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

[Georg Brandl]

Martin v. Löwis schrieb:
>> 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.

At least you can tell that if the given hash is not present in the mainline
repo, the build contains something that doesn't come from python.org.

Georg

-- 
Thus spake the Lord: Thou shalt indent with four spaces. No more, no less.
Four shall be the number of spaces thou shalt indent, and the number of thy
indenting shall be four. Eight shalt thou not indent, nor either indent thou
two, excepting that thou then proceed to four. Tabs are right out.