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It is no longer needed

This backend type can be used if we want snf-image to configure the
VM disk without first copying an image to it. This is useful for
cases were the VM disk is already populated before snf-image runs.

Newer arch linux systems use this file to assign a hostname. If the
file is present and not empty, then use it.

 * Fix distro detection code to detect arch linux systems
 * Fix AssighHostname hook to successfully assign the host name on
   arch linux systems

This program is used to output info and error messages from the host.

This programm will get the stderr file as input and it will create a
json image-error msg

snf-image-host can output info messages using the log_info function.

Change msg field to messages in monitoring messages with type
image-helper and subtype error or warning. The new field is a list
of strings.

Change sys.stdin.readline with os.read

Progress monitor program needs to know the instance name, which is
provided by ganeti_os_main.

A `{' was missing in the beginning of the json string of the message
with type `error'.

This program transforms raw helper monitor messages into json strings
under very strict rules. This reduces security concerns since the
helper VM output cannot be trusted.

 * Make sure `img_format', `img_passwd' and `img_id' are passed
 * If format is `diskdump', require the `img_properties` parameter

Defining EXCLUDE_TASK_DeleteSSHKeys is the same as defining
EXCLUDE_TASK_DELETESSHKEYS

 * Change the monitor message type names once again (hope this is
   the final version)
 * Pass -u (unbuffered) to sed to retain the actual output order in
   the log file
 * Fix a bug in helper code where the starting `{' was missing from
   the monitoring messages

The latter is part of gnu coreutils.