[Quilt-dev] Re: gendiff command

[Andreas Gruenbacher]

On Wed, 2003-10-22 at 01:34, Peter Braam wrote:
> Nope that's not what we want I think.
> 
> Let me one more time give the example.  Suppose we have a patch for 
> linux-2.4.20, p-2.4.20.patch and another one p-2.4.22.patch in two 
> series files.
> 
> A developer will change p-2.4.20.patch.   The "diff of the 2.4.20 diff" 
> is not so useful to the 2.4.22 developer, what is useful is:
> 
> diff between tree with series upto including p-2.4.20.patch applied 
> before and after the update to this patch.  That is a diff that is quite 
> likely to go into 2.4.22 without difficulties, to aid updating the 
> 2.4.22 patch.

My descripiton was not precise. You get an incremental diff, not a diff
of a diff.

You could store that diff in a file 1.diff. Then, 1.diff applied on top
of the old a.diff would get you to the new a.diff.