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[Rodolfo Alonso <ralonsoh@xxxxxxxxxx>]

Public bug reported:

When privileged.agent.linux.ip_lib.get_link_id() method does not find
the interface, the traceback thrown is misleading: first the index error
is logged and then NetworkInterfaceNotFound traceback. We can reduce
this traceback to the main one avoiding the index error exception.

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 246, in get_link_id
    return ip.link_lookup(ifname=device)[0]
IndexError: list index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/oslo_privsep/daemon.py", line 449, in _process_cmd
    ret = func(*f_args, **f_kwargs)
  File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 53, in sync_inner
    return input_func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/oslo_privsep/priv_context.py", line 247, in _wrap
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 406, in get_link_attributes
    link = _run_iproute_link("get", device, namespace)[0]
  File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 254, in _run_iproute_link
    idx = get_link_id(device, namespace)
  File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 248, in get_link_id
    raise NetworkInterfaceNotFound(device=device, namespace=namespace)
neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network interface tap46dac0f2-cb not found in namespace qdhcp-8c9e6c68-86ef-4bb0-b3fa-9a36a71d0ccb.

** Affects: neutron
     Importance: Undecided
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: New

** Changed in: neutron
     Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)

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https://bugs.launchpad.net/bugs/1849449

Title:
  get_link_id()  traceback in case of non-existing interface is
  misleading

Status in neutron:
  New

Bug description:
  When privileged.agent.linux.ip_lib.get_link_id() method does not find
  the interface, the traceback thrown is misleading: first the index
  error is logged and then NetworkInterfaceNotFound traceback. We can
  reduce this traceback to the main one avoiding the index error
  exception.

  Traceback (most recent call last):
    File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 246, in get_link_id
      return ip.link_lookup(ifname=device)[0]
  IndexError: list index out of range

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/usr/lib/python3.6/site-packages/oslo_privsep/daemon.py", line 449, in _process_cmd
      ret = func(*f_args, **f_kwargs)
    File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 53, in sync_inner
      return input_func(*args, **kwargs)
    File "/usr/lib/python3.6/site-packages/oslo_privsep/priv_context.py", line 247, in _wrap
      return func(*args, **kwargs)
    File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 406, in get_link_attributes
      link = _run_iproute_link("get", device, namespace)[0]
    File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 254, in _run_iproute_link
      idx = get_link_id(device, namespace)
    File "/usr/lib/python3.6/site-packages/neutron/privileged/agent/linux/ip_lib.py", line 248, in get_link_id
      raise NetworkInterfaceNotFound(device=device, namespace=namespace)
  neutron.privileged.agent.linux.ip_lib.NetworkInterfaceNotFound: Network interface tap46dac0f2-cb not found in namespace qdhcp-8c9e6c68-86ef-4bb0-b3fa-9a36a71d0ccb.

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