kubernetes/cmd/kubeadm/app/util/arguments.go

// ArgumentsToCommand takes two Arg slices, one with the base arguments and one
// with optional override arguments. In the return list override arguments will precede base
// arguments. If an argument is present in the overrides, it will cause
// all instances of the same argument in the base list to be discarded, leaving
// only the instances of this argument in the overrides to be applied.
func ArgumentsToCommand(base []kubeadmapi.Arg, overrides []kubeadmapi.Arg) []string { … }

// ArgumentsFromCommand parses a CLI command in the form "--foo=bar" to an Arg slice.
// This function's primary purpose is to parse the kubeadm-flags.env file, but can remain unused
// for some releases.
func ArgumentsFromCommand(command []string) []kubeadmapi.Arg { … }

// parseArgument parses the argument "--foo=bar" to "foo" and "bar"
func parseArgument(arg string) (string, string, error) { … }