preinst is in apturl-common 0.5.1ubuntu3.
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
# Prepare to move a conffile without triggering a dpkg question
prep_mv_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
rm -f "$CONFFILE"
fi
}
case "$1" in
install|upgrade)
if dpkg --compare-versions "$2" le "0.4.1ubuntu4"; then
prep_mv_conffile apturl-common "/etc/firefox-3.0/pref/apturl.js"
fi
esac
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