main: print exception only in verbose mode

Fixes #230

Signed-off-by: Ruslan Kuprieiev <[email protected]>

dvc/main.py

@@ -5,19 +5,23 @@ main entry point / argument parsing for dvc
 import sys
 from dvc.settings import Settings
 from dvc.logger import Logger
+from dvc.config import ConfigError
 
 def main():
     try:
         settings = Settings(sys.argv[1:])
         instance = settings._parsed_args.func(settings)
     except Exception as e:
-        Logger.error("Exception caught while parsing settings", exc_info=True)
+        # In case we didn't even manage to parse options
+        exc_info = '-v' in sys.argv or '--verbose' in sys.argv
+        Logger.error("Settings error: {}".format(e), exc_info=exc_info)
         return 255
 
     try:
         ret = instance.run()
     except Exception as e:
-        Logger.error("Exception caught in " + instance.__class__.__name__, exc_info=True)
+        exc_info = settings.parsed_args.verbose
+        Logger.error("{} error: {}".format(instance.__class__.__name__, e), exc_info=exc_info)
         return 254
 
     return ret