kubernetes/cmd/kube-controller-manager/app/options/csrsigningcontroller.go

type CSRSigningControllerOptions …

// AddFlags adds flags related to CSRSigningController for controller manager to the specified FlagSet.
func (o *CSRSigningControllerOptions) AddFlags(fs *pflag.FlagSet) { … }

// ApplyTo fills up CSRSigningController config with options.
func (o *CSRSigningControllerOptions) ApplyTo(cfg *csrsigningconfig.CSRSigningControllerConfiguration) error { … }

// Validate checks validation of CSRSigningControllerOptions.
func (o *CSRSigningControllerOptions) Validate() []error { … }

// both must be specified or both must be empty
func csrSigningFilesValid(config csrsigningconfig.CSRSigningConfiguration) error { … }