Function validate_entry_point

pex/pex.py:900–930

(
    pex,  # type: PEX
    entry_point,  # type: str
)

def validate_entry_point(
    pex,  # type: PEX
    entry_point,  # type: str
):
    # type: (...) -> None

    try:
        ep = parse_entry_point(entry_point)
    except ValueError as e:
        raise PEX.InvalidEntryPoint(
            "Failed to parse `{entry_point}`: {err}".format(entry_point=entry_point, err=e)
        )

    if isinstance(ep, ModuleEntryPoint):
        import_statement = "import {module}".format(module=ep.module)
    else:
        import_statement = "from {module} import {method}".format(
            module=ep.module, method=ep.attrs[0]
        )

    with named_temporary_file() as fp:
        fp.write(import_statement.encode("utf-8"))
        fp.close()
        retcode = pex.run([fp.name], env={"PEX_INTERPRETER": "1"})
        if retcode != 0:
            raise PEX.InvalidEntryPoint(
                "Invalid entry point: `{entry_point}`\n"
                "Entry point verification failed: `{import_statement}`".format(
                    entry_point=entry_point, import_statement=import_statement
                )
            )