preinst is in libcommons-validator-java 1:1.4.0-2.
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 | #!/bin/sh
set -e
# Automatically added by dh_installcatalogs
if test -f /etc/sgml/libcommons-validator-java.cat -a "(" "$1" = "upgrade" -o "$1" = "install" -a -n "$2" ")" &&
! dpkg-query -S /etc/sgml/libcommons-validator-java.cat >/dev/null 2>&1; then
# If the dpkg-query command returns non-zero, the central catalog is
# not owned by any package. This is due to an old behaviour of
# debhelper. Now that file becomes a conffile. In order to avoid a
# question during installation, we remove the old non-conffile.
mv /etc/sgml/libcommons-validator-java.cat /etc/sgml/libcommons-validator-java.cat.old
fi
# End automatically added section
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