postrm is in nginx-common 1.2.1-2.2+wheezy4.
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
# systemd: reload the daemon
if [ -x /bin/systemctl ]; then
  systemctl daemon-reload >/dev/null 2>&1 || true
fi
case "$1" in
  upgrade)
    # systemd: start the new version of nginx
    if [ -x /bin/systemctl ]; then
      systemctl restart nginx.service
    fi
    ;;
  purge)
    rm -rf /var/lib/nginx /var/log/nginx /etc/nginx
    ;;
  remove|failed-upgrade|abort-install|abort-upgrade|disappear)
    ;;
  *)
    echo "postrm called with unknown argument \`$1'" >&2
    exit 1
    ;;
esac
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d nginx remove >/dev/null
fi
# End automatically added section
exit 0
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