preinst is in nbd-server 1:2.9.25-2ubuntu1.1.
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 | #!/bin/sh
# If upgrading from pre-2.9, move /etc/nbd-server away.
if [ "$1" = "upgrade" ]
then
if dpkg --compare-versions "$2" lt 2.9
then
mv /etc/nbd-server /etc/nbd-server.oldconf
fi
fi
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