use File::Spec;
use File::Path qw/ make_path /;
-my $root_dir = '/mnt/Shared/Personal/My art';
-my $link_dir = '/var/www/html/public';
-my $http_uri = 'http://136.63.171.222/public';
+my $root_dir = $ENV{PUBLIC_ROOT_DIR}
+ or die "Need PUBLIC_ROOT_DIR\n";
+my $link_dir = $ENV{PUBLIC_LINK_DIR}
+ or die "Need PUBLIC_LINK_DIR\n";
+my $http_uri = $ENV{PUBLIC_HTTP_URI}
+ or die "Need PUBLIC_HTTP_URI\n";
sub nonce {