preinst is in denyhosts 2.10-2.
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 | #!/bin/sh
# preinst script for denyhosts
set -e
if dpkg --compare-versions "$2" lt 2.6-6.1 && [ -e /var/lib/dpkg/info/denyhosts.postrm ]
then
sed -e 's#rm -f /etc/logrotate.d/denyhosts##g' < /var/lib/dpkg/info/denyhosts.postrm > /var/lib/dpkg/info/denyhosts.postrm.changed && \
mv -f /var/lib/dpkg/info/denyhosts.postrm.changed /var/lib/dpkg/info/denyhosts.postrm
fi
exit 0
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