[Bug 1938325] [NEW] adt failure: '/cdrom not ext4 with todisk'

[Dan Bungert]

Public bug reported:

Autopkgtest will sometimes fail in the todisk test with the following error at the end:
++ echo '/cdrom not ext4 with todisk'

Earlier in the log file, you can also see this log message from casper:
Begin: Copying live_media to /dev/disk/by-label/scratch ... Warning: /dev/disk/by-label/scratch is not a block device.

In addition to the test flakiness, it makes one wonder if there is some
sort of race here between casper and other components that may be user
visible.

Example log:
https://autopkgtest.ubuntu.com/results/autopkgtest-impish/impish/amd64/c/casper/20210623_113006_12e97@/log.gz

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

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https://bugs.launchpad.net/bugs/1938325

Title:
  adt failure: '/cdrom not ext4 with todisk'

Status in casper package in Ubuntu:
  New

Bug description:
  Autopkgtest will sometimes fail in the todisk test with the following error at the end:
  ++ echo '/cdrom not ext4 with todisk'

  Earlier in the log file, you can also see this log message from casper:
  Begin: Copying live_media to /dev/disk/by-label/scratch ... Warning: /dev/disk/by-label/scratch is not a block device.

  In addition to the test flakiness, it makes one wonder if there is
  some sort of race here between casper and other components that may be
  user visible.

  Example log:
  https://autopkgtest.ubuntu.com/results/autopkgtest-impish/impish/amd64/c/casper/20210623_113006_12e97@/log.gz

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