[Bugs] [Bug 1226776] New: [RFE] volume capability query

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1226776

            Bug ID: 1226776
           Summary: [RFE] volume capability query
           Product: GlusterFS
           Version: mainline
         Component: core
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: csaba at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:

We need an interface, exposed through cli and gfapi, that allows the requestor
to get information about the capabilities of a volume. What a capability is not
defined here exactly, however, we mean high-level (user centric) properties
(beyond the technical parameters that can be interacted with through "volume
info / set"). The information given should be something like a scalar valued
dictionary, self-contained and human friendly (ie. a user should be able to
make sense of it without anything but basic familiarity of GlusterFS). 

The attainment of a capability on behalf of a volume depends on three factors:
- GlusterFS version (support of a feature at source level)
- GlusterFS build/deployment (support of a feature in the binary)
- particularities of the volume.

So for example take snapshot support: AFAIK only thin provisioned lv volumes
support snapshot, therefore snapshot support is a per-volume property.

Currently we have in mind as possible capabilites (shown here just to give a
taste of the idea, not meaning we'd need these in this exact form - also note
that of some of these refer to features that are still just RFEs):

- volume snapshot
- volume snapshot clone
- directory snapshot
- directory snapshot clone
- cert based auth
- cert based auth for directories
- thin provisioned

Upon implementing this RFE a broad scan of capability candidates should be
executed.

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