preinst is in libxml-sax-perl 0.99+dfsg-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 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | #!/bin/sh
## ----------------------------------------------------------------------
## debian/preinst : preinstallation script for libxml-sax-perl
## ----------------------------------------------------------------------
## ----------------------------------------------------------------------
set -e
if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" le 0.16.0.1
then
# find out the md5sum of an unmodified ParserDetails.ini
[ -d /var/lib/libxml-sax-perl ] || mkdir --parents /var/lib/libxml-sax-perl
update-perl-sax-parsers --quiet --update --file - | md5sum - \
> /var/lib/libxml-sax-perl/ParserDetails.ini.md5sum
fi
if [ "$1" = "install" ] && [ -n "$2" ] && \
dpkg --compare-versions "$2" le 0.16.0.1
then
# upgrading from a removed but nonpurged state
# an unmodified ParserDetails.ini is an empty file
# we don't have update-perl-sax-parsers available yet
[ -d /var/lib/libxml-sax-perl ] || mkdir --parents /var/lib/libxml-sax-perl
md5sum - < /dev/null > /var/lib/libxml-sax-perl/ParserDetails.ini.md5sum
fi
## ----------------------------------------------------------------------
## automatically generated debhelper commands
exit 0
## ----------------------------------------------------------------------
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