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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 dpkg-maintscript-helper(1)
##
## Functions to remove an obsolete conffile during upgrade
##
rm_conffile() {
local CONFFILE="$1"
local LASTVERSION="$2"
local PACKAGE="$3"
if [ "$LASTVERSION" = "--" ]; then
LASTVERSION=""
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE"
fi
if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE"
fi
# Skip remaining parameters up to --
while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
[ $# -gt 0 ] || badusage
shift
[ -n "$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" ] && [ -n "$2" ] &&
dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
prepare_rm_conffile "$CONFFILE" "$PACKAGE"
fi
;;
postinst)
if [ "$1" = "configure" ] && [ -n "$2" ] &&
dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
finish_rm_conffile $CONFFILE
fi
;;
postrm)
if [ "$1" = "purge" ]; then
rm -f "$CONFFILE.dpkg-bak" "$CONFFILE.dpkg-remove" \
"$CONFFILE.dpkg-backup"
fi
if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
[ -n "$2" ] &&
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-backup"
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-backup" ]; then
mv -f "$CONFFILE.dpkg-backup" "$CONFFILE.dpkg-bak"
fi
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-backup" ]; then
echo "Reinstalling $CONFFILE that was backupped"
mv "$CONFFILE.dpkg-backup" "$CONFFILE"
fi
}
##
## Functions to rename a conffile during upgrade
##
mv_conffile() {
local OLDCONFFILE="$1"
local NEWCONFFILE="$2"
local LASTVERSION="$3"
local PACKAGE="$4"
if [ "$LASTVERSION" = "--" ]; then
LASTVERSION=""
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE"
fi
if [ "$PACKAGE" = "--" -o -z "$PACKAGE" ]; then
PACKAGE="$DPKG_MAINTSCRIPT_PACKAGE"
fi
# Skip remaining parameters up to --
while [ "$1" != "--" -a $# -gt 0 ]; do shift; done
[ $# -gt 0 ] || badusage
shift
[ -n "$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" ] && [ -n "$2" ] &&
dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
prepare_mv_conffile "$OLDCONFFILE" "$PACKAGE"
fi
;;
postinst)
if [ "$1" = "configure" ] && [ -n "$2" ] &&
dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
finish_mv_conffile "$OLDCONFFILE" "$NEWCONFFILE"
fi
;;
postrm)
if [ "$1" = "abort-install" -o "$1" = "abort-upgrade" ] &&
[ -n "$2" ] &&
dpkg --compare-versions "$2" le-nl "$LASTVERSION"; then
abort_mv_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: $1" >&2
fi
}
error() {
echo "$PROGNAME: error: $1" >&2
exit 1
}
warning() {
echo "$PROGNAME: warning: $1" >&2
}
usage() {
cat <<END
Usage: $PROGNAME <command> <parameter>... -- <maintainer-script-parameter>...
Commands:
supports <command>
Returns 0 (success) if the given command is supported, 1 otherwise.
rm_conffile <conffile> [<last-version> [<package>]]
Remove obsolete conffile. Must be called in preinst, postinst and
postrm.
mv_conffile <old-conf> <new-conf> [<last-version> [<package>]]
Rename a conffile. Must be called in preinst, postinst and postrm.
help
Display this usage information.
END
}
badusage() {
usage
exit 1
}
# Main code
set -e
PROGNAME=$(basename $0)
version="1.16.1.2"
command="$1"
[ $# -gt 0 ] || badusage
shift
case "$command" in
supports)
case "$1" in
rm_conffile|mv_conffile)
code=0
;;
*)
code=1
;;
esac
if [ -z "$DPKG_MAINTSCRIPT_NAME" ]; then
warning "environment variable DPKG_MAINTSCRIPT_NAME missing"
code=1
fi
if [ -z "$DPKG_MAINTSCRIPT_PACKAGE" ]; then
warning "environment variable DPKG_MAINTSCRIPT_PACKAGE missing"
code=1
fi
exit $code
;;
rm_conffile)
rm_conffile "$@"
;;
mv_conffile)
mv_conffile "$@"
;;
--help|help|-?|-h)
usage
;;
--version)
cat <<-END
Debian $PROGNAME version $version.
Copyright (C) 2010 Raphaël Hertzog <hertzog@debian.org>
Copyright (C) 2008 Joey Hess <joeyh@debian.org>
Copyright (C) 2007 Guillem Jover <guillem@debian.org>
Copyright (C) 2005 Scott James Remnant
This is free software; see the GNU General Public License version 2 or
later for copying conditions. There is NO warranty.
END
;;
*)
cat >&2 <<-END
$PROGNAME: error: command $command is unknown
Hint: upgrading dpkg to a newer version might help.
END
usage
exit 1
esac
exit 0