mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-04 21:03:15 +00:00
1256 lines
42 KiB
Python
1256 lines
42 KiB
Python
import base64
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import io
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import os
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import queue
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import re
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import select
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import shlex
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import shutil
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import socket
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import subprocess
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import sys
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import tempfile
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import threading
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import time
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from contextlib import _GeneratorContextManager, nullcontext
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from pathlib import Path
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from queue import Queue
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from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple
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from test_driver.logger import rootlog
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from .qmp import QMPSession
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CHAR_TO_KEY = {
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"A": "shift-a",
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"N": "shift-n",
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"-": "0x0C",
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"_": "shift-0x0C",
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"B": "shift-b",
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"O": "shift-o",
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"=": "0x0D",
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"+": "shift-0x0D",
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"C": "shift-c",
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"P": "shift-p",
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"[": "0x1A",
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"{": "shift-0x1A",
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"D": "shift-d",
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"Q": "shift-q",
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"]": "0x1B",
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"}": "shift-0x1B",
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"E": "shift-e",
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"R": "shift-r",
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";": "0x27",
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":": "shift-0x27",
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"F": "shift-f",
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"S": "shift-s",
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"'": "0x28",
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'"': "shift-0x28",
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"G": "shift-g",
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"T": "shift-t",
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"`": "0x29",
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"~": "shift-0x29",
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"H": "shift-h",
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"U": "shift-u",
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"\\": "0x2B",
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"|": "shift-0x2B",
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"I": "shift-i",
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"V": "shift-v",
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",": "0x33",
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"<": "shift-0x33",
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"J": "shift-j",
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"W": "shift-w",
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".": "0x34",
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">": "shift-0x34",
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"K": "shift-k",
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"X": "shift-x",
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"/": "0x35",
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"?": "shift-0x35",
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"L": "shift-l",
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"Y": "shift-y",
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" ": "spc",
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"M": "shift-m",
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"Z": "shift-z",
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"\n": "ret",
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"!": "shift-0x02",
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"@": "shift-0x03",
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"#": "shift-0x04",
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"$": "shift-0x05",
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"%": "shift-0x06",
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"^": "shift-0x07",
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"&": "shift-0x08",
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"*": "shift-0x09",
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"(": "shift-0x0A",
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")": "shift-0x0B",
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}
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def make_command(args: list) -> str:
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return " ".join(map(shlex.quote, (map(str, args))))
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def _perform_ocr_on_screenshot(
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screenshot_path: str, model_ids: Iterable[int]
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) -> List[str]:
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if shutil.which("tesseract") is None:
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raise Exception("OCR requested but enableOCR is false")
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magick_args = (
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"-filter Catrom -density 72 -resample 300 "
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+ "-contrast -normalize -despeckle -type grayscale "
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+ "-sharpen 1 -posterize 3 -negate -gamma 100 "
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+ "-blur 1x65535"
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)
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tess_args = "-c debug_file=/dev/null --psm 11"
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cmd = f"convert {magick_args} '{screenshot_path}' 'tiff:{screenshot_path}.tiff'"
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ret = subprocess.run(cmd, shell=True, capture_output=True)
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if ret.returncode != 0:
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raise Exception(f"TIFF conversion failed with exit code {ret.returncode}")
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model_results = []
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for model_id in model_ids:
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cmd = f"tesseract '{screenshot_path}.tiff' - {tess_args} --oem '{model_id}'"
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ret = subprocess.run(cmd, shell=True, capture_output=True)
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if ret.returncode != 0:
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raise Exception(f"OCR failed with exit code {ret.returncode}")
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model_results.append(ret.stdout.decode("utf-8"))
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return model_results
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def retry(fn: Callable, timeout: int = 900) -> None:
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"""Call the given function repeatedly, with 1 second intervals,
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until it returns True or a timeout is reached.
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"""
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for _ in range(timeout):
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if fn(False):
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return
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time.sleep(1)
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if not fn(True):
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raise Exception(f"action timed out after {timeout} seconds")
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class StartCommand:
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"""The Base Start Command knows how to append the necessary
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runtime qemu options as determined by a particular test driver
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run. Any such start command is expected to happily receive and
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append additional qemu args.
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"""
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_cmd: str
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def cmd(
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self,
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monitor_socket_path: Path,
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qmp_socket_path: Path,
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shell_socket_path: Path,
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allow_reboot: bool = False,
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) -> str:
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display_opts = ""
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display_available = any(x in os.environ for x in ["DISPLAY", "WAYLAND_DISPLAY"])
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if not display_available:
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display_opts += " -nographic"
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# qemu options
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qemu_opts = (
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" -device virtio-serial"
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# Note: virtconsole will map to /dev/hvc0 in Linux guests
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" -device virtconsole,chardev=shell"
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" -device virtio-rng-pci"
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" -serial stdio"
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)
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if not allow_reboot:
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qemu_opts += " -no-reboot"
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# TODO: qemu script already catpures this env variable, legacy?
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qemu_opts += " " + os.environ.get("QEMU_OPTS", "")
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return (
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f"{self._cmd}"
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f" -qmp unix:{qmp_socket_path},server=on,wait=off"
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f" -monitor unix:{monitor_socket_path}"
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f" -chardev socket,id=shell,path={shell_socket_path}"
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f"{qemu_opts}"
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f"{display_opts}"
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)
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@staticmethod
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def build_environment(
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state_dir: Path,
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shared_dir: Path,
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) -> dict:
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# We make a copy to not update the current environment
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env = dict(os.environ)
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env.update(
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{
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"TMPDIR": str(state_dir),
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"SHARED_DIR": str(shared_dir),
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"USE_TMPDIR": "1",
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}
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)
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return env
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def run(
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self,
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state_dir: Path,
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shared_dir: Path,
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monitor_socket_path: Path,
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qmp_socket_path: Path,
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shell_socket_path: Path,
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allow_reboot: bool,
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) -> subprocess.Popen:
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return subprocess.Popen(
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self.cmd(
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monitor_socket_path, qmp_socket_path, shell_socket_path, allow_reboot
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),
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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shell=True,
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cwd=state_dir,
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env=self.build_environment(state_dir, shared_dir),
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)
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class NixStartScript(StartCommand):
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"""A start script from nixos/modules/virtualiation/qemu-vm.nix
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that also satisfies the requirement of the BaseStartCommand.
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These Nix commands have the particular characteristic that the
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machine name can be extracted out of them via a regex match.
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(Admittedly a _very_ implicit contract, evtl. TODO fix)
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"""
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def __init__(self, script: str):
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self._cmd = script
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@property
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def machine_name(self) -> str:
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match = re.search("run-(.+)-vm$", self._cmd)
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name = "machine"
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if match:
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name = match.group(1)
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return name
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class Machine:
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"""A handle to the machine with this name, that also knows how to manage
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the machine lifecycle with the help of a start script / command."""
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name: str
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out_dir: Path
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tmp_dir: Path
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shared_dir: Path
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state_dir: Path
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monitor_path: Path
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qmp_path: Path
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shell_path: Path
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start_command: StartCommand
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keep_vm_state: bool
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process: Optional[subprocess.Popen]
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pid: Optional[int]
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monitor: Optional[socket.socket]
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qmp_client: Optional[QMPSession]
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shell: Optional[socket.socket]
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serial_thread: Optional[threading.Thread]
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booted: bool
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connected: bool
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# Store last serial console lines for use
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# of wait_for_console_text
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last_lines: Queue = Queue()
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callbacks: List[Callable]
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def __repr__(self) -> str:
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return f"<Machine '{self.name}'>"
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def __init__(
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self,
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out_dir: Path,
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tmp_dir: Path,
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start_command: StartCommand,
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name: str = "machine",
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keep_vm_state: bool = False,
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callbacks: Optional[List[Callable]] = None,
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) -> None:
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self.out_dir = out_dir
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self.tmp_dir = tmp_dir
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self.keep_vm_state = keep_vm_state
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self.name = name
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self.start_command = start_command
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self.callbacks = callbacks if callbacks is not None else []
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# set up directories
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self.shared_dir = self.tmp_dir / "shared-xchg"
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self.shared_dir.mkdir(mode=0o700, exist_ok=True)
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self.state_dir = self.tmp_dir / f"vm-state-{self.name}"
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self.monitor_path = self.state_dir / "monitor"
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self.qmp_path = self.state_dir / "qmp"
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self.shell_path = self.state_dir / "shell"
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if (not self.keep_vm_state) and self.state_dir.exists():
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self.cleanup_statedir()
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self.state_dir.mkdir(mode=0o700, exist_ok=True)
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self.process = None
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self.pid = None
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self.monitor = None
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self.qmp_client = None
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self.shell = None
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self.serial_thread = None
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self.booted = False
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self.connected = False
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def is_up(self) -> bool:
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return self.booted and self.connected
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def log(self, msg: str) -> None:
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rootlog.log(msg, {"machine": self.name})
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def log_serial(self, msg: str) -> None:
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rootlog.log_serial(msg, self.name)
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def nested(self, msg: str, attrs: Dict[str, str] = {}) -> _GeneratorContextManager:
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my_attrs = {"machine": self.name}
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my_attrs.update(attrs)
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return rootlog.nested(msg, my_attrs)
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def wait_for_monitor_prompt(self) -> str:
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assert self.monitor is not None
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answer = ""
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while True:
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undecoded_answer = self.monitor.recv(1024)
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if not undecoded_answer:
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break
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answer += undecoded_answer.decode()
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if answer.endswith("(qemu) "):
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break
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return answer
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def send_monitor_command(self, command: str) -> str:
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"""
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Send a command to the QEMU monitor. This allows attaching
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virtual USB disks to a running machine, among other things.
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"""
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self.run_callbacks()
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message = f"{command}\n".encode()
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assert self.monitor is not None
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self.monitor.send(message)
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return self.wait_for_monitor_prompt()
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def wait_for_unit(
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self, unit: str, user: Optional[str] = None, timeout: int = 900
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) -> None:
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"""
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Wait for a systemd unit to get into "active" state.
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Throws exceptions on "failed" and "inactive" states as well as after
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timing out.
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"""
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def check_active(_: Any) -> bool:
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state = self.get_unit_property(unit, "ActiveState", user)
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if state == "failed":
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raise Exception(f'unit "{unit}" reached state "{state}"')
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if state == "inactive":
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status, jobs = self.systemctl("list-jobs --full 2>&1", user)
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if "No jobs" in jobs:
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info = self.get_unit_info(unit, user)
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if info["ActiveState"] == state:
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raise Exception(
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f'unit "{unit}" is inactive and there are no pending jobs'
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)
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return state == "active"
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with self.nested(
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f"waiting for unit {unit}"
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+ (f" with user {user}" if user is not None else "")
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):
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retry(check_active, timeout)
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def get_unit_info(self, unit: str, user: Optional[str] = None) -> Dict[str, str]:
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status, lines = self.systemctl(f'--no-pager show "{unit}"', user)
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if status != 0:
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raise Exception(
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f'retrieving systemctl info for unit "{unit}"'
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+ ("" if user is None else f' under user "{user}"')
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+ f" failed with exit code {status}"
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)
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line_pattern = re.compile(r"^([^=]+)=(.*)$")
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def tuple_from_line(line: str) -> Tuple[str, str]:
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match = line_pattern.match(line)
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assert match is not None
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return match[1], match[2]
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return dict(
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tuple_from_line(line)
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for line in lines.split("\n")
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if line_pattern.match(line)
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)
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def get_unit_property(
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self,
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unit: str,
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property: str,
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user: Optional[str] = None,
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) -> str:
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status, lines = self.systemctl(
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f'--no-pager show "{unit}" --property="{property}"',
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user,
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)
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if status != 0:
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raise Exception(
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f'retrieving systemctl property "{property}" for unit "{unit}"'
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+ ("" if user is None else f' under user "{user}"')
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+ f" failed with exit code {status}"
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)
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invalid_output_message = (
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f'systemctl show --property "{property}" "{unit}"'
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f"produced invalid output: {lines}"
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)
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line_pattern = re.compile(r"^([^=]+)=(.*)$")
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match = line_pattern.match(lines)
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assert match is not None, invalid_output_message
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assert match[1] == property, invalid_output_message
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return match[2]
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def systemctl(self, q: str, user: Optional[str] = None) -> Tuple[int, str]:
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"""
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Runs `systemctl` commands with optional support for
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`systemctl --user`
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```py
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# run `systemctl list-jobs --no-pager`
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machine.systemctl("list-jobs --no-pager")
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# spawn a shell for `any-user` and run
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# `systemctl --user list-jobs --no-pager`
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machine.systemctl("list-jobs --no-pager", "any-user")
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```
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"""
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if user is not None:
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q = q.replace("'", "\\'")
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return self.execute(
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f"su -l {user} --shell /bin/sh -c "
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"$'XDG_RUNTIME_DIR=/run/user/`id -u` "
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f"systemctl --user {q}'"
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)
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return self.execute(f"systemctl {q}")
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|
|
def require_unit_state(self, unit: str, require_state: str = "active") -> None:
|
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with self.nested(
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f"checking if unit '{unit}' has reached state '{require_state}'"
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):
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info = self.get_unit_info(unit)
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state = info["ActiveState"]
|
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if state != require_state:
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raise Exception(
|
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f"Expected unit '{unit}' to to be in state "
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f"'{require_state}' but it is in state '{state}'"
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)
|
|
|
|
def _next_newline_closed_block_from_shell(self) -> str:
|
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assert self.shell
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output_buffer = []
|
|
while True:
|
|
# This receives up to 4096 bytes from the socket
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chunk = self.shell.recv(4096)
|
|
if not chunk:
|
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# Probably a broken pipe, return the output we have
|
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break
|
|
|
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decoded = chunk.decode()
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output_buffer += [decoded]
|
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if decoded[-1] == "\n":
|
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break
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return "".join(output_buffer)
|
|
|
|
def execute(
|
|
self,
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command: str,
|
|
check_return: bool = True,
|
|
check_output: bool = True,
|
|
timeout: Optional[int] = 900,
|
|
) -> Tuple[int, str]:
|
|
"""
|
|
Execute a shell command, returning a list `(status, stdout)`.
|
|
|
|
Commands are run with `set -euo pipefail` set:
|
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|
|
- If several commands are separated by `;` and one fails, the
|
|
command as a whole will fail.
|
|
|
|
- For pipelines, the last non-zero exit status will be returned
|
|
(if there is one; otherwise zero will be returned).
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|
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- Dereferencing unset variables fails the command.
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- It will wait for stdout to be closed.
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|
|
If the command detaches, it must close stdout, as `execute` will wait
|
|
for this to consume all output reliably. This can be achieved by
|
|
redirecting stdout to stderr `>&2`, to `/dev/console`, `/dev/null` or
|
|
a file. Examples of detaching commands are `sleep 365d &`, where the
|
|
shell forks a new process that can write to stdout and `xclip -i`, where
|
|
the `xclip` command itself forks without closing stdout.
|
|
|
|
Takes an optional parameter `check_return` that defaults to `True`.
|
|
Setting this parameter to `False` will not check for the return code
|
|
and return -1 instead. This can be used for commands that shut down
|
|
the VM and would therefore break the pipe that would be used for
|
|
retrieving the return code.
|
|
|
|
A timeout for the command can be specified (in seconds) using the optional
|
|
`timeout` parameter, e.g., `execute(cmd, timeout=10)` or
|
|
`execute(cmd, timeout=None)`. The default is 900 seconds.
|
|
"""
|
|
self.run_callbacks()
|
|
self.connect()
|
|
|
|
# Always run command with shell opts
|
|
command = f"set -euo pipefail; {command}"
|
|
|
|
timeout_str = ""
|
|
if timeout is not None:
|
|
timeout_str = f"timeout {timeout}"
|
|
|
|
# While sh is bash on NixOS, this is not the case for every distro.
|
|
# We explicitly call bash here to allow for the driver to boot other distros as well.
|
|
out_command = (
|
|
f"{timeout_str} bash -c {shlex.quote(command)} | (base64 -w 0; echo)\n"
|
|
)
|
|
|
|
assert self.shell
|
|
self.shell.send(out_command.encode())
|
|
|
|
if not check_output:
|
|
return (-2, "")
|
|
|
|
# Get the output
|
|
output = base64.b64decode(self._next_newline_closed_block_from_shell())
|
|
|
|
if not check_return:
|
|
return (-1, output.decode())
|
|
|
|
# Get the return code
|
|
self.shell.send(b"echo ${PIPESTATUS[0]}\n")
|
|
rc = int(self._next_newline_closed_block_from_shell().strip())
|
|
|
|
return (rc, output.decode(errors="replace"))
|
|
|
|
def shell_interact(self, address: Optional[str] = None) -> None:
|
|
"""
|
|
Allows you to directly interact with the guest shell. This should
|
|
only be used during test development, not in production tests.
|
|
Killing the interactive session with `Ctrl-d` or `Ctrl-c` also ends
|
|
the guest session.
|
|
"""
|
|
self.connect()
|
|
|
|
if address is None:
|
|
address = "READLINE,prompt=$ "
|
|
self.log("Terminal is ready (there is no initial prompt):")
|
|
|
|
assert self.shell
|
|
try:
|
|
subprocess.run(
|
|
["socat", address, f"FD:{self.shell.fileno()}"],
|
|
pass_fds=[self.shell.fileno()],
|
|
)
|
|
# allow users to cancel this command without breaking the test
|
|
except KeyboardInterrupt:
|
|
pass
|
|
|
|
def console_interact(self) -> None:
|
|
"""
|
|
Allows you to directly interact with QEMU's stdin, by forwarding
|
|
terminal input to the QEMU process.
|
|
This is for use with the interactive test driver, not for production
|
|
tests, which run unattended.
|
|
Output from QEMU is only read line-wise. `Ctrl-c` kills QEMU and
|
|
`Ctrl-d` closes console and returns to the test runner.
|
|
"""
|
|
self.log("Terminal is ready (there is no prompt):")
|
|
|
|
assert self.process
|
|
assert self.process.stdin
|
|
|
|
while True:
|
|
try:
|
|
char = sys.stdin.buffer.read(1)
|
|
except KeyboardInterrupt:
|
|
break
|
|
if char == b"": # ctrl+d
|
|
self.log("Closing connection to the console")
|
|
break
|
|
self.send_console(char.decode())
|
|
|
|
def succeed(self, *commands: str, timeout: Optional[int] = None) -> str:
|
|
"""
|
|
Execute a shell command, raising an exception if the exit status is
|
|
not zero, otherwise returning the standard output. Similar to `execute`,
|
|
except that the timeout is `None` by default. See `execute` for details on
|
|
command execution.
|
|
"""
|
|
output = ""
|
|
for command in commands:
|
|
with self.nested(f"must succeed: {command}"):
|
|
(status, out) = self.execute(command, timeout=timeout)
|
|
if status != 0:
|
|
self.log(f"output: {out}")
|
|
raise Exception(f"command `{command}` failed (exit code {status})")
|
|
output += out
|
|
return output
|
|
|
|
def fail(self, *commands: str, timeout: Optional[int] = None) -> str:
|
|
"""
|
|
Like `succeed`, but raising an exception if the command returns a zero
|
|
status.
|
|
"""
|
|
output = ""
|
|
for command in commands:
|
|
with self.nested(f"must fail: {command}"):
|
|
(status, out) = self.execute(command, timeout=timeout)
|
|
if status == 0:
|
|
raise Exception(f"command `{command}` unexpectedly succeeded")
|
|
output += out
|
|
return output
|
|
|
|
def wait_until_succeeds(self, command: str, timeout: int = 900) -> str:
|
|
"""
|
|
Repeat a shell command with 1-second intervals until it succeeds.
|
|
Has a default timeout of 900 seconds which can be modified, e.g.
|
|
`wait_until_succeeds(cmd, timeout=10)`. See `execute` for details on
|
|
command execution.
|
|
Throws an exception on timeout.
|
|
"""
|
|
output = ""
|
|
|
|
def check_success(_: Any) -> bool:
|
|
nonlocal output
|
|
status, output = self.execute(command, timeout=timeout)
|
|
return status == 0
|
|
|
|
with self.nested(f"waiting for success: {command}"):
|
|
retry(check_success, timeout)
|
|
return output
|
|
|
|
def wait_until_fails(self, command: str, timeout: int = 900) -> str:
|
|
"""
|
|
Like `wait_until_succeeds`, but repeating the command until it fails.
|
|
"""
|
|
output = ""
|
|
|
|
def check_failure(_: Any) -> bool:
|
|
nonlocal output
|
|
status, output = self.execute(command, timeout=timeout)
|
|
return status != 0
|
|
|
|
with self.nested(f"waiting for failure: {command}"):
|
|
retry(check_failure, timeout)
|
|
return output
|
|
|
|
def wait_for_shutdown(self) -> None:
|
|
if not self.booted:
|
|
return
|
|
|
|
with self.nested("waiting for the VM to power off"):
|
|
sys.stdout.flush()
|
|
assert self.process
|
|
self.process.wait()
|
|
|
|
self.pid = None
|
|
self.booted = False
|
|
self.connected = False
|
|
|
|
def wait_for_qmp_event(
|
|
self, event_filter: Callable[[dict[str, Any]], bool], timeout: int = 60 * 10
|
|
) -> dict[str, Any]:
|
|
"""
|
|
Wait for a QMP event which you can filter with the `event_filter` function.
|
|
The function takes as an input a dictionary of the event and if it returns True, we return that event,
|
|
if it does not, we wait for the next event and retry.
|
|
|
|
It will skip all events received in the meantime, if you want to keep them,
|
|
you have to do the bookkeeping yourself and store them somewhere.
|
|
|
|
By default, it will wait up to 10 minutes, `timeout` is in seconds.
|
|
"""
|
|
if self.qmp_client is None:
|
|
raise RuntimeError("QMP API is not ready yet, is the VM ready?")
|
|
|
|
start = time.time()
|
|
while True:
|
|
evt = self.qmp_client.wait_for_event(timeout=timeout)
|
|
if event_filter(evt):
|
|
return evt
|
|
|
|
elapsed = time.time() - start
|
|
if elapsed >= timeout:
|
|
raise TimeoutError
|
|
|
|
def get_tty_text(self, tty: str) -> str:
|
|
status, output = self.execute(
|
|
f"fold -w$(stty -F /dev/tty{tty} size | "
|
|
f"awk '{{print $2}}') /dev/vcs{tty}"
|
|
)
|
|
return output
|
|
|
|
def wait_until_tty_matches(self, tty: str, regexp: str, timeout: int = 900) -> None:
|
|
"""Wait until the visible output on the chosen TTY matches regular
|
|
expression. Throws an exception on timeout.
|
|
"""
|
|
matcher = re.compile(regexp)
|
|
|
|
def tty_matches(last: bool) -> bool:
|
|
text = self.get_tty_text(tty)
|
|
if last:
|
|
self.log(
|
|
f"Last chance to match /{regexp}/ on TTY{tty}, "
|
|
f"which currently contains: {text}"
|
|
)
|
|
return len(matcher.findall(text)) > 0
|
|
|
|
with self.nested(f"waiting for {regexp} to appear on tty {tty}"):
|
|
retry(tty_matches, timeout)
|
|
|
|
def send_chars(self, chars: str, delay: Optional[float] = 0.01) -> None:
|
|
"""
|
|
Simulate typing a sequence of characters on the virtual keyboard,
|
|
e.g., `send_chars("foobar\n")` will type the string `foobar`
|
|
followed by the Enter key.
|
|
"""
|
|
with self.nested(f"sending keys {repr(chars)}"):
|
|
for char in chars:
|
|
self.send_key(char, delay, log=False)
|
|
|
|
def wait_for_file(self, filename: str, timeout: int = 900) -> None:
|
|
"""
|
|
Waits until the file exists in the machine's file system.
|
|
"""
|
|
|
|
def check_file(_: Any) -> bool:
|
|
status, _ = self.execute(f"test -e {filename}")
|
|
return status == 0
|
|
|
|
with self.nested(f"waiting for file '{filename}'"):
|
|
retry(check_file, timeout)
|
|
|
|
def wait_for_open_port(
|
|
self, port: int, addr: str = "localhost", timeout: int = 900
|
|
) -> None:
|
|
"""
|
|
Wait until a process is listening on the given TCP port and IP address
|
|
(default `localhost`).
|
|
"""
|
|
|
|
def port_is_open(_: Any) -> bool:
|
|
status, _ = self.execute(f"nc -z {addr} {port}")
|
|
return status == 0
|
|
|
|
with self.nested(f"waiting for TCP port {port} on {addr}"):
|
|
retry(port_is_open, timeout)
|
|
|
|
def wait_for_open_unix_socket(
|
|
self, addr: str, is_datagram: bool = False, timeout: int = 900
|
|
) -> None:
|
|
"""
|
|
Wait until a process is listening on the given UNIX-domain socket
|
|
(default to a UNIX-domain stream socket).
|
|
"""
|
|
|
|
nc_flags = [
|
|
"-z",
|
|
"-uU" if is_datagram else "-U",
|
|
]
|
|
|
|
def socket_is_open(_: Any) -> bool:
|
|
status, _ = self.execute(f"nc {' '.join(nc_flags)} {addr}")
|
|
return status == 0
|
|
|
|
with self.nested(
|
|
f"waiting for UNIX-domain {'datagram' if is_datagram else 'stream'} on '{addr}'"
|
|
):
|
|
retry(socket_is_open, timeout)
|
|
|
|
def wait_for_closed_port(
|
|
self, port: int, addr: str = "localhost", timeout: int = 900
|
|
) -> None:
|
|
"""
|
|
Wait until nobody is listening on the given TCP port and IP address
|
|
(default `localhost`).
|
|
"""
|
|
|
|
def port_is_closed(_: Any) -> bool:
|
|
status, _ = self.execute(f"nc -z {addr} {port}")
|
|
return status != 0
|
|
|
|
with self.nested(f"waiting for TCP port {port} on {addr} to be closed"):
|
|
retry(port_is_closed, timeout)
|
|
|
|
def start_job(self, jobname: str, user: Optional[str] = None) -> Tuple[int, str]:
|
|
return self.systemctl(f"start {jobname}", user)
|
|
|
|
def stop_job(self, jobname: str, user: Optional[str] = None) -> Tuple[int, str]:
|
|
return self.systemctl(f"stop {jobname}", user)
|
|
|
|
def wait_for_job(self, jobname: str) -> None:
|
|
self.wait_for_unit(jobname)
|
|
|
|
def connect(self) -> None:
|
|
def shell_ready(timeout_secs: int) -> bool:
|
|
"""We sent some data from the backdoor service running on the guest
|
|
to indicate that the backdoor shell is ready.
|
|
As soon as we read some data from the socket here, we assume that
|
|
our root shell is operational.
|
|
"""
|
|
(ready, _, _) = select.select([self.shell], [], [], timeout_secs)
|
|
return bool(ready)
|
|
|
|
if self.connected:
|
|
return
|
|
|
|
with self.nested("waiting for the VM to finish booting"):
|
|
self.start()
|
|
|
|
assert self.shell
|
|
|
|
tic = time.time()
|
|
# TODO: do we want to bail after a set number of attempts?
|
|
while not shell_ready(timeout_secs=30):
|
|
self.log("Guest root shell did not produce any data yet...")
|
|
self.log(
|
|
" To debug, enter the VM and run 'systemctl status backdoor.service'."
|
|
)
|
|
|
|
while True:
|
|
chunk = self.shell.recv(1024)
|
|
# No need to print empty strings, it means we are waiting.
|
|
if len(chunk) == 0:
|
|
continue
|
|
self.log(f"Guest shell says: {chunk!r}")
|
|
# NOTE: for this to work, nothing must be printed after this line!
|
|
if b"Spawning backdoor root shell..." in chunk:
|
|
break
|
|
|
|
toc = time.time()
|
|
|
|
self.log("connected to guest root shell")
|
|
self.log(f"(connecting took {toc - tic:.2f} seconds)")
|
|
self.connected = True
|
|
|
|
def screenshot(self, filename: str) -> None:
|
|
"""
|
|
Take a picture of the display of the virtual machine, in PNG format.
|
|
The screenshot will be available in the derivation output.
|
|
"""
|
|
if "." not in filename:
|
|
filename += ".png"
|
|
if "/" not in filename:
|
|
filename = os.path.join(self.out_dir, filename)
|
|
tmp = f"{filename}.ppm"
|
|
|
|
with self.nested(
|
|
f"making screenshot {filename}",
|
|
{"image": os.path.basename(filename)},
|
|
):
|
|
self.send_monitor_command(f"screendump {tmp}")
|
|
ret = subprocess.run(f"pnmtopng '{tmp}' > '{filename}'", shell=True)
|
|
os.unlink(tmp)
|
|
if ret.returncode != 0:
|
|
raise Exception("Cannot convert screenshot")
|
|
|
|
def copy_from_host_via_shell(self, source: str, target: str) -> None:
|
|
"""Copy a file from the host into the guest by piping it over the
|
|
shell into the destination file. Works without host-guest shared folder.
|
|
Prefer copy_from_host for whenever possible.
|
|
"""
|
|
with open(source, "rb") as fh:
|
|
content_b64 = base64.b64encode(fh.read()).decode()
|
|
self.succeed(
|
|
f"mkdir -p $(dirname {target})",
|
|
f"echo -n {content_b64} | base64 -d > {target}",
|
|
)
|
|
|
|
def copy_from_host(self, source: str, target: str) -> None:
|
|
"""
|
|
Copies a file from host to machine, e.g.,
|
|
`copy_from_host("myfile", "/etc/my/important/file")`.
|
|
|
|
The first argument is the file on the host. Note that the "host" refers
|
|
to the environment in which the test driver runs, which is typically the
|
|
Nix build sandbox.
|
|
|
|
The second argument is the location of the file on the machine that will
|
|
be written to.
|
|
|
|
The file is copied via the `shared_dir` directory which is shared among
|
|
all the VMs (using a temporary directory).
|
|
The access rights bits will mimic the ones from the host file and
|
|
user:group will be root:root.
|
|
"""
|
|
host_src = Path(source)
|
|
vm_target = Path(target)
|
|
with tempfile.TemporaryDirectory(dir=self.shared_dir) as shared_td:
|
|
shared_temp = Path(shared_td)
|
|
host_intermediate = shared_temp / host_src.name
|
|
vm_shared_temp = Path("/tmp/shared") / shared_temp.name
|
|
vm_intermediate = vm_shared_temp / host_src.name
|
|
|
|
self.succeed(make_command(["mkdir", "-p", vm_shared_temp]))
|
|
if host_src.is_dir():
|
|
shutil.copytree(host_src, host_intermediate)
|
|
else:
|
|
shutil.copy(host_src, host_intermediate)
|
|
self.succeed(make_command(["mkdir", "-p", vm_target.parent]))
|
|
self.succeed(make_command(["cp", "-r", vm_intermediate, vm_target]))
|
|
|
|
def copy_from_vm(self, source: str, target_dir: str = "") -> None:
|
|
"""Copy a file from the VM (specified by an in-VM source path) to a path
|
|
relative to `$out`. The file is copied via the `shared_dir` shared among
|
|
all the VMs (using a temporary directory).
|
|
"""
|
|
# Compute the source, target, and intermediate shared file names
|
|
vm_src = Path(source)
|
|
with tempfile.TemporaryDirectory(dir=self.shared_dir) as shared_td:
|
|
shared_temp = Path(shared_td)
|
|
vm_shared_temp = Path("/tmp/shared") / shared_temp.name
|
|
vm_intermediate = vm_shared_temp / vm_src.name
|
|
intermediate = shared_temp / vm_src.name
|
|
# Copy the file to the shared directory inside VM
|
|
self.succeed(make_command(["mkdir", "-p", vm_shared_temp]))
|
|
self.succeed(make_command(["cp", "-r", vm_src, vm_intermediate]))
|
|
abs_target = self.out_dir / target_dir / vm_src.name
|
|
abs_target.parent.mkdir(exist_ok=True, parents=True)
|
|
# Copy the file from the shared directory outside VM
|
|
if intermediate.is_dir():
|
|
shutil.copytree(intermediate, abs_target)
|
|
else:
|
|
shutil.copy(intermediate, abs_target)
|
|
|
|
def dump_tty_contents(self, tty: str) -> None:
|
|
"""Debugging: Dump the contents of the TTY<n>"""
|
|
self.execute(f"fold -w 80 /dev/vcs{tty} | systemd-cat")
|
|
|
|
def _get_screen_text_variants(self, model_ids: Iterable[int]) -> List[str]:
|
|
with tempfile.TemporaryDirectory() as tmpdir:
|
|
screenshot_path = os.path.join(tmpdir, "ppm")
|
|
self.send_monitor_command(f"screendump {screenshot_path}")
|
|
return _perform_ocr_on_screenshot(screenshot_path, model_ids)
|
|
|
|
def get_screen_text_variants(self) -> List[str]:
|
|
"""
|
|
Return a list of different interpretations of what is currently
|
|
visible on the machine's screen using optical character
|
|
recognition. The number and order of the interpretations is not
|
|
specified and is subject to change, but if no exception is raised at
|
|
least one will be returned.
|
|
|
|
::: {.note}
|
|
This requires [`enableOCR`](#test-opt-enableOCR) to be set to `true`.
|
|
:::
|
|
"""
|
|
return self._get_screen_text_variants([0, 1, 2])
|
|
|
|
def get_screen_text(self) -> str:
|
|
"""
|
|
Return a textual representation of what is currently visible on the
|
|
machine's screen using optical character recognition.
|
|
|
|
::: {.note}
|
|
This requires [`enableOCR`](#test-opt-enableOCR) to be set to `true`.
|
|
:::
|
|
"""
|
|
return self._get_screen_text_variants([2])[0]
|
|
|
|
def wait_for_text(self, regex: str, timeout: int = 900) -> None:
|
|
"""
|
|
Wait until the supplied regular expressions matches the textual
|
|
contents of the screen by using optical character recognition (see
|
|
`get_screen_text` and `get_screen_text_variants`).
|
|
|
|
::: {.note}
|
|
This requires [`enableOCR`](#test-opt-enableOCR) to be set to `true`.
|
|
:::
|
|
"""
|
|
|
|
def screen_matches(last: bool) -> bool:
|
|
variants = self.get_screen_text_variants()
|
|
for text in variants:
|
|
if re.search(regex, text) is not None:
|
|
return True
|
|
|
|
if last:
|
|
self.log(f"Last OCR attempt failed. Text was: {variants}")
|
|
|
|
return False
|
|
|
|
with self.nested(f"waiting for {regex} to appear on screen"):
|
|
retry(screen_matches, timeout)
|
|
|
|
def wait_for_console_text(self, regex: str, timeout: int | None = None) -> None:
|
|
"""
|
|
Wait until the supplied regular expressions match a line of the
|
|
serial console output.
|
|
This method is useful when OCR is not possible or inaccurate.
|
|
"""
|
|
# Buffer the console output, this is needed
|
|
# to match multiline regexes.
|
|
console = io.StringIO()
|
|
|
|
def console_matches(_: Any) -> bool:
|
|
nonlocal console
|
|
try:
|
|
# This will return as soon as possible and
|
|
# sleep 1 second.
|
|
console.write(self.last_lines.get(block=False))
|
|
except queue.Empty:
|
|
pass
|
|
console.seek(0)
|
|
matches = re.search(regex, console.read())
|
|
return matches is not None
|
|
|
|
with self.nested(f"waiting for {regex} to appear on console"):
|
|
if timeout is not None:
|
|
retry(console_matches, timeout)
|
|
else:
|
|
while not console_matches(False):
|
|
pass
|
|
|
|
def send_key(
|
|
self, key: str, delay: Optional[float] = 0.01, log: Optional[bool] = True
|
|
) -> None:
|
|
"""
|
|
Simulate pressing keys on the virtual keyboard, e.g.,
|
|
`send_key("ctrl-alt-delete")`.
|
|
|
|
Please also refer to the QEMU documentation for more information on the
|
|
input syntax: https://en.wikibooks.org/wiki/QEMU/Monitor#sendkey_keys
|
|
"""
|
|
key = CHAR_TO_KEY.get(key, key)
|
|
context = self.nested(f"sending key {repr(key)}") if log else nullcontext()
|
|
with context:
|
|
self.send_monitor_command(f"sendkey {key}")
|
|
if delay is not None:
|
|
time.sleep(delay)
|
|
|
|
def send_console(self, chars: str) -> None:
|
|
r"""
|
|
Send keys to the kernel console. This allows interaction with the systemd
|
|
emergency mode, for example. Takes a string that is sent, e.g.,
|
|
`send_console("\n\nsystemctl default\n")`.
|
|
"""
|
|
assert self.process
|
|
assert self.process.stdin
|
|
self.process.stdin.write(chars.encode())
|
|
self.process.stdin.flush()
|
|
|
|
def start(self, allow_reboot: bool = False) -> None:
|
|
"""
|
|
Start the virtual machine. This method is asynchronous --- it does
|
|
not wait for the machine to finish booting.
|
|
"""
|
|
if self.booted:
|
|
return
|
|
|
|
self.log("starting vm")
|
|
|
|
def clear(path: Path) -> Path:
|
|
if path.exists():
|
|
path.unlink()
|
|
return path
|
|
|
|
def create_socket(path: Path) -> socket.socket:
|
|
s = socket.socket(family=socket.AF_UNIX, type=socket.SOCK_STREAM)
|
|
s.bind(str(path))
|
|
s.listen(1)
|
|
return s
|
|
|
|
monitor_socket = create_socket(clear(self.monitor_path))
|
|
shell_socket = create_socket(clear(self.shell_path))
|
|
self.process = self.start_command.run(
|
|
self.state_dir,
|
|
self.shared_dir,
|
|
self.monitor_path,
|
|
self.qmp_path,
|
|
self.shell_path,
|
|
allow_reboot,
|
|
)
|
|
self.monitor, _ = monitor_socket.accept()
|
|
self.shell, _ = shell_socket.accept()
|
|
self.qmp_client = QMPSession.from_path(self.qmp_path)
|
|
|
|
# Store last serial console lines for use
|
|
# of wait_for_console_text
|
|
self.last_lines: Queue = Queue()
|
|
|
|
def process_serial_output() -> None:
|
|
assert self.process
|
|
assert self.process.stdout
|
|
for _line in self.process.stdout:
|
|
# Ignore undecodable bytes that may occur in boot menus
|
|
line = _line.decode(errors="ignore").replace("\r", "").rstrip()
|
|
self.last_lines.put(line)
|
|
self.log_serial(line)
|
|
|
|
self.serial_thread = threading.Thread(target=process_serial_output)
|
|
self.serial_thread.start()
|
|
|
|
self.wait_for_monitor_prompt()
|
|
|
|
self.pid = self.process.pid
|
|
self.booted = True
|
|
|
|
self.log(f"QEMU running (pid {self.pid})")
|
|
|
|
def cleanup_statedir(self) -> None:
|
|
shutil.rmtree(self.state_dir)
|
|
rootlog.log(f"deleting VM state directory {self.state_dir}")
|
|
rootlog.log("if you want to keep the VM state, pass --keep-vm-state")
|
|
|
|
def shutdown(self) -> None:
|
|
"""
|
|
Shut down the machine, waiting for the VM to exit.
|
|
"""
|
|
if not self.booted:
|
|
return
|
|
|
|
assert self.shell
|
|
self.shell.send(b"poweroff\n")
|
|
self.wait_for_shutdown()
|
|
|
|
def crash(self) -> None:
|
|
"""
|
|
Simulate a sudden power failure, by telling the VM to exit immediately.
|
|
"""
|
|
if not self.booted:
|
|
return
|
|
|
|
self.log("forced crash")
|
|
self.send_monitor_command("quit")
|
|
self.wait_for_shutdown()
|
|
|
|
def reboot(self) -> None:
|
|
"""Press Ctrl+Alt+Delete in the guest.
|
|
|
|
Prepares the machine to be reconnected which is useful if the
|
|
machine was started with `allow_reboot = True`
|
|
"""
|
|
self.send_key("ctrl-alt-delete")
|
|
self.connected = False
|
|
|
|
def wait_for_x(self, timeout: int = 900) -> None:
|
|
"""
|
|
Wait until it is possible to connect to the X server.
|
|
"""
|
|
|
|
def check_x(_: Any) -> bool:
|
|
cmd = (
|
|
"journalctl -b SYSLOG_IDENTIFIER=systemd | "
|
|
+ 'grep "Reached target Current graphical"'
|
|
)
|
|
status, _ = self.execute(cmd)
|
|
if status != 0:
|
|
return False
|
|
status, _ = self.execute("[ -e /tmp/.X11-unix/X0 ]")
|
|
return status == 0
|
|
|
|
with self.nested("waiting for the X11 server"):
|
|
retry(check_x, timeout)
|
|
|
|
def get_window_names(self) -> List[str]:
|
|
return self.succeed(
|
|
r"xwininfo -root -tree | sed 's/.*0x[0-9a-f]* \"\([^\"]*\)\".*/\1/; t; d'"
|
|
).splitlines()
|
|
|
|
def wait_for_window(self, regexp: str, timeout: int = 900) -> None:
|
|
"""
|
|
Wait until an X11 window has appeared whose name matches the given
|
|
regular expression, e.g., `wait_for_window("Terminal")`.
|
|
"""
|
|
pattern = re.compile(regexp)
|
|
|
|
def window_is_visible(last_try: bool) -> bool:
|
|
names = self.get_window_names()
|
|
if last_try:
|
|
self.log(
|
|
f"Last chance to match {regexp} on the window list,"
|
|
+ " which currently contains: "
|
|
+ ", ".join(names)
|
|
)
|
|
return any(pattern.search(name) for name in names)
|
|
|
|
with self.nested("waiting for a window to appear"):
|
|
retry(window_is_visible, timeout)
|
|
|
|
def sleep(self, secs: int) -> None:
|
|
# We want to sleep in *guest* time, not *host* time.
|
|
self.succeed(f"sleep {secs}")
|
|
|
|
def forward_port(self, host_port: int = 8080, guest_port: int = 80) -> None:
|
|
"""
|
|
Forward a TCP port on the host to a TCP port on the guest.
|
|
Useful during interactive testing.
|
|
"""
|
|
self.send_monitor_command(f"hostfwd_add tcp::{host_port}-:{guest_port}")
|
|
|
|
def block(self) -> None:
|
|
"""
|
|
Simulate unplugging the Ethernet cable that connects the machine to
|
|
the other machines.
|
|
This happens by shutting down eth1 (the multicast interface used to talk
|
|
to the other VMs). eth0 is kept online to still enable the test driver
|
|
to communicate with the machine.
|
|
"""
|
|
self.send_monitor_command("set_link virtio-net-pci.1 off")
|
|
|
|
def unblock(self) -> None:
|
|
"""
|
|
Undo the effect of `block`.
|
|
"""
|
|
self.send_monitor_command("set_link virtio-net-pci.1 on")
|
|
|
|
def release(self) -> None:
|
|
if self.pid is None:
|
|
return
|
|
rootlog.info(f"kill machine (pid {self.pid})")
|
|
assert self.process
|
|
assert self.shell
|
|
assert self.monitor
|
|
assert self.serial_thread
|
|
|
|
self.process.terminate()
|
|
self.shell.close()
|
|
self.monitor.close()
|
|
self.serial_thread.join()
|
|
|
|
def run_callbacks(self) -> None:
|
|
for callback in self.callbacks:
|
|
callback()
|
|
|
|
def switch_root(self) -> None:
|
|
"""
|
|
Transition from stage 1 to stage 2. This requires the
|
|
machine to be configured with `testing.initrdBackdoor = true`
|
|
and `boot.initrd.systemd.enable = true`.
|
|
"""
|
|
self.wait_for_unit("initrd.target")
|
|
self.execute(
|
|
"systemctl isolate --no-block initrd-switch-root.target 2>/dev/null >/dev/null",
|
|
check_return=False,
|
|
check_output=False,
|
|
)
|
|
self.wait_for_console_text(r"systemd\[1\]:.*Switching root\.")
|
|
self.connected = False
|
|
self.connect()
|