After doing some test to identify what is creating this duplicate set of
dm maps, it seems to be the following 'parted mkpart' commands that
triggers the udev rule :
>From /usr/share/pyshared/VMBuilder/disk.py :
def create(self, disk):
"""Adds partition to the disk image (does not mkfs or anything like
that)"""
logging.info('Adding type %d partition to disk image: %s' %
(self.type, disk.filename))
run_cmd('parted', '--script', '--', disk.filename, 'mkpart',
'primary', self.parted_fstype(), self.begin, self.end)
running the equivalent command while watching the dm tables does show a
new table entry when the 'parted --script {dev} mkpart primary ext2
{beginning} {size}' command is invoked.
Currently, it is unclear to me if the removal of those unnecessary dm
entries should be done by a callback from create() or included in the
existing unmap() callback for map_partitions.
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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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