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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 $dbfiles ; do
if ! [ -s "dpkg.${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.$db"
fi
savelog -c 7 "dpkg.$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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