def copy(self):
        c = HostContext()
        c._command_prefixes = list(self._command_prefixes)
        c._path = list(self._path)
        c._env = list(self._env)
        return c
used in view_ticket() and update_ticket()
dataset/ETHPy150Open jonathanslenders/python-deployer/deployer/host/base.py/HostContext.copy--crossover with--dataset/ETHPy150Open rossp/django-helpdesk/helpdesk/views/staff.py/subscribe_staff_member_to_ticket