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from __future__ import annotations
import subprocess
import uuid
from pathlib import Path
from .config import UPLOAD_DIR
from .log import get_logger
_LOG = get_logger(__name__)
class LinuxVM:
"""Manage a lightweight Linux VM using Docker."""
def __init__(
self, image: str = "ubuntu:latest", host_dir: str = UPLOAD_DIR
) -> None:
self._image = image
self._name = f"chat-vm-{uuid.uuid4().hex[:8]}"
self._running = False
self._host_dir = Path(host_dir)
self._host_dir.mkdir(parents=True, exist_ok=True)
def start(self) -> None:
"""Start the VM if it is not already running."""
if self._running:
return
try:
subprocess.run(
["docker", "pull", self._image],
check=False,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=True,
)
subprocess.run(
[
"docker",
"run",
"-d",
"--name",
self._name,
"-v",
f"{self._host_dir}:/data",
self._image,
"sleep",
"infinity",
],
check=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=True,
)
self._running = True
except Exception as exc: # pragma: no cover - runtime failures
_LOG.error("Failed to start VM: %s", exc)
raise RuntimeError(f"Failed to start VM: {exc}") from exc
def execute(self, command: str, *, timeout: int = 3) -> str:
"""Execute a command inside the running VM."""
if not self._running:
raise RuntimeError("VM is not running")
try:
completed = subprocess.run(
[
"docker",
"exec",
self._name,
"bash",
"-lc",
command,
],
capture_output=True,
text=True,
timeout=timeout,
)
except subprocess.TimeoutExpired as exc:
return f"Command timed out after {timeout}s: {exc.cmd}"
except Exception as exc: # pragma: no cover - unforeseen errors
return f"Failed to execute command: {exc}"
output = completed.stdout
if completed.stderr:
output = f"{output}\n{completed.stderr}" if output else completed.stderr
return output.strip()
def stop(self) -> None:
"""Terminate the VM if running."""
if not self._running:
return
subprocess.run(
["docker", "rm", "-f", self._name],
check=False,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
text=True,
)
self._running = False
def __enter__(self) -> "LinuxVM":
self.start()
return self
def __exit__(self, exc_type, exc, tb) -> None:
self.stop()
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