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

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.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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