cloud-hypervisor/scripts/fetch_workloads.py at main · cocoonstack/cloud-hypervisor · GitHub

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#!/usr/bin/env python3

# SPDX-License-Identifier: Apache-2.0

"""Download workload assets for Cloud Hypervisor integration tests.

Reads scripts/test_assets.yaml, downloads missing files, and verifies

SHA-1 and/or SHA-256 checksums. Uses only the Python 3 standard library.

Usage:

fetch_workloads.py [--arch ARCH] [--test TEST] [--workloads-dir DIR]

[--verify-only] [--asset-file FILE] [-j JOBS]

"""

from __future__ import annotations

import argparse

import concurrent.futures

import hashlib

import os

import platform

import re

import sys

import threading

import time

import urllib.error

import urllib.parse

import urllib.request

from pathlib import Path

_print_lock = threading.Lock()

def parse_yaml(path: Path) -> list[dict]:

"""Minimal parser for the flat asset list in test_assets.yaml.

Handles only the subset of YAML used by this project: a top-level

``assets:`` key containing a list of mappings with scalar and

flow-sequence values. Does not handle nested structures, multi-line

strings, or anchors.

"""

assets: list[dict] = []

current: dict | None = None

with open(path) as f:

for line in f:

stripped = line.strip()

if not stripped or stripped.startswith("#"):

continue

if stripped == "assets:":

continue

if stripped.startswith("- "):

if current is not None:

assets.append(current)

current = {}

stripped = stripped[2:].strip()

if not stripped:

continue

if current is None:

continue

m = re.match(r"([a-zA-Z_]\w*):\s*(.*)", stripped)

if not m:

continue

key, value = m.group(1), m.group(2)

# Flow-sequence: [a, b, c]

seq = re.match(r"\[([^\]]*)\]", value)

if seq:

items = [s.strip() for s in seq.group(1).split(",") if s.strip()]

current[key] = items

else:

current[key] = value if value else None

if current is not None:

assets.append(current)

return assets

def verify_checksums(path: Path, expected: dict[str, str]) -> list[str]:

"""Return descriptions of any checksum mismatches for *path*."""

hashers = {algorithm: hashlib.new(algorithm) for algorithm in expected}

with open(path, "rb") as f:

while True:

chunk = f.read(1 << 20)

if not chunk:

break

for hasher in hashers.values():

hasher.update(chunk)

mismatches = []

for algorithm, expected_digest in expected.items():

actual_digest = hashers[algorithm].hexdigest()

if actual_digest != expected_digest:

mismatches.append(

f"{algorithm}: expected {expected_digest}, got {actual_digest}"

)

return mismatches

def _fmt_size(n: int) -> str:

size = float(n)

for unit in ("B", "KiB", "MiB", "GiB"):

if size < 1024:

return f"{size:.1f} {unit}"

size /= 1024

return f"{size:.1f} TiB"

def _log(msg: str, **kwargs) -> None:

with _print_lock:

print(msg, **kwargs)

def _log_err(msg: str) -> None:

with _print_lock:

print(msg, file=sys.stderr)

def download(url: str, dest: Path, auth_token: str | None = None,

retries: int = 3, delay: float = 5.0,

show_progress: bool = True) -> bool:

"""Download *url* to *dest* with retries. Returns True on success."""

tmp = dest.parent / (dest.name + ".part")

headers = {}

host = urllib.parse.urlparse(url).hostname or ""

if auth_token and (host == "github.com" or host.endswith(".github.com")):

headers["Authorization"] = f"token {auth_token}"

for attempt in range(1, retries + 1):

try:

req = urllib.request.Request(url, headers=headers)

_log(f" Downloading {url} (attempt {attempt}/{retries})")

t0 = time.monotonic()

with urllib.request.urlopen(req, timeout=300) as resp, \

open(tmp, "wb") as out:

total = resp.headers.get("Content-Length")

total = int(total) if total else None

downloaded = 0

while True:

chunk = resp.read(1 << 20)

if not chunk:

break

out.write(chunk)

downloaded += len(chunk)

if show_progress:

with _print_lock:

if total:

pct = downloaded * 100 // total

print(f"\r {_fmt_size(downloaded)} / "

f"{_fmt_size(total)} ({pct}%)",

end="", flush=True)

else:

print(f"\r {_fmt_size(downloaded)}",

end="", flush=True)

elapsed = time.monotonic() - t0

if show_progress:

with _print_lock:

print()

_log(f" {_fmt_size(downloaded)} in {elapsed:.1f}s")

except (urllib.error.URLError, OSError, TimeoutError) as e:

_log_err(f" Attempt {attempt} failed: {e}")

tmp.unlink(missing_ok=True)

if attempt < retries:

time.sleep(delay)

continue

tmp.rename(dest)

return True

return False

def process_asset(asset: dict, workloads: Path, auth_token: str | None,

verify_only: bool, show_progress: bool) -> bool:

"""Process a single asset. Returns True on success."""

filename = asset["filename"]

if ".." in Path(filename).parts:

_log(f"SKIPPED {filename}: path traversal in filename")

return False

url = asset.get("url")

expected_checksums = {

algorithm: asset[algorithm]

for algorithm in ("sha1", "sha256")

if asset.get(algorithm)

}

dest = workloads / filename

if not expected_checksums:

_log(f"INVALID {filename}: sha1 or sha256 checksum required")

return False

if dest.exists():

mismatches = verify_checksums(dest, expected_checksums)

if mismatches:

_log(f"MISMATCH {filename}: {'; '.join(mismatches)}")

if verify_only:

return False

dest.unlink()

else:

_log(f"OK {filename}")

return True

if verify_only:

_log(f"MISSING {filename}")

return False

if not url:

_log(f"MISSING {filename} (no URL to download from)")

return False

if not download(url, dest, auth_token, show_progress=show_progress):

_log(f"FAILED {filename}")

return False

mismatches = verify_checksums(dest, expected_checksums)

if mismatches:

_log(f"CORRUPT {filename}: {'; '.join(mismatches)}")

dest.unlink()

return False

if (asset.get("executable") or "").lower() == "true":

dest.chmod(0o755)

_log(f"FETCHED {filename}")

return True

def main() -> int:

parser = argparse.ArgumentParser(description=__doc__)

parser.add_argument("--arch", default=platform.machine(),

help="Target architecture (default: host arch)")

parser.add_argument("--test", dest="test_filter", default=None,

help="Only fetch assets for this test group")

parser.add_argument("--workloads-dir", default=None,

help="Directory to store assets (default: ~/workloads)")

parser.add_argument("--verify-only", action="store_true",

help="Check existing files without downloading")

parser.add_argument("--asset-file", default=None,

help="Path to test_assets.yaml (default: alongside this script)")

parser.add_argument("-j", "--jobs", type=int, default=os.cpu_count() or 1,

help="Parallel downloads (default: number of CPUs, use 1 to disable)")

args = parser.parse_args()

script_dir = Path(__file__).resolve().parent

asset_file = Path(args.asset_file) if args.asset_file else script_dir / "test_assets.yaml"

if not asset_file.exists():

print(f"Error: asset file not found: {asset_file}", file=sys.stderr)

return 1

if args.workloads_dir:

workloads = Path(args.workloads_dir)

else:

workloads = Path.home() / "workloads"

workloads.mkdir(parents=True, exist_ok=True)

assets = parse_yaml(asset_file)

auth_token = os.environ.get("AUTH_DOWNLOAD_TOKEN")

filtered = []

for asset in assets:

arch_list = asset.get("arch") or []

if arch_list and args.arch not in arch_list:

continue

if args.test_filter:

test_list = asset.get("test") or []

if test_list and args.test_filter not in test_list:

continue

filtered.append(asset)

if not filtered:

print(f"No assets match arch={args.arch}"

+ (f" test={args.test_filter}" if args.test_filter else ""))

return 0

jobs = max(1, args.jobs)

show_progress = jobs == 1

errors = 0

with concurrent.futures.ThreadPoolExecutor(max_workers=jobs) as pool:

futures = {

pool.submit(process_asset, asset, workloads, auth_token,

args.verify_only, show_progress): asset

for asset in filtered

}

for f in concurrent.futures.as_completed(futures):

try:

if not f.result():

errors += 1

except Exception as e:

asset = futures[f]

_log_err(f"EXCEPTION {asset.get('filename', '?')}: {e}")

errors += 1

if errors:

print(f"\n{errors} error(s)")

return 1

return 0

if __name__ == "__main__":

sys.exit(main())

cloud-hypervisor/scripts/fetch_workloads.py at main · cocoonstack/cloud-hypervisor · GitHub

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