preinst is in exim4-config 4.90.1-1ubuntu1.
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 | #!/bin/sh
set -e
if [ -n "$EX4DEBUG" ]; then
echo "now debugging $0 $@"
set -x
fi
# Remove a no-longer used conffile
# Solution and code taken from http://wiki.debian.org/DpkgConffileHandling
# and "beautified" (hopefully not broken)
rm_conffile() {
PKGNAME="$1"
CONFFILE="$2"
if [ -e "$CONFFILE" ]; then
md5sum="$(md5sum "$CONFFILE" | sed -e "s/ .*//")"
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
fi
}
case "$1" in
install|upgrade)
if dpkg --compare-versions "$2" lt "4.68-1"; then
rm_conffile exim4-config "/etc/exim4/conf.d/acl/20_exim4-config_whitelist_local_deny"
rm_conffile exim4-config "/etc/exim4/conf.d/router/250_exim4-config_lowuid"
fi
esac
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