Clusterfile and other Object Validation

[fanux]

https://book.kubebuilder.io/reference/markers/crd-validation.html

Example:

// BackupCronJobSpec defines the desired state of BackupCronJob
type BackupCronJobSpec struct {
	// Important: Run "make" to regenerate code after modifying this file

	// InstanceName is the backup target instance name, usually a
	// resource object name
	// +kubebuilder:validation:MinLength=1
	InstanceName string `json:"instanceName"`
	// InstanceKind is the backup target kind, i.e., 'StatefulSet' or
	// custom resource kind
	// +kubebuilder:validation:MinLength=1
	InstanceKind string `json:"instanceKind"`
	// InstanceAPIGroup is the backup target API group, i.e., 'apps' for
	// StatefulSet or custom resource API group
	// +optional
	InstanceAPIGroup string `json:"instanceAPIGroup,omitempty"`
	// InstanceAPIVersion is the backup target API version, i.e., 'apps/v1'
	// would be 'v1'
	// +kubebuilder:validation:MinLength=1
	InstanceAPIVersion string `json:"instanceAPIVersion"`
	// Schedule is a Cron expression defining when to run
	// the Backup
	// +kubebuilder:validation:Pattern=`(@(annually|yearly|monthly|weekly|daily|hourly))|(@every (\d+(m|h))+)|((((\d+,)+\d+|(\d+(\/|-)\d+)|\d+|\*) ?){5})`
	Schedule string `json:"schedule"`
	// TTL is a time.Duration-parseable string describing how long
	// the Backup should be retained for, i.e., 1d0h, minimum TTL is 1h.
	// +kubebuilder:validation:Pattern=`(?:\s*\d+\s*[YyMmDdHh])+`
	TTL string `json:"ttl"`
	// Repos is backup storage repo name
	// +optional
	// +kubebuilder:validation:Optional
	Repo string `json:"repo,omitempty"`
	// Hooks represent custom behaviors that should be executed at different phases of the backup.
	// +optional
	Hooks velerov1.BackupHooks `json:"hooks,omitempty"`
}

// SchedulePhase is a string representation of the lifecycle phase
// of an OPCC backupcronjob
// +kubebuilder:validation:Enum=New;Enabled;FailedValidation
type SchedulePhase string

const (
	// SchedulePhaseNew means the schedule has been created but not
	// yet processed by the ScheduleController
	SchedulePhaseNew SchedulePhase = "New"

	// SchedulePhaseEnabled means the schedule has been validated and
	// will now be triggering backups according to the schedule spec.
	SchedulePhaseEnabled SchedulePhase = "Enabled"

	// SchedulePhaseFailedValidation means the schedule has failed
	// the controller's validations and therefore will not trigger backups.
	SchedulePhaseFailedValidation SchedulePhase = "FailedValidation"
)