Run pre/post hooks for update-deps

This is a bit of a kludge, but because we are operating outside of
rebar_core when doing update-deps it seems necessary.

src/rebar_core.erl

@@ -28,6 +28,8 @@
 
 -export([process_commands/2, help/2]).
 
+-export([execute_pre/5, execute_post/5]).
+
 -include("rebar.hrl").
 
 %% ===================================================================

src/rebar_deps.erl

@@ -564,8 +564,21 @@ update_source(Config, Dep) ->
     case has_vcs_dir(element(1, Dep#dep.source), AppDir) of
         true ->
             ?CONSOLE("Updating ~p from ~p\n", [Dep#dep.app, Dep#dep.source]),
+            %% Check for and get command specific environments
+            Env = setup_env(Config),
+
+            {true, ModuleSetFile} = rebar_app_utils:is_app_dir(AppDir),
+
+            %% Execute any before_command plugins on this directory
+            Config1 = rebar_core:execute_pre('update-deps', [],
+                                  Config, ModuleSetFile, Env),
             require_source_engine(Dep#dep.source),
             update_source1(AppDir, Dep#dep.source),
+
+            %% Execute any after_command plugins on this directory
+            rebar_core:execute_post('update-deps', [],
+                         Config1, ModuleSetFile, Env),
+
             Dep;
         false ->
             ?WARN("Skipping update for ~p: "