Open Stack

This is a follow up thread to [1]

In order to have consistency across clients, I am proposing that the client
side sorting has the following syntax: --sort <key>[:<direction>]

Where the --sort parameter is comma-separated and is used to specify one or
more sort keys and directions. The direction defaults to 'desc' for each
sort key and the user can supply 'asc' to override.

For example:

  nova list --sort display_name
  nova list --sort display_name,vm_state
  nova list --sort display_name:asc,vm_state:asc

If approved, then the following changes are needed for glance and cinder
(note that nova already uses this syntax):

  Cinder: Deprecate --sort_key and --sort_dir and add support for --sort
  Glance: Modify [2] to this new syntax

I have not verified how all other projects handle sorting, there may be
other projects that would also need to be changed.

Thoughts?  Objections?

Also, if there is a more formal way to propose/review this standard please
let me know.

[1]
http://www.mail-archive.com/openstack-dev@lists.openstack.org/msg42854.html
[2] https://review.openstack.org/#/c/120777/

Thanks,
Steven Kaufer
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