Package: libtacacs+1-dev,docbook-to-man
Version: libtacacs+1-dev/4.0.4.19-6
Version: docbook-to-man/1:2.0.0-27
Severity: serious
User: trei...@debian.org
Usertags: edos-file-overwrite

Date: 2010-03-15
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!
  sgml-base xml-core sgml-data docbook libsp1c2 sp docbook-to-man libtacacs+1
  libtacacs+1-dev
W: cowdancer: unsupported operation flock, read-only open and 
fchown/fchmod/flock are not supported: tried openning dev:inode of 2055:5408506
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 2055:5406756
Authentication warning overridden.
Can not write log, openpty() failed (/dev/pts not mounted?)
Selecting previously deselected package sgml-base.
(Reading database ... 12194 files and directories currently installed.)
Unpacking sgml-base (from .../sgml-base_1.26_all.deb) ...
Selecting previously deselected package xml-core.
Unpacking xml-core (from .../archives/xml-core_0.13_all.deb) ...
Selecting previously deselected package sgml-data.
Unpacking sgml-data (from .../sgml-data_2.0.4_all.deb) ...
Selecting previously deselected package docbook.
Unpacking docbook (from .../archives/docbook_4.5-4_all.deb) ...
Selecting previously deselected package libsp1c2.
Unpacking libsp1c2 (from .../libsp1c2_1.3.4-1.2.1-47_amd64.deb) ...
Selecting previously deselected package sp.
Unpacking sp (from .../sp_1.3.4-1.2.1-47_amd64.deb) ...
Selecting previously deselected package docbook-to-man.
Unpacking docbook-to-man (from .../docbook-to-man_1%3a2.0.0-27_amd64.deb) ...
Selecting previously deselected package libtacacs+1.
Unpacking libtacacs+1 (from .../libtacacs+1_4.0.4.19-6_amd64.deb) ...
Selecting previously deselected package libtacacs+1-dev.
Unpacking libtacacs+1-dev (from .../libtacacs+1-dev_4.0.4.19-6_all.deb) ...
dpkg: error processing 
/var/cache/apt/archives/libtacacs+1-dev_4.0.4.19-6_all.deb (--unpack):
 trying to overwrite '/usr/share/man/man3/regexp.3.gz', which is also in 
package docbook-to-man 1:2.0.0-27
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 2055:5408506
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 2055:5406756
Errors were encountered while processing:
 /var/cache/apt/archives/libtacacs+1-dev_4.0.4.19-6_all.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/share/man/man3/regexp.3.gz

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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