iptables call fails on very long folder names

[Volker Stampa]

By default blockade bases the name of iptables chains on the name of the folder where the blockade.yml resides. In case of long folder names this leads to the following exception:

iptables v1.4.21: chain name `blockade-countercassandraacyclic-p1' too long (must be under 29 chars)
Try `iptables -h' or 'iptables --help' for more information.
Traceback (most recent call last):
  File "../../crdt-counter-partitions.py", line 99, in <module>
    if not interact.requests_with_chaos(OPS, HOST, NODES, ARGS.iterations, ARGS.interval, ARGS.settle, ARGS.delay, ARGS.restarts):
  File "/vagrant/interact.py", line 156, in requests_with_chaos
    part = blk.random_partition()
  File "/blockade/blockade/core.py", line 390, in random_partition
    self.partition(partitions, state)
  File "/blockade/blockade/core.py", line 404, in partition
    container_partitions)
  File "/blockade/blockade/net.py", line 62, in partition_containers
    partition_containers(blockade_id, partitions)
  File "/blockade/blockade/net.py", line 298, in partition_containers
    iptables_create_chain(chain_name)
  File "/blockade/blockade/net.py", line 246, in iptables_create_chain
    iptables_call("-N", chain)
  File "/blockade/blockade/net.py", line 133, in iptables_call
    raise BlockadeError(error)
blockade.errors.BlockadeError: Problem calling 'iptables -N blockade-countercassandraacyclic-p1'

Maybe it makes sense to truncate the folder name before using it as blockade_id?