Method mount

pex/environment.py:220–244

(
        cls,
        pex,  # type: str
        pex_info=None,  # type: Optional[PexInfo]
        target=None,  # type: Optional[Target]
    )

    @classmethod
    def mount(
        cls,
        pex,  # type: str
        pex_info=None,  # type: Optional[PexInfo]
        target=None,  # type: Optional[Target]
    ):
        # type: (...) -> PEXEnvironment
        pex_file = os.path.realpath(pex)
        if not pex_info:
            pex_info = PexInfo.from_pex(pex_file)
            pex_info.update(PexInfo.from_env())
        pex_hash = pex_info.pex_hash
        if pex_hash is None:
            raise AssertionError(
                "There was no pex_hash stored in {} for {}.".format(PexInfo.PATH, pex)
            )
        target = target or targets.current()
        key = (pex_file, pex_hash, target)
        mounted = cls._CACHE.get(key)
        if mounted is None:
            pex_root = pex_info.pex_root
            installed_pex = ensure_installed(pex=pex, pex_root=pex_root, pex_hash=pex_hash)
            mounted = cls(pex=installed_pex, pex_info=pex_info, target=target, source_pex=pex)
            cls._CACHE[key] = mounted
        return mounted

    def __init__(
        self,