From 7eee9d200bf3c244f2f307861cc9fc6d35d9d5a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Valim?= <jose.valim@plataformatec.com.br>
Date: Mon, 18 Nov 2013 11:03:06 +0100
Subject: Properly detect the default release and fail on conflicts

Closes #93
---
 src/rlx_prv_release.erl    | 12 +++++++-----
 test/rlx_release_SUITE.erl | 11 +++++++++--
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/rlx_prv_release.erl b/src/rlx_prv_release.erl
index 134ff7a..0e0a00d 100644
--- a/src/rlx_prv_release.erl
+++ b/src/rlx_prv_release.erl
@@ -88,7 +88,7 @@ create_dep_graph(State) ->
 -spec find_default_release(rlx_state:t(), rlx_depsolver:t()) ->
                                   {ok, rlx_state:t()} | relx:error().
 find_default_release(State, DepGraph) ->
-    case rlx_state:default_configured_release(State) of
+    try rlx_state:default_configured_release(State) of
         {undefined, undefined} ->
             resolve_default_release(State, DepGraph);
         {RelName, undefined} ->
@@ -97,6 +97,9 @@ find_default_release(State, DepGraph) ->
             ?RLX_ERROR({no_release_name, Vsn});
         {RelName, RelVsn} ->
             solve_release(State, DepGraph, RelName, RelVsn)
+    catch
+        {multiple_release_names, _, _}=Error ->
+            ?RLX_ERROR(Error)
     end.
 
 resolve_default_release(State0, DepGraph) ->
@@ -128,14 +131,13 @@ resolve_default_version(State0, DepGraph, RelName) ->
                           boolean().
 release_sort({{RelName, RelVsnA}, _},
              {{RelName, RelVsnB}, _}) ->
-    ec_semver:lte(RelVsnA, RelVsnB);
-release_sort({{RelNameA, RelVsnA}, _}, {{RelNameB, RelVsnB}, _}) ->
+    ec_semver:lte(RelVsnB, RelVsnA);
+release_sort({{RelA, _}, _}, {{RelB, _}, _}) ->
     %% The release names are different. When the releases are named differently
     %% we can not just take the lastest version. You *must* provide a default
     %% release name at least. So we throw an error here that the top can catch
     %% and return
-    erlang:atom_to_list(RelNameA) =< erlang:atom_to_list(RelNameB) andalso
-        ec_semver:lte(RelVsnA, RelVsnB).
+    erlang:throw({multiple_release_names, RelA, RelB}).
 
 solve_release(State0, DepGraph, RelName, RelVsn) ->
     ec_cmd_log:debug(rlx_state:log(State0),
diff --git a/test/rlx_release_SUITE.erl b/test/rlx_release_SUITE.erl
index d16dce9..ae38928 100644
--- a/test/rlx_release_SUITE.erl
+++ b/test/rlx_release_SUITE.erl
@@ -93,12 +93,15 @@ make_release(Config) ->
     write_config(ConfigFile,
                  [{release, {foo, "0.0.1"},
                    [goal_app_1,
-                    goal_app_2]}]),
+                    goal_app_2]},
+                  {release, {foo, "0.0.2"},
+                     [goal_app_1,
+                      goal_app_2]}]),
     OutputDir = filename:join([proplists:get_value(data_dir, Config),
                                create_random_name("relx-output")]),
     {ok, State} = relx:do(undefined, undefined, [], [LibDir1], 3,
                               OutputDir, ConfigFile),
-    [{{foo, "0.0.1"}, Release}] = ec_dictionary:to_list(rlx_state:realized_releases(State)),
+    [{{foo, "0.0.2"}, Release}] = ec_dictionary:to_list(rlx_state:realized_releases(State)),
     AppSpecs = rlx_release:applications(Release),
     ?assert(lists:keymember(stdlib, 1, AppSpecs)),
     ?assert(lists:keymember(kernel, 1, AppSpecs)),
@@ -133,6 +136,10 @@ make_extend_release(Config) ->
                   [goal_app_2]}]),
     OutputDir = filename:join([proplists:get_value(data_dir, Config),
                                create_random_name("relx-output")]),
+
+    ?assertMatch({multiple_release_names,foo_test,foo},
+                 catch relx:do(undefined, undefined, [], [LibDir1], 3, OutputDir, ConfigFile)),
+
     {ok, State} = relx:do(foo_test, undefined, [], [LibDir1], 3,
                               OutputDir, ConfigFile),
     [{{foo_test, "0.0.1"}, Release}] = ec_dictionary:to_list(rlx_state:realized_releases(State)),
-- 
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