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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 "$0")
ADMINDIR=/var/lib/dpkg
BACKUPSDIR=/var/backups
ROTATE=7
PKGDATADIR_DEFAULT=src
PKGDATADIR="${DPKG_DATADIR:-$PKGDATADIR_DEFAULT}"
TAR="${TAR:-tar}"
# 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
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