pkg/operator: version the osImageURL CM

This patch also guards against unversioned osImageURL config maps in the
future.

Signed-off-by: Antonio Murdaca <runcom@linux.com>

install/0000_80_machine-config-operator_05_osimageurl.yaml

@@ -4,6 +4,7 @@ metadata:
   name: machine-config-osimageurl
   namespace: openshift-machine-config-operator
 data:
+  releaseVersion: 0.0.1-snapshot
   # The OS payload, managed by the daemon + pivot + rpm-ostree
   # https://github.com/openshift/machine-config-operator/issues/183
   osImageURL: "registry.svc.ci.openshift.org/openshift:machine-os-content"

pkg/operator/sync.go

@@ -686,6 +686,11 @@ func (optr *Operator) getOsImageURL(namespace string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	releaseVersion := cm.Data["releaseVersion"]
+	optrVersion, _ := optr.vStore.Get("operator")
+	if releaseVersion != optrVersion {
+		return "", fmt.Errorf("refusing to read osImageURL version %q, operator version %q", releaseVersion, optrVersion)
+	}
 	return cm.Data["osImageURL"], nil
 }