[WHIRR-195] Display available roles instead of service names when running ./bin/whirr

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Component/s: cli
• Assignee: Andrei Savu
• Reporter: Andrei Savu
• Created: 07/Jan/11 10:32
• Updated: 30/Jan/11 03:59
• Resolved: 30/Jan/11 03:59

Description

Now that service-name is optional I believe that we should display a list of the available roles (with a small description) instead of service names.

Similar to:

$ ./bin/whirr 
Usage: whirr COMMAND [ARGS]
where COMMAND may be one of:

        version  Print the version number and exit.
 launch-cluster  Launch a new cluster running a service.
destroy-cluster  Terminate and cleanup resources for a running cluster.
   list-cluster  List the nodes in a cluster.

Available roles for instances:
  nn             hadoop name node
  jt             hadoop job trackers
  ...