Get the RHCOS version for each OCP version

get_RHCOS_version.sh

#!/bin/bash
if [ -z "$CHANNEL" ]
then
    echo Provide the channel via \'export CHANNEL=stable-4.x\'
    exit 1
fi

rm -f version_maps &> /dev/null

VERSIONS=$(curl -sH 'Accept: application/json'  "https://api.openshift.com/api/upgrades_info/v1/graph?channel=${CHANNEL}" | jq '.nodes[].version' -r)

for VERSION in ${VERSIONS}
do
    RHCOSVERSION="$(oc adm release info "${VERSION}" -o 'jsonpath={.displayVersions.machine-os.Version}')"
    echo "$VERSION - $RHCOSVERSION" | tee -a ./version_maps
done

echo OpenShift to RHCOS version mapping is in 'version_map