Re: [Xen-devel] [OSSTEST PATCH RFC v1 08/12] ts-xen-install: install Xen with XSM support if requested

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Sep 24, 2014 at 11:41:34AM +0100, Ian Campbell wrote:
> On Mon, 2014-09-22 at 15:11 +0100, Wei Liu wrote:
> > +                'find /boot -name \'xenpolicy-*\' -exec basename {} \;');
> 
> (stray tabs)
> 
> > +   # there should only be one xenpolicy file for a clean install
> > +   my $c = () = $flaskpolicy =~ /xenpolicy/g;
> 
> I'm curious, what does that () do?
> 

This is called "empty parentheses" idiom. It's used to force list
context on an expression, and yet return a scalar: the count of items in
that list.

http://www.perlmonks.org/?node_id=527973

> Does the grub patch thing work on arm (where I'm not sure if grub will
> be there or not)?
> 

No. AIUI arm doesn't use grub, does it?

Wei.

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