Command to list commits that point to a given tree.

Hi,

Normally, the natural thing to do is to dereference objects in the
following directions:

commit -> tree
tag    -> commit
tag    -> other object

However, sometimes it is convenient to look in the other direction.  The
command git-name-rev satisfies this need partially by listing symbolic
names for given commits.

Is there a command that can do this more generally?  In particular, I am
looking for a command that will return a list of commits that point to a
particular tree.

Right now I plan to brute force it.  Basically, I will call git-rev-list
to list the commits and, for each commit, map it to a tree.  Then, I
will reverse the map in order to be able to look up a commit based on
the tree.

I was thinking, though, that it might be somewhat useful in general to,
at least, provide a command for the following:

- Given a blob, list the tree and/or tag objects that reference that
  blob.

- Given a tree, list the tree, commit and/or tag objects that reference
  it.

- Given a commit, list the commit and/or tag objects that reference it.

Carl

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 Carl Baldwin                        RADCAD (R&D CAD)
 Hewlett Packard Company
 MS 88                               work: 970 898-1523
 3404 E. Harmony Rd.                 work: Carl.N.Baldwin@hp.com
 Fort Collins, CO 80525              home: Carl@ecBaldwin.net
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