Re: [Xen-devel] drjones@xxxxxxxxxx, vkuznets@xxxxxxxxxx, leiwang@xxxxxxxxxx, wshi@xxxxxxxxxx

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 04/24/2014 10:32 AM, Ian Campbell wrote:
> On Thu, 2014-04-24 at 10:01 +0100, George Dunlap wrote:
> > On 04/24/2014 09:44 AM, Ian Campbell wrote:
> > > On Thu, 2014-04-24 at 08:14 +0800, Lingfei Kong wrote:
> > > > Maybe another solution is to change the xl command to adapt this.
> > > Feel free to propose a patch but I suspect this would involve too much
> > > surgery to the config file parser.
> > >
> > > >    On
> > > > RHEL5 xen hypervisor, I can create a guest with `xm create hvm.cfg
> > > > cpus="0-3"`. As a user I prefer this method, because this will be
> > > > consistent with it's config file and it is strange to use ' to enclose
> > > > the parameters.
> > > That is perfectly normal shell quoting behaviour, nothing strange about
> > > it IMHO.
> > Well having the config file syntax include quotes and brackets is
> > natural.  The fact that the shell interprets quotes and brackets is also
> > natural.  But the combination of the two leads to a rather unexpected
> > and clunky user interface.
> This happens all the time though, "in find -exec foo \;" in sed and perl
> -e etc etc. It's just the way Unix shells work.
Maybe it would be more clear then, rather than saying "key=value pairs" 
in the man page, to say "a config file snippet"?  That might put people 
in the mindset of thinking more like "perl -e".
> > Unfortunately I'm not sure what we can really do at this point to
> > maintain the general flexibility while avoiding backticks.
> Hang on, how did we end up with backticks here? I think you just means
> normal quotes?
Actually I have no idea where that came from... you get the main idea 
though -- escape sequences or single quotes.
 -George


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