Re: [Xen-devel] xl command autocompletion: domain names

[Matthew Daley <mattjd@xxxxxxxxx>]

On Thu, Nov 7, 2013 at 12:16 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Thu, 2013-11-07 at 00:14 +1300, Matthew Daley wrote:
>> On Wed, Nov 6, 2013 at 11:03 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
>> wrote:
>> > On Wed, 2013-11-06 at 13:18 +1300, Matthew Daley wrote:
>> >
>> >> >> On Fri, Nov 1, 2013 at 4:03 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
>> >> >> wrote:
>> >> >> > I don't necessarily object to setting the process title, it feels a 
>> >> >> > bit
>> >> >> > 1980s/sendmail-ish to me but that might just be me ;-)
>> >> >
>> >> > Right.
>> >> >
>> >> >> Can't say I have 80s UNIX experience ;)
>> >> >
>> >> > The problem with it from my point of view is that it's very difficult
>> >> > to make it reliable.  I don't mind setting the title for the benefit
>> >> > of admins, but automatically grepping processes out of ps listings is
>> >> > pretty poor and shouldn't be done in bash-completion IMO.
>> >>
>> >> A quick grep through the existing bash-completion scripts doesn't show
>> >> any uses of ps, so that is in your favour. I guess I'll can this idea
>> >> for getting the names for now then. The thing is, a completion script
>> >> for xl that doesn't handle domain names seems a little pointless...
>> >
>> > I presume it does handle it if you use "sudo -s" or su and run the
>> > commands actually as root? If so then it's not a total waste.
>>
>> Which "it" are we talking about here?
>
> "it" is the (perhaps future) bash completion.
>
>>  If you mean a xl bash-completion
>> script, well, that's still vapourware right now :) I wanted to try and
>> figure something out with these domain names first before diving into
>> the script since the script itself should be pretty simple AFAICT.
>>
>> Using sudo -s would still have issues, since the completion still runs
>> as the unprivileged shell user.
>
> sudo -s opens a root shell....

Oh, I thought you were talking about completing a command line
starting with sudo -s (which I guess is pointless wrt. xl). Then yes,
using the shell from sudo -s would be fine.

- Matthew

>
>>  su'ing as root would work fine, but
>> one isn't supposed to be sitting in shells as root all day, no?
>
> True.
>
>> > libxl probably leaves some per-domain droppings in /var and such, but I
>> > don't think we'd want to expose that.
>>
>> Right. The only other idea I've not mentioned yet would be to
>> explicitly define a file in /var or wherever which enumerated the
>> currently running domains (created by xl), but IMO that's silly
>> duplication of information which is just asking for trouble wrt.
>> synchronization with reality.
>
> Agreed.
>
> Ian.
>

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