preinst is in xscreensaver 5.30-1+deb8u2.
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 35 36 37 38 39 40 41 42 43 | #!/bin/sh
# preinst script for xscreensaver
#
# see: dh_installdeb(1)
set -e
# Remove a no-longer used conffile
rm_conffile() {
local PKGNAME="$1"
local CONFFILE="$2"
[ -e "$CONFFILE" ] || return 0
local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PKGNAME | \
sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
if [ "$md5sum" != "$old_md5sum" ]; then
echo "Obsolete conffile $CONFFILE has been modified by you."
echo "Saving as $CONFFILE.dpkg-bak ..."
mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
else
echo "Removing obsolete conffile $CONFFILE ..."
rm -f "$CONFFILE"
fi
}
case "$1" in
install|upgrade)
# Remove a file which was mistakenly shipped in 5.10-2
# and kept in 5.10-3 but deleted unconditionally since 5.10-4
if dpkg --compare-versions "$2" le "5.10-3"; then
rm_conffile xscreensaver "/etc/X11/Xsession.d/80xscreensaver_start"
fi
# Was shipped in -3,-4,-5 but deleted unconditionally since 5.10-6
if dpkg --compare-versions "$2" le "5.10-5"; then
rm_conffile xscreensaver "/etc/xdg/autostart/xscreensaver-daemon.desktop"
fi
esac
exit 0
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