preinst is in libdevmapper1.02.1 2:1.02.48-4ubuntu7.
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 | #!/bin/sh
if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" "<<" "2:1.02.24"; then
update-rc.d -f libdevmapper1.02.1 remove >/dev/null || exit $?
rm /etc/init.d/libdevmapper1.02.1
fi
exit 0
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