fix leaking ets tables caused by digraphs

src/rebar_digraph.erl

@@ -16,20 +16,23 @@ compile_order(Apps) ->
                           Deps = all_apps_deps(App),
                           add(Graph, {Name, Deps})
                   end, Apps),
-    case digraph_utils:topsort(Graph) of
-        false ->
-            case digraph_utils:is_acyclic(Graph) of
-                true ->
-                    {error, no_sort};
-                false ->
-                    Cycles = lists:sort(
-                        [lists:sort(Comp) || Comp <- digraph_utils:strong_components(Graph),
-                                             length(Comp)>1]),
-                    {error, {cycles, Cycles}}
-            end;
-        V ->
-            {ok, names_to_apps(lists:reverse(V), Apps)}
-    end.
+    Order =
+        case digraph_utils:topsort(Graph) of
+            false ->
+                case digraph_utils:is_acyclic(Graph) of
+                    true ->
+                        {error, no_sort};
+                    false ->
+                        Cycles = lists:sort(
+                                   [lists:sort(Comp) || Comp <- digraph_utils:strong_components(Graph),
+                                                        length(Comp)>1]),
+                        {error, {cycles, Cycles}}
+                end;
+            V ->
+                {ok, names_to_apps(lists:reverse(V), Apps)}
+        end,
+    true = digraph:delete(Graph),
+    Order.
 
 add(Graph, {PkgName, Deps}) ->
     case digraph:vertex(Graph, PkgName) of

src/rebar_erlc_compiler.erl

@@ -165,7 +165,8 @@ doterl_compile(Config, Dir, OutDir, MoreSources, ErlOpts) ->
     {DepErls, OtherErls} = lists:partition(
                              fun(Source) -> digraph:in_degree(G, Source) > 0 end,
                              [File || File <- NeededErlFiles, not lists:member(File, ErlFirstFiles)]),
-    DepErlsOrdered = digraph_utils:topsort(digraph_utils:subgraph(G, DepErls)),
+    SubGraph = digraph_utils:subgraph(G, DepErls),
+    DepErlsOrdered = digraph_utils:topsort(SubGraph),
     FirstErls = ErlFirstFiles ++ lists:reverse(DepErlsOrdered),
     ?DEBUG("Files to compile first: ~p", [FirstErls]),
     rebar_base_compiler:run(
@@ -177,6 +178,8 @@ doterl_compile(Config, Dir, OutDir, MoreSources, ErlOpts) ->
                          end,
               internal_erl_compile(C, Dir, S, OutDir1, ErlOpts1)
       end),
+    true = digraph:delete(SubGraph),
+    true = digraph:delete(G),
     ok.
 
 %% Get files which need to be compiled first, i.e. those specified in erl_first_files

src/rebar_prv_update.erl

@@ -59,6 +59,7 @@ do(State) ->
         ok = file:write_file(HexFile, Unzipped),
         {Dict, Graph} = hex_to_graph(HexFile),
         write_registry(Dict, Graph, State),
+        true = digraph:delete(Graph),
         ok
     catch
         _E:C ->