Package: libopensync0-dbg,libopensync1exp6-dbg
Version: libopensync0-dbg/0.22-4+b1
Version: libopensync1exp6-dbg/0.38-2
Severity: serious
User: trei...@debian.org
Usertags: edos-file-overwrite

Date: 2010-01-24
Architecture: amd64
Distribution: sid

Hi,

automatic installation tests of packages that share a file and at the
same time do not conflict by their package dependency relationships has
detected the following problem:


WARNING: The following packages cannot be authenticated!
  libpcre3 libxml2 libglib2.0-0 libopensync0 libxslt1.1 libopensync1exp6
  libopensync0-dbg libopensync1exp6-dbg
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5408175
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5407760
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5408177
Authentication warning overridden.
Can not write log, openpty() failed (/dev/pts not mounted?)
Selecting previously deselected package libpcre3.
(Reading database ... 12276 files and directories currently installed.)
Unpacking libpcre3 (from .../libpcre3_7.8-3_amd64.deb) ...
Selecting previously deselected package libxml2.
Unpacking libxml2 (from .../libxml2_2.7.6.dfsg-2_amd64.deb) ...
Selecting previously deselected package libglib2.0-0.
Unpacking libglib2.0-0 (from .../libglib2.0-0_2.22.4-1_amd64.deb) ...
Selecting previously deselected package libopensync0.
Unpacking libopensync0 (from .../libopensync0_0.22-4+b1_amd64.deb) ...
Selecting previously deselected package libxslt1.1.
Unpacking libxslt1.1 (from .../libxslt1.1_1.1.26-1_amd64.deb) ...
Selecting previously deselected package libopensync1exp6.
Unpacking libopensync1exp6 (from .../libopensync1exp6_0.38-2_amd64.deb) ...
Selecting previously deselected package libopensync0-dbg.
Unpacking libopensync0-dbg (from .../libopensync0-dbg_0.22-4+b1_amd64.deb) ...
Selecting previously deselected package libopensync1exp6-dbg.
Unpacking libopensync1exp6-dbg (from .../libopensync1exp6-dbg_0.38-2_amd64.deb) 
...
dpkg: error processing 
/var/cache/apt/archives/libopensync1exp6-dbg_0.38-2_amd64.deb (--unpack):
 trying to overwrite 
'/usr/lib/debug/usr/lib/python2.5/site-packages/_opensync.so', which is also in 
package libopensync0-dbg 0:0.22-4+b1
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Processing triggers for man-db ...
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5408175
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5407760
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5408177
Errors were encountered while processing:
 /var/cache/apt/archives/libopensync1exp6-dbg_0.38-2_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)


This is a serious bug as it makes installation fail, and violates
sections 7.6.1 and 10.1 of the policy. An optimal solution would
consist in only one of the packages installing that file, and renaming
or removing the file in the other package. Depending on the
circumstances you might also consider Replace relations or file
diversions. If the conflicting situation cannot be resolved then, as a
last resort, the two packages have to declare a mutual
Conflict. Please take into account that Replaces, Conflicts and
diversions should only be used when packages provide different
implementations for the same functionality.

Here is a list of files that are known to be shared by both packages
(according to the Contents file for sid/amd64, which may be
slightly out of sync):

  /usr/lib/debug/usr/bin/osyncbinary
  /usr/lib/debug/usr/bin/osyncdump
  /usr/lib/debug/usr/bin/osyncplugin
  /usr/lib/debug/usr/lib/python2.5/site-packages/_opensync.so

This bug is assigned to both packages. If you, the maintainers of
the two packages in question, have agreed on which of the packages will
resolve the problem please reassign the bug to that package.

-Ralf.

PS: for more information about the detection of file overwrite errors
of this kind see http://edos.debian.net/file-overwrites/.



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