[Bug 1884933] [NEW] Backport casper from groovy to support interactive network boot on focal

[Dimitri John Ledkov]

Public bug reported:

[Impact]

 * With legacy-server iso in focal it is possible to network boot and interactively setup networking configuration.
 * This feature lacks in the initrd used by subiquity, and thus is not available on the live-server.
 * This feature is now implemented in groovy and has been tested to work on multiple architectures, including s390x specific hardware (zdev code path)
 * Backport this feature to focal for 20.04.1

[Test Case]

 * Build live-server iso with proposed pocket enabled

 * Download just the kernel & initrd artefacts

 * Boot kerenl & initrd and specify ignore_uuid kernel cmdline
parameter, but nothing about ip= or url= and _without_ any subiquity iso
attached.

 * Wait for boot to offer to perform network boot, configure networking,
and accept default url, await to be booted to subiquity welcome screen

[Regression Potential]

 * Previously when booting kernel/initrd without iso attached to the
machine, the boot would fail and drop to emergency shell. Now
interactive network setup is offered, and if that fails, then drop to
emergency shell. So whilst there is added interactivity, eventually
dropping to emergency shell is still there.

[Other Info]
 
 * There are many other bug reports requesting this feature, all of which will be closed once this update lands on the daily isos.

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1884933

Title:
  Backport casper from groovy to support interactive network boot on
  focal

Status in casper package in Ubuntu:
  New

Bug description:
  [Impact]

   * With legacy-server iso in focal it is possible to network boot and interactively setup networking configuration.
   * This feature lacks in the initrd used by subiquity, and thus is not available on the live-server.
   * This feature is now implemented in groovy and has been tested to work on multiple architectures, including s390x specific hardware (zdev code path)
   * Backport this feature to focal for 20.04.1

  [Test Case]

   * Build live-server iso with proposed pocket enabled

   * Download just the kernel & initrd artefacts

   * Boot kerenl & initrd and specify ignore_uuid kernel cmdline
  parameter, but nothing about ip= or url= and _without_ any subiquity
  iso attached.

   * Wait for boot to offer to perform network boot, configure
  networking, and accept default url, await to be booted to subiquity
  welcome screen

  [Regression Potential]

   * Previously when booting kernel/initrd without iso attached to the
  machine, the boot would fail and drop to emergency shell. Now
  interactive network setup is offered, and if that fails, then drop to
  emergency shell. So whilst there is added interactivity, eventually
  dropping to emergency shell is still there.

  [Other Info]
   
   * There are many other bug reports requesting this feature, all of which will be closed once this update lands on the daily isos.

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