blob: dbb0d6ca01de88b164a1580aaefddf94123fa612 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
#!/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:-$PKGDATADIR_DEFAULT}"
# shellcheck source=src/sh/dpkg-error.sh
. "$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
|
