Merge pull request #4625 from murgatroid99/ruby_client_stub_fix_typo

Fix a bug recently reported in the mailing list

src/ruby/lib/grpc.rb

-# Copyright 2015, Google Inc.
+# Copyright 2015-2016, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -27,7 +27,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-ssl_roots_path = File.expand_path('../../../etc/roots.pem', __FILE__)
+ssl_roots_path = File.expand_path('../../../../etc/roots.pem', __FILE__)
 unless ENV['GRPC_DEFAULT_SSL_ROOTS_FILE_PATH']
   ENV['GRPC_DEFAULT_SSL_ROOTS_FILE_PATH'] = ssl_roots_path
 end

src/ruby/lib/grpc/generic/client_stub.rb

-# Copyright 2015, Google Inc.
+# Copyright 2015-2016, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -464,7 +464,7 @@ module GRPC
                              method,
                              nil, # host use nil,
                              deadline)
-      call.set_credentials credentials unless credentials.nil?
+      call.set_credentials! credentials unless credentials.nil?
       ActiveCall.new(call, @queue, marshal, unmarshal, deadline, started: false)
     end
   end

src/ruby/pb/test/client.rb

 #!/usr/bin/env ruby
 
-# Copyright 2015, Google Inc.
+# Copyright 2015-2016, Google Inc.
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -264,11 +264,15 @@ class NamedTests
 
   def per_rpc_creds
     auth_creds = Google::Auth.get_application_default(@args.oauth_scope)
+    update_metadata = proc do |md|
       kw = auth_creds.updater_proc.call({})
+    end
+
+    call_creds = GRPC::Core::CallCredentials.new(update_metadata)
 
     resp = perform_large_unary(fill_username: true,
                                fill_oauth_scope: true,
-                               **kw)
+                               credentials: call_creds)
     json_key = File.read(ENV[AUTH_ENV])
     wanted_email = MultiJson.load(json_key)['client_email']
     assert("#{__callee__}: bad username") { wanted_email == resp.username }