Re: xdelta files for security patches

From: Peter Pentchev (roam_at_ringlet.net)
Date: 05/14/03

  • Next message: Colin Percival: "Re: xdelta files for security patches" 
    Date: Wed, 14 May 2003 12:06:29 +0300
To: Colin Percival <colin.percival@wadham.ox.ac.uk>

    On Wed, May 14, 2003 at 09:07:24AM +0100, Colin Percival wrote:
    > At 00:35 13/05/2003 +0100, I wrote:
    > > Using some form of binary diffs is on my todo list for FreeBSD Update
    > >(security/freebsd-update), but it's not a matter of critical
    > >importance. Right now updating from 4.7-RELEASE to the latest binaries
    > >takes around 30 MB, depending upon which install set you chose (nocrypt,
    > >crypt, kerberos4, kerberos5); good binary diffs would probably reduce
    > >this to around 5 MB.
    > > That said, I'm not sure if I would choose xdelta.
    >
    > Of course, when I wrote this, I had no idea that I was about to write a
    > binary diff/patch utility in 12 hours. In doing so, I've lost quite a bit
    > of respect for xdelta; ok, my code is about five times slower and has a
    > larger memory footprint, but it produces diffs 35% smaller and weighs in at
    > a massive 281 lines (in contrast to the thousands of lines of code in
    > xdelta).
    > I'll be adding this into FreeBSD Update in the near future. If anyone
    > wants the code for other purposes, feel free to contact me.

    When I read this thread yesterday, I was going to suggest taking a look
    at the rsync code. Still, it sounds like your code is much simpler than
    the rsync algorithm described at http://rsync.samba.org/tech_report/.
    This is probably a good thing :)

    G'luck,
    Peter 

    -- 
Peter Pentchev	roam@ringlet.net    roam@sbnd.net    roam@FreeBSD.org
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    • Re: xdelta files for security patches
      ... > Using some form of binary diffs is on my todo list for FreeBSD Update ... Right now updating from 4.7-RELEASE to the latest binaries ... I'm not sure if I would choose xdelta. ... I'll be adding this into FreeBSD Update in the near future. ...
      (FreeBSD-Security)
    • Re: xdelta files for security patches
      ... >delivering binary patches for security updates? ... Using some form of binary diffs is on my todo list for FreeBSD Update ... crypt, kerberos4, kerberos5); good binary diffs would probably reduce this ... I'm not sure if I would choose xdelta. ...
      (FreeBSD-Security)