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etc/cron.daily/dpkg

@@ -0,0 +1,36 @@
+#!/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