[Bug 39415] Make configuration settings accessible through the website

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=39415

--- Comment #1 from François Gouget <fgouget at codeweavers.com> ---
One way to handle this would be to add a table like this:
  PK  Class      # User, VMHost, VM, etc.
  PK  Object     # User name / Hostname / VM name, etc.
  PK  Property   # Name of a property of the above object
      Value      # Value for that property

The point of the Class column is to avoid collisions between the properties of
the w1064 VM and those of a malicious w1064 user: the class would ensure they
resolve to ('VM', 'w1064', ...) and ('User', 'w1064', ...) respectively.

Then the API to access those should provide automatic fallbacks so if a the
SleepAfterRevert property is not specified at the VM-level, either the VM-host
one or the global one is used:

  my $Props = GetProperties(['VM', 'w1064'], ['VMHost', 'vm2'], ['Global',
'VMHosts']);
  print $Props->{SleepAfterRevert}, "\n";

Should the need arise for array properties (maybe to store user preferences
like VMs to run the tests on) the convention could be to suffix the property
name with ":array" and then ":N" for each entry (colons would otherwise be
forbidden in property names).

GetProperties() would likely provide access to a singleton object that loads
all of a given object's properties at once and then caches them for a few
seconds so that iterating over VMs (for instance) does not cause the VMHost
properties to be reloaded each time (this assumes the Perl ORM does not provide
such functionality).

Of course a SetProperty() method would update the cache appropriately, but of
course that does not help other processes, hence the short-duration case.

Interestingly this new table would have no link to the other TestBot tables,
making this a good testing ground for Perl ORM tests.

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