R6PCOVLXQHWE6B5DZGLO6KGCLIZNGOUSO63HIMHLPSZZYUKXHJ4AC
UGA45FNCYAHX77QI3MTMSRF676N2BUW2ZUUI4OZCI2C3EJOYKY3QC
my $tempdir = File::Temp->newdir("s3-backup-nars-$build_id" . "XXXXX");
my $tempdir = File::Temp->newdir("s3-backup-nars-$build_id" . "XXXXX", TMPDIR => 1);