func detectOS(data map[string][]byte, parent *database.Layer) (detectedOS string, err error) {
detectedOS = detectors.DetectOS(data)
// Attempt to detect the OS from the parent layer.
if detectedOS == "" && parent != nil {
detectedOS, err = parent.OperatingSystem()
if err != nil {
return "", err
}
}
// If the detectedOS is not in the supported OS list, the OS is unsupported.
if detectedOS != "" {
isSupported := false
for _, osPrefix := range SupportedOS {
if strings.HasPrefix(detectedOS, osPrefix) {
isSupported = true
break
}
}
if !isSupported {
return "", ErrUnsupported
}
}
return
}
