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Message from discussion Bug#670494: fixing this
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Andreas Beckmann  
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 More options May 10 2012, 9:50 pm
Newsgroups: linux.debian.bugs.dist
From: Andreas Beckmann <deb...@abeckmann.de>
Date: Fri, 11 May 2012 03:50:01 +0200
Local: Thurs, May 10 2012 9:50 pm
Subject: Bug#670494: fixing this
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Hi Norbert,

[don't forget to Cc: the -submitter]

On Friday, 11. May 2012 01:21:10 Norbert Preining wrote:

> I have made the following additions to the preinst of ptex-bin:

preinst is probably too early to remove the diversions (the old package is
still installed so both orig_file (the version from ptex-bin) and
diverted_file (from whatever package) could exist in the file system.
But postinst should be fine to do the cleanup.

>   if dpkg --compare-versions "$2" le "2011.20120509-1" ; then

use 'le-nl' unless you want to run this on initial install ($2=""), too

>     # these will give a warning message for installations who
>     # did install ptex-bin only from 2011 and not the old one

For noiseless removal of diversions you could use something like:

Pre-Depends: dpkg (>= 1.15)
(plain Depends: would be sufficient if this gets into postinst only)

undivert()
{
  file_orig="$1"
  diverter="$(dpkg-divert --listpackage "$file_orig")"
  if [ -n "$diverter" ]; then
    file_diverted="$(dpkg-divert --truename "$file_orig")"
    dpkg-divert --remove --rename --package "$diverter" \
                --divert "$file_diverted" "$file_orig"
  fi

}

undivert /usr/bin/pltotf
undivert /usr/share/man/man1/pltotf.1.gz
undivert /usr/bin/tftopl
undivert /usr/share/man/man1/tftopl.1.gz

(untested, but in glx-diversions.postinst I used something much more complex
to cleanup+migrate some diversions)

> Please let me know if you think this appropriate or if we need anything
> more?

You only need to remove the old diversions, there are no new diversions to be
created?

Andreas

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