Some Debian package upgrades are corrupting rsync "quick check" backups

[Mattia Rizzolo]

On Mon, Jan 30, 2017 at 02:01:10PM +0200, Henrik Ahlgren wrote:
> On Sat, 2017-01-28 at 23:00 +0100, Lupe Christoph wrote:
> > On Saturday, 2017-01-28 at 14:51:19 +0000, Holger Levsen wrote:
> > > On Sat, Jan 28, 2017 at 03:04:56PM +0100, Daniel Reichelt wrote:
> > > > I highly suspect this stems from packages' rules files supporting
> > > > reproducible builds.
> > 
> > > I rather think this is due to binNMUs not modifying debian/changelog…
> > > (in the source package while it's modified in the binary packages…)
> > 
> > This is completely counter intuitive. I'm using rsnapshot to backup a
> > few private machines. I will have to set up separate rsnapshots for
> > those parts of the backup that suffer from this <expletive>, to avoid
> > bogging down the data parts by unnecessary checksum calculations.
> > 
> > This problem may affect many other backups too. Did anybody research
> > backup programs before this <expletive> was introduced to Debian?
> 
> Would reproducible-builds at lists.alioth.debian.org be the correct mailing
> list to discuss this?

Not really, because that has been done in sbuild since long before the
reproducible builds project became active: 0.62.2-1, Tue, 05 Apr 2011:
    - Improve binNMU handling to permit binNMUs for multiarch packages
      (Closes: #620112).  Currently, binary NMUs use the current date
      in the new changelog entry, but co-installable packages require
      an identical changelog.  To avoid this, take the date from the
      previous changelog entry to ensure the same date for all binNMUs.
      Thanks to Anders Kaseorg for this patch.

And, incidentally, this has been kind of reverted in 0.73.0-1 (Sat, 24
Dec 2016) after a fairly long and annoying discussion in debian-devel:
  * For binNMUs, instead of copying the timestamp of the last changelog entry,
    generate a new one (closes: #843773)


-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
more about me:  https://mapreri.org                             : :'  :
Launchpad user: https://launchpad.net/~mapreri                  `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://lists.alioth.debian.org/pipermail/reproducible-builds/attachments/20170130/d32b6aac/attachment.sig>