wait

type Preparer struct {
	// the shell interpreter that will be used for your scripts. `/bin/sh` is
	// used by default.
	Interpreter string `hcl:"interpreter"`

	// the script to run to check if a resource is ready. exit with exit code 0 if
	// the resource is healthy, and 1 (or above) otherwise.
	Check string `hcl:"check" required:"true" nonempty:"true"`

	// flags to pass to the `interpreter` binary to check validity. For
	// `/bin/sh` this is `-n`.
	CheckFlags []string `hcl:"check_flags"`

	// flags to pass to the interpreter at execution time.
	ExecFlags []string `hcl:"exec_flags"`

	// the amount of time the command will wait before halting forcefully.
	Timeout *time.Duration `hcl:"timeout"`

	// the working directory this command should be run in.
	Dir string `hcl:"dir"`

	// any environment variables that should be passed to the command.
	Env map[string]string `hcl:"env"`

	// the amount of time to wait in between checks. If the interval is not
	// specified, it will default to 5 seconds.
	Interval *time.Duration `hcl:"interval"`

	// the amount of time to wait before running the first check and after a
	// successful check. If no grace period is specified, no grace period will be
	// taken into account.
	GracePeriod *time.Duration `hcl:"grace_period"`

	// the maximum number of attempts before the wait fails. If the maximum number
	// of retries is not set, it will default to 5.
	MaxRetry *int `hcl:"max_retry"`
}

type Retrier struct {
	GracePeriod time.Duration
	Interval    time.Duration
	MaxRetry    int
	RetryCount  int
	Duration    time.Duration
}

type RetryFunc func() (bool, error)

type Wait struct {
	*shell.Shell
	*Retrier
}