[Bug 1714933] Re: Xenial: Please roll SRU with upstream fix for networkd to "accept colons in network interface names"

[Dimitri John Ledkov]

With 232-21ubuntu5

Oct 10 08:04:08 darling-stud systemd-networkd[401]:
[/run/systemd/network/10-netplan-eth0.network:12] Interface label is not
valid or too long, ignoring assignment: xo:xo

With 232-21ubuntu7
inet 10.0.0.1/8 brd 10.255.255.255 scope global xo:xo -> got assigned with correct label.

** Tags removed: verification-needed verification-needed-zesty
** Tags added: verification-done verification-done-zesty

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https://bugs.launchpad.net/bugs/1714933

Title:
  Xenial: Please roll SRU with upstream fix for networkd to "accept
  colons in network interface names"

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Zesty:
  Fix Committed
Status in systemd source package in Artful:
  Fix Released

Bug description:
  [Impact]
  networkd cannot manage interface names with ':' in them. As used commonly, by convention, by other tools.

  [Fix]
  Update networkd validation routines and test-suites to accept network interface names with ':' in it.

  [Testcase]
  Create an inteface with ':' in its name and use it anywhere where systemd validates ifname. E.g. Socket BindToDevice definition, nspawn network zone info, Label= in [Address] section in networkd.

  [Regression Potential]
  This fix will change validation routines, and thus commands or settings that were previously rejected or ignored will now take effect. Specifically Label= settings in networkd may lead to networking conflicts. The justification for this change is that networkd should really use the sensible ':' ifnames that the user is requesting systemd to use.

  [Original Bug Reprot]
  PR: https://github.com/systemd/systemd/pull/5117

  issue: https://github.com/systemd/systemd/issues/4057

  Before the networkd from 231 was backported, it was possible to use
  interface alias names that contained a colon, e.g. eth0:1. This is
  commonly used to make legacy tools like "ifconfig" work, because they
  *expect* a colon in the interface name.

  Martin told me to file a bug for this.

  Merging networkd from 231 lead to a regression where valid configs
  were not accepted anymore after the backport. Please merge that fix
  for the regression.

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