bug#43464: 28.0.50; vc: Error calling vc-revert for repo root

[Dmitry Gutov]

On 18.09.2020 18:45, Andrii Kolomoiets wrote:
> Dmitry Gutov <dgutov@yandex.ru> writes:
>
> > On 18.09.2020 12:30, Andrii Kolomoiets wrote:
> > > Calling `vc-git-revert` or `vc-hg-revert` directly with repo root or any
> > > directory within repo works fine.
> >
> > True. That's how Git and Hg work anyway.
> >
> > I'm not saying the current situation is ideal, but we'd either have to
> > give up any attempt to revert a directory (with a more appropriate
> > message), or somehow differentiate between different backends where it
> > would or wouldn't work.
>
> BTW vc-revert is also works fine in Git repo when point is on
> subdirectory.  So for the vc-git only reverting repo root is not
> working.

That's an interesting observation.

> Please see attached patch which make it possible for vc-hg to revert
> directory.

Could you explain both changes in that patch?

And also: how does it change, or not change, the behavior of vc-revert 
in backends that are not Git or Hg?