postinst is in isc-dhcp-client 4.3.1-6+deb8u3.
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 27 28 29 30 | #!/bin/sh
#
#
set -e
# Source debconf library.
. /usr/share/debconf/confmodule
case "$1" in
configure)
if [ ! -e /var/lib/dhcp/dhclient.leases ]; then
if test -e /var/lib/dhcp3/dhclient.leases; then
cp /var/lib/dhcp3/dhclient.leases /var/lib/dhcp/dhclient.leases
else
touch /var/lib/dhcp/dhclient.leases
fi
fi
;;
abort-upgrade|abort-remove|abort-deconfigure)
exit 0
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 0
;;
esac
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