[PVE-User] cloudbase-init bug or PVE's cloud-init function ?

[lyt_yudi]

first, I know that this bug might be cloudbase's own.

but, here
Recognize uppercase vfat disk labels
New mkfs.vfat and fatlabel tools included in the dosfsutils package no
longer support creating vfat disks with lowercase labels. They silently
default to an all uppercase label eg CONFIG-2 instead of config-2. This
change makes cloud-init handle either upper or lower case.
https://github.com/openstack/cloudbase-init/commit/24365043e31a7cb0899d2222bbba654ef718da5b <https://github.com/openstack/cloudbase-init/commit/24365043e31a7cb0899d2222bbba654ef718da5b>

while test with cloudbase-init in windows 2008R2, It might have something to do with it 

2018-03-24 16:43:50.453 1444 DEBUG cloudbaseinit.metadata.services.osconfigdrive.windows [-] Looking for Config Drive vfat in hdd get_config_drive_files c:\program files\cloudbase solutions\cloudbase-init\python\lib\site-packages\cloudbaseinit\metadata\services\osconfigdrive\windows.py:197
2018-03-24 16:43:50.546 1444 DEBUG cloudbaseinit.utils.windows.vfat [-] Could not retrieve label for VFAT drive path '\\\\.\\PHYSICALDRIVE0' is_vfat_drive c:\program files\cloudbase solutions\cloudbase-init\python\lib\site-packages\cloudbaseinit\utils\windows\vfat.py:46
2018-03-24 16:43:50.546 1444 DEBUG cloudbaseinit.utils.windows.vfat [-] mlabel failed with error b"init :: sector size (190) not a small power of two\r\nCannot initialize '::'\r\nC:\\Program Files\\Cloudbase Solutions\\Cloudbase-Init\\bin\\mlabel: Cannot initialize drive\r\n" is_vfat_drive c:\program files\cloudbase solutions\cloudbase-init\python\lib\site-packages\cloudbaseinit\utils\windows\vfat.py:47
Thanks!