set REBAR_DEPS_DIR in hooks env and run pre_compile hooks before deps compile

src/rebar_hooks.erl

@@ -4,10 +4,11 @@
 
 run_compile_hooks(Dir, Type, Command, State) ->
     Hooks = rebar_state:get(State, Type, []),
+    Env = [{"REBAR_DEPS_DIR", rebar_prv_install_deps:get_deps_dir(State)}],
     lists:foreach(fun({_, C, _}=Hook) when C =:= Command ->
-                          apply_hook(Dir, [], Hook);
+                          apply_hook(Dir, Env, Hook);
                      ({C, _}=Hook) when C =:= Command ->
-                          apply_hook(Dir, [], Hook);
+                          apply_hook(Dir, Env, Hook);
                      (_) ->
                           continue
                   end, Hooks).

src/rebar_prv_compile.erl

@@ -43,6 +43,8 @@ do(State) ->
 
     ProjectApps = rebar_state:project_apps(State1),
     Deps = rebar_state:get(State1, deps_to_build, []),
+    Cwd = rebar_utils:get_cwd(),
+    rebar_hooks:run_compile_hooks(Cwd, pre_hooks, compile, State1),
 
     %% Need to allow global config vars used on deps
     %% Right now no way to differeniate and just give deps a new state
@@ -51,8 +53,6 @@ do(State) ->
     build_apps(EmptyState1, Deps),
 
     %% Use the project State for building project apps
-    Cwd = rebar_utils:get_cwd(),
-    rebar_hooks:run_compile_hooks(Cwd, pre_hooks, compile, State1),
     %% Set hooks to empty so top-level hooks aren't run for each project app
     State2 = rebar_state:set(rebar_state:set(State1, post_hooks, []), pre_hooks, []),
     build_apps(State2, ProjectApps),