from __future__ import annotations

import io
import tarfile
from typing import Tuple

def exec_shell(container, cmd: str) -> Tuple[int, str]:
    for shell in (["sh", "-lc"], ["bash", "-lc"]):
        try:
            res = container.exec_run(shell + [cmd], demux=False)
            out = res.output.decode(errors="ignore") if isinstance(res.output, (bytes, bytearray)) else str(res.output)
            return res.exit_code, out
        except Exception:
            continue
    return 127, ""


def read_text_from_container(container, abs_path: str, max_bytes: int = 800_000) -> str:
    stream, _stat = container.get_archive(abs_path)
    buf = io.BytesIO()
    for chunk in stream:
        buf.write(chunk)
        if buf.tell() > max_bytes:
            break
    buf.seek(0)

    with tarfile.open(fileobj=buf) as tar:
        members = tar.getmembers()
        if not members:
            raise FileNotFoundError(abs_path)
        f = tar.extractfile(members[0])
        if f is None:
            raise FileNotFoundError(abs_path)
        return f.read().decode(errors="ignore")