preinst is in libservice-wrapper-java 3.5.22-2ubuntu1.
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 -e
if [ ! -z $2 ]; then
if dpkg --compare-versions $2 lt 3.5.9-3; then
test -d /usr/share/doc/libservice-wrapper-java \
&& rm -rf /usr/share/doc/libservice-wrapper-java
fi
fi
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