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[RFC] Reporting index properties


As part of gathering some automated performance statistics of git, it
would be useful to be able to extract some vital properties of the
index.  While `git update-index` has ways to _set_ the index version,
and enable/disable various extensions, AFAICT there is no method by
which one can ask for reporting about the current state of them --
short of re-implementing all of the index-parsing logic external to
Git, which is not terribly appealing.

I hesitate to propose adding a flag to `git update-index` which reads
but does no updating, as that seems to make a misnomer of the
command.  But this also doesn't seem worthy of a new top-level command.

Do folks have feelings about surfacing this information, and where such
logic should live?

 - Alex