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fix: make package archives deterministic #4

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Merged
sabraman merged 1 commit into from
May 15, 2026
Merged

fix: make package archives deterministic #4

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7 changes: 6 additions & 1 deletion tools/build_package.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
import hashlib
import json
import re
import stat
import sys
import zipfile
from pathlib import Path
Expand All @@ -21,6 +22,7 @@
MAX_ARCHIVE_UNCOMPRESSED_BYTES = 512 * 1024
MAX_ARCHIVE_ENTRY_BYTES = 128 * 1024
MAX_ARCHIVE_RELATIVE_PATH_BYTES = 180
ZIP_EPOCH = (1980, 1, 1, 0, 0, 0)


def load_json(path: Path) -> object:
Expand Down Expand Up @@ -111,7 +113,10 @@ def build_archive(package_dir: Path, output_dir: Path, profile: str) -> dict[str
with zipfile.ZipFile(archive_path, "w", compression=zipfile.ZIP_DEFLATED) as archive:
for path in files:
rel = path.relative_to(package_dir).as_posix()
archive.write(path, rel)
info = zipfile.ZipInfo(rel, date_time=ZIP_EPOCH)
info.compress_type = zipfile.ZIP_DEFLATED
info.external_attr = (stat.S_IMODE(path.stat().st_mode) & 0o777) << 16
archive.writestr(info, path.read_bytes())

return {
"id": manifest["id"],
Expand Down