[wpkg-users] RFC: WMI checks

[Malte Starostik]

Hi,

I'm currently preparing a migration from XP/2003 to Windows 7/2008 R2 and one 
thing that affects Windows Updates is that there is no longer a simple 
registry check available as in HKLM\SOFTWARE\Microsoft\Updates\...

I've hacked together a very basic implementation of a new check type "wmi" 
that allows to query (surprise) WMI objects as a basis for package checks.

What currently works is an "exists" check that interprets the check's "path" 
attribute as an object path and checks whether such an instance exists.

Example usage:
 <check type="wmi" condition="exists" 
path="Win32_QuickFixEngineering.HotFixID='KB976902',ServicePackInEffect=''"/>

One obvious enhancement would be to a "condition" that allows for "path" to 
contain a complete WQL query.  But before considering this further and what 
combinations of condition/path/value would make sense, I'd like to check if 
there is any interest in this at all and if it has a chance to make it into 
WPKG.

I'm aware that execute checks with wmic or custom scripts can be used here, 
but such an approach would come with a very high performance penalty when it's 
trivial to run the check right from WPKG.

Regards,
Malte
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