File size: 6,621 Bytes
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import hashlib
import json
import shutil
import stat
import tarfile
import tempfile
import zipfile
from dataclasses import dataclass
from pathlib import Path
from urllib.parse import urlparse
from urllib.request import urlopen
from .targets import TargetSpec
DOWNLOAD_TIMEOUT_SECS = 60
@dataclass(frozen=True)
class DotSlashArtifact:
size: int
digest: str
archive_format: str
archive_member: str
url: str
def fetch_dotslash_executable(
spec: TargetSpec,
*,
manifest_path: Path,
artifact_label: str,
cache_key: str,
dest_name: str,
missing_ok: bool = False,
) -> Path | None:
artifact = artifact_for_target(
spec,
manifest_path,
artifact_label=artifact_label,
missing_ok=missing_ok,
)
if artifact is None:
return None
cache_dir = default_cache_root() / cache_key
archive_path = cache_dir / archive_filename(artifact.url)
if not archive_is_valid(archive_path, artifact, artifact_label):
download_archive(artifact.url, archive_path)
try:
verify_archive(archive_path, artifact, artifact_label)
except RuntimeError:
archive_path.unlink(missing_ok=True)
raise
dest = cache_dir / dest_name
extract_archive_member(archive_path, artifact, dest, artifact_label)
if not spec.is_windows:
mode = dest.stat().st_mode
dest.chmod(mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
return dest
def artifact_for_target(
spec: TargetSpec,
manifest_path: Path,
*,
artifact_label: str,
missing_ok: bool = False,
) -> DotSlashArtifact | None:
manifest = load_manifest(manifest_path)
platform_info = manifest.get("platforms", {}).get(spec.dotslash_platform)
if platform_info is None:
if missing_ok:
return None
raise RuntimeError(
f"{artifact_label} manifest {manifest_path} is missing platform "
f"{spec.dotslash_platform!r}"
)
providers = platform_info.get("providers")
if not providers:
raise RuntimeError(
f"{artifact_label} manifest {manifest_path} has no providers for "
f"{spec.dotslash_platform!r}"
)
hash_name = platform_info.get("hash")
if hash_name != "sha256":
raise RuntimeError(
f"Unsupported {artifact_label} hash {hash_name!r} for "
f"{spec.dotslash_platform!r}; expected sha256"
)
return DotSlashArtifact(
size=int(platform_info["size"]),
digest=str(platform_info["digest"]),
archive_format=str(platform_info["format"]),
archive_member=str(platform_info["path"]),
url=str(providers[0]["url"]),
)
def load_manifest(manifest_path: Path) -> dict:
text = manifest_path.read_text(encoding="utf-8")
if text.startswith("#!"):
text = "\n".join(text.splitlines()[1:])
return json.loads(text)
def default_cache_root() -> Path:
return Path(tempfile.gettempdir()) / "codex-package"
def archive_filename(url: str) -> str:
filename = Path(urlparse(url).path).name
if not filename:
raise RuntimeError(f"Unable to determine archive filename from {url}")
return filename
def archive_is_valid(
archive_path: Path,
artifact: DotSlashArtifact,
artifact_label: str,
) -> bool:
if not archive_path.is_file():
return False
try:
verify_archive(archive_path, artifact, artifact_label)
except RuntimeError:
archive_path.unlink(missing_ok=True)
return False
return True
def verify_archive(
archive_path: Path,
artifact: DotSlashArtifact,
artifact_label: str,
) -> None:
actual_size = archive_path.stat().st_size
if actual_size != artifact.size:
raise RuntimeError(
f"{artifact_label} archive {archive_path} has size {actual_size}, "
f"expected {artifact.size}"
)
digest = hashlib.sha256()
with open(archive_path, "rb") as fh:
for chunk in iter(lambda: fh.read(1024 * 1024), b""):
digest.update(chunk)
actual_digest = digest.hexdigest()
if actual_digest != artifact.digest:
raise RuntimeError(
f"{artifact_label} archive {archive_path} has sha256 {actual_digest}, "
f"expected {artifact.digest}"
)
def download_archive(url: str, archive_path: Path) -> None:
archive_path.parent.mkdir(parents=True, exist_ok=True)
temp_path = archive_path.with_suffix(f"{archive_path.suffix}.tmp")
temp_path.unlink(missing_ok=True)
try:
with urlopen(url, timeout=DOWNLOAD_TIMEOUT_SECS) as response:
with open(temp_path, "wb") as out:
shutil.copyfileobj(response, out)
temp_path.replace(archive_path)
finally:
temp_path.unlink(missing_ok=True)
def extract_archive_member(
archive_path: Path,
artifact: DotSlashArtifact,
dest: Path,
artifact_label: str,
) -> None:
dest.parent.mkdir(parents=True, exist_ok=True)
dest.unlink(missing_ok=True)
if artifact.archive_format == "tar.gz":
with tarfile.open(archive_path, "r:gz") as archive:
try:
member = archive.getmember(artifact.archive_member)
except KeyError as exc:
raise RuntimeError(
f"{artifact_label} archive {archive_path} is missing "
f"{artifact.archive_member!r}"
) from exc
extracted = archive.extractfile(member)
if extracted is None:
raise RuntimeError(
f"{artifact_label} archive member {artifact.archive_member!r} is not a file"
)
with extracted, open(dest, "wb") as out:
shutil.copyfileobj(extracted, out)
return
if artifact.archive_format == "zip":
with zipfile.ZipFile(archive_path) as archive:
try:
with archive.open(artifact.archive_member) as extracted:
with open(dest, "wb") as out:
shutil.copyfileobj(extracted, out)
except KeyError as exc:
raise RuntimeError(
f"{artifact_label} archive {archive_path} is missing "
f"{artifact.archive_member!r}"
) from exc
return
raise RuntimeError(
f"Unsupported {artifact_label} archive format {artifact.archive_format!r}; "
"expected tar.gz or zip"
)
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