[Haskell-cafe] darcs to mercurial migration

[Nicolas Pouillard]

On Fri, 7 May 2010 08:42:31 -0700, Jason Dagit <dagit at codersbase.com> wrote:
> On Fri, May 7, 2010 at 2:29 AM, Nicolas Pouillard <
> nicolas.pouillard at gmail.com> wrote:
> 
> > On Thu, 06 May 2010 01:08:08 +0200, Günther Schmidt <gue.schmidt at web.de>
> > wrote:
> > > Hello,
> > >
> > > I'm switching from darcs to mercurial with some of my projects.
> > >
> > > I'd like to retain as much of the history as possible, what tools are
> > > there available for this?
> >
> > I recommend you darcs-fast-export and then use the/a mercurial fast-import.
> >
> > http://vmiklos.hu/project/darcs-fast-export/
> >
> 
> Does this tool use libdarcs to read the darcs repository data and metadata?

No I don't think so.

> I see the claim that it is correct on the page you linked to:
> 
> > Correct
> >
> > darcs-fast-export produces correct results in any extreme cases. It has
> > been tested with a collection of large darcs repos (called big-zoo<http://code.haskell.org/darcs/big-zoo/>).
> > And several testcases under the t/ directory.
> >
> The correctness argument is solely based on testing of the conversion on
> repositories?  If so, how can it remain correct when darcs changes the
> format or semantics of its data?
> 
> Tailor on the other hand, invokes the various vcs directly and transfers the
> diffs between the repositories.  This seems inherently safer to me.

Sure if tailor fits your needs, then perfect. But I find it slow and buggy,
in particular be sure of checking that you have the same result in the end.
Often it is not the case...

-- 
Nicolas Pouillard
http://nicolaspouillard.fr