[PATCH 0/3] qga/win/vss: add VSS backup type options

[Kfir Manor]

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/775

The problem, VSS backup type VSS-FULL (the only available VSS backup type 
currently) can break other backups that use VSS-FULL(for example, 
Bareos-Fullbackup).

Fix, add other backup types.

Implementation, put the desired backup type number inside Regkey value 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\QEMU Guest Agent VSS 
Provider\VssOption, so that the program can query the desired backup type.

VSS backup types:
number   type
1        VSS_BT_FULL
2        VSS_BT_INCREMENTAL
3        VSS_BT_DIFFERENTIAL
4        VSS_BT_LOG
5        VSS_BT_COPY

for more information about the different backup types 
https://learn.microsoft.com/en-us/windows/win32/vss/vss-backup-state

Additionally, the program would work as before with VSS-FULL in cases where 
VssOption doesn't exist, or VssOption value isn't a known backup type.

Kfir Manor (3):
  add VssOption to installer
  query VSS backup type
  requester_freeze changes

 qga/installer/qemu-ga.wxs   |  4 ++++
 qga/vss-win32/requester.cpp | 41 ++++++++++++++++++++++++++++++++++++-
 qga/vss-win32/vss-handles.h |  3 +++
 3 files changed, 47 insertions(+), 1 deletion(-)

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2.38.1