postinst is in ecryptfs-utils 104-0ubuntu1.
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 31 32 33 34 | #!/bin/sh
set -e
chmod 755 /usr/share/ecryptfs-utils/*.desktop || true
case "${1}" in
	configure)
		[ -e /var/log/installer/syslog ] && sed -i '/user-setup: YOU SHOULD RECORD THIS/,+2 d' /var/log/installer/syslog
		pam-auth-update --package
		# Try to migrate encrypted Private counters from /tmp to /dev/shm, if sane
		for i in $(ls /home); do
			if [ -f "/tmp/ecryptfs-$i-Private" ] && [ ! -e "/dev/shm/ecryptfs-$i-Private" ]; then
				o=$(stat -c %U "/tmp/ecryptfs-$i-Private")
				if [ $i = $o ]; then
					mv -f /tmp/ecryptfs-$i-Private /dev/shm
				fi
			fi
		done
		;;
	abort-upgrade|abort-remove|abort-deconfigure)
		;;
	*)
		echo "postinst called with unknown argument \`{$1}'" >&2
		exit 1
		;;
esac
exit 0
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