- open (OUT, ">$config{wikistatedir}/aggregate" ||
- die "$config{wikistatedir}/aggregate: $!");
+ my $newfile="$config{wikistatedir}/aggregate.new";
+ # TODO: This cleanup function could use improvement. Any newly
+ # aggregated files are left behind unrecorded, and should be deleted.
+ my $cleanup = sub { unlink($newfile) };
+ open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);