Re: Opera release Git-splitter, a sub-modularizing tool for Git

[Michael J Gruber <git@drmicha.warpmail.net>]

Yngve Nysaeter Pettersen venit, vidit, dixit 21.12.2012 21:13:
> On Fri, 21 Dec 2012 16:49:21 +0100, Matthieu Moy  
> <Matthieu.Moy@grenoble-inp.fr> wrote:
> 
>> "Yngve Nysaeter Pettersen" <yngve@opera.com> writes:
>>
>>> The split command will create a new repository for all files foo in a
>>> folder (path/foo) and their commit history.
>>>
>>> The replant command reverses that process, re-adding the path prefix
>>> for each file. It may be possible to extend that process into one that
>>> automatically reintegrates the new commits in the original history,
>>> but I never had time to complete that work.
>>>
>>> I did originally add the "replant" functionality into my version of
>>> the git-subtree script, but given the number of commits in the
>>> original repository, git-subtree turned out to be inefficient, due to
>>> the use of temporary files (tens of thousands of files IIRC).
>>>
>>> Those problems led to my development of git-splitter in Python
>>> (bypassing the problem of temporary files), but just including the
>>> functionality I needed, join was not one of those functions.
>>
>> That still doesn't answer the question: why did you need to write a new
>> tool instead of extending git-subtree?
> 
> The primary problem with git-subtree was that I ended up with a temporary  
> file directory containing 100+K files, which I tracked back to being used  
> to manage the commit-to-tree mapping. On Windows, at least, that literally  
> slowed down the process to a crawl.
> 
>> If one doesn't use "replant", is your tool different from git-subtree?
> 
> No, it is not different. However, my tool will use RAM, not diskspace to  
> manage information.

That is some valuable input. It can help improve git-subtree for Windows
users, or replace it by something else.

Michael