "sample plugin"},
     {mfa,         {?MODULE, init,
                    [my_arg]}},
     {requires,    rabbit_registry},
     {enables,     kernel_ready}]}).

init(Arg) ->
    io:format("Arg: ~p priv_dir: ~p~n", [Arg, code:priv_dir(sample_plugin)]).