Re: [PATCH] builtin-apply: check for empty files when detecting creation patch

> Look at CVS-generated patches, or SVN for that matter. The diffs look like 
> this:
>
> 	Index: file
> 	===================================================================
> 	--- file (revision 0)
> 	+++ file (working copy)
> 	@@ -0,0 +1 @@
> 	+test
>
> and there is no /dev/null there.
>
> The thing is, git-apply is careful, and it's very much careful with 
> respect to *knowing* that there are lots of different versions of "diff" 
> floating around, and lots of different SCM systems that generate odd diff 
> headers. We should absolutely NOT start expecting that diffs are only 
> generated with GNU diff.
>
> So non-/dev/null'ness means absolutely nothing. It means "don't know", and 
> we should leave is_new and is_delete as -1.