When a network interface is disconnected from the system (e.g.,
physically removed if it's a USB adapter), probert asynchronously calls
the del_link() method.
Upon receiving this notification, Subiquity server wants to send an
update to the Subiquity clients. The update contains information about
the interface that disappeared - which is obtained through a call to
netdev_info.
Unfortunately, for Wi-Fi and Ethernet interfaces, netdev_info
dereferences the NetworkDev.info variable. Interfaces that no longer
exist on the system (and also interfaces that do not yet exist), have
their "info" variable set to None - so an exception is raised when
dereferencing it.
Wi-Fi interface:
File "subiquitycore/models/network.py", line 227, in netdev_info
scan_state=self.info.wlan['scan_state'],
AttributeError: 'NoneType' object has no attribute 'wlan'
Ethernet interface:
File "subiquitycore/models/network.py", line 201, in netdev_info
is_connected = bool(self.info.is_connected)
AttributeError: 'NoneType' object has no attribute 'is_connected'
Fixed by making sure netdev_info does not raise if the dev.info variable
is None. This is a valid use-case.
Signed-off-by: Olivier Gayot <olivier.gayot@canonical.com>
The network view code used to crawl all over the network model object,
which isn't really going to work with the upcoming client/server split.
So this adds a much better defined interface between the view and
controller.
Add CAN and unknown interfaces to NETDEV_IGNORED_IFACE_TYPES, otherwise rander_config() will throw a KeyError exception when a unsupported interface shows up.
in particular: have subiquitycore.netplan understand them. The goal of
all this is to make the recent change to not delete virtual interfaces
if their configuration has not changed actually work.
Mark all devices with DHCP enabled as pending when the config is
applied, and mark them as timed out ten seconds later if they have not
received any addresses.
The visible impact of this is that the addresses for a NIC are now
displayed underneath its name and a long "info line" (i.e. mac / model /
vendor) for a nic no longer distorts its table.
This lays the groundwork for better handling of NICs that fail to dhcp
and things like that.
The main thrust of this is to not create virtual interfaces until
applying the config.
This meant that the network model has to change a bit to be able to
represent interfaces that do not yet exist on the system. I did this
by ripping out most of the existing network device code: now a
NetworkDev is really just a wrapper for the config for a device and (if
it exists) the netlink data too. A few places had to adjust to checking
if the netlink info is available before accessing it but all in all it
was not that painful.
There are a few other refactorings in this commit that perhaps should be
split out (how the bond parameters are handled, some stuff about
resizing the table rows when interfaces are edited) but it doesn't
really seem worth it.
Olivier Gayot