#!/bin/sh
set -e

# stop backend here when upgrading from a version that didn't handle
# it correctly yet in the prerm

# Remove a no-longer used conffile
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-nl 2.2.1-5; then
            test -x /etc/dbus-1/event.d/70system-tools-backends && \
                /etc/dbus-1/event.d/70system-tools-backends stop || true
            rm_conffile system-tools-backends "/etc/dbus-1/event.d/70system-tools-backends"
        fi
        if dpkg --compare-versions "$2" lt-nl 2.6.0-3; then
            rm_conffile system-tools-backends "/etc/init.d/system-tools-backends"
            update-rc.d system-tools-backends remove
        fi
        if [ -f /etc/dbus-1/system.d/system-tools-backends.conf ] && \
           [ -f /etc/dbus-1/system.d/org.freedesktop.SystemToolsBackends.conf ]; then
            # We have both old and new conffiles, which probably means that a version
            # between 2.6.0-6.1 and 2.10.1-2 was installed.
            if echo "68224c4af00f723e7e08992a91ddc9f286fc4f4c  /etc/dbus-1/system.d/system-tools-backends.conf" |
               sha1sum --check --status -; then
                # Old conffile was not modified, let's just remove it
                rm -f /etc/dbus-1/system.d/system-tools-backends.conf
            else
                # Otherwise, rename it
                mv /etc/dbus-1/system.d/system-tools-backends.conf \
                        /etc/dbus-1/system.d/system-tools-backends.conf.dpkg-remove
            fi
        fi
        ;;
esac