71 lines
2.0 KiB
Python
71 lines
2.0 KiB
Python
"""Host-side raw-mode wrapper for `container exec --interactive --tty`.
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Apple's `container exec --interactive --tty` does not set the host terminal to
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raw mode before starting its I/O relay. Without raw mode the kernel line
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discipline buffers modifier-key escape sequences (e.g. Shift+Enter in
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modifyOtherKeys mode produces \\x1b[13;2~) until a carriage-return arrives, so
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they never reach Claude Code inside the container.
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This module sets the host terminal to raw mode, spawns the inner argv (the
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container exec command), and restores the original terminal attributes on
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exit. When stdin is not a TTY (piped invocations, CI) it falls through to a
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bare subprocess.run so callers do not need to special-case non-interactive
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contexts.
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Usage (the `--` separator is the API contract — everything after it is the
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inner command):
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python pty_forward.py -- container exec --interactive --tty <name> <cmd>
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"""
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from __future__ import annotations
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import os
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import subprocess
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import sys
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import termios
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import tty
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def _inner_env() -> dict[str, str]:
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env = dict(os.environ)
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env.setdefault("TERM", "xterm-256color")
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return env
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def _run_inner(inner: list[str]) -> int:
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return subprocess.run(inner, check=False, env=_inner_env()).returncode
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def main(argv: list[str]) -> int:
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"""Entry point. ``argv`` shape: ``-- <inner-argv...>``."""
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if len(argv) < 2 or argv[0] != "--":
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sys.stderr.write(
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"usage: python pty_forward.py -- <container-exec-argv...>\n"
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)
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return 2
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inner = argv[1:]
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try:
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fd = sys.stdin.fileno()
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except OSError:
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return _run_inner(inner)
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if not os.isatty(fd):
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return _run_inner(inner)
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try:
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old = termios.tcgetattr(fd)
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except termios.error:
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return _run_inner(inner)
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try:
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tty.setraw(fd)
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return _run_inner(inner)
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finally:
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termios.tcsetattr(fd, termios.TCSADRAIN, old)
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if __name__ == "__main__":
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sys.exit(main(sys.argv[1:]))
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