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#!/usr/bin/env python3
"""
Compare checksums for wheels in :mod:`ensurepip` against the Cheeseshop.
When GitHub Actions executes the script, output is formatted accordingly.
https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-a-notice-message
"""
import hashlib
import json
import os
import re
from pathlib import Path
from urllib.request import urlopen
PACKAGE_NAMES = ("pip",)
ENSURE_PIP_ROOT = Path(__file__).parent.parent.parent / "Lib/ensurepip"
WHEEL_DIR = ENSURE_PIP_ROOT / "_bundled"
ENSURE_PIP_INIT_PY_TEXT = (ENSURE_PIP_ROOT / "__init__.py").read_text(encoding="utf-8")
GITHUB_ACTIONS = os.getenv("GITHUB_ACTIONS") == "true"
def print_notice(file_path: str, message: str) -> None:
if GITHUB_ACTIONS:
message = f"::notice file={file_path}::{message}"
print(message, end="\n\n")
def print_error(file_path: str, message: str) -> None:
if GITHUB_ACTIONS:
message = f"::error file={file_path}::{message}"
print(message, end="\n\n")
def verify_wheel(package_name: str) -> bool:
# Find the package on disk
package_paths = list(WHEEL_DIR.glob(f"{package_name}*.whl"))
if len(package_paths) != 1:
if package_paths:
for p in package_paths:
print_error(p, f"Found more than one wheel for package {package_name}.")
else:
print_error("", f"Could not find a {package_name} wheel on disk.")
return False
package_path = package_paths[0]
print(f"Verifying checksum for {package_path}.")
# Find the version of the package used by ensurepip
package_version_match = re.search(
f'_{package_name.upper()}_VERSION = "([^"]+)', ENSURE_PIP_INIT_PY_TEXT
)
if not package_version_match:
print_error(
package_path,
f"No {package_name} version found in Lib/ensurepip/__init__.py.",
)
return False
package_version = package_version_match[1]
# Get the SHA 256 digest from the Cheeseshop
try:
raw_text = urlopen(f"https://pypi.org/pypi/{package_name}/json").read()
except (OSError, ValueError):
print_error(package_path, f"Could not fetch JSON metadata for {package_name}.")
return False
release_files = json.loads(raw_text)["releases"][package_version]
for release_info in release_files:
if package_path.name != release_info["filename"]:
continue
expected_digest = release_info["digests"].get("sha256", "")
break
else:
print_error(package_path, f"No digest for {package_name} found from PyPI.")
return False
# Compute the SHA 256 digest of the wheel on disk
actual_digest = hashlib.sha256(package_path.read_bytes()).hexdigest()
print(f"Expected digest: {expected_digest}")
print(f"Actual digest: {actual_digest}")
if actual_digest != expected_digest:
print_error(
package_path, f"Failed to verify the checksum of the {package_name} wheel."
)
return False
print_notice(
package_path,
f"Successfully verified the checksum of the {package_name} wheel.",
)
return True
if __name__ == "__main__":
exit_status = 0
for package_name in PACKAGE_NAMES:
if not verify_wheel(package_name):
exit_status = 1
raise SystemExit(exit_status)
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