postinst is in fuse 2.9.4-1ubuntu3.
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 35 36 37 | #!/bin/sh
set -e
case "${1}" in
	configure)
		if ! dpkg-statoverride --list /bin/fusermount > /dev/null 2>&1
		then
			chmod 4755 /bin/fusermount
		fi
		# Drop this hunk in 16.10, "upgrade" permissions to new defaults 0600 -> 0644
		if dpkg --compare-versions "$2" lt-nl "2.9.4-1ubuntu2~"; then
		    if ! dpkg-statoverride --list /etc/fuse.conf >/dev/null 2>&1; then
			chmod 0644 /etc/fuse.conf
		    fi
		fi
		if [ -x /usr/sbin/update-initramfs ]
		then
			update-initramfs -u
		fi
		;;
	abort-upgrade|abort-remove|abort-deconfigure)
		;;
	*)
		echo "postinst called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac
exit 0
 |