preinst is in python-foolscap 0.6.4-2.
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 | #!/bin/sh
set -e
# there are no guarantees on unpack order, so when the pyshared egg
# folder is extracted before the symlinks in /usr/lib/.../dist-packages
# the upgrade will fail due to policy 6.6.4 when there are more than
# one supported python version as it will try to overwrite a directory
# after following the symlink
# => remove egg symlink installed by 0.6.1-1 before unpacking
if [ "$1" = upgrade ] && dpkg --compare-versions "$2" lt "0.6.1-4"; then
for f in /usr/lib/python2.*; do
# if egg is a link and not pointing to a directory
if [ -L "$f/dist-packages/foolscap-0.6.1.egg-info" ] &&
[ -f "$f/dist-packages/foolscap-0.6.1.egg-info" ]; then
rm -f "$f/dist-packages/foolscap-0.6.1.egg-info";
fi
done
fi
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