chore: import upstream snapshot with attribution

bazel/pyzip.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+# This script is used to zip a directory into a zip file.
+# It only uses python standard library, so it can be portable and used in bazel.
+
+import os
+import os.path
+import sys
+import zipfile
+
+# Everything in the zip file is stored with this timestamp.
+# This makes the zip file building deterministic and reproducible.
+_TIMESTAMP = (2020, 1, 1, 0, 0, 0)
+
+_UNIX_DIR_BIT = 0o040000
+_MSDOS_DIR_BIT = 0x10
+_DIR_BIT = (_UNIX_DIR_BIT << 16) | _MSDOS_DIR_BIT | (0o755 << 16)
+
+_FILE_BIT = (0o100000 << 16) | (0o644 << 16)
+
+
+def zip_dir(dir_path: str, output_zip_path: str):
+    with zipfile.ZipFile(output_zip_path, "w") as output:
+        for root, _, files in os.walk(dir_path):
+            if root != dir_path:
+                dir_zip_path = os.path.relpath(root, dir_path)
+                dir_zip_info = zipfile.ZipInfo(dir_zip_path + "/", date_time=_TIMESTAMP)
+                dir_zip_info.external_attr |= _DIR_BIT
+                dir_zip_info.flag_bits |= 0x800  # UTF-8 encoded file name.
+                output.writestr(dir_zip_info, "", compress_type=zipfile.ZIP_STORED)
+
+            for f in files:
+                file_path = os.path.join(root, f)
+                zip_path = os.path.relpath(file_path, dir_path)
+                zip_info = zipfile.ZipInfo(zip_path, date_time=_TIMESTAMP)
+                zip_info.flag_bits |= 0x800  # UTF-8 encoded file name.
+                zip_info.external_attr |= _FILE_BIT
+
+                with open(file_path, "rb") as f:
+                    content = f.read()
+                output.writestr(zip_info, content, compress_type=zipfile.ZIP_STORED)
+
+
+if __name__ == "__main__":
+    zip_dir(sys.argv[1], sys.argv[2])