Merge pull request #2735 from chriseth/databaseErrorMessages

More detailed error messages.

libethereum/BlockChain.cpp

@@ -216,7 +216,12 @@ unsigned BlockChain::openDatabase(std::string const& _path, WithExisting _we)
 		}
 		else
 		{
-			cwarn << "Database already open. You appear to have another instance of ethereum running. Bailing.";
+			cwarn <<
+				"Database " <<
+				(chainPath + "/blocks") <<
+				"or " <<
+				(extrasPath + "/extras") <<
+				"already open. You appear to have another instance of ethereum running. Bailing.";
 			BOOST_THROW_EXCEPTION(DatabaseAlreadyOpen());
 		}
 	}

libethereum/State.cpp

@@ -102,7 +102,10 @@ OverlayDB State::openDB(std::string const& _basePath, h256 const& _genesisHash,
 		else
 		{
 			cwarn << status.ToString();
-			cwarn << "Database already open. You appear to have another instance of ethereum running. Bailing.";
+			cwarn <<
+				"Database " <<
+				(path + "/state") <<
+				"already open. You appear to have another instance of ethereum running. Bailing.";
 			BOOST_THROW_EXCEPTION(DatabaseAlreadyOpen());
 		}
 	}