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Re: [PATCH 2/2] refs_resolve_ref_unsafe: handle d/f conflicts for writes

On 10/06/2017 07:16 PM, Jeff King wrote:
> On Fri, Oct 06, 2017 at 07:09:10PM +0200, Michael Haggerty wrote:
>> I do have one twinge of uneasiness at a deeper level, that I haven't had
>> time to check...
>> Does this patch make it easier to *set* HEAD to an unborn branch that
>> d/f conflicts with an existing reference? If so, that might be a
>> slightly worse UI for users. I'd rather learn about such a problem when
>> setting HEAD (when I am thinking about the new branch name and am in the
>> frame of mind to solve the problem) rather than later, when I try to
>> commit to the new branch.
> Good question. The answer is no, it's allowed both before and after my
> patch. At least via git-symbolic-ref.
> I agree it would be nice to know earlier for such a case. For
> symbolic-ref, we probably should allow it, because it's plumbing that
> may be used for tricky things. For things like "checkout -b", you'd
> generally get a timely warning as we try to create the ref.
> The odd man out is "checkout --orphan", which leaves the branch unborn.
> It might be nice if it did a manual check that the ref is available (and
> also that it's syntactically acceptable, though I think we may do that
> already).
> But all of that is orthogonal to this fix, I think.

Thanks for checking. Yes, I totally agree that this is orthogonal.