postinst is in libapache2-mod-wsgi 4.3.0-1.1build1.
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 21 22 23 24 25 26 27 | #!/bin/sh
set -e
update_symlink() {
    wsgi_py=`readlink /usr/lib/apache2/modules/mod_wsgi.so | sed 's,.*-,,'`
    py_default=`dpkg -s python | grep '^Version' | sed 's,Version: \([^.]*.[^.]*\).*,\1,'`
    if [ ! "${wsgi_py}" = "${py_default}" ]; then
        ln -sf mod_wsgi.so-${py_default} /usr/lib/apache2/modules/mod_wsgi.so
    fi
}
update_symlink
# Automatically added by dh_apache2
if true; then
	if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
		. /usr/share/apache2/apache2-maintscript-helper
		for conf in wsgi  ; do
			apache2_invoke enmod $conf  || exit $?
		done
	fi
fi
# End automatically added section
exit 0
 |