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#!/bin/sh
dbdir=/var/lib/dpkg
# Backup the 7 last versions of dpkg databases containing user data.
if cd /var/backups ; 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 $dbfiles ; do
if ! cmp -s dpkg.${db}.0 $dbdir/$db ; then
dbchanged=yes
break;
fi
done
if [ "$dbchanged" = "yes" ] ; then
for db in $dbfiles ; do
[ -e $dbdir/$db ] || continue
cp -p $dbdir/$db dpkg.$db
savelog -c 7 dpkg.$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 7 ${dbalt}.tar >/dev/null
fi
fi
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