https://github.com/UCL-INGI/INGInious/blob/8415b6a1181a55fd30123c7d72bfd9488bdc798e/inginious/common/filesystems/local.py#L146 maybe we should use copy2 instead of copyfile.
https://github.com/UCL-INGI/INGInious/blob/8415b6a1181a55fd30123c7d72bfd9488bdc798e/inginious/common/filesystems/local.py#L146
maybe we should use copy2 instead of copyfile.