prerm is in openjdk-8-jre-headless 8u162-b12-1.
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 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #!/bin/sh
set -e
basedir=/usr/lib/jvm/java-8-openjdk-amd64
jre_tools='rmid java keytool jjs pack200 rmiregistry unpack200 orbd servertool tnameserv'
rm -f $basedir/jre/lib/amd64/client/classes.jsa
rm -f $basedir/jre/lib/amd64/server/classes.jsa
if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
for i in $jre_tools; do
update-alternatives --remove $i $basedir/jre/bin/$i
done
if which update-binfmts >/dev/null; then
# try to remove and ignore the error
if [ -e /var/lib/binfmts/openjdk-8 ]; then
update-binfmts --package openjdk-8 \
--remove jar /usr/bin/jexec || true
fi
fi
update-alternatives --remove jexec $basedir/jre/lib/jexec
fi
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