preinst is in runit 2.1.2-3ubuntu1.
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 | #!/bin/sh
set -e
test "$1" = 'upgrade' || exit 0
test ! -x /sbin/runit || test -e /sbin/runit.old || \
ln /sbin/runit /sbin/runit.old
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