XARs are just self mounting compressed readonly filesystems with an executable inside. We get hermitic dependencies by setting the PYTHONPATH, LD_LIBRARY_PATH a

XARs are just self mounting compressed readonly filesystems with an executable inside. We get hermitic dependencies by setting the PYTHONPATH, LD_LIBRARY_PATH and such in the bootstrapping script. One big benefit is that the filesystem only decompresses the pages as needed, which greatly improves the start up time over existing solutions.