[webkit-dev] [webkit-changes] [52439] trunk/WebCore

Maciej Stachowiak mjs at apple.com
Tue Dec 22 20:01:22 PST 2009

On Dec 21, 2009, at 12:22 PM, Eric Seidel wrote:

> I'm happy to move the commit-queue to use an SVN checkout instead if
> that would be a desired change. :)

Yes please.

  - Maciej

> -eric
> On Mon, Dec 21, 2009 at 2:20 PM, David Kilzer <ddkilzer at webkit.org>  
> wrote:
>> If you want to make sure you're not going to lose history, you  
>> should use svn directly.  The svn-apply script already knows all  
>> the magic to do the right thing...if you used svn-create-patch to  
>> create the patch *and* if you're committing to an svn repository.
>> The "git svn dcommit" command (especially in newer versions of git)  
>> will try to relate source files that are moved or copied, but it  
>> only uses a heuristic when committing.  Using the "--dry-run"  
>> switch may provide some insight into whether git will show copied/ 
>> moved files or not, but I've never tested it to make sure how  
>> accurate it is compared to the actual commit.
>> If the commit-queue is using a git repository, it will only work as  
>> well as git's heuristic does.
>> Setting "[diff] renames = copies" in ~/.gitconfig or in your .git/ 
>> config file for each project will make git diff try to do rename  
>> detection when creating a patch.  (You may also use "--find-copies- 
>> harder" or "--find-copies-harder -C" switches on the command  
>> line.)  This will provide hints in the git diff about file renames,  
>> but it still only uses a heuristic, and svn-apply currently doesn't  
>> know about these hints:
>> Bug 32834: svn-apply should handle git patches with similarity  
>> index, rename and copy directives
>> https://bugs.webkit.org/show_bug.cgi?id=32834
>> Also note that --find-copies-harder doesn't work on small files  
>> (files under a certain number of lines), although I don't know what  
>> that threshold is off the top of my head.
>> I've also seen git think that a new header file (whose license text  
>> is larger than the header code itself) is actually a copy of  
>> another similarly short header file when doing large merges.
>> Again, you should use svn if you want to ensure file history.
>> Dave
>> On Mon, December 21, 2009 10:19:03 AM, Eric Seidel wrote:
>>> If such git magic exists, it would be possible to teach svn-apply  
>>> to use it.
>>> -eric
>>> On Mon, Dec 21, 2009 at 12:05 PM, Darin Adler wrote:
>>>> On Dec 21, 2009, at 8:31 AM, Pavel Feldman wrote:
>>>>> Sorry about that - it was git's decision.
>>>> It that’s the case, then please consider not using git for this  
>>>> type of change
>>> in the future. We don’t want to unnecessarily lose repository  
>>> history when such
>>> changes occur.
>>>> If a git expert can show you how to do such changes with git  
>>>> while preserving
>>> the Subversion history, then that gives you another option.
>>>>    -- Darin
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