postinst is in tinywm 1.3-9.
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 40 41 42 43 44  | #!/bin/sh
#
#  tinywm postinst
#
#  Shamelessly ripped off of Marcelo Magallon's script
#     by Brent Fulgham <bfulgham@debian.org>
#
#
# Ripped off blackbox's postinst, by Matt Hope <dopey@debian.org>
# and ripped off once again by Nobuhoro Iwamatsu <hemamu@t-base.ne.jp>
#
set -e
WMentry="/usr/bin/tinywm"
add_wm_entry ()
{
	update-alternatives --install /usr/bin/x-window-manager \
	x-window-manager $WMentry 20 \
	--slave /usr/share/man/man1/x-window-manager.1.gz \
	x-window-manager.1.gz /usr/share/man/man1/tinywm.1.gz
}
case "$1" in
    configure)
        add_wm_entry
    ;;
    abort-*)
        # how did we get here?  Force a non-zero exit code
        exit 1
    ;;
    *)
    ;;
esac
# Automatically added by dh_installmenu
if [ "$1" = "configure" ] && [ -x "`which update-menus 2>/dev/null`" ]; then
	update-menus
fi
# End automatically added section
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