Finishing rebuild of rpms, from deltarpms
jdieter at lesbg.com
Sat Apr 16 05:58:04 UTC 2011
On Fri, 2011-04-15 at 22:33 -0700, JD wrote:
> On 04/15/2011 09:04 PM, Andre Robatino wrote:
> > http://cedarandthistle.wordpress.com/2009/11/06/on-binary-delta-algorithms/
> Read the article and parts of the thesis.
> So, the final version of the algorithm
> still remains with the University of Oxford??
> I downloaded the bsdiff srpm for fc15 and built it.
> I then used it to diff
> -rwxr-xr-x 1 root root 3699072 Feb 6 23:09
> -rwxr-xr-x 1 root root 3702144 Mar 31 15:26
> and the resulting patch
> -rw-r--r-- 1 root root 3554921 Apr 15 22:17
> So, you can see that the patch is almost the same size as the files diffed.
> Obviously, version 4.3-8 does not contain the unpublished optimizations
> that Colin Percival mentions in his thesis.
A couple of things:
1. vmlinuz is compressed and it's essentially useless to delta
compressed files without uncompressing them first.
2. We use the program deltarpm to make deltas between rpms.
Deltarpm uses a modified bsdiff algorithm as well as the add
block enhancements mentioned in my blog post.
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