Fetch Docker images with Skopeo

fetch.sh

#!/bin/bash

IMAGES="jboss-eap-7/eap70-openshift openshift3/jenkins-2-rhel7 openshift3/jenkins-slave-maven-rhel7 openshift3/jenkins-slave-nodejs-rhel7 dotnet/dotnet-20-jenkins-slave-rhel7 openshift3/jenkins-slave-base-rhel7 rhscl/mongodb-34-rhel7 rhscl/mysql-57-rhel7 rhscl/mariadb-102-rhel7 rhscl/postgresql-96-rhel7 rhscl/nodejs-6-rhel7 rhscl/s2i-base-rhel7 openshift3/apb-base rhel7-atomic rhel7 rhscl/ruby-24-rhel7 rhscl/perl-524-rhel7 rhscl/python-27-rhel7 rhscl/python-36-rhel7 redhat-sso-7/sso71-openshift"

for i in $IMAGES; do
  file="$(echo $i|tr '/' '_').tar"
  if [ ! -f "$file" -a ! -f "$file.gz" ]; then
    echo "Fetching $i... into $file..."
    skopeo copy docker://registry.access.redhat.com/$i:latest docker-archive://$PWD/$file:$i:latest
  fi
  if [ -f "$file" -a ! -f "$file.gz" ]; then
    echo "Compressing $file..."
    gzip "$file"
  fi
  
done