[Numpy-discussion] Moving away from svn ?
Sun Jan 6 05:10:11 CST 2008
Bill Baxter wrote:
> On Jan 6, 2008 6:38 PM, Robert Kern <firstname.lastname@example.org> wrote:
>> Bill Baxter wrote:
>>> This is a bit puzzling. I understand better merging isn't the only
>>> reason to choose DVCS, but the above page basically says that
>>> Mercurial just uses whatever external merge program it can find. So
>>> the file-level merging sounds like it must really be no different from
>>> other VCSs.
>>> So it is really just proper merging of directory renames and the like
>>> that make it superior?
>> No. If you'll pardon my repeating myself:
>> DVCSes need to keep track of more information in order to be
>> distributed. That information is extremely useful for managing merges properly.
>> Centralized systems could track this information, but they don't *need* to in
>> order to be functional, so they mostly haven't, yet.
>> For each revision, the DVCS knows what revisions it derives from. SVN does not
>> keep this information. SVN primarily just knows the text diffs from revision to
>> revision. In particular, if I have a long-lived branch, I am going to merge in
>> changes from the trunk while I'm working on it. When I go to merge the branch
>> back into the trunk, I need to know which trunk-revisions I've already merged
>> into the branch. SVN does not track this information. Tools like svnmerge.py
>> track some of this information at the expense of some added clumsiness.
> Ok. Sorry for not reading that closer. So what you're saying is that
> the magic is in the deciding of exactly which revisions of which files
> to run the merge program on?
That's the main idea.
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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