func backwardCompatibleAccessModes()

in plugins/gce_pd.go [129:161]

• 25 lines of code
• 8 McCabe index (conditional complexity)

func backwardCompatibleAccessModes(ams []v1.PersistentVolumeAccessMode) []v1.PersistentVolumeAccessMode {
	if ams == nil {
		return nil
	}

	s := map[v1.PersistentVolumeAccessMode]bool{}
	var newAM []v1.PersistentVolumeAccessMode

	for _, am := range ams {
		if am == v1.ReadWriteMany {
			// ReadWriteMany is unsupported in CSI, but in-tree did no
			// validation and treated it as ReadWriteOnce
			s[v1.ReadWriteOnce] = true
		} else {
			s[am] = true
		}
	}

	switch {
	case s[v1.ReadOnlyMany] && s[v1.ReadWriteOnce]:
		// ROX,RWO is unsupported in CSI, but in-tree did not validation and
		// treated it as ReadWriteOnce
		newAM = []v1.PersistentVolumeAccessMode{v1.ReadWriteOnce}
	case s[v1.ReadWriteOnce]:
		newAM = []v1.PersistentVolumeAccessMode{v1.ReadWriteOnce}
	case s[v1.ReadOnlyMany]:
		newAM = []v1.PersistentVolumeAccessMode{v1.ReadOnlyMany}
	default:
		newAM = []v1.PersistentVolumeAccessMode{v1.ReadWriteOnce}
	}

	return newAM
}