Set a custom attribute of `test=host` onto a preallocated host blueprint and ran:
```
june-linux-laptop:~/Projects/Phabricator/phabricator> bin/drydock lease --type host --attributes platform=linux,attr_test=abc
[2015-08-24 05:21:08] EXCEPTION: (Exception) Lease has been broken! at [<phabricator>/src/applications/drydock/storage/DrydockLease.php:172]
arcanist(head=master, ref.master=9b8c9d280ea4), phabricator(head=hachque-reconstructed, ref.master=e0faa66772ed, ref.hachque-reconstructed=8aac04eb678f), phutil(head=hachque-master, ref.master=81eed10bea57, ref.hachque-master=fd52935292b9)
#0 DrydockLease::waitForLeases(array) called at [<phabricator>/src/applications/drydock/storage/DrydockLease.php:198]
#1 DrydockLease::waitUntilActive() called at [<phabricator>/src/applications/drydock/management/DrydockManagementLeaseWorkflow.php:61]
#2 DrydockManagementLeaseWorkflow::execute(PhutilArgumentParser) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:406]
#3 PhutilArgumentParser::parseWorkflowsFull(array) called at [<phutil>/src/parser/argument/PhutilArgumentParser.php:301]
#4 PhutilArgumentParser::parseWorkflows(array) called at [<phabricator>/scripts/drydock/drydock_control.php:21]
june-linux-laptop:~/Projects/Phabricator/phabricator> bin/drydock lease --type host --attributes platform=linux,attr_test=host
Acquired Lease 418
```