postinst is in libapache2-mod-wsgi 3.3-4ubuntu0.2.
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 38 39 | #!/bin/sh
set -e
apache_force_reload() {
    if apache2ctl configtest 2>/dev/null; then
        #invoke-rc.d apache2 force-reload || true
        # use "restart" as a workaround for bug #558608
        invoke-rc.d apache2 restart || true
    else
        echo "Your apache2 configuration is broken, please fix it and restart apache2 manually."
    fi
}
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
}
if [ -z "$2" ]; then
    update_symlink
    if [ -e /etc/apache2/apache2.conf ]; then
        a2enmod wsgi >/dev/null || true
        apache_force_reload
    fi
else
    #we're upgrading
    update_symlink
    if [ -e /etc/apache2/mods-enabled/wsgi.load ]; then
        apache_force_reload
    fi
fi
exit 0
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