Function ParseAutoExitNodeString

ipn/prefs.go:1171–1176

ParseAutoExitNodeString attempts to parse the given string as an [ExitNodeExpression]. It returns the parsed expression and true on success, or an empty string and false if the input does not appear to be an [ExitNodeExpression] (i.e., it doesn't start with "auto:"). It is mainly used to parse the

(s T)

// It is mainly used to parse the [syspolicy.ExitNodeID] value
// when it is set to "auto:<expression>" (e.g., auto:any).
func ParseAutoExitNodeString[T ~string](s T) (_ ExitNodeExpression, ok bool) {
	if expr, ok := strings.CutPrefix(string(s), AutoExitNodePrefix); ok && expr != "" {
		return ExitNodeExpression(expr), true
	}
	return "", false
}