When checking file/dir existence, manage all errors #26
Description
It only happened once, when testing wolfi as docker base: the mounting of resources in docker was somehow faulty, and this code:
func fileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}(also the similar dirExists right below) would panic with a "pointer dereference", because there was an err not of the "right" type and it wasn't caught, so info was nil. Give a fault and exit if this happen, so that the reason is more evident.