[reltool] Add test case for reltool_server:get_mod

OTP-9794

This test case revealed a bug that occurs when calling
reltool_server:get_mod after reltool_server:undo_config. get_mod reads
from the module table (ets) and not from the reltool_server state,
while undo_config only changes the state. This bug has been corrected,
so undo_config now updates both state and tables (it does the same as
set_sys).

2 files changed, 45 insertions, 10 deletions

diff --git a/lib/reltool/src/reltool_server.erl b/lib/reltool/src/reltool_server.erl
index fdb9e08a90..7dc2d21158 100644
--- a/lib/reltool/src/reltool_server.erl
+++ b/lib/reltool/src/reltool_server.erl
@@ -266,12 +266,30 @@ loop(#state{common = C, sys = Sys} = S) ->
             reltool_utils:reply(ReplyTo, Ref, Status3),
             ?MODULE:loop(S6);
         {call, ReplyTo, Ref, undo_config} ->
-            S2 = S#state{sys = S#state.old_sys,
-                         old_sys = S#state.sys,
-                         status = S#state.old_status,
-                         old_status = S#state.status},
-            reltool_utils:reply(ReplyTo, Ref, ok),
-            ?MODULE:loop(S2);
+	    OldSys = S#state.old_sys,
+            S2 = S#state{sys = OldSys,
+                         old_sys = Sys},
+	    %%! Possibly skip old_status here, since we do all job again!
+	    %%! If so, consider if it is correct to use Force or not -
+	    %%! since warnings from refresh_app will not re-appear here
+	    %%! in undo if Force==false.
+            Force =
+                (OldSys#sys.root_dir =/= Sys#sys.root_dir) orelse
+                (OldSys#sys.lib_dirs =/= Sys#sys.lib_dirs) orelse
+                (OldSys#sys.escripts =/= Sys#sys.escripts),
+
+            {S3, Status} = refresh(S2, Force, S#state.old_status),
+	    {S4, Status2} = analyse(S3, Status),
+	    S5 =
+		case Status2 of
+		    {ok, _Warnings} -> % BUGBUG: handle warnings
+			S4#state{status = Status2, old_status = S#state.status};
+		    {error, _} ->
+			%% Keep old state
+			S
+		end,
+            reltool_utils:reply(ReplyTo, Ref, Status2),
+            ?MODULE:loop(S5);
         {call, ReplyTo, Ref, {get_rel, RelName}} ->
             Sys = S#state.sys,
             Reply =
diff --git a/lib/reltool/src/reltool_sys_win.erl b/lib/reltool/src/reltool_sys_win.erl
index 8b0f64eb45..f29a95af38 100644
--- a/lib/reltool/src/reltool_sys_win.erl
+++ b/lib/reltool/src/reltool_sys_win.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2009-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2009-2012. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -1290,7 +1290,15 @@ reset_config(#state{status_bar = Bar} = S) ->
 
 undo_config(#state{status_bar = Bar} = S) ->
     wxStatusBar:setStatusText(Bar, "Processing libraries..."),
-    ok = reltool_server:undo_config(S#state.server_pid),
+    case reltool_server:undo_config(S#state.server_pid) of
+	{ok, []} ->
+	    ok;
+	{ok, Warnings} ->
+	    Msg = lists:flatten([[W, $\n] || W <- Warnings]),
+	    display_message(Msg, ?wxICON_WARNING);
+	{error, Reason} ->
+	    display_message(Reason, ?wxICON_ERROR)
+    end,
     refresh(S).
 
 load_config(#state{status_bar = Bar, config_file = OldFile} = S) ->
@@ -1444,8 +1452,17 @@ undo_dialog(S, Warnings) ->
         ?wxID_OK ->
             true;
         ?wxID_CANCEL  ->
-            reltool_server:undo_config(S#state.server_pid),
-            false
+	    case reltool_server:undo_config(S#state.server_pid) of
+		{ok, _} ->
+		    false;
+		{error, Reason} ->
+		    Msg = "FATAL - undo failed:\n\n" ++
+			Reason ++
+			"\n\nTerminating...",
+		    display_message(Msg, ?wxICON_ERROR),
+		    io:format("~p(~p): <ERROR> ~s\n", [?MODULE, ?LINE, Reason]),
+		    exit(Reason)
+	    end
     end.
 
 display_message(Message, Icon) ->