[Python-Dev] Mercurial migration: progress report (PEP 385)

[Brett Cannon]

On Fri, Jul 3, 2009 at 14:52, "Martin v. Löwis" <martin at v.loewis.de> wrote:

> > We could add another value in the tuple that specifies the VCS:
> > ('CPython', 'branches/release25-maint', '61464', 'svn'). I agree that
> > VCSs are not universally the same, but the concept of a revision is
> > universal.
>
> Actually, I think that's not the case. For bzr, the usual way of
> identifying a revision is by revision number, which, however, is not
> unique within a project, as each branch will use contiguous integers
> for numbers. There are also unique identifications - so a bzr revision
> has actually two numbers.
>
> More general, in a DVCS, it is not possible to access the revision being
> referred to by such a tuple. For sys.subversion, if [0]=='CPython', then
> you could go to svn.python.org. For a DVCS, the revision being
> identified may not be publically available, or may not live on a host
> that you can infer from your proposed sys.revision.
>
> For cloned branches, I wonder how sys.revision[1] would be computed.


So are you saying we should drop the idea of a revision value altogether, or
just embrace the differences and add a sys.mercurial attribute?

-Brett
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