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If snf-image-update-helper exits with errors, delete the temporary
image file from /var/lib/snf-image/helper.

multistrap is more flexible allows as to define more that one
repository to retrieve packages from.

the kernel and init paths computed by snf-image-update-helper script
were incorrect.

Make snf-image-helper ran as init process when calling the helper
VM. Also make the helper VM shut down quickly by using the shut off
SysRq.

if this is set, then snf-image will run in debug mode.

Drop the rule that resets the password for user with username `user'
if the USERS image property is missing and the system is detected
to be a Fedora or a Ubuntu Linux system.

The curl dependency is not optional any more.

This url points to a json file that contains the value for other
OS parameters. Using this file we can pass parameters to snf-image
without writting them in Ganeti's config.data. This is
useful, for 2 reasons:
* Privacy: We don't want the password to appear in the Ganeti config
* Speed: Some parameters like IMG_PERSONALITY can be quite large (a few
KB) and since ganeti shares the instance configuration among different
nodes, the overall system will start getting slower if many instances
with IMG_PERSONALITY exist.

When a users inject a file in an image that already exists,
we want to make sure that this file is not altered by any other task.
So, the EnforcePersonality task, is the last task that should run
before the image is unmounted.

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.