Which VCSes have "uncommit"?

[Neil Martinsen-Burrell]

On 2009-11-05 09:41 , Daniel Carrera wrote:
> Does anyone know which distributed VCSes have an "uncommit" feature at
> least as powerful and at least as easy as the one from Bazaar? The only
> examples I know are Bazaar and Darcs ("darcs unrecord").
>
> I get the impression that Mercurial and Git can use "rebase" to achieve
> this, but that this is more complicated. So they would meet the "at
> least as powerful" criterion but not the "at least as easy" criterion.

As far as I know, every dVCS can do this operation because it is a 
simple operation on the DAG: change the tip pointer to point to the 
parent of the current revision.  This is in fact what ``bzr uncommit`` 
does.  If you want to get particularly explicit with this, you can 
uncommit as many revisions as you want using ``bzr pull . --overwrite -r 
-N`` (which I've had to do recently after accidentally pulling from 
trunk while in a release branch).  A bit of googling shows that 
equivalents are ``git reset --hard HEAD~N`` or ``hg rollback`` (for a 
single revision).

-Neil