/usr/share/debhelper/autoscripts/preinst-dzextension is in zope-debhelper 0.3.15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | if which dzhandle >/dev/null; then
case "$1" in install|upgrade)
# install, upgrade
# - check, if extension will be installed in an instance,
# where it already exists?
dzhandle preinst-extension -m "$*" #PACKAGE# #DZ-DIR# #DZ-ADDON#
esac
fi
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