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

David Kilzer ddkilzer at webkit.org
Wed Dec 23 06:55:32 PST 2009

On Wed, December 23, 2009 at 4:34:06 AM, Evan Martin wrote:

> On Mon, Dec 21, 2009 at 12:20 PM, David Kilzer wrote:
> > 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:
> This sort of thing has been a persistent problem for Chrome as well.
> Since our code review tool and our trybot also rely on SVN-specific
> features (including stuff like revprops, as well as the way it handles
> new files and renames), we are already doing work in multiple places
> to extend these tools to either understand git-style diffs or produce
> SVN-style diffs from Git.
> See for example GetMungedDiff in:
> http://src.chromium.org/viewvc/chrome/trunk/tools/depot_tools/git-try?revision=34087&view=markup
> One option I've been considering is extending git-svn to include a
> "git svn diff" that produces an SVN-style patch.  That would "fix"
> this problem at the source, at the cost of needing to retrain everyone
> to use it when submitting WebKit patches.  :\

Upstreaming a solution in git-svn would be great!  Does current svn (1.6?) add hints to its patches for moved and copied files?  How about moved/copied and then modified files?  Does it handle binary file diffs?

WebKitTools/Scripts/svn-create-patch was originally created to work around these deficiencies in "plain" svn-diff, and handles all of the above cases (although the binary diffs aren't efficient by any stretch).


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