python-cryptography/vendor_rust.py

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#!/usr/bin/python3
"""Vendor PyCA cryptography's Rust crates
"""
import argparse
import os
import re
import tarfile
import tempfile
import shutil
import subprocess
import sys
VENDOR_DIR = "vendor"
CARGO_TOML = "src/rust/Cargo.toml"
RE_VERSION = re.compile("Version:\s*(.*)")
parser = argparse.ArgumentParser(description="Vendor Rust packages")
parser.add_argument(
"--spec", default="python-cryptography.spec", help="cryptography source tar bundle"
)
def cargo(cmd, manifest):
args = ["cargo", cmd, f"--manifest-path={manifest}"]
return subprocess.check_call(
args, stdout=subprocess.DEVNULL, stderr=sys.stderr, env={}
)
def tar_reset(tarinfo):
"""Reset user, group, mtime, and mode to create reproducible tar"""
tarinfo.uid = 0
tarinfo.gid = 0
tarinfo.uname = "root"
tarinfo.gname = "root"
tarinfo.mtime = 0
if tarinfo.type == tarfile.DIRTYPE:
tarinfo.mode = 0o755
else:
tarinfo.mode = 0o644
if tarinfo.pax_headers:
raise ValueError(tarinfo.name, tarinfo.pax_headers)
return tarinfo
def tar_reproducible(tar, basedir):
"""Create reproducible tar file"""
content = [basedir]
for root, dirs, files in os.walk(basedir):
for directory in dirs:
content.append(os.path.join(root, directory))
for filename in files:
content.append(os.path.join(root, filename))
content.sort()
for fn in content:
tar.add(fn, filter=tar_reset, recursive=False, arcname=fn)
def main():
args = parser.parse_args()
spec = args.spec
# change cwd to work in bundle directory
here = os.path.dirname(os.path.abspath(spec))
os.chdir(here)
# extract version number from bundle name
with open(spec) as f:
for line in f:
mo = RE_VERSION.search(line)
if mo is not None:
version = mo.group(1)
break
else:
raise ValueError(f"Cannot find version in {spec}")
bundle_file = f"cryptography-{version}.tar.gz"
vendor_file = f"cryptography-{version}-vendor.tar.bz2"
# remove existing vendor directory and file
if os.path.isdir(VENDOR_DIR):
shutil.rmtree(VENDOR_DIR)
try:
os.unlink(vendor_file)
except FileNotFoundError:
pass
print(f"Getting crates for {bundle_file}", file=sys.stderr)
# extract tar file in tempdir
# fetch and vendor Rust crates
with tempfile.TemporaryDirectory(dir=here) as tmp:
with tarfile.open(bundle_file) as tar:
tar.extractall(path=tmp)
manifest = os.path.join(tmp, f"cryptography-{version}", CARGO_TOML)
cargo("fetch", manifest)
cargo("vendor", manifest)
print("\nCreating tar ball...", file=sys.stderr)
with tarfile.open(vendor_file, "x:bz2") as tar:
tar_reproducible(tar, VENDOR_DIR)
# remove vendor dir
shutil.rmtree(VENDOR_DIR)
parser.exit(0, f"Created {vendor_file}\n")
if __name__ == "__main__":
main()