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

[Michael Hudson-Doyle]

Yes I guess this is a race where the symlink is not in place by the time
the copy runs. It's a bit hard to be believe but it looks like this case
threads its way through the casper code without hitting a udevadm
settle, so presumably adding one somewhere would make it work. OTOH it
can take a surprisingly long time for devices to show up at all (this is
why there is a loop around the calls to find_livefs) so maybe we should
have a loop waiting for ${live_dest} to appear too.

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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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