preinst is in bzip2 1.0.6-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #!/bin/sh
set -eu
# If and only if we are uprading from a version lower than 0.9.5d-3,
# then we want to break the old /usr/share/doc/libbz2 symlink (which was
# pointing to libbz2).
if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" "<<" "0.9.5d-3"
then
if test -L /usr/share/doc/bzip2
then
rm -f /usr/share/doc/bzip2
fi
fi
# And we should never ever have a directory in /usr/doc/bzip2
if [ -d /usr/doc/bzip2 ] && [ ! -L /usr/doc/bzip2 ]
then
echo "Cleaning up left-over /usr/doc/bzip2."
rm -fr /usr/doc/bzip2
fi
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