[PATCH] convert: record the source revision in the changelog

[Alexis S. L. Carvalho]

Thus spake Brendan Cully:
> On Friday, 13 July 2007 at 06:47, Alexis S. L. Carvalho wrote:
> > > +        if commit.branch:
> > > +            extra['branch'] = commit.branch
> > > +        if commit.rev:
> > > +            extra['source_revision'] = commit.rev
> > 
> > At the time transplant_source was added, we sort of agreed on
> > "<extensionprefix>_<field>".
> 
> ok. convert_revision?

Sounds fine.

> > - should we also save the name of the source SCM?
> 
> we could. In practice I expect that it's pretty easy to
> reconstruct. It'll probably be obvious from the revision number anyway
> (it is so far).

Things could get a bit murkier if/when we add e.g. a monotone converter,
since it (like git) also uses SHA-1s as the revision id.  But I don't
really think we'll have many repos with revisions coming from half a
dozen different SCMs, so this shouldn't matter too much...

Alexis