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Theoretically, if an image contains an XFS filesystem with no free
space, the deployment will fail unless the FilesystemResizeMounted
tasks runs before any other mounted task. The only exception to this
is InstallUnattend which the task depends on.

This can be used to license a Windows deployment

Make sure that the file always contains a "[Commands]" section.

Do not expect the ChangeAdminPassword.cmd and diskpart.exe
RunSynchronousCommand entries to be present in the Unattend.xml file.
Check for their presence and add them if needed.

Add a new OSFAMILY for Windows OSes prior to Windows Vista that use the
old Windows NT sysprep format. For now, this is only tested in Windows
Server 2003 and Windows XP

Add a mechanism were scripts from within the image can be executed
instead of the original Configuration Tasks.

Use check_yes_no() to test if a boolean property is set.

Although the documentation states that to set a boolean image property
you need to assign the "yes" value to it, this function will accept
"yes", "true", 1, "on" and "set" in a case-insensitive way and reject
"no", "false", 0, "off" and "unset".

An empty or not-set variable is treated as false.

An unknown value will raise a warning but will be accepted. This is done
to protect the users because prior to this commit, in some cases we only
tested if an image property had a non-empty value.

This resolves #80

Introduce support for Windows XP / Server 2003 Images.

To do this:
    * Extend common.sh and 40InstallUnattend so they can also detect
      Windows XP / Server 2003 SYSPREP.INF answer files.
    * Extend 50AssignHostname so it can set the hostname inside
      SYSPREP.INF, based on a small handle-ini-file.py utility.
    * Remove the seemingly unnecessary addition of /LOGONPASSWORDCHG:NO,
      which is unsupported under XP / Server 2003. More on this below.
    * Warn the user about Windows XP / Server 2003 not supporting
      online NTFS resize, and the need to use OFFLINE_NTFSRESIZE
      instead.

Regarding the use of /LOGONPASSWORDCHG:NO while using NET USER
to change a user password:
    * This argument is unsupported under Windows XP / Server 2003,
      see http://blog.johnmuellerbooks.com/2011/04/12/working-with-net-user/
    * Its default value is "NO" anyway, so it shouldn't make a
      difference whether it is explicitly specified in the command line
      or not:
      https://answers.microsoft.com/en-us/windows/forum/windows_vista-security/setting-up-passwords-for-new-users/1704349b-31a3-4340-ae9e-1473c5adb919
    * Even if the security policies of a specific Image were set up
      in such way that users *were* required to change their passwords
      immediately upon their first logon, it is not snf-image's job
      to modify this behavior by specifying /LOGONPASSWORDCHG:NO.
      The password policy is Image-specific, and snf-image shouldn't
      mess with it.

If this property is defined, then only the tasks that are meant to run
before the VM's disk gets mounted (namely FixPartitionTable and
FilesystemResizeUmounted) will be allowed to run during deployment.

This resolves #77

 * Rename the image property INSTALL_DEFAULT_UNATTEND to
   IGNORE_UNATTEND.
 * Add documentation about this property

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

Make sure the cached unattend xml file gets deleted after sysprep

AssignHostname task did not search for Unattend.xml in a case
insensitive way.

If unattend.xml is present in the windows image, use this one unless
USE_DEFAULT_UNATTEND is specified as an image property.

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.

 * 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

This commit extendes the monitoring mechanism to include events from
snf-image-helper.

snf-image-helper by default uses it's own version of unattend.xml file,
but if UNATTEND variable is specified then it will use the one provided
by snf-image-host.

The password is applied in oobeSystem and RDP is enabled in a previous
pass. I Also did a cleanup on the windows tasks.

 * Make all "local" variables lowercase.
 * Move HELPER_EXTRA_PKGS from snf-image-update-helper to common.sh
 * Protect all variables from spaces and other special chars
 * Remove extra X's from mktemp template names (only 6 are supported).
 * Make sure pipelines fail if any command (not only the rightmost)
   fails

Also add Changelog and COPYING info

This is causing problems to run-parts

  * Make sure mount & umount are helper vm tasks themself

Use SNF_IMAGE_ as prefix for the floppy exporting variables