Cannot delete machines from unreachable networks

[SchoolGuy]

Reproducer

1. Delete a machine in the Admin UI when it is not reachable
2. Press "Delete"
3. See error

Log

Mär 26 11:52:26 orthos2 uwsgi[8444]: Internal Server Error: /admin/data/machine/
Mär 26 11:52:26 orthos2 uwsgi[8444]: Traceback (most recent call last):
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/ssh.py", line 108, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     self._client.connect(**configuration)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 343, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     retry_on_signal(lambda: sock.connect(addr))
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/paramiko/util.py", line 280, in retry_on_signal
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return function()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 343, in <lambda>
Mär 26 11:52:26 orthos2 uwsgi[8444]:     retry_on_signal(lambda: sock.connect(addr))
Mär 26 11:52:26 orthos2 uwsgi[8444]: OSError: [Errno 101] Network is unreachable
Mär 26 11:52:26 orthos2 uwsgi[8444]: During handling of the above exception, another exception occurred:
Mär 26 11:52:26 orthos2 uwsgi[8444]: Traceback (most recent call last):
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/core/handlers/exception.py", line 47, in inner
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = get_response(request)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/core/handlers/base.py", line 181, in _get_response
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = wrapped_callback(request, *callback_args, **callback_kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 616, in wrapper
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return self.admin_site.admin_view(view)(*args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = view_func(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = view_func(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 232, in inner
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return view(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/utils/decorators.py", line 43, in _wrapper
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return bound_method(*args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = view_func(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1739, in changelist_view
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = self.response_action(request, queryset=cl.get_queryset(request))
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1408, in response_action
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = func(self, request, queryset)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/actions.py", line 45, in delete_selected
Mär 26 11:52:26 orthos2 uwsgi[8444]:     modeladmin.delete_queryset(request, queryset)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1109, in delete_queryset
Mär 26 11:52:26 orthos2 uwsgi[8444]:     queryset.delete()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/db/models/query.py", line 746, in delete
Mär 26 11:52:26 orthos2 uwsgi[8444]:     deleted, _rows_count = collector.delete()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/db/models/deletion.py", line 405, in delete
Mär 26 11:52:26 orthos2 uwsgi[8444]:     sender=model, instance=obj, using=self.using
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/dispatch/dispatcher.py", line 182, in send
Mär 26 11:52:26 orthos2 uwsgi[8444]:     for receiver in self._live_receivers(sender)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/dispatch/dispatcher.py", line 182, in <listcomp>
Mär 26 11:52:26 orthos2 uwsgi[8444]:     for receiver in self._live_receivers(sender)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/data/signals.py", line 105, in machine_pre_delete
Mär 26 11:52:26 orthos2 uwsgi[8444]:     server.remove(instance)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/cobbler.py", line 248, in remove
Mär 26 11:52:26 orthos2 uwsgi[8444]:     self.connect()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/cobbler.py", line 184, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     self._conn.connect()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/ssh.py", line 112, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     raise SSH.Exception("Socket error: {}".format(e))
Mär 26 11:52:26 orthos2 uwsgi[8444]: orthos2.utils.ssh.SSH.Exception: Socket error: [Errno 101] Network is unreachable
Mär 26 11:52:26 orthos2 uwsgi[8444]: EE:django.request:Internal Server Error: /admin/data/machine/
Mär 26 11:52:26 orthos2 uwsgi[8444]: Traceback (most recent call last):
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/ssh.py", line 108, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     self._client.connect(**configuration)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 343, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     retry_on_signal(lambda: sock.connect(addr))
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/paramiko/util.py", line 280, in retry_on_signal
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return function()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/paramiko/client.py", line 343, in <lambda>
Mär 26 11:52:26 orthos2 uwsgi[8444]:     retry_on_signal(lambda: sock.connect(addr))
Mär 26 11:52:26 orthos2 uwsgi[8444]: OSError: [Errno 101] Network is unreachable
Mär 26 11:52:26 orthos2 uwsgi[8444]: During handling of the above exception, another exception occurred:
Mär 26 11:52:26 orthos2 uwsgi[8444]: Traceback (most recent call last):
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/core/handlers/exception.py", line 47, in inner
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = get_response(request)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/core/handlers/base.py", line 181, in _get_response
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = wrapped_callback(request, *callback_args, **callback_kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 616, in wrapper
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return self.admin_site.admin_view(view)(*args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = view_func(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = view_func(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 232, in inner
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return view(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/utils/decorators.py", line 43, in _wrapper
Mär 26 11:52:26 orthos2 uwsgi[8444]:     return bound_method(*args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = view_func(request, *args, **kwargs)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1739, in changelist_view
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = self.response_action(request, queryset=cl.get_queryset(request))
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1408, in response_action
Mär 26 11:52:26 orthos2 uwsgi[8444]:     response = func(self, request, queryset)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/actions.py", line 45, in delete_selected
Mär 26 11:52:26 orthos2 uwsgi[8444]:     modeladmin.delete_queryset(request, queryset)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/contrib/admin/options.py", line 1109, in delete_queryset
Mär 26 11:52:26 orthos2 uwsgi[8444]:     queryset.delete()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/db/models/query.py", line 746, in delete
Mär 26 11:52:26 orthos2 uwsgi[8444]:     deleted, _rows_count = collector.delete()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/db/models/deletion.py", line 405, in delete
Mär 26 11:52:26 orthos2 uwsgi[8444]:     sender=model, instance=obj, using=self.using
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/dispatch/dispatcher.py", line 182, in send
Mär 26 11:52:26 orthos2 uwsgi[8444]:     for receiver in self._live_receivers(sender)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "/usr/lib/python3.6/site-packages/django/dispatch/dispatcher.py", line 182, in <listcomp>
Mär 26 11:52:26 orthos2 uwsgi[8444]:     for receiver in self._live_receivers(sender)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/data/signals.py", line 105, in machine_pre_delete
Mär 26 11:52:26 orthos2 uwsgi[8444]:     server.remove(instance)
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/cobbler.py", line 248, in remove
Mär 26 11:52:26 orthos2 uwsgi[8444]:     self.connect()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/cobbler.py", line 184, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     self._conn.connect()
Mär 26 11:52:26 orthos2 uwsgi[8444]:   File "./orthos2/utils/ssh.py", line 112, in connect
Mär 26 11:52:26 orthos2 uwsgi[8444]:     raise SSH.Exception("Socket error: {}".format(e))
Mär 26 11:52:26 orthos2 uwsgi[8444]: orthos2.utils.ssh.SSH.Exception: Socket error: [Errno 101] Network is unreachable

[SchoolGuy]

It appears that the issue here is that it tries to reach Cobbler and fails to do so. I think we need to introduce a flag that allows for force deletion without connection to Cobbler.