ash script is divided into 2 files: common code (ashpk_core.py) and distro specific code (i.e gentoo.py). Note that neither of these files can be run standalone (import one script into the other is not intended). The division is just to ease using files as templates in developing Ash for other distributions. At the time of installing a distro, the two files are simply concatenated.
将快照克隆为新的快照树：