"""Start a kernel from source without writing __pycache__.

A script is compiled from source each time it starts; a module loads its
cached bytecode. The kernel is long, so this keeps about 4 MB of compile
work out of every kernel's memory.

With `--run <dir>` the daemon starts this file directly: it leaves the
daemon's session and sends what it writes before its own output capture
starts to `<dir>/kernel.log`.
"""

import os
import sys

if sys.argv[1:2] == ["--run"]:
    if os.getpgrp() != os.getpid():
        os.setsid()
    os.makedirs(sys.argv[2], mode=0o700, exist_ok=True)
    log = os.open(
        os.path.join(sys.argv[2], "kernel.log"),
        os.O_WRONLY | os.O_CREAT | os.O_APPEND,
        0o600,
    )
    os.dup2(log, 2)
    os.close(log)

import albedo_cells  # noqa: E402

albedo_cells.main()