[MacPorts] #56028: Buildbot: Save port version, variants and commit that the port being built belongs to

[MacPorts]

#56028: Buildbot: Save port version, variants and commit that the port being built
belongs to
---------------------------+---------------------
 Reporter:  mojca          |      Owner:  admin@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 While trying to extract some statistics it turned out that it's somewhat
 non-trivial to:
 * extract the port version and variants of the current build (without
 downloading and parsing tons of logs)
 * figure out which commit the port actually belongs to (as well as which
 commit was used for `portindex`)
   * it can be that 10 commits were made at the same time and it would be
 handy to have a link to git commit that was actually used (which one of
 those 10 commits did it come from?); additionally it may be that the port
 was modified by a later commit, so we probably need to execute something
 like `git log <path/to/portdir>` and extract the commit info from there

 `mpbb` would need to return that information and buildbot master should
 probably store it in properties or somewhere else to make it easily
 accessible.

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Ticket URL: <https://trac.macports.org/ticket/56028>
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