[Libguestfs] Fwd: [PATCH] v2v: virtio-win: include *.dll too

[Richard W.M. Jones]

In terms of turning what Vadim wrote into code ...

> First of all you will need to obtain the Windows kernel version by
> reading the following Registry key -
> "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion". Let's say it
> 6.3, which means that it is Win8.1 or WS2012R2,

We already access this field in the registry and present it through
inspection, so:

http://libguestfs.org/guestfs.3.html#guestfs_inspect_get_major_version

In virt-v2v this is present in the Types.inspect.i_major_version and
Types.inspect.i_minor_version fields.

> parsing "BuildLabEx"
> string from the same hive will give you information about the platform
> bitness.

Currently we can determine the bitness of a Windows VM by examining
some of the binaries found in %systemroot%.  We present this through
inspection:

http://libguestfs.org/guestfs.3.html#guestfs_inspect_get_arch

(either "i386" or "x86-64") and this is present in virt-v2v in the
Types.inspect.i_arch field.

I looked at BuildLabEx, which is a field we've not looked at before.
>From Windows 7:

  "BuildLabEx"="7601.18247.amd64fre.win7sp1_gdr.130828-1532"

Apparently the first four numbers are the build number, next five are
the revision number, and after that is either ".amd64" or ".x86" (for
x86-64 or i386 respectively).

> Next you need to go through inf files, and find "DriverVer"
> string, like this one . taken from from vioscsi.inf
> 
> DriverVer=08/01/2015,62.72.104.10800
>
> This string contains build time and version stamps. The version stamp
> looks as follow "62.72.104.10800"
> where 62 means a target Windows kernel version multiplied by 10. In this
> case it is 6.2 which means Win8 or WS2012
> 72 - the target host platform version multiplied bu 10 (was RHEL7.2)
> 104 just a magic number, but it can be changed, don't make any
> assumption based on this number.
> 10800 our internal build number (build 108) multiplied by 100
> If you found an inf file with the matching minor OS (6 in our case)
> version and matching or less but close minor version number (2 vs 3)
> then you are in the right directory.

This should be easy enough to parse out.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
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