[Bug 865529] [NEW] [PATCH] mapper and mdadm fail at boot

[Tyler Gates]

Public bug reported:

Booting from a CD in a local environment with mdadm or lvm devices
(/dev/md* and /dev/mapper/*) that have file systems created on them
causes casper to fall back to the 'ugly hack' section in find_livefs().
This in turn returns the livefs_root variable to be these devices which
will cause the boot process to panic since it can't find the appropriate
file structure.

The attached patch will check if these devices exist and run check_dev
on them (just as the rest of the code does for other types of devices)
to determine if they are a valid livefs device. Then, if a valid livefs
is not found on the block device, the 'ugly hack' can be honored.

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

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https://bugs.launchpad.net/bugs/865529

Title:
  [PATCH] mapper and mdadm fail at boot

Status in “casper” package in Ubuntu:
  New

Bug description:
  Booting from a CD in a local environment with mdadm or lvm devices
  (/dev/md* and /dev/mapper/*) that have file systems created on them
  causes casper to fall back to the 'ugly hack' section in
  find_livefs(). This in turn returns the livefs_root variable to be
  these devices which will cause the boot process to panic since it
  can't find the appropriate file structure.

  The attached patch will check if these devices exist and run check_dev
  on them (just as the rest of the code does for other types of devices)
  to determine if they are a valid livefs device. Then, if a valid
  livefs is not found on the block device, the 'ugly hack' can be
  honored.

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