preinst is in ifupdown-extra 0.28.
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 | #!/bin/sh
set -e
case "$1" in
install|upgrade)
if [ -e /etc/network/network-routes ] ; then
# There was a bug in the package (<< 0.15). We need to
# move the file to the new location
if dpkg-maintscript-helper supports mv_conffile; then
dpkg-maintscript-helper mv_conffile \
/etc/network/network-routes /etc/network/routes 0.14 -- "$@"
fi
fi
;;
esac
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