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Fix a bug in export script where the check of whether to use the
$EXP_SIZE_FD file descriptor was wrong.

This fixes #47

OS Parameters defined as command-line arguments should overwrite the
ones given in the variants file.

Many thanks to Brian Candler https://github.com/candlerb for the
suggestion and all the help.

Many thanks to Brian Candler https://github.com/candlerb for pointing
this out. This fixes #39

If the parameter is not defined then the ChangePassword task will not
run at all.

This resolves #34

If the variant file has defined mandatory input variables like IMG_ID
the verification script should not fail to find them.

This fixes #35

snf-image wasn't working correctly with API versions prior to 20 anyway.

Replace all references of `environmental variable' with `environment
variable'

Handle better possible backend options and require necessary
ones by printing appropriate error messages.

Synnefo version 0.15.1 has introduced a selectable storage backend
for Pithos, resulting in necessary changes to the ModularBackend class.
In order to keep backward compatibility with older Synnefo versions,
we check the Pithos backend version and instantiate the ModularBackend
class appropriately.

Add Chrysostomos Nanakos to the list of snf-image authors

Set default values for Pithos storage backend type, RADOS conf file,
RADOS map and block pools.

Include new Pithos variables for selectable storage backend to Ganeti
create script.

Introduce new Pithos variables for selectable storage backend.

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.

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

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

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

This can be used to overwrite the size of the virtual RAM that will
be given to the helper VM

Fix a bug where API params like CONFIG_URL or IMG_PASSWORD where
checked and used by scripts other that `create' (e.g. `import' and
`export'). This may lead to errors. The CONFIG_URL may not be valid
after the image creation

During ./configure check that python >= 2.6 as well as prctl and
scapy python modules are present in the system

This is the default password hashing method for NetBSD.

This is not supported by the Linux version of crypt and is needed
for NetBSD and OpenBSD. Add a new python-bcrypt packet in the helper
that implements the OpenBSD Blowfish password hashing algorithm.

There was a debug print in pithcat causing problems

Make sure to inform the users that the preferred way to define the
db url is through the PITHCAT_INPUT_DB environmental variable

Echo IMG_NAME and IMG_TYPE so they get written in the ganeti os log
file. This is handy for debugging

The id now should contain the relative path from the HELPER_DIR to
the image filename, including the image-type extension if needed.

Add extra code to check if the image path ends up being outside the
IMAGE_DIR directory

This used to be file://