Re: efficient way to filter several branches with common history?

[Johannes Sixt <J.Sixt@eudaptics.com>]

Steffen Prohaska wrote:
> 
> Is there an efficient way to filter several branches at once
> through git-filter-branch? Often several branches have a lot
> of common history. Therefore, I suspect it would be much more
> efficient to filter them with one call to git-filter-branch.
> For example how can I efficiently filter all origin/* branches
> to filtered/* branches?

That feature is not yet implemented.

In the meantime do it this way:

Make an octopus merge of the branches onto a new branch. (If you have
more than a dozen or so, you better make a hierarchy of octopusses.) You
don't need to resolve conflicts (you are not interested in the merge
result), or use -s ours to avoid them in the first place.
Then filter that new branch.
Then create new refs at the rewritten commits:

   $ git update-ref refs/filtered/b1 $id-of-rewritten-origin/b1
   $ ...

Use gitk to find the $ids-of-rewritten-origin/*

-- Hannes