[Bug 1868329] Re: ifupdown does not render viable /etc/network/interfaces on bionic ec2 cloud-images

[Chad Smith]

** Also affects: ifupdown (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: ifupdown (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: ifupdown (Ubuntu Eoan)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1868329

Title:
  ifupdown does not render viable /etc/network/interfaces on bionic ec2
  cloud-images

Status in ifupdown package in Ubuntu:
  New
Status in ifupdown source package in Bionic:
  New
Status in ifupdown source package in Eoan:
  New
Status in ifupdown source package in Focal:
  New

Bug description:
  Filing this bug for clarification and tracking on Ubuntu Bionic and
  later.

  Canonical cloudimages for Ec2 and other clouds leave an artifact that
  disables /etc/network/interface with the following content:

  # ifupdown has been replaced by netplan(5) on this system.  See
  # /etc/netplan for current configuration.
  # To re-enable ifupdown on this system, you can run:
  #    sudo apt install ifupdown

  In following the suggested text, installing the ifupdown deb continues
  to leave a broken system because ifupdown.postinst script creates an
  /etc/network/interfaces.d parts directory but does not write out a
  working /etc/network/interfaces file if the file exists on the system.

  This leaves a broken /etc/network/interfaces files which doesn't
  source /etc/network/interfaces.d/* and 3rd parties cannot use the
  interfaces.d parts directory to extend networking config.

  Cloud-init is one of those users of /etc/network/interfaces.d/ for
  rendering system networking on cloud images. Per LP: #1867029

  I have attached ifupdwown-test.sh which exercises this issue on lxc by
  mocking the CPC cloudimage artifact.

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