Understanding webhook injector

Contributors
1

Hello,

I’m trying to understand istio webhook injector and how it injects sidecar here, I had some difficulties to understand what’s happen in the following block on the AddContainer func
Can anyone please explain to me the general idea ( e.g what’s the idea behind this first := len(target) == 0 and what does it mean “/-” )

first := len(target) == 0
	var value interface{}
	for _, add := range added {
		value = add
		path := basePath
		if first {
			first = false
			value = []corev1.Volume{add}
		} else {
			path += "/-"
		}

Thanks for your help!