I am ok with a staged approach, although I do think its something we
should start in Kilo. That said though, we emit a warning if the
installation doesn't have a working libguestfs in juno.

Michael

On Tue, Sep 23, 2014 at 8:09 PM, Daniel P. Berrange <berra...@redhat.com> wrote:
> On Tue, Sep 23, 2014 at 09:53:36AM +1000, Michael Still wrote:
>> Hi.
>>
>> I know we've been talking about deprecating nova.virt.disk.vfs.localfs
>> for a long time, in favour of wanting people to use libguestfs
>> instead. However, I can't immediately find any written documentation
>> for when we said we'd do that thing.
>>
>> Additionally, this came to my attention because Ubuntu 14.04 is
>> apparently shipping a libguestfs old enough to cause us to emit the
>> "falling back to localfs" warning, so I think we need Ubuntu to catch
>> up before we can do this thing.
>>
>> So -- how about we remove localfs early in Kilo to give Canonical a
>> release to update libguestfs?
>
> Rather than removing localfs right away how about we add an explicit
> config parameter to control behaviour
>
>   vfs_impl=auto|guestfs|localfs
>
> where
>
>   auto == try libguestfs, fallback to localfs
>   guestfs == try libguestfs, error otherwise
>   localfs == try localfs, error otherwise
>
> Currently we do 'auto' behaviour but in Kilo we could make 'guestfs'
> be the default, so there is no fallback. That way distros will quickly
> see if they have a problem, but still have option to reconfigure to
> use localfs if they need to.
>
> Regards,
> Daniel
> --
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