Validate mac address on Hardware spec:

This only allows lower case mac addresses.
This simplifies matching/looking up mac addresses.
Without this values could be upper case or mixed case.
Upper case and mixed cases will cause clients to miss
lookups if using the wrong case. This standardized to lowercase
to remove this error prone interaction.

Signed-off-by: Jacob Weinstock <[email protected]>

pkg/apis/core/v1alpha1/hardware_types.go

@@ -31,6 +31,7 @@ type HardwareList struct {
 // +kubebuilder:resource:path=hardware,scope=Namespaced,categories=tinkerbell,singular=hardware,shortName=hw
 // +kubebuilder:storageversion
 // +kubebuilder:printcolumn:JSONPath=".status.state",name=State,type=string
+// +kubebuilder:validation:JSONPath=".spec.interfaces.dhcp.mac":Pattern=([0-9a-f]{2}[:]){5}([0-9a-f]{2})
 
 // Hardware is the Schema for the Hardware API.
 type Hardware struct {