Re: [Xen-devel] [PATCH 5/5] hotplug/linux: Add IPv6 support to vif-route

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2014-05-20 at 10:06 +0200, Sylvain Munaut wrote:
> >> +##
> >> +# ip6_of interface
> >> +#
> >> +# Print the first IPv6 address currently in use at the given interface, 
> >> or nothing if
> >> +# the interface is not up.
> >> +#
> >> +ip6_of()
> >> +{
> >> +        ip -6 addr show primary dev "$1" | perl -wane '/scope global/ && 
> >> /inet6 (([0-9a-f]+:*)+)/ && print $1;'
> >
> > Hrm, Perl again. Can this be done with awk? Looks tricky though.
> >
> 
> Changed to :
> 
> ip -6 -o addr show primary dev "$1" scope global | awk '$3 == "inet6"
> {split($4,i,"/"); print i[1]; exit}'
> 
> which is now very similar to the ip_of() function.

thanks.

In theory I think this could be combined into a single helper which took
$2 == '4' or '6' and "ip -$2 | ... inet${2%4}.." (then ip_of and ip6_of
become invocations of that)

But perhaps the ${2%4} bit is overly cryptic?

Ian.


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