private File createMetaDir() {
        File metaDir = getMetaDir();
        if (!metaDir.exists()) {
            log.log(Level.FINE, () -> "Creating meta dir " + metaDir);
            metaDir.mkdirs();
        }
        return metaDir;
    }
@author Ulf Lilleengen
@author Vegard Havdal
config-application-package/src/main/java/com/yahoo/config/model/application/provider/FilesApplicationFile.java