[Sheepdog] refinement of shepherd commands

[MORITA Kazutaka]

On Thu, May 6, 2010 at 11:50 PM, Chris Webb <chris at arachsys.com> wrote:
> MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp> writes:
>
>> shepherd command [command options]
>>
>> Command list:
>>   vdi-info              show virtual disk image information
>>   vdi-delete            delete a vdi
>>   vdi-list              list vdis
>>   vdi-lock              lock a vdi (for debug)
>>   vdi-release           release a vdi (for debug)
>>   vdi-object            show object infomation in the vdi
>>   node-info             show sheepdog node information
>>   node-list             list nodes
>>   node-start            start collie daemon on the node
>>   node-stop             stop collie daemon on the node
>>   vm-info               show virtual machines information
>>   vm-list               list virtual machines
>>   cluster-info          show sheepdog cluster information
>>   cluster-format        format sheepdog
>>   cluster-shutdown      shutdown sheepdog
>>   help                  print help
>> ==
>>
>> Any comments and suggestions are appriciated.
>
> Hi. I think this looks much more regular. It could even be (git-style)
>
>  shepherd vdi info
>  [etc]
>
> which would allow shepherd vdi [--]help to give more detailed help for vdi
> operations.
>

Your suggestion looks more general, thanks!

> Something else I think would be very desirable is regular, easy-to-parse
> output. It's very likely that shepherd and other scripts will be called from
> management scripts/daemons which will need to parse its output, so it'd be
> nice to have either a simple default output format (which might be less
> pretty than the current tabular output), or a 'plain' output mode specially
> designed to be easily parsed from scripts with a
>
>  while read A B ...; do ...; done
>
> idiom in shell, or strtok/strsep in C.
>

Yes, I think providing a machine parsable format option is useful for many
users, too.

Thanks,

Kazutaka