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