preinst is in python-cairo 1.8.8-2.2.
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 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh -e
PYCENTRAL=/usr/bin/pycentral
case "$1" in
upgrade)
if dpkg --compare-versions "$2" lt 1.8.4-2; then
if [ -x $PYCENTRAL ]; then
# explicitly remove old python-central files
pycentral pkgremove python-cairo
fi
# be really really sure about it, in case we update
# from 1.8.4-1
for pyversion in 2.4 2.5; do
if [ -d /usr/lib/python$pyversion/site-packages/cairo/ ]; then
rm -f /usr/lib/python$pyversion/site-packages/cairo/__init__.py*
rmdir --ignore-fail-on-non-empty /usr/lib/python$pyversion/site-packages/cairo
fi
done
fi
;;
*)
;;
esac
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