Re: RCS, again: another removed functionality: undo last-checkin

[Dmitry Gutov]

On 09/23/2015 09:58 AM, Eli Zaretskii wrote:

> With such a difference in back-end implementation of a rollback, it
> would be appropriate to have a separate back-end method that produces
> the warning language.

I don't like that very much (sounds complex). Better to have two 
commands, and allow a backend to signal error in one of them.

> But then what will we do with back-ends where there's only one command
> for a rollback, and it works regardless of whether the the commit was
> published?

If the backend doesn't know when to signal an error, it won't. The RCS 
and CVS backend obviously won't do that.

A slight modification on that plan would be a new `revision-public' 
command which returns t if we're not supposed to modify or rollback that 
revision. Then the error would be raised not by vc-git, but by generic code.