Add possibility to specify rebar config for the "main" application

src/rebar_config.erl

@@ -45,9 +45,19 @@ new() ->
               opts = []}.
 
 new(ParentConfig) ->
+    %% If we are at the top level we might want to load another rebar.config
+    %% We can be certain that we are at the top level if we don't have any
+    %% configs yet since if we are at another level we must have some config.
+    ConfName = case ParentConfig of
+                   {config, _, []} ->
+                       rebar_config:get_global(config, "rebar.config");
+                   _ ->
+                       "rebar.config"
+               end,
+
     %% Load terms from rebar.config, if it exists
     Dir = rebar_utils:get_cwd(),
-    ConfigFile = filename:join([Dir, "rebar.config"]),
+    ConfigFile = filename:join([Dir, ConfName]),
     case file:consult(ConfigFile) of
         {ok, Terms} ->
             %% Found a config file with some terms. We need to be able to

src/rebar_core.erl

@@ -133,6 +133,12 @@ parse_args(Args) ->
                     rebar_config:set_global(jobs, Jobs)
             end,
 
+            %% Set the rebar config to use
+            case proplists:get_value(config, Options) of
+                undefined -> ok;
+                Conf -> rebar_config:set_global(config, Conf)
+            end,
+
             %% Filter all the flags (i.e. strings of form key=value) from the
             %% command line arguments. What's left will be the commands to run.
             filter_flags(NonOptArgs, []);
@@ -250,12 +256,13 @@ option_spec_list() ->
         [Jobs]),
     [
      %% {Name, ShortOpt, LongOpt, ArgSpec, HelpMsg}
-     {help,     $h, "help",     undefined, "Show the program options"},
-     {commands, $c, "commands", undefined, "Show available commands"},
-     {verbose,  $v, "verbose",  undefined, "Be verbose about what gets done"},
-     {version,  $V, "version",  undefined, "Show version information"},
-     {force,    $f, "force",    undefined, "Force"},
-     {jobs,     $j, "jobs",     integer,   JobsHelp}
+     {help,     $h, "help",       undefined, "Show the program options"},
+     {commands, $c, "commands",   undefined, "Show available commands"},
+     {verbose,  $v, "verbose",    undefined, "Be verbose about what gets done"},
+     {version,  $V, "version",    undefined, "Show version information"},
+     {force,    $f, "force",      undefined, "Force"},
+     {jobs,     $j, "jobs",       integer,   JobsHelp},
+     {config,   $C, "config",     string,    "Rebar config file to use"}
     ].
 
 %%