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