preinst is in python-pyhsm 1.0.4f-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 | #! /bin/sh
set -e
# This was added by stdeb to workaround Debian #479852. In a nutshell,
# pycentral does not remove normally remove its symlinks on an
# upgrade. Since we're using python-support, however, those symlinks
# will be broken. This tells python-central to clean up any symlinks.
if [ -e /var/lib/dpkg/info/python-pyhsm.list ] && which pycentral >/dev/null 2>&1
then
pycentral pkgremove python-pyhsm
fi
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