Re: [TOY PATCH] filter-branch: add option --delete-unchanged

On Fri, Aug 8, 2008 at 11:10 PM, Thomas Rast [off-list ref] wrote:

With --delete-unchanged, we nuke refs whose targets did not change
during rewriting.  It is intended to be used along with
--subdirectory-filter to clean out old refs from before the first
commit to the filtered subdirectory.  (They would otherwise keep the
old history alive.)

Obviously this is a rather dangerous mode of operation.

Note the "sort -u" is required: Without it, --all includes
'origin/master' twice (from 'origin/master' and via 'origin/HEAD'),
and the second pass concludes it is unchanged and nukes the ref.

This is really useful, why isn't it merged?

Personally I use filter-branch to, duh, filter a branch, so I don't
want the commit objects that are not filtered, nor the refs to them.

-- 
Felipe Contreras