Re: [PATCH 0/8] introduce no-overlay and cached mode in git checkout

On Mon, Dec 10, 2018 at 6:18 PM Elijah Newren [off-list ref] wrote:

quoted

The final step in the series is to actually make use of this in 'git
stash', which simplifies the code there a bit.  I am however happy to
hold off on this step until the stash-in-C series is merged, so we
don't delay that further.

In addition to the no-overlay mode, we also add a --cached mode, which
works only on the index, thus similar to 'git reset <tree-ish> -- <pathspec>'.

If you're adding a --cached mode to make it only work on the index,
should there be a similar mode to allow it to only work on the working
tree?  (I'm not as concerned with that here, but I really think the
new restore-files command by default should only operate on the
working tree, and then have options to affect the index either in
addition or instead of the working tree.)

In the context of restore-files, --target=<worktree|index|both> is a
very good candidate because "restore-files --from=foo --target=index"
is almost like saying "restore files in the index from "foo"". For
checkout, probably not as good. But then we can have different option
names for the two commands. So if "git checkout" is going to never
have "update worktree only" mode, then --cached is a still good way to
go.
-- 
Duy