same_fs_or_die($dir, $old);
my $v = PublicInbox::Search::SCHEMA_VERSION();
my $wip = File::Temp->newdir("xapian$v-XXXX", DIR => $dir);
$tmp->{$old} = $wip;
nodatacow_dir($wip->dirname);
push @queue, [ $old, $wip ];
same_fs_or_die($dir, $old);
my $v = PublicInbox::Search::SCHEMA_VERSION();
my $wip = File::Temp->newdir("xapian$v-XXXX", DIR => $dir);
$tmp->{$old} = $wip;
nodatacow_dir($wip->dirname);
push @queue, [ $old, $wip ];