Re: [PATCH] virsh: Allow listing just domain IDs

On Tue, Oct 20, 2020 at 15:02:07 +0200, Michal Privoznik wrote: > On 10/20/20 2:46 PM, Peter Krempa wrote: >> On Tue, Oct 20, 2020 at 12:27:27 +0200, Michal Privoznik wrote: >>> Some completers for libvirt related tools might want to list >>> domain IDs only. Just like the one I've implemented for >>> virt-viewer [1]. I've worked around it using some awk magic, >>> but if it was possible to just 'virsh list --id' then I could >>> drop awk. >> >> IMO completing numeric IDs doesn't make much sense, they aren't >> descriptive at all and I don't really see a point for users using them >> on a commandline. If you are expanding both names and IDs then you'll >> have twice as much completion suggestions on an empty string. >> >> Is there a case where it would actually make sense? Specifically in >> virsh we almost always accept id/name/UUID interchangably for a >> 'domain'. >> > > As I'm saying in the commit message - virt-viewer accepts --id, I don't > expect ID completer to ever be implemented for virsh because as you say, > domnames and/or uuids are accepted universally. Okay, I've seen that you've mentioned the completer for virt-viewer but I didn't realize it has an explicit --id. It makes sense though since VM name allows numeric names, so if a completer suggests both names and ids it might end up very confusing.

A potential alternative resolution to my other reply reviewing the code would be to make 'virsh list --id' mutually exclusive with '--name' or '--uuid'. That would make it usable with a completer completing IDs and wouldn't hopefully give anyone false ideas of using it to fetch all 3 identifiers for completion.