removed requirements that no longer apply to all backends

e4s_cl/cf/containers/barebones.py

@@ -91,8 +91,6 @@ def _has_nvidia(self):
 
  def run(self, command: List[str], overload: bool = True) -> int:
  executable = self._executable()
- if executable is None:
- raise BackendNotAvailableError(self.__class__.__name__)
 
  container_cmd = [executable, *self._prepare(command, overload)]
 

e4s_cl/cli/commands/__execute.py

@@ -241,7 +241,6 @@ def _construct_parser(self):
  parser.add_argument('--image',
  type=str,
  dest='image',
- required=True,
  help="Container image to use",
  metavar='image')
 

e4s_cl/cli/commands/launch.py

@@ -297,6 +297,8 @@ def main(self, argv):
  # Ensure the minimum fields required for launch are present
  for _field in ['backend', 'image']:
  if not getattr(parameters, _field, None):
+ if getattr(parameters, 'backend',None) == 'barebones':
+ continue
  self.parser.error(
  f"Missing field: '{_field}'. Specify it using the "
  "appropriate option or by selecting a profile.")