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Re: [libvirt] [PATCH v2] Allow 10 chars for domain IDs & 30 chars for names in virsh list



On Thu, Jan 12, 2012 at 08:20:02AM -0700, Eric Blake wrote:
> On 01/12/2012 05:49 AM, Peter Krempa wrote:
> > On 01/12/2012 01:19 PM, Daniel P. Berrange wrote:
> >> From: "Daniel P. Berrange"<berrange redhat com>
> >>
> >> Domain IDs are at least 16 bits for most hypervisors, theoretically
> >> event 32-bits.  3 characters is clearly too small an alignment.
> >> Increase alignment to 10 characters to allow 32-bit domain IDs to
> >> display cleanly. Commonly seen with LXC where domain IDs are the
> >> process IDs by default.  Also increase the 'name' field from 20
> >> to 30 characters to cope with longer guest names which are quite
> >> common
> >>
> >> In v2:
> >>
> >>   - Increase size to 10 chars
> >>   - Left align ID values
> >>   - Also increase name field to 30
> >>   - Increase number of '-' to compensate
> >>
> >> ---
> > I think that 10 characters is a lot of space wasted in most of cases :/.
> > What about calculating the alignment dynamicaly? I'm adding code to the
> > list command, so I could add that as a part of my patch.
> 
> A generic helper function for dynamically sizing columns would indeed be
> nice, but I think that can be a follow up.  It would require callers to
> allocate a char*** - an array rows to be formatted, where each row is
> represented by an array of columns.
> 
> I'm okay with Daniel's patch going in now, as it is a strict
> improvement, even if we make further improvements down the road.

I will reduce the 'id' column back down to '5' for now, since there is
not an immediate critical need to cope with the full 32bits.

Daniel
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