Re: [PATCH] checkout -f: do not leave untracked working tree files.

Junio C Hamano [off-list ref] writes:

Earlier we did not consider untracked working tree files
"precious", but we have always considered them fair game to
clobber.  These days, branch switching by read-tree is more
careful and tries to protect untracked working tree files.  This
caused the following workflow to stop working:

	git checkout one-branch-with-file-F
	git checkout -f another-without-file-F
	git pull . one-branch-with-file-F

Because the second checkout leaves F from the previous state as
untracked file in the working tree, the merge would fail, trying
to protect F from being clobbered.

This changes "git checkout -f" to remove working tree files that
are known to git in the switched-from state but do not exist in
the switched-to state, borrowing the same logic from "reset --hard".

I agree with this patch (without testing).

Another thing to take into account is that, for this particular
case/sequence, the untracked file-F is exactly the same as the one from
the pull, so you are not overwritting that file and it could succeed.

    Santi