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43 lines
1.3 KiB
Plaintext
43 lines
1.3 KiB
Plaintext
2 years ago
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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 $dbfiles ; do
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if ! [ -s "dpkg.${db}.0" ] && ! [ -s "$dbdir/$db" ]; then
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# Special case the files not existing or being empty as being equal.
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continue
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elif ! 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 $dbfiles ; do
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if [ -e "$dbdir/$db" ]; then
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cp -p "$dbdir/$db" "dpkg.$db"
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else
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touch "dpkg.$db"
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fi
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savelog -c 7 "dpkg.$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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# 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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