add poke_twice, appup, bump version to 2

.gitignore

@@ -1,3 +1,2 @@
-ebin
 *.beam
 *~

apps/dummy_app/ebin/dummy_app.appup

@@ -0,0 +1,10 @@
+{"2",
+    %% Upgrade instructions from 1 to 2
+    [{"1", [
+        {load_module, dummy_app_server}
+    ]}],
+    %% Downgrade instructions from 2 to 1
+    [{"1",[
+        {load_module, dummy_app_server}
+    ]}]
+}.

apps/dummy_app/src/dummy_app.app.src

@@ -1,7 +1,7 @@
 {application, dummy_app,
  [
   {description, "Dummy project to test release process"},
-  {vsn, "1"},
+  {vsn, "2"},
   {registered, []},
   {applications, [
                   kernel,

apps/dummy_app/src/dummy_app_server.erl

@@ -3,7 +3,7 @@
 -behaviour(gen_server).
 
 %% API
--export([start_link/0, poke/0, num_pokes/0]).
+-export([start_link/0, poke/0, num_pokes/0, poke_twice/0]).
 
 %% gen_server callbacks
 -export([init/1, handle_call/3, handle_cast/2, handle_info/2,
@@ -18,6 +18,9 @@ start_link() ->
 poke() ->
     gen_server:call(?MODULE, poke).
 
+poke_twice() ->
+    gen_server:call(?MODULE, poke_twice).
+
 num_pokes() ->
     gen_server:call(?MODULE, num_pokes).
 
@@ -29,6 +32,12 @@ init([]) ->
 handle_call(num_pokes, _From, State = #state{ num_pokes = PokeCount }) ->
     {reply, PokeCount, State};
 
+handle_call(poke_twice, _From, State) ->
+    NewPokeCount = State#state.num_pokes + 2,
+    NewState     = State#state{num_pokes = NewPokeCount},
+    Reply        = {ok, NewPokeCount},
+    {reply, Reply, NewState};
+
 handle_call(poke, _From, State) ->
     NewPokeCount = State#state.num_pokes + 1,
     NewState     = State#state{num_pokes = NewPokeCount},
@@ -44,7 +53,9 @@ handle_info(_Info, State) ->
 terminate(_Reason, _State) ->
     ok.
 
-code_change(_OldVsn, State, _Extra) ->
+code_change(OldVsn, State, Extra) ->
+    error_logger:info_msg("code_change, oldvsn:~p state:~p extra:~p~n",
+                          [OldVsn, State, Extra]),
     {ok, State}.
 
 %%% Internal functions

rel/reltool.config

@@ -1,6 +1,6 @@
 {sys, [
        {lib_dirs, ["../apps"]},
-       {rel, "dummy", "1",
+       {rel, "dummy", "2",
         [
          kernel,
          stdlib,