Change escript zip archive creation as suggested by Siri Hansen

1. manually insert directory entries to work around issues fixed in
   R15B02 erl_prim_loader
2. put the escript archive's beams in appname/appname/ebin

Tested with R13B03 and R15B01.

rebar.config

@@ -2,7 +2,6 @@
 %% ex: ts=4 sw=4 ft=erlang et
 
 {app_bin, ["priv/rebar"]}.
-{escript_emu_args, "%%! -noshell -noinput\n"}.
 %% escript_incl_extra is for internal rebar-private use only.
 %% Do not use outside rebar. Config interface is not stable.
 {escript_incl_extra, [{"priv/templates/*", "."}]}.

src/rebar_escripter.erl

@@ -40,6 +40,7 @@ escriptize(Config0, AppFile) ->
     %% Extract the application name from the archive -- this is the default
     %% name of the generated script
     {Config, AppName} = rebar_app_utils:app_name(Config0, AppFile),
+    AppNameStr = atom_to_list(AppName),
 
     %% Get the output filename for the escript -- this may include dirs
     Filename = rebar_config:get_local(Config, escript_name, AppName),
@@ -57,7 +58,10 @@ escriptize(Config0, AppFile) ->
 
     %% Construct the archive of everything in ebin/ dir -- put it on the
     %% top-level of the zip file so that code loading works properly.
-    Files = load_files("*", "ebin") ++ InclBeams ++ InclExtra,
+    EbinPrefix = filename:join(AppNameStr, "ebin"),
+    EbinFiles = usort(load_files(EbinPrefix, "*", "ebin")),
+    ExtraFiles = usort(InclBeams ++ InclExtra),
+    Files = EbinFiles ++ ExtraFiles,
 
     case zip:create("mem", Files, [memory]) of
         {ok, {"mem", ZipBin}} ->
@@ -66,7 +70,10 @@ escriptize(Config0, AppFile) ->
             Shebang = rebar_config:get(Config, escript_shebang,
                                        "#!/usr/bin/env escript\n"),
             Comment = rebar_config:get(Config, escript_comment, "%%\n"),
-            EmuArgs = rebar_config:get(Config, escript_emu_args, "%%!\n"),
+            DefaultEmuArgs = ?FMT("%%! -pa ~s/~s/ebin -noshell -noinput\n",
+                                  [AppNameStr, AppNameStr]),
+            EmuArgs = rebar_config:get(Config, escript_emu_args,
+                                       DefaultEmuArgs),
             Script = iolist_to_binary([Shebang, Comment, EmuArgs, ZipBin]),
             case file:write_file(Filename, Script) of
                 ok ->
@@ -109,9 +116,8 @@ get_app_beams([App | Rest], Acc) ->
             ?ABORT("Failed to get ebin/ directory for "
                    "~p escript_incl_apps.", [App]);
         Path ->
-            Acc2 = [{filename:join([App, ebin, F]),
-                     file_contents(filename:join(Path, F))} ||
-                       F <- filelib:wildcard("*", Path)],
+            Prefix = filename:join(atom_to_list(App), "ebin"),
+            Acc2 = load_files(Prefix, "*", Path),
             get_app_beams(Rest, Acc2 ++ Acc)
     end.
 
@@ -122,11 +128,42 @@ get_extra(Config) ->
                 end, [], Extra).
 
 load_files(Wildcard, Dir) ->
-    [read_file(Filename, Dir) || Filename <- filelib:wildcard(Wildcard, Dir)].
+    load_files("", Wildcard, Dir).
 
-read_file(Filename, Dir) ->
-    {Filename, file_contents(filename:join(Dir, Filename))}.
+load_files(Prefix, Wildcard, Dir) ->
+    [read_file(Prefix, Filename, Dir)
+     || Filename <- filelib:wildcard(Wildcard, Dir)].
+
+read_file(Prefix, Filename, Dir) ->
+    Filename1 = case Prefix of
+                    "" ->
+                        Filename;
+                    _ ->
+                        filename:join([Prefix, Filename])
+                end,
+    [dir_entries(filename:dirname(Filename1)),
+     {Filename1, file_contents(filename:join(Dir, Filename))}].
 
 file_contents(Filename) ->
     {ok, Bin} = file:read_file(Filename),
     Bin.
+
+%% given a filename return zip archive dir entries for each sub-dir
+dir_entries(File) ->
+    Dirs = dirs(File),
+    [{Dir ++ "/", <<>>} || Dir <- Dirs].
+
+%% given "foo/bar/baz" return ["foo", "foo/bar", "foo/bar/baz"]
+dirs(Dir) ->
+    dirs1(filename:split(Dir), "", []).
+
+dirs1([], _, Acc) ->
+    lists:reverse(Acc);
+dirs1([H|T], "", []) ->
+    dirs1(T, H, [H]);
+dirs1([H|T], Last, Acc) ->
+    Dir = filename:join(Last, H),
+    dirs1(T, Dir, [Dir|Acc]).
+
+usort(List) ->
+    lists:ukeysort(1, lists:flatten(List)).