from contextlib import _GeneratorContextManager, nullcontext from pathlib import Path from queue import Queue from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple import base64 import io import os import queue import re import shlex import shutil import socket import subprocess import sys import tempfile import threading import time from test_driver.logger import rootlog CHAR_TO_KEY = { "A": "shift-a", "N": "shift-n", "-": "0x0C", "_": "shift-0x0C", "B": "shift-b", "O": "shift-o", "=": "0x0D", "+": "shift-0x0D", "C": "shift-c", "P": "shift-p", "[": "0x1A", "{": "shift-0x1A", "D": "shift-d", "Q": "shift-q", "]": "0x1B", "}": "shift-0x1B", "E": "shift-e", "R": "shift-r", ";": "0x27", ":": "shift-0x27", "F": "shift-f", "S": "shift-s", "'": "0x28", '"': "shift-0x28", "G": "shift-g", "T": "shift-t", "`": "0x29", "~": "shift-0x29", "H": "shift-h", "U": "shift-u", "\\": "0x2B", "|": "shift-0x2B", "I": "shift-i", "V": "shift-v", ",": "0x33", "<": "shift-0x33", "J": "shift-j", "W": "shift-w", ".": "0x34", ">": "shift-0x34", "K": "shift-k", "X": "shift-x", "/": "0x35", "?": "shift-0x35", "L": "shift-l", "Y": "shift-y", " ": "spc", "M": "shift-m", "Z": "shift-z", "\n": "ret", "!": "shift-0x02", "@": "shift-0x03", "#": "shift-0x04", "$": "shift-0x05", "%": "shift-0x06", "^": "shift-0x07", "&": "shift-0x08", "*": "shift-0x09", "(": "shift-0x0A", ")": "shift-0x0B", } def make_command(args: list) -> str: return " ".join(map(shlex.quote, (map(str, args)))) def _perform_ocr_on_screenshot( screenshot_path: str, model_ids: Iterable[int] ) -> List[str]: if shutil.which("tesseract") is None: raise Exception("OCR requested but enableOCR is false") magick_args = ( "-filter Catrom -density 72 -resample 300 " + "-contrast -normalize -despeckle -type grayscale " + "-sharpen 1 -posterize 3 -negate -gamma 100 " + "-blur 1x65535" ) tess_args = f"-c debug_file=/dev/null --psm 11" cmd = f"convert {magick_args} '{screenshot_path}' 'tiff:{screenshot_path}.tiff'" ret = subprocess.run(cmd, shell=True, capture_output=True) if ret.returncode != 0: raise Exception(f"TIFF conversion failed with exit code {ret.returncode}") model_results = [] for model_id in model_ids: cmd = f"tesseract '{screenshot_path}.tiff' - {tess_args} --oem '{model_id}'" ret = subprocess.run(cmd, shell=True, capture_output=True) if ret.returncode != 0: raise Exception(f"OCR failed with exit code {ret.returncode}") model_results.append(ret.stdout.decode("utf-8")) return model_results def retry(fn: Callable, timeout: int = 900) -> None: """Call the given function repeatedly, with 1 second intervals, until it returns True or a timeout is reached. """ for _ in range(timeout): if fn(False): return time.sleep(1) if not fn(True): raise Exception(f"action timed out after {timeout} seconds") class StartCommand: """The Base Start Command knows how to append the necesary runtime qemu options as determined by a particular test driver run. Any such start command is expected to happily receive and append additional qemu args. """ _cmd: str def cmd( self, monitor_socket_path: Path, shell_socket_path: Path, allow_reboot: bool = False, # TODO: unused, legacy? ) -> str: display_opts = "" display_available = any(x in os.environ for x in ["DISPLAY", "WAYLAND_DISPLAY"]) if not display_available: display_opts += " -nographic" # qemu options qemu_opts = "" qemu_opts += ( "" if allow_reboot else " -no-reboot" " -device virtio-serial" " -device virtconsole,chardev=shell" " -device virtio-rng-pci" " -serial stdio" ) # TODO: qemu script already catpures this env variable, legacy? qemu_opts += " " + os.environ.get("QEMU_OPTS", "") return ( f"{self._cmd}" f" -monitor unix:{monitor_socket_path}" f" -chardev socket,id=shell,path={shell_socket_path}" f"{qemu_opts}" f"{display_opts}" ) @staticmethod def build_environment( state_dir: Path, shared_dir: Path, ) -> dict: # We make a copy to not update the current environment env = dict(os.environ) env.update( { "TMPDIR": str(state_dir), "SHARED_DIR": str(shared_dir), "USE_TMPDIR": "1", } ) return env def run( self, state_dir: Path, shared_dir: Path, monitor_socket_path: Path, shell_socket_path: Path, ) -> subprocess.Popen: return subprocess.Popen( self.cmd(monitor_socket_path, shell_socket_path), stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True, cwd=state_dir, env=self.build_environment(state_dir, shared_dir), ) class NixStartScript(StartCommand): """A start script from nixos/modules/virtualiation/qemu-vm.nix that also satisfies the requirement of the BaseStartCommand. These Nix commands have the particular charactersitic that the machine name can be extracted out of them via a regex match. (Admittedly a _very_ implicit contract, evtl. TODO fix) """ def __init__(self, script: str): self._cmd = script @property def machine_name(self) -> str: match = re.search("run-(.+)-vm$", self._cmd) name = "machine" if match: name = match.group(1) return name class LegacyStartCommand(StartCommand): """Used in some places to create an ad-hoc machine instead of using nix test instrumentation + module system for that purpose. Legacy. """ def __init__( self, netBackendArgs: Optional[str] = None, netFrontendArgs: Optional[str] = None, hda: Optional[Tuple[Path, str]] = None, cdrom: Optional[str] = None, usb: Optional[str] = None, bios: Optional[str] = None, qemuBinary: Optional[str] = None, qemuFlags: Optional[str] = None, ): if qemuBinary is not None: self._cmd = qemuBinary else: self._cmd = "qemu-kvm" self._cmd += " -m 384" # networking net_backend = "-netdev user,id=net0" net_frontend = "-device virtio-net-pci,netdev=net0" if netBackendArgs is not None: net_backend += "," + netBackendArgs if netFrontendArgs is not None: net_frontend += "," + netFrontendArgs self._cmd += f" {net_backend} {net_frontend}" # hda hda_cmd = "" if hda is not None: hda_path = hda[0].resolve() hda_interface = hda[1] if hda_interface == "scsi": hda_cmd += ( f" -drive id=hda,file={hda_path},werror=report,if=none" " -device scsi-hd,drive=hda" ) else: hda_cmd += f" -drive file={hda_path},if={hda_interface},werror=report" self._cmd += hda_cmd # cdrom if cdrom is not None: self._cmd += f" -cdrom {cdrom}" # usb usb_cmd = "" if usb is not None: # https://github.com/qemu/qemu/blob/master/docs/usb2.txt usb_cmd += ( " -device usb-ehci" f" -drive id=usbdisk,file={usb},if=none,readonly" " -device usb-storage,drive=usbdisk " ) self._cmd += usb_cmd # bios if bios is not None: self._cmd += f" -bios {bios}" # qemu flags if qemuFlags is not None: self._cmd += f" {qemuFlags}" class Machine: """A handle to the machine with this name, that also knows how to manage the machine lifecycle with the help of a start script / command.""" name: str out_dir: Path tmp_dir: Path shared_dir: Path state_dir: Path monitor_path: Path shell_path: Path start_command: StartCommand keep_vm_state: bool allow_reboot: bool process: Optional[subprocess.Popen] pid: Optional[int] monitor: Optional[socket.socket] shell: Optional[socket.socket] serial_thread: Optional[threading.Thread] booted: bool connected: bool # Store last serial console lines for use # of wait_for_console_text last_lines: Queue = Queue() callbacks: List[Callable] def __repr__(self) -> str: return f"" def __init__( self, out_dir: Path, tmp_dir: Path, start_command: StartCommand, name: str = "machine", keep_vm_state: bool = False, allow_reboot: bool = False, callbacks: Optional[List[Callable]] = None, ) -> None: self.out_dir = out_dir self.tmp_dir = tmp_dir self.keep_vm_state = keep_vm_state self.allow_reboot = allow_reboot self.name = name self.start_command = start_command self.callbacks = callbacks if callbacks is not None else [] # set up directories self.shared_dir = self.tmp_dir / "shared-xchg" self.shared_dir.mkdir(mode=0o700, exist_ok=True) self.state_dir = self.tmp_dir / f"vm-state-{self.name}" self.monitor_path = self.state_dir / "monitor" self.shell_path = self.state_dir / "shell" if (not self.keep_vm_state) and self.state_dir.exists(): self.cleanup_statedir() self.state_dir.mkdir(mode=0o700, exist_ok=True) self.process = None self.pid = None self.monitor = None self.shell = None self.serial_thread = None self.booted = False self.connected = False @staticmethod def create_startcommand(args: Dict[str, str]) -> StartCommand: rootlog.warning( "Using legacy create_startcommand()," "please use proper nix test vm instrumentation, instead" "to generate the appropriate nixos test vm qemu startup script" ) hda = None if args.get("hda"): hda_arg: str = args.get("hda", "") hda_arg_path: Path = Path(hda_arg) hda = (hda_arg_path, args.get("hdaInterface", "")) return LegacyStartCommand( netBackendArgs=args.get("netBackendArgs"), netFrontendArgs=args.get("netFrontendArgs"), hda=hda, cdrom=args.get("cdrom"), usb=args.get("usb"), bios=args.get("bios"), qemuBinary=args.get("qemuBinary"), qemuFlags=args.get("qemuFlags"), ) def is_up(self) -> bool: return self.booted and self.connected def log(self, msg: str) -> None: rootlog.log(msg, {"machine": self.name}) def log_serial(self, msg: str) -> None: rootlog.log_serial(msg, self.name) def nested(self, msg: str, attrs: Dict[str, str] = {}) -> _GeneratorContextManager: my_attrs = {"machine": self.name} my_attrs.update(attrs) return rootlog.nested(msg, my_attrs) def wait_for_monitor_prompt(self) -> str: assert self.monitor is not None answer = "" while True: undecoded_answer = self.monitor.recv(1024) if not undecoded_answer: break answer += undecoded_answer.decode() if answer.endswith("(qemu) "): break return answer def send_monitor_command(self, command: str) -> str: self.run_callbacks() message = f"{command}\n".encode() assert self.monitor is not None self.monitor.send(message) return self.wait_for_monitor_prompt() def wait_for_unit( self, unit: str, user: Optional[str] = None, timeout: int = 900 ) -> None: """Wait for a systemd unit to get into "active" state. Throws exceptions on "failed" and "inactive" states as well as after timing out. """ def check_active(_: Any) -> bool: info = self.get_unit_info(unit, user) state = info["ActiveState"] if state == "failed": raise Exception(f'unit "{unit}" reached state "{state}"') if state == "inactive": status, jobs = self.systemctl("list-jobs --full 2>&1", user) if "No jobs" in jobs: info = self.get_unit_info(unit, user) if info["ActiveState"] == state: raise Exception( f'unit "{unit}" is inactive and there are no pending jobs' ) return state == "active" with self.nested( f"waiting for unit {unit}" + (f" with user {user}" if user is not None else "") ): retry(check_active, timeout) def get_unit_info(self, unit: str, user: Optional[str] = None) -> Dict[str, str]: status, lines = self.systemctl(f'--no-pager show "{unit}"', user) if status != 0: raise Exception( f'retrieving systemctl info for unit "{unit}"' + ("" if user is None else f' under user "{user}"') + f" failed with exit code {status}" ) line_pattern = re.compile(r"^([^=]+)=(.*)$") def tuple_from_line(line: str) -> Tuple[str, str]: match = line_pattern.match(line) assert match is not None return match[1], match[2] return dict( tuple_from_line(line) for line in lines.split("\n") if line_pattern.match(line) ) def systemctl(self, q: str, user: Optional[str] = None) -> Tuple[int, str]: if user is not None: q = q.replace("'", "\\'") return self.execute( f"su -l {user} --shell /bin/sh -c " "$'XDG_RUNTIME_DIR=/run/user/`id -u` " f"systemctl --user {q}'" ) return self.execute(f"systemctl {q}") def require_unit_state(self, unit: str, require_state: str = "active") -> None: with self.nested( f"checking if unit '{unit}' has reached state '{require_state}'" ): info = self.get_unit_info(unit) state = info["ActiveState"] if state != require_state: raise Exception( f"Expected unit '{unit}' to to be in state " f"'{require_state}' but it is in state '{state}'" ) def _next_newline_closed_block_from_shell(self) -> str: assert self.shell output_buffer = [] while True: # This receives up to 4096 bytes from the socket chunk = self.shell.recv(4096) if not chunk: # Probably a broken pipe, return the output we have break decoded = chunk.decode() output_buffer += [decoded] if decoded[-1] == "\n": break return "".join(output_buffer) def execute( self, command: str, check_return: bool = True, timeout: Optional[int] = 900 ) -> Tuple[int, str]: 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}" out_command = ( f"{timeout_str} sh -c {shlex.quote(command)} | (base64 --wrap 0; echo)\n" ) assert self.shell self.shell.send(out_command.encode()) # 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("echo ${PIPESTATUS[0]}\n".encode()) rc = int(self._next_newline_closed_block_from_shell().strip()) return (rc, output.decode(errors="replace")) def shell_interact(self, address: Optional[str] = None) -> None: """Allows you to interact with the guest shell for debugging purposes. @address string passed to socat that will be connected to the guest shell. Check the `Running Tests interactivly` chapter of NixOS manual for an example. """ self.connect() if address is None: address = "READLINE,prompt=$ " 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 interact with QEMU's stdin The shell can be exited with Ctrl+D. Note that Ctrl+C is not allowed to be used. QEMU's stdout is read line-wise. Should only be used during test development, not in the production test.""" 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 each command and check that it succeeds.""" 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: """Execute each command and check that it fails.""" 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: """Wait until a command returns success and return its output. 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: """Wait until a command returns failure. Throws an exception on timeout. """ 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) 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 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) -> 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) def send_chars(self, chars: str, delay: Optional[float] = 0.01) -> None: 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) -> None: """Waits until the file exists in 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) def wait_for_open_port(self, port: int, addr: str = "localhost") -> None: 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) def wait_for_closed_port(self, port: int, addr: str = "localhost") -> None: 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) 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: if self.connected: return with self.nested("waiting for the VM to finish booting"): self.start() assert self.shell tic = time.time() self.shell.recv(1024) # TODO: Timeout 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: word_pattern = re.compile(r"^\w+$") if word_pattern.match(filename): filename = os.path.join(self.out_dir, f"{filename}.png") 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 $(dirname {target})", f"echo -n {content_b64} | base64 -d > {target}", ) def copy_from_host(self, source: str, target: str) -> None: """Copy a file from the host into the guest via the `shared_dir` shared among all the VMs (using a temporary directory). """ host_src = Path(source) vm_target = Path(target) with tempfile.TemporaryDirectory(dir=self.shared_dir) as shared_td: shared_temp = Path(shared_td) host_intermediate = shared_temp / host_src.name vm_shared_temp = Path("/tmp/shared") / shared_temp.name vm_intermediate = vm_shared_temp / host_src.name self.succeed(make_command(["mkdir", "-p", vm_shared_temp])) if host_src.is_dir(): shutil.copytree(host_src, host_intermediate) else: shutil.copy(host_src, host_intermediate) self.succeed(make_command(["mkdir", "-p", vm_target.parent])) self.succeed(make_command(["cp", "-r", vm_intermediate, vm_target])) def copy_from_vm(self, source: str, target_dir: str = "") -> None: """Copy a file from the VM (specified by an in-VM source path) to a path relative to `$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""" 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 self._get_screen_text_variants([0, 1, 2]) def get_screen_text(self) -> str: return self._get_screen_text_variants([2])[0] def wait_for_text(self, regex: str) -> None: 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) def wait_for_console_text(self, regex: str) -> None: with self.nested(f"waiting for {regex} to appear on console"): # Buffer the console output, this is needed # to match multiline regexes. console = io.StringIO() while True: try: console.write(self.last_lines.get()) except queue.Empty: self.sleep(1) continue console.seek(0) matches = re.search(regex, console.read()) if matches is not None: return def send_key( self, key: str, delay: Optional[float] = 0.01, log: Optional[bool] = True ) -> None: 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: assert self.process assert self.process.stdin self.process.stdin.write(chars.encode()) self.process.stdin.flush() def start(self) -> None: 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.shell_path, ) self.monitor, _ = monitor_socket.accept() self.shell, _ = shell_socket.accept() # 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: if not self.booted: return assert self.shell self.shell.send("poweroff\n".encode()) self.wait_for_shutdown() def crash(self) -> None: if not self.booted: return self.log("forced crash") self.send_monitor_command("quit") self.wait_for_shutdown() def wait_for_x(self) -> None: """Wait until it is possible to connect to the X server. Note that testing the existence of /tmp/.X11-unix/X0 is insufficient. """ 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) 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) -> None: 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) 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: """Make the machine unreachable by shutting down eth1 (the multicast interface used to talk to the other VMs). We keep eth0 up so that the test driver can continue to talk to the machine. """ self.send_monitor_command("set_link virtio-net-pci.1 off") def unblock(self) -> None: """Make the machine reachable.""" 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()