[Bug 1737570] Re: Add support for RequiredForOnline in networkd

[Dimitri John Ledkov]

Using xenial lxd container, migrating to networkd using netplan, and
updating generated .network file to include RequiredForOnline=false, i
can see that it is correctly ignored.

# dpkg-query -W systemd
systemd	229-4ubuntu21.2

# /lib/systemd/systemd-networkd-wait-online --timeout=5
ignoring: lo
ignoring: eth0
Event loop failed: Connection timed out


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

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https://bugs.launchpad.net/bugs/1737570

Title:
  Add support for RequiredForOnline in networkd

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Zesty:
  Won't Fix
Status in systemd source package in Artful:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * netplan & networkd based systems typically await networking to be
  up on boot, without any ability to specify that an interface should be
  configured, but might not be online at boot. This is a backport of the
  RequiredForOnline= feature to match optional=true in netplan.

  [Test Case]

   * Configure a netowkring interface using .link/.network file and specify RequiredForOnline=False
   * Bring the interface down / offline it
   * execute systemd-networkd-wait-online, which should exit immediately since no interfaces are required to be online

  [Regression Potential]

   * This adds a support for an additional stanza in the network files.
  This stanza is not used by default. if the stanza is used, but older
  networkd is in use, networkd will ignore this unknown stanza. Thus
  this change is backward and forward compatible. The difference is that
  boot is not blocked awaiting systemd-networkd-wait-online to timeout.

  [Other Info]
   
   * Original bug report

  Add support for RequiredForOnline in networkd

  https://github.com/systemd/systemd/commit/c1a3890410f043fe09af8b139eb6bfe2832089be

  RequiredForOnline= denotes a link/network that does/does not require being up
  for systemd-networkd-wait-online to consider the system online; this makes it
  possible to ignore devices without modifying parameters to wait-online.

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