Re: git-svn pulling down duplicate revisions

[Kevin Ballard <kevin@sb.org>]

On Jun 2, 2008, at 3:42 AM, Eric Wong wrote:

> Kevin Ballard <kevin@sb.org> wrote:
>> On Jun 1, 2008, at 10:40 PM, Eric Wong wrote:
>>
>>> Kevin Ballard <kevin@sb.org> wrote:
>>>> On Jun 1, 2008, at 10:00 PM, Eric Wong wrote:
>>>>
>>>>> Kevin Ballard <kevin@sb.org> wrote:
>>>>>> I started a git-svn clone on a large svn repository, and I  
>>>>>> noticed
>>>>>> that for various branches, it kept pulling down the exact same
>>>>>> revisions (starting at r1). In other words, if I had 4 branches
>>>>>> that
>>>>>> shared common history, their common history all got pulled down 4
>>>>>> times. I double-checked, and the created commit objects were
>>>>>> identical.
>>>>>>
>>>>>> Why was git-svn pulling down the same revisions over and over,  
>>>>>> when
>>>>>> it
>>>>>> already knows it has a commit object for those revisions?
>>>>>
>>>>> Can you give me an example if a repository and command-line you  
>>>>> used
>>>>> that does this?   Did you use 'git svn clone -s' or did you  
>>>>> manually
>>>>> specify the branch locations in the repo?
>>>>>
>>>>> It could even be a lack of read permissions to the repository root
>>>>> that would cause things like this.
>>>>
>>>> The repository is, unfortunately, a private repo so I can't share  
>>>> it.
>>>> I used `git svn clone -s` to clone it. I have the SVN perl bindings
>>>> v1.4.4 (according to git svn --version).
>>>>
>>>> I definitely have read permissions to the repo root. If I specify  
>>>> to
>>>> only fetch -r 12000:HEAD (there's 14000-odd revisions), it doesn't
>>>> pull down any duplicates, but when I let it start from the root, it
>>>> pulls down hundreds of duplicates for multiple branches.
>>>
>>> Can you at least send me the 'svn log -v' output for that repo?
>>> Feel free to leave out the actual log messages and munge the path
>>> names if you can't expose that information.
>>
>> I'll have to do it tomorrow when I'm at the office. How much log info
>> do you need? I can let it run until I see duplicate revisions (it's
>> pretty obvious, it starts over again from r1).
>
> I'll need the revisions where branches were created from
> the common ancestor (presumably trunk) and some revisions
> before it.
>
> For debugging problems with restricted repositories, it may be worth  
> it
> to create a repository skeleton cloning tool that just reads the  
> output
> of 'svn log --xml -v' and recreates a new SVN repository with:
>
>  * all log messages stripped
>
>  * all new files are created with just a random string in them (to
>    throw off rename detection on the git side)
>    (except symlinks, see below)
>
>  * all path components tokenized and each token replaced with
>    a dictionary value.  Something like:
>
>    @tmp = map { $tok{$_} ||= ++$i; $tok{$_} } split(/\//, $old_path);
>    $new_path = join('/', @tmp);
>
>    This way all copy history can be preserved
>
>  * all modified files will just get a random byte appended to them
>
>  * all committer names replaced with a dictionary value (similar to
>    what is done to path components).

Isn't there a script somewhere that's supposed to do this? Do you know  
where it is?

Incidentally, I just checked and when I start the git-svn clone, it  
starts pulling down revisions for the branch 'css_refactor@1559' (odd  
branch name, but it claimed to find multiple branch points for this  
'css_refactor' branch). My guess is when it starts working on the next  
branch, it doesn't view it as related to css_refactor and starts  
pulling down the revisions again even though those revisions actually  
belonged to trunk.

-Kevin

-- 
Kevin Ballard
http://kevin.sb.org
kevin@sb.org
http://www.tildesoft.com