On Thu, Nov 29, 2012 at 11:13 AM, Junio C Hamano <gits...@pobox.com> wrote:
> [...]These
> two commands, "reset" and "checkout", share that the source we grab
> the blobs out of only need to be a tree and does not have to be a
> commit, and the only difference between them is where the blobs we
> grabbed out of that tree go, either only to the index or to both the
> index and the working tree.

Slightly off topic, but another difference (or somehow another aspect
of the same difference?) that has tripped me up a few times is that
"git checkout $rev ." only affects added and modified files (in $rev
compared to HEAD), but "git reset $rev ." would also delete deleted
files from the index. I suppose this is also a partial answer to your
question in another message:

> What does it even mean, even when you are on an existing commit, to
> hard reset partially?
> Perhaps you looking for "git checkout $tree -- $path"?

A more direct answer would be that I would expect "git reset --hard
$rev -- ." to behave like "git reset --hard $rev", except that it
wouldn't update HEAD. It seems to me that that would be similar to how
"git reset $rev -- ." behaves like "git reset $rev", except that it
doesn't update HEAD. But reset and checkout with and without paths
still confuse me after years of using git, so I wouldn't be surprised
if I'm not making any sense.
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