On Wed, Jan 23, 2013 at 8:34 PM, Nguyễn Thái Ngọc Duy <pclo...@gmail.com> wrote:
> add_submodule_odb() can be used to import objects from another
> repository temporarily. After this point we don't know which objects
> are ours, which are external. If we create an object that refers to an
> external object, next time git runs, it may find a hole in the object
> graph because the external repository may not be imported. The same
> goes for pointing a ref to an external SHA-1.
> To protect ourselves, once add_submodule_odb() is used:
>  - trees, tags and commits cannot be created
>  - refs cannot be updated

.. and soon after I pressed send, I realized I missed at least two
other places write should not be allowed:

 - index
 - reflog

But the general idea is probably more important than implementation
details at this stage.
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