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The checkout subcommand replaces the symlink that normally points at a
file's content, with a copy of the file. Once you've checked a file out,
you can edit it, and `git commit` it. On commit, git-annex will detect
if the file has been changed, and if it has, `add` its content to the
annex.
> Internally, this will need to store the original symlink to the file, in
> `.git/annex/checkedout/$filename`.
>
> * git-annex uncheckout moves that back
> * git-annex pre-commit hook checks each file being committed to see if
> it has a symlink there, and if so, removes the symlink and adds the new
> content to the annex.
>
> And it seems the file content should be copied, not moved or hard linked:
>
> * Makes sure other annexes can find it if transferring it from
> this annex.
> * Ensures it's always available for uncheckout.
> * Avoids the last copy of a file's content being lost when
> the checked out file is modified.
[[done]]
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