[darcs-users] discussing 'darcs unpull --tag' and best practices for a production rollback

[David Roundy]

On Fri, Jan 07, 2005 at 03:41:04PM +0000, Mark Stosberg wrote:
> Hello,
> 
> I was just looking at the docs for 'darcs unpull' and noticed
> that '--tag' is not documented.
> 
> Here's what I figured out that it does (by trying it):
> 
>  It removes a single tag patch, based on the name given. 
>  
> Correct?

Right.

> A related question: 
> 
> What is the "best practice" for rolling back a production 'checkout' to
> a previous known-good version? 
> 
> I had hoped I could 'unpull' back to a previous tag, but it appears I
> can only unpull a tag at at time, which would be a pain. 
> 
> My particular case is for a running website, so I would like
> to maximize the time the production instance is unavailable.
> 
> Perhaps I'll need to prepare a second repo and then quickly switch them:
> 
>  mv production production_old; mv production_new production;

That's what I'd do.  get --to-tag should make getting the older version
pretty painless.

We could add a --to-tag or --from-tag flag to unpull (probably
--from-tag/--from-patch), since this is a pretty common complaint, that it
takes ages to unpull back to an older version.
-- 
David Roundy
http://www.darcs.net