[Bug 39425] Improve resilience to VM host outages

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=39425

François Gouget <fgouget at codeweavers.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #1 from François Gouget <fgouget at codeweavers.com> ---
This is fixed.

All VM operations now go through LibvirtTool.pl. This avoids the blocking calls
in the TestBot Engine also dealing with resetting the broken connections in the
Engine.

In addition to the old revert and poweroff operations LibvirtTool.pl now has a
monitor operation specially to deal with offline VMs and detecting when they
become available again. Most of the time this works just fine and VMs are pout
back online automatically but there are still a few cases where this process
can get stuck.

The way to deal with those cases is going to be to have the Testbot Engine kill
stuck processes. But that's a more general issue (see bug 44688) so I'm
considering this one to be fixed.

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