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#!/bin/sh # # Copyright © 2014, 2017-2018, 2020-2021 Guillem Jover <guillem@debian.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 <https://www.gnu.org/licenses/>. PROGNAME=$(basename "$0") ADMINDIR='/var/lib/dpkg' BACKUPSDIR='/var/backups' ROTATE=7 PKGDATADIR_DEFAULT='/usr/share/dpkg' PKGDATADIR="${DPKG_DATADIR:-$PKGDATADIR_DEFAULT}" # shellcheck source=src/sh/dpkg-error.sh . "$PKGDATADIR/sh/dpkg-error.sh" setup_colors while [ $# -ne 0 ]; do case "$1" in --rotate=*) ROTATE="${1#--rotate=}" ;; esac shift done # Check for required commands availability. for cmd in tar savelog; do if ! command -v $cmd >/dev/null; then error "cannot find required program '$cmd'" fi done dbdir="$ADMINDIR" # Backup the N last versions of dpkg databases containing user data. if cd $BACKUPSDIR ; then # We backup all relevant database files if any has changed, so that # the rotation number always contains an internally consistent set. dbchanged=no dbfiles="arch status diversions statoverride" for db in $dbfiles ; do if ! [ -s "dpkg.${db}.0" ] && ! [ -s "$dbdir/$db" ]; then # Special case the files not existing or being empty as being equal. continue elif ! cmp -s "dpkg.${db}.0" "$dbdir/$db"; then dbchanged=yes break fi done if [ "$dbchanged" = "yes" ] ; then for db in $dbfiles ; do if [ -e "$dbdir/$db" ]; then cp -p "$dbdir/$db" "dpkg.$db" else touch "dpkg.$db" fi savelog -c "$ROTATE" "dpkg.$db" >/dev/null done fi # The alternatives database is independent from the dpkg database. dbalt=alternatives # XXX: Ideally we'd use --warning=none instead of discarding stderr, but # as of GNU tar 1.27.1, it does not seem to work reliably (see #749307). if ! test -e ${dbalt}.tar.0 || ! tar -df ${dbalt}.tar.0 -C $dbdir $dbalt >/dev/null 2>&1 ; then tar -cf ${dbalt}.tar -C $dbdir $dbalt >/dev/null 2>&1 savelog -c "$ROTATE" ${dbalt}.tar >/dev/null fi fi