On Fri, 22 Jul 2005, A Large Angry SCM wrote:
> To do it without the history rewrite, create an alternate_history 
> directory under .git with it's own objects tree. And populate that 
> object tree with "alternative" content for the objects in the normal 
> trees. Then teach the things the lookup/read objects to look there first 
> and to _not_ care about invalid SHAs. Of course, if you do this, you 
> will never be able to trust your repository.

You can do it much more nicely if you want.

Just teach "parse_commit()" to look at a ".git/fake_parents" file, and 
insert fake extra parents for commits that way - you can graft any tree on 
top of any other tree that way, and it's probably a nice idea for testing 
things out.

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