/usr/lib/qmail/prepare-upgrade-from-nonfree is in qmail-tools 0.1.0.
This file is owned by root:root, with mode 0o755.
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 | #!/bin/sh
case "$1" in
--uids-gids)
cat >&2 <<-\EOT
Upgrading qmail uids and gids from the package in Debian/non-free is
not yet supported.
EOT
exit 1
;;
--run)
cat >&2 <<-\EOT
Upgrading qmail MTA from the package in Debian/non-free is not yet
supported.
EOT
exit 1
;;
*)
cat >&2 <<-\EOT
Upgrading qmail from the package in Debian/non-free is not yet
supported.
EOT
exit 1
;;
esac
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