Re: Git's database structure

On Tue, Sep 04, 2007 at 05:55:16PM +0200, Andreas Ericsson [off-list ref] wrote:

Each root tree can only ever belong to a single commit, unless you
intentionally force git to make completely empty commits. git
won't complain about this, so long as you don't make two in the
same second, because it relies more heavily on the DAG than on
developer sanity.

Actually, you don't need to be insane to have multiple commits pointing
at the same root tree. It is actually very easy:
- git clone
- do some stuff on your master branch and commit
- send your changes upstream
- upstream applies as is
- git pull

You now have everything merged, and the last commit on your master branch,
while being a different commit object due to its parenting, has the same
root tree as the tip of the remote branch.

Mike