Check conditions on the source.

def MeetsConditions(knowledge_base, source):
  """Check conditions on the source."""
  source_conditions_met = True
  os_conditions = ConvertSupportedOSToConditions(source)
  if os_conditions:
    source.conditions.append(os_conditions)
  for condition in source.conditions:
    source_conditions_met &= artifact_utils.CheckCondition(
        condition, knowledge_base)

  return source_conditions_met