Mirror all the missing images which are in `ImagePullBackOff` state in the cluster.

mirror-missing-images.sh

#!/bin/bash

function identifyImages() {
    export KUBECONFIG=/root/.kcli/clusters/hub-ipv6/auth/kubeconfig
    > imagesToMirror.txt
    IFS=$'\n'
    for image in $(oc get pod -A -o yaml | grep "Back-off pulling image"); do
        extractedImage=$(echo "$image" | grep -o '"[^"]*"')
	finalImage=$(echo "$extractedImage" | cut -d '"' -f 2)
	echo $finalImage >> $filename
    done
}

filename="imagesToMirror.txt"
identifyImages

if [ ! -f "$filename" ]; then
    echo "The file '$filename' does not exists"
    exit 1
fi


while IFS= read -r line; do
    echo "-----> Image: $line"
    skopeo copy --all docker://${line} docker://${REGISTRY}/${line#*/}
    echo "-----> Copied!"
done < "$filename"

This script needs only the KUBECONFIG of the Disconnected openshift cluster and the skopeo tool.
It will mirror all the missing images that the cluster is trying to raise up and it couldn't.