postinst is in nyancat-server 1.2.2-1.
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 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | #!/bin/sh
set -e
OLD_NYANCAT_ENTRY="telnet stream tcp nowait nobody /usr/bin/nyancat nyancat -t"
RELEASE="1.0+git20120523.99dc310-1"
case "$1" in
configure)
# if upgrading from previous non reconf-inetd version
if dpkg --compare-versions "$2" lt-nl "$RELEASE"; then
# remove previous update-inetd entry if unmodified
if fgrep -qx "#<off># $OLD_NYANCAT_ENTRY" /etc/inetd.conf || \
fgrep -qx "$OLD_NYANCAT_ENTRY" /etc/inetd.conf; then
if [ -x /usr/sbin/update-inetd ]; then
# remove nyancat reconf-inetd entries
update-inetd --multi --pattern nyancat --remove telnet || true
if [ -x /usr/sbin/reconf-inetd ]; then
# add the nyancat-server entries back again
reconf-inetd || true
fi
fi
fi
fi
;;
esac
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