Re: Enumerating all objects in the Git object store

[Michael J Gruber <git@drmicha.warpmail.net>]

Paul Richards venit, vidit, dixit 26.03.2010 16:31:
> Hi,
> I'd like to visualize the objects in a Git repository using Graphviz
> and "dot".  I'd like to see commits as circles, trees as triangles,
> blobs as rectangles, and have arrows linking these objects showing how
> they reference each other in the Git DAG.  For small repositories this
> may be a useful way to visualize how Git objects work.
> 
> I could not find a pre-existing script to do this so I am considering
> writing one.  Is there a way to enumerate all the objects in the Git
> object store, and for each one figure out its type (commit, tree, or
> blob) and obtain a list of the objects it references?  If not, is
> there a way to do this for a single object at a time?  (I can then
> simply recurse through the whole structure.)
> 

If you don't care about loose (unreferenced) objects then it's enough to
walk through all refs (branches, tags) and, for each ref, look at parent
and tree references (using git cat-file) and recurse.

If you don't care about the sha1 of commits you might even want to
(ab)use git-fast-export for that!

Michael