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When copying the image data to the VM's hard disk, use iflag=fullblock
to accumulate full blocks of input. Without this flag, dd will write
the read data whenever read() syscall returns, without waiting to gather
enough data to create a bs-sized block. This may lead to unoptimized
performance.

Pass -s flag to kpartx to fix a potential race condition when deploying
(ext|ntfs)dump images. Without -s, kpartx will return right after
signaling the device mapper to create the partition block devices. This
does not guarantee that the partitions will have been created when
snf-image will try to use them.

Add support for resizing UFS file systems of NetBSD OSes

When enlarging OpenBSD partitions, round them up to multiples of 16512
which is the default fs blocksize. This is what OpenBSD's disklabel
does when creating partitions.

The mapping we used would fail in some cases. If a BSD partition
has the same boundaries with an MBR one, the kernel will not map it
onto a different block device. As a result, partition 'a' is sometimes
mapped onto /dev/sda1 and sometimes onto /dev/sda5.

Add an input option in disklabel.py to print the partition mapping the
Linux kernel would do on the disklabel.

 * Implement new NetBSDDisklabel and FreeBSDDisklabel classes that
   subclass BSDDisklabel class.
 * Add methods for enlarging the disk and the last partition in
   NetBSDDisklabel

This method converts an LBA address to CHS. Different BSD systems do
this in different ways:

 * NetBSD uses LBA-Assisted translation but OpenBSD does not.
 * For addresses over 8GB where CHS will overflow, OpenBSD will assign
   a fixed value on all 3 CHS fields when NetBSD will do this only for
   the cylinders field.

Make PartitionTableBase and DisklabelBase classes abstract by using the
ABCMeta metaclass of the abc module

 * Add missing method comments
 * Inline all MBR fields comments
 * Print partition type in hex

Add basic support for traditional BSD disklabels

 * Create a DisklabelBase class that the two Disklabel classes will
   subclass
 * Move common code to the base class
 * Cleanup the derived classes

Create a PartitionTableBase class that will host the common code for the
PartitionTable classes of the two Disklabel classes.

Add the partition table fields and the format field for the BSDDisklabel
class. The body of the class is not implemented yet.

Add a main() function that works as entry point and rephrase the help
text in some input options.

The Disk class hosts the partitioning info of a Disk, namely an MBR
instance as well as a Disklabel instance.

For disklabels define 2 different classes:

 * BSDDisklabel
 * OpenBSDDisklabel

The first represents the traditional *BSD disklabel and the latter the
altered version found in newer releases of OpenBSD.

For now, only OpenBSDDisklabel is implemented.

 * Fix various spelling errors
 * Add module comments on all python utilities

 * Add instructions for manually creating `/var/lib/snf-image/helper'
   directory when installing the software from source.

 * Remove instructions for installing Debian Squeeze packages (Debian
   Squeeze is no longer supported)

Add a section where it is explained how snf-image can be configured
via the /etc/default/snf-image file.

Add checks for tune2fs, sfdisk, sgdisk and eatmydata

Use hivexget and hivexregedit instead of reglookup and chntpw to browse
and alter the windows registry. The hivex utilities are better designed
and maintained

snf-image does not make any use of this utility any more

The default Virtual RAM size for the helper VM used to be 256MB

In the image directives always use relative paths for images that are
hosted inside the project's repository.

bump version to 0.13next

* Add links for downloading NetBSD and OpenBSD images
* Remove the reference to the partition extending limitation for OpenBSD

Add an extra check to determine if the user gave the correct
ROOT_PARTITION property