Help needed with libpaperg_1.0.3-10

[Marco Pistore <pistore@DI.Unipi.IT>]

Hi,

a pair of days ago i have uploaded a new version of libpaper and
libpaperg (version 1.0.3-10), to close a release critical bug:
in the preinst of libpaperg i have added two diversions, since
both libpaper and libpaperg contain the files
/usr/sbin/paperconfig and /usr/bin/paperconf.

Unfortunately, something is not working and i have received three bug
reports: there are problems when upgrading from libpaperg_1.0.3-9
to libpaperg_1.0.3-10: this is the more interesting (bug#23644):

> Package: libpaperg
> Version: 1.0.3-9
>
> Preparing to replace libpaperg 1.0.3-9 (using libpaperg_1.0.3-10.deb) ...
> Adding `diversion of /usr/bin/paperconf to /usr/bin/paperconf.libc5 by
> libpaperg'
> Adding `diversion of /usr/sbin/paperconfig to
> /usr/sbin/paperconfig.libc5 by libpaperg'
> Unpacking replacement libpaperg ...
> dpkg: error processing libpaperg_1.0.3-10.deb (--unpack):
>  trying to overwrite `/usr/bin/paperconf', which is the diverted version
> of `¼Z¨^ɸ×' (package:libpaperg)
> Errors were encountered while processing:
>  libpaperg_1.0.3-10.deb
> E: Sub-process returned an error code

Please notice the strange chars in the error message: i really do not know
how this can be my fault!

Moreover, I have tried to reproduce the bug, with no results: all works
correctly on my machine.

So, i really need your help with this bug: i am appending the preint
script for libpaperg_1.0.3.10 (that introduces the diversions).

Thank you,

Marco

------------------------ libpaperg.preinst ---------------------------
#! /bin/sh

set -e

FIRST_VERSION_WITH_DIVERT="1.0.3-10"

if [ "$1" = "install" ]; then
    dpkg-divert --package libpaperg --add --rename \
	--divert /usr/bin/paperconf.libc5 /usr/bin/paperconf
    dpkg-divert --package libpaperg --add --rename \
	--divert /usr/sbin/paperconfig.libc5 /usr/sbin/paperconfig
fi

if [ "$1" = "upgrade" ] && 
  /usr/bin/dpkg --compare-versions $2 lt $FIRST_VERSION_WITH_DIVERT ; then
    dpkg-divert --package libpaperg --add \
	--divert /usr/bin/paperconf.libc5 /usr/bin/paperconf
    dpkg-divert --package libpaperg --add  \
	--divert /usr/sbin/paperconfig.libc5 /usr/sbin/paperconfig
fi

exit 0

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