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+#!/bin/sh
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+#
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+# Copyright © 2010 Raphaël Hertzog <hertzog@debian.org>
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+# Copyright © 2008 Joey Hess <joeyh@debian.org>
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+# Copyright © 2007 Guillem Jover (modifications on wiki.debian.org)
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+# Copyright © 2005 Scott James Remnant (original implementation on www.dpkg.org)
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+#
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 2 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+# The conffile related functions are inspired by
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+# http://wiki.debian.org/DpkgConffileHandling
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+
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+# This script is documented in maintscript-helper(1)
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+
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+##
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+## Functions to remove an obsolete conffile during upgrade
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+##
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+rm_conffile() {
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+ local CONFFILE="$1"
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+ local LASTVERSION="$2"
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+ local PACKAGE="$3"
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+ if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
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+ PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE"
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+ fi
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+ # Skip remaining parameters up to --
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+ while [ "$1" != "--" -a "$1" != "" ]; do shift; done
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+ shift
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+
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+ [ -n "$PACKAGE" ] || error "couldn't identify the package"
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+ [ -n "$1" ] || error "maintainer script parameters are missing"
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+ [ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
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+ error "environment variable DPKG_MAINTSCRIPT_NAME is required"
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+
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+ debug "Executing $0 rm_conffile in $DPKG_MAINTSCRIPT_NAME "\
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+ "of $DPKG_MAINTSCRIPT_PACKAGE"
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+ debug "CONFFILE=$CONFFILE PACKAGE=$PACKAGE "\
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+ "LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
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+ case "$DPKG_MAINTSCRIPT_NAME" in
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+ preinst)
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+ if [ "$1" = "install" -o "$1" = "upgrade" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ prepare_rm_conffile "$CONFFILE" "$PACKAGE"
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+ fi
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+ ;;
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+ postinst)
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+ if [ "$1" = "configure" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ finish_rm_conffile $CONFFILE
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+ fi
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+ ;;
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+ postrm)
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+ if [ "$1" = "purge" ]; then
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+ rm -f "$CONFFILE.dpkg-bak" "$CONFFILE.dpkg-remove"
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+ fi
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+ if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ abort_rm_conffile "$CONFFILE"
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+ fi
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+ ;;
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+ *)
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+ debug "$0 rm_conffile not required in $DPKG_MAINTSCRIPT_NAME"
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+ ;;
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+ esac
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+}
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+
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+prepare_rm_conffile() {
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+ local CONFFILE="$1"
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+ local PACKAGE="$2"
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+
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+ [ -e "$CONFFILE" ] || return 0
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+
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+ local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
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+ local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PACKAGE | \
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+ sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
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+ if [ "$md5sum" != "$old_md5sum" ]; then
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+ echo "Obsolete conffile $CONFFILE has been modified by you."
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+ echo "Saving as $CONFFILE.dpkg-bak ..."
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+ mv -f "$CONFFILE" "$CONFFILE.dpkg-bak"
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+ else
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+ echo "Moving obsolete conffile $CONFFILE out of the way..."
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+ mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
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+ fi
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+}
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+
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+finish_rm_conffile() {
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+ local CONFFILE="$1"
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+
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+ if [ -e "$CONFFILE.dpkg-remove" ]; then
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+ echo "Removing obsolete conffile $CONFFILE ..."
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+ rm -f "$CONFFILE.dpkg-remove"
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+ fi
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+}
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+
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+abort_rm_conffile() {
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+ local CONFFILE="$1"
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+
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+ if [ -e "$CONFFILE.dpkg-remove" ]; then
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+ echo "Reinstalling $CONFFILE that was moved away"
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+ mv "$CONFFILE.dpkg-remove" "$CONFFILE"
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+ fi
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+ if [ -e "$CONFFILE.dpkg-bak" ]; then
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+ echo "Reinstalling $CONFFILE that was backupped"
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+ mv "$CONFFILE.dpkg-bak" "$CONFFILE"
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+ fi
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+}
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+
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+##
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+## Functions to rename a conffile during upgrade
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+##
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+mv_conffile() {
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+ local OLDCONFFILE="$1"
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+ local NEWCONFFILE="$2"
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+ local LASTVERSION="$3"
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+ local PACKAGE="$4"
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+ if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
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+ PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE"
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+ fi
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+ # Skip remaining parameters up to --
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+ while [ "$1" != "--" -a "$1" != "" ]; do shift; done
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+ shift
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+
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+ [ -n "$PACKAGE" ] || error "couldn't identify the package"
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+ [ -n "$1" ] || error "maintainer script parameters are missing"
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+ [ -n "$DPKG_MAINTSCRIPT_NAME" ] || \
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+ error "environment variable DPKG_MAINTSCRIPT_NAME is required"
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+
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+ debug "Executing $0 mv_conffile in $DPKG_MAINTSCRIPT_NAME "\
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+ "of $DPKG_MAINTSCRIPT_PACKAGE"
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+ debug "CONFFILE=$OLDCONFFILE -> $NEWCONFFILE PACKAGE=$PACKAGE "\
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+ "LASTVERSION=$LASTVERSION ACTION=$1 PARAM=$2"
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+ case "$DPKG_MAINTSCRIPT_NAME" in
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+ preinst)
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+ if [ "$1" = "install" -o "$1" = "upgrade" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ prepare_mv_conffile "$OLDCONFFILE" "$PACKAGE"
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+ fi
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+ ;;
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+ postinst)
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+ if [ "$1" = "configure" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ finish_mv_conffile "$OLDCONFFILE" "$NEWCONFFILE"
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+ fi
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+ ;;
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+ postrm)
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+ if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
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+ dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
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+ abort_rm_conffile "$OLDCONFFILE"
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+ fi
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+ ;;
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+ *)
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+ debug "$0 mv_conffile not required in $DPKG_MAINTSCRIPT_NAME"
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+ ;;
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+ esac
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+}
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+
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+prepare_mv_conffile() {
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+ local CONFFILE="$1"
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+ local PACKAGE="$2"
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+
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+ [ -e "$CONFFILE" ] || return 0
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+
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+ local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
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+ local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PACKAGE | \
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+ sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
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+ if [ "$md5sum" = "$old_md5sum" ]; then
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+ mv -f "$CONFFILE" "$CONFFILE.dpkg-remove"
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+ fi
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+}
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+
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+finish_mv_conffile() {
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+ local OLDCONFFILE="$1"
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+ local NEWCONFFILE="$2"
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+
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+ rm -f $OLDCONFFILE.dpkg-remove
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+
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+ [ -e "$OLDCONFFILE" ] || return 0
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+
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+ echo "Preserving user changes to $NEWCONFFILE (renamed from $OLDCONFFILE)..."
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+ mv -f "$NEWCONFFILE" "$NEWCONFFILE.dpkg-new"
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+ mv -f "$OLDCONFFILE" "$NEWCONFFILE"
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+}
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+
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+abort_mv_conffile() {
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+ local CONFFILE="$1"
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+
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+ if [ -e "$CONFFILE.dpkg-remove" ]; then
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+ echo "Reinstalling $CONFFILE that was moved away"
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+ mv "$CONFFILE.dpkg-remove" "$CONFFILE"
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+ fi
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+}
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+
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+# Common functions
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+debug() {
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+ if [ -n "$DPKG_DEBUG" ]; then
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+ echo "DEBUG: $PROGNAME: $1" >&2
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+ fi
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+}
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+
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+error() {
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+ echo "ERROR: $PROGNAME: $1" >&2
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+ exit 1
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+}
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+
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+usage() {
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+ cat <<END
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+Syntax: $0 <command> [<parameters>] -- <maintainer script parameters>
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+
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+Commands and parameters:
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+
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+ rm_conffile <conffile> <last-version> [<package>]
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+ Remove obsolete conffile.
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+ Must be called in preinst, postinst and postrm.
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+
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+ mv_conffile <old-conf> <new-conf> <last-version> [<package>]
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+ Rename a conffile.
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+ Must be called in preinst, postinst and postrm.
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+
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+ help
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+ Display this usage information.
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+END
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+}
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+
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+# Main code
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+set -e
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+
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+PROGNAME=$(basename $0)
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+command="$1"
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+shift
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+
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+case "$command" in
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+rm_conffile)
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+ rm_conffile "$@"
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+ ;;
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+mv_conffile)
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+ mv_conffile "$@"
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+ ;;
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+--help|help|-?|-h)
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+ usage
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+ ;;
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+*)
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+ usage
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+ exit 1
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+esac
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+
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+exit 0
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Raphaël Hertzog