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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 # Switch the alternatives database backups from xz to gzip, as the latter # is Essential and we can rely on it being always present, using xz here # is not worth the trouble, disk space savings, or possible additional # dependencies. for dbseq in `seq 1 6` ; do dbfile=${dbalt}.tar.${dbseq} [ -e "${dbfile}.xz" ] || continue unxz ${dbfile}.xz gzip -9 $dbfile done # 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