[Bug 1827357] [NEW] SRU subiquity specific changes from master to bionic

[Dimitri John Ledkov]

Public bug reported:

[Impact]

 * SRU subiquity image specific changes in livecd-rootfs to fix
installer issues.

[Test Case]

  * subiquity: make subiquity_config.mount optional.

    1) boot subiquity image
    2) observe that there are no boot messages mentioning failed to start subiquity_config.mount

  * Make serial-subiquity@ use the same codepath as tty1 subiquity.

    1) boot subiquity image on an architecture with a serial console, e.g. ppc64el KVM, s390x KVM.
    2) observe that the boot goes straight to subiquity, without multiple attempts of failing to start it, crash, try again, crash, snaps get seeded, success.

  * Fix ubuntu-server-live images to generate initrd with casper UUID.

    1) mount iso
    2) check that it contains uuid file
    cat /mnt/.disk/casper-uuid-generic
    3) unpack initrd
    unmkinitramfs /mnt/casper/initrd /tmp/tmp.AGwIMQfj0j
    4) check that it also contains uuid:
    cat /tmp/tmp.AGwIMQfj0j/main/conf/uuid.conf
    5) check that uuid form #2 and #4 are the same

[Regression Potential]

 * This is a livecd-rootfs upload that may impact building images. The
code touched here affects ubuntu-server-live images only. This SRU
should be reviewed and accepted, server-live images spun and checked as
per the above testcases.

[Other Info]
 
 * All changes are cherrypicks from disco/eoan.

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New

** Merge proposal linked:
   https://code.launchpad.net/~xnox/livecd-rootfs/+git/livecd-rootfs/+merge/366819

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https://bugs.launchpad.net/bugs/1827357

Title:
  SRU subiquity specific changes from master to bionic

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  [Impact]

   * SRU subiquity image specific changes in livecd-rootfs to fix
  installer issues.

  [Test Case]

    * subiquity: make subiquity_config.mount optional.

      1) boot subiquity image
      2) observe that there are no boot messages mentioning failed to start subiquity_config.mount

    * Make serial-subiquity@ use the same codepath as tty1 subiquity.

      1) boot subiquity image on an architecture with a serial console, e.g. ppc64el KVM, s390x KVM.
      2) observe that the boot goes straight to subiquity, without multiple attempts of failing to start it, crash, try again, crash, snaps get seeded, success.

    * Fix ubuntu-server-live images to generate initrd with casper UUID.

      1) mount iso
      2) check that it contains uuid file
      cat /mnt/.disk/casper-uuid-generic
      3) unpack initrd
      unmkinitramfs /mnt/casper/initrd /tmp/tmp.AGwIMQfj0j
      4) check that it also contains uuid:
      cat /tmp/tmp.AGwIMQfj0j/main/conf/uuid.conf
      5) check that uuid form #2 and #4 are the same

  [Regression Potential]

   * This is a livecd-rootfs upload that may impact building images. The
  code touched here affects ubuntu-server-live images only. This SRU
  should be reviewed and accepted, server-live images spun and checked
  as per the above testcases.

  [Other Info]
   
   * All changes are cherrypicks from disco/eoan.

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