Fix reltool config handling during execution hooks

Makefile

@@ -0,0 +1,20 @@
+#!/usr/bin/make -f
+# Makefile wrapper
+
+all: clean-build
+
+build:
+	@(./rebar compile)
+
+clean:
+	@(./rebar clean)
+
+clean-build: clean build
+
+test: test-deps
+	@(./rebar -C test.config retest -v)
+
+test-deps:
+	@(./rebar -C test.config get-deps compile-deps)
+
+.PHONY: all build clean clean-build test

README.md

@@ -24,7 +24,7 @@ Then you will be able to fetch and install the plugin (locally) with rebar:
     user@host$ rebar get-deps compile
     user@host$ rebar dist skip_deps=true
 
-Alternatively, you may put the plugin into your `ERL_LIBS` path somewhere and 
+Alternatively, you may put the plugin into your `ERL_LIBS` path somewhere and
 use it in many projects. This can be done manually, or using a package manager:
 
     user@host$ epm install hyperthunk/rebar-dist-plugin  # or
@@ -46,3 +46,10 @@ You execute the plugin like any other rebar command:
 
     rebar clean generate    # if you're hooked into a release
     rebar distclean dist    # if you wish to explicitly assemble a distribution
+
+## Running the tests
+
+The project ships with a `Makefile` wrapper that will execute a bunch of tests
+against the examples directory using the [rebar_retest_plugin](https://github.com/hyperthunk/rebar_retest_plugin). As this
+configuration has separate dependencies (for test only), the simplest way to run
+these is to execute `make test` on the command line.

rebar.config

@@ -1,15 +1,2 @@
 
-{deps, [
-    {rebar_retest_plugin, ".*"} 
-]}.
-
-{erl_opts, [{outdir, "ebin"}, 
-            debug_info, 
-            warnings_as_errors]}.
-
-%% ReTest config
-{rebar_plugins, [rebar_retest_plugin]}.
-{retest_testdir, "inttest"}.
-{retest_verbose, true}.
-{retest_loglevel, debug}.
-
+{erl_opts, [warnings_as_errors]}.

src/rebar_dist_plugin.erl

@@ -304,7 +304,8 @@ release_vsn(Dir) ->
     File = filename:join(Dir, "reltool.config"),
     case filelib:is_regular(File) of
         true ->
-            rebar_rel_utils:get_reltool_release_info(File);
+            {ok, Config} = file:consult(File),
+            rebar_rel_utils:get_reltool_release_info(Config);
         _ ->
             ""
     end.

test.config

@@ -0,0 +1,17 @@
+
+{deps, [
+    {retest, ".*",
+        {git, "https://github.com/hyperthunk/retest.git", "master"}},
+    {rebar_retest_plugin, ".*",
+        {git, "https://github.com/hyperthunk/rebar_retest_plugin.git", "master"}}
+]}.
+
+{erl_opts, [{outdir, "ebin"}, 
+            debug_info, 
+            warnings_as_errors]}.
+
+%% ReTest config
+{rebar_plugins, [rebar_retest_plugin]}.
+{retest_testdir, "inttest"}.
+{retest_verbose, true}.
+{retest_loglevel, debug}.