Replace inttest external dependency to gpb with a mock

In inttest/proto_gpb, replace the external dependency to gpb, a
protocol buffer compiler, with a simple mock.

The mock provides enough of what is needed for inttest only,
which is to generate some dummy content, but with proper file names.

As a result, the increased timeout for the proto_gpb inttest should no
longer be needed (inttest/proto_gpb/retest.config), both since the
mock is now much faster to compile, and since any network bandwidth or
connectivity issues have now been eliminated.

inttest/proto_gpb/mock/gpb/src/gpb.app.src

@@ -0,0 +1,9 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+
+{application, gpb,
+ [{description, "Simple mock of gpb, with enough to generate dummy files"},
+  {vsn, "1"},
+  {registered, []},
+  {applications, [kernel, stdlib]},
+  {env, []}]}.

inttest/proto_gpb/mock/gpb/src/gpb.erl

@@ -0,0 +1,4 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+
+-module(gpb).

inttest/proto_gpb/mock/gpb/src/gpb_compile.erl

@@ -0,0 +1,73 @@
+%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
+%% ex: ts=4 sw=4 et
+%% -------------------------------------------------------------------
+%%
+%% rebar: Erlang Build Tools
+%%
+%% Copyright (c) 2015 Tomas Abrahamsson (tomas.abrahamsson@gmail.com)
+%%
+%% Permission is hereby granted, free of charge, to any person obtaining a copy
+%% of this software and associated documentation files (the "Software"), to deal
+%% in the Software without restriction, including without limitation the rights
+%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+%% copies of the Software, and to permit persons to whom the Software is
+%% furnished to do so, subject to the following conditions:
+%%
+%% The above copyright notice and this permission notice shall be included in
+%% all copies or substantial portions of the Software.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+%% THE SOFTWARE.
+%% -------------------------------------------------------------------
+-module(gpb_compile).
+-export([file/2]).
+
+%% Simulate gpb compiling some proto files,
+%% but generate only enough of what's needed for testing -- dummy stuff only.
+file(Proto, Opts) ->
+    Prefix = proplists:get_value(module_name_prefix, Opts, ""),
+    Suffix = proplists:get_value(module_name_suffix, Opts, ""),
+    ProtoBase = filename:basename(Proto, ".proto"),
+    ModBase = Prefix ++ ProtoBase ++ Suffix,
+    ErlDest = filename:join(get_erl_outdir(Opts), ModBase ++ ".erl"),
+    HrlDest = filename:join(get_hrl_outdir(Opts), ModBase ++ ".hrl"),
+    ok = file:write_file(ErlDest, erl_text(ModBase)),
+    ok = file:write_file(HrlDest, hrl_text(ModBase)).
+
+erl_text(ModBase) ->
+    io_lib:format(
+      lines(["-module(~p).",
+             "-export([encode_msg/1]).",
+             "-export([decode_msg/2]).",
+             "",
+             "encode_msg(some_dummy_msg) -> <<1,2,3>>.",
+             "",
+             "decode_msg(<<1,2,3>>, _) -> some_dummy_msg."]),
+      [list_to_atom(ModBase)]).
+
+hrl_text(ModBase) ->
+    io_lib:format(
+      lines(["-ifndef(~s_hrl).",
+             "-define(~s_hrl, true).",
+             "",
+             "%% some record definitions would normally go here...",
+             ""
+             "-endif. %% ~s_hrl"]),
+      [ModBase, ModBase, ModBase]).
+
+get_erl_outdir(Opts) ->
+    proplists:get_value(o_erl, Opts, get_outdir(Opts)).
+
+get_hrl_outdir(Opts) ->
+    proplists:get_value(o_hrl, Opts, get_outdir(Opts)).
+
+get_outdir(Opts) ->
+    proplists:get_value(o, Opts, ".").
+
+lines(Lines) ->
+    lists:flatten([[L, $\n] || L <- Lines]).

inttest/proto_gpb/rebar.config

@@ -3,14 +3,12 @@
 
 {erl_opts,
  [
-  {i, "deps/gpb/include"},
   {platform_define, "R13|R14", 'NO_CALLBACK_ATTRIBUTE'}
  ]}.
 
 {deps,
  [
-  {gpb, [], {git, "git://github.com/tomas-abrahamsson/gpb",
-             {branch, "master"}}}
+  {gpb, [], {rsync, "../../../inttest/proto_gpb/mock/gpb"}}
  ]}.
 
 {proto_compiler, gpb}.

inttest/proto_gpb/retest.config

@@ -1,5 +0,0 @@
-%% On my slow old netbook with a 1.6GHz CPU, this inttest
-%% takes about 40 seconds to run, of which network activity
-%% is about 3s. Double that to make avoid unnecessary timeouts
-%% on e.g. loaded shared hosts, or with slow network connections.
-{timeout, 90000}.