File 2854-kernel-Add-erts-to-code-lib_dir-lookup.patch of Package erlang

From 7c94901057d205509e1e15ed702cea9b8a816946 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Fri, 31 Jan 2020 16:49:46 +0100
Subject: [PATCH 04/27] kernel: Add erts to code:lib_dir lookup

---
 erts/test/otp_SUITE.erl                | 10 ++++++++--
 lib/dialyzer/src/dialyzer_cl_parse.erl | 16 ++++++++++------
 lib/kernel/src/code_server.erl         | 33 ++++++++++++++++++++++++---------
 3 files changed, 42 insertions(+), 17 deletions(-)

diff --git a/erts/test/otp_SUITE.erl b/erts/test/otp_SUITE.erl
index c5e0dfe649..b5f15ebb10 100644
--- a/erts/test/otp_SUITE.erl
+++ b/erts/test/otp_SUITE.erl
@@ -57,8 +57,14 @@ init_per_suite(Config) ->
         {error,bad_name} ->
             Erts = filename:join([code:root_dir(),"erts","preloaded","ebin"]),
             {ok,_} = xref:add_directory(Server, Erts, []);
-        _ ->
-            ok
+        LibDir ->
+            case file:read_file_info(filename:join([LibDir,"ebin"])) of
+                {error,enoent} ->
+                    Erts = filename:join([LibDir, "preloaded","ebin"]),
+                    {ok,_} = xref:add_directory(Server, Erts, []);
+                _ ->
+                    ok
+            end
     end,
     [{xref_server,Server}|Config].
 
diff --git a/lib/dialyzer/src/dialyzer_cl_parse.erl b/lib/dialyzer/src/dialyzer_cl_parse.erl
index cadc2116b0..a3ec1b92f1 100644
--- a/lib/dialyzer/src/dialyzer_cl_parse.erl
+++ b/lib/dialyzer/src/dialyzer_cl_parse.erl
@@ -330,12 +330,16 @@ get_lib_dir(Apps) ->
 get_lib_dir([H|T], Acc) ->
   NewElem =
     case code:lib_dir(list_to_atom(H)) of
-      {error, bad_name} ->
-	case H =:= "erts" of % hack for including erts in an un-installed system
-	  true -> filename:join(code:root_dir(), "erts/preloaded/ebin");
-	  false -> H
-	end;
-      LibDir -> LibDir ++ "/ebin"
+      {error, bad_name} -> H;
+      LibDir when H =:= "erts" -> % hack for including erts in an un-installed system
+        EbinDir = filename:join([LibDir,"ebin"]),
+        case file:read_file_info(EbinDir) of
+          {error,enoent} ->
+            filename:join([LibDir,"preloaded","ebin"]);
+          _ ->
+            EbinDir
+        end;
+      LibDir -> filename:join(LibDir,"ebin")
     end,
   get_lib_dir(T, [NewElem|Acc]);
 get_lib_dir([], Acc) ->
diff --git a/lib/kernel/src/code_server.erl b/lib/kernel/src/code_server.erl
index 5469d8694c..8ef54dd0e1 100644
--- a/lib/kernel/src/code_server.erl
+++ b/lib/kernel/src/code_server.erl
@@ -93,7 +93,7 @@ init(Ref, Parent, [Root,Mode]) ->
 		   root = Root,
 		   path = Path,
 		   moddb = Db,
-		   namedb = init_namedb(Path),
+		   namedb = create_namedb(Path, Root),
 		   mode = Mode},
 
     Parent ! {Ref,{ok,self()}},
@@ -265,8 +265,8 @@ handle_call({add_paths,Where,Dirs0}, _From,
     {reply,Resp,S#state{path=Path}};
 
 handle_call({set_path,PathList}, _From,
-	    #state{path=Path0,namedb=Namedb}=S) ->
-    {Resp,Path,NewDb} = set_path(PathList, Path0, Namedb),
+	    #state{root=Root,path=Path0,namedb=Namedb}=S) ->
+    {Resp,Path,NewDb} = set_path(PathList, Path0, Namedb, Root),
     {reply,Resp,S#state{path=Path,namedb=NewDb}};
 
 handle_call({del_path,Name}, _From,
@@ -755,12 +755,12 @@ update(Dir, NameDb) ->
 %%
 %% Set a completely new path.
 %%
-set_path(NewPath0, OldPath, NameDb) ->
+set_path(NewPath0, OldPath, NameDb, Root) ->
     NewPath = normalize(NewPath0),
     case check_path(NewPath) of
 	{ok, NewPath2} ->
 	    ets:delete(NameDb),
-	    NewDb = init_namedb(NewPath2),
+	    NewDb = create_namedb(NewPath2, Root),
 	    {true, NewPath2, NewDb};
 	Error ->
 	    {Error, OldPath, NameDb}
@@ -788,11 +788,27 @@ normalize(Other) ->
 %% Handle a table of name-directory pairs.
 %% The priv_dir/1 and lib_dir/1 functions will have
 %% an O(1) lookup.
-init_namedb(Path) ->
-    Db = ets:new(code_names,[private]),
+create_namedb(Path, Root) ->
+    Db = ets:new(code_names,[named_table, public]),
     init_namedb(lists:reverse(Path), Db),
+
+    case lookup_name("erts", Db) of
+        {ok, _, _, _} ->
+            %% erts is part of code path
+            ok;
+        false ->
+            %% No erts in code path, check if this is a source
+            %% repo and if so use that.
+            ErtsDir = filename:join(Root, "erts"),
+            case erl_prim_loader:read_file_info(ErtsDir) of
+                error ->
+                    ok;
+                _ ->
+                    do_insert_name("erts", ErtsDir, Db)
+            end
+    end,
     Db.
-    
+
 init_namedb([P|Path], Db) ->
     insert_dir(P, Db),
     init_namedb(Path, Db);
@@ -997,7 +1013,6 @@ lookup_name(Name, Db) ->
 	_ -> false
     end.
 
-
 %%
 %% Fetch a directory.
 %%
-- 
2.16.4