Create a YAML mapping file for CloudFormation to select a CentOS AMI

update-centos-amis.sh

#!/bin/bash

(
cat <<EOF
Mappings:
  CentOSRegionImages:
EOF

curl -s 'https://wiki.centos.org/Cloud/AWS' | xmllint -html --xpath '//table[1]/tbody/tr' - | perl -nle '
        m|CentOS Linux (\d+)| and $version=$1;
        m|>\s*(\w{2}-\w+-\d)| and $region=$1;
        m|>\s*(ami-\w+)| and $amis{$region}->{"centos$version"} = $1;
        END { 
                for my $region (keys %amis) { 
                        print "    $region: { ". join(", ", map { "$_: \"".$amis{$region}->{$_}."\"" } (keys %{$amis{$region}})) . " }";
                }
        }' | sort
) > centos-images.yaml