postinst is in mustang-plug 1.2-1build1.
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  | #!/bin/sh
set -e
# Automatically added by dh_usrlocal/11.1.6ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ]; then
(
	while read line; do
		set -- $line
		dir="$1"; mode="$2"; user="$3"; group="$4"
		if [ ! -e "$dir" ]; then
			if mkdir "$dir" 2>/dev/null; then
				chown "$user":"$group" "$dir"
				chmod "$mode" "$dir"
			fi
		fi
	done
) << DATA
/usr/local/bin 02775 root staff
DATA
fi
# End automatically added section
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