48 lines
1.6 KiB
Plaintext
48 lines
1.6 KiB
Plaintext
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#!/bin/sh
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dbdir=/var/lib/dpkg
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# Backup the 7 last versions of dpkg databases containing user data.
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if cd /var/backups ; 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 $dbfiles ; do
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if ! cmp -s dpkg.${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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[ -e $dbdir/$db ] || continue
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cp -p $dbdir/$db dpkg.$db
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savelog -c 7 dpkg.$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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# Switch the alternatives database backups from xz to gzip, as the latter
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# is Essential and we can rely on it being always present, using xz here
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# is not worth the trouble, disk space savings, or possible additional
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# dependencies.
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for dbseq in `seq 1 6` ; do
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dbfile=${dbalt}.tar.${dbseq}
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[ -e "${dbfile}.xz" ] || continue
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unxz ${dbfile}.xz
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gzip -9 $dbfile
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done
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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 7 ${dbalt}.tar >/dev/null
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fi
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fi
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