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TODO: implement below

git-annex does use a lot of symlinks. Specicially, relative symlinks,
that are checked into git. To allow you to move those around without
annoyance, git-annex can run as a post-commit hook. This way, you can `git mv`
a symlink to an annexed file, and as soon as you commit, it will be fixed
up.

`git annex init` tries to set up a post-commit hook that is itself a symlink
back to git-annex. If you want to have your own shell script in the post-commit
hook, just make it call `git annex` with no parameters. git-annex will detect
when it's run from a git hook and do the necessary fixups.