[Bug 531599] Re: device mappings for partitions not removed after build using --raw, leading to filesystem corruption

[Louis Bouchard]

I have been able to test a potential fix for this problem.  The unmap()
function is responsible for tearing apart the device maps created by the
kpartx commands. Those are created by the map_partitions() function.

While tearing down the device maps created by the parted command, which
is invoked in the partition() function might be better done by a
callback in the partition() function, the patch is simpler by adding to
the existing unmap() which is a callback from map_partition, which is
invoked sequentially after partition() in hypervisor.py.

Please let me know if the patch in the proposed branch is unacceptable.

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https://bugs.launchpad.net/bugs/531599

Title:
  device mappings for partitions not removed after build using --raw,
  leading to filesystem corruption

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