Enumerating all objects in the Git object store

> 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.)

> Am 3/26/2010 16:31, schrieb Paul Richards:
> > 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.)
> 
> Use 'git rev-list --objects --all' to find all objects connected to all
> refs (use something else than --all if you want to). Do *not* look at the
> path that the tree and blob objects have attached - it is not authorative
> information.
> 
> Use 'git cat-file -t' to find the type.

> On Fri, 26 Mar 2010, Johannes Sixt wrote:
> > Use 'git rev-list --objects --all' to find all objects connected to all
> > refs (use something else than --all if you want to). Do *not* look at the
> > path that the tree and blob objects have attached - it is not authorative
> > information.
>
> Really??

> On Freitag, 26. März 2010, Nicolas Pitre wrote:
> > On Fri, 26 Mar 2010, Johannes Sixt wrote:
> > > Use 'git rev-list --objects --all' to find all objects connected to all
> > > refs (use something else than --all if you want to). Do *not* look at the
> > > path that the tree and blob objects have attached - it is not authorative
> > > information.
> >
> > Really??
> 
> Yes, really. Consider the same content at two differen paths. Now what? 
> rev-list will only ever list the object once.

> Am 3/26/2010 16:31, schrieb Paul Richards:
>> 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.)
>
> Use 'git rev-list --objects --all' to find all objects connected to all
> refs (use something else than --all if you want to). Do *not* look at the
> path that the tree and blob objects have attached - it is not authorative
> information.
>
> Use 'git cat-file -t' to find the type.
>
> Use 'git cat-file -p' to pretty-print the content of an object. Parse it
> depending on the type that you find.
>

> 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.)
>