[2676902576] Upstream Reporter: Shubh Bapna
Upstream description:

Currently the cache wheel feature in bootstrap uses the wheel command to unpack the wheel and extract the build requirements. Using the wheel command requires spawning a child process which is expensive compared to using the zipfile library. There is almost a 90% difference when running this script:

```python3
import pathlib
import shutil
import time
import zipfile

import dependencies
import external_commands
import wheels

whl = "e2e-output/wheels-repo/downloads/setuptools-75.6.0-0-py3-none-any.whl"
unpack_dir = pathlib.Path("unpack_dir")
unpack_dir.mkdir()

dist_name, dist_version, build_tag, _ = wheels.extract_info_from_wheel_file(
None, pathlib.Path(whl)
)
dist_filename = f"

Unknown macro: {dist_name}

-

Unknown macro: {dist_version}

"
metadata_dir = pathlib.Path(f"

Unknown macro: {dist_filename}

.dist-info")

start = time.perf_counter()
external_commands.run(
["wheel", "unpack", whl, "--dest", str(unpack_dir)],
)
shutil.copy(
unpack_dir
/ dist_filename
/ metadata_dir
/ f"

Unknown macro: {wheels.FROMAGER_BUILD_REQ_PREFIX}

-

Unknown macro: {dependencies.BUILD_SYSTEM_REQ_FILE_NAME}

",
unpack_dir / dependencies.BUILD_SYSTEM_REQ_FILE_NAME,
)
shutil.copy(
unpack_dir
/ dist_filename
/ metadata_dir
/ f"

-

Unknown macro: {dependencies.BUILD_BACKEND_REQ_FILE_NAME}

",
unpack_dir / dependencies.BUILD_BACKEND_REQ_FILE_NAME,
)
shutil.copy(
unpack_dir
/ dist_filename
/ metadata_dir
/ f"

Unknown macro: {wheels.FROMAGER_BUILD_REQ_PREFIX}

-

Unknown macro: {dependencies.BUILD_SDIST_REQ_FILE_NAME}

",
unpack_dir / dependencies.BUILD_SDIST_REQ_FILE_NAME,
)
end = time.perf_counter()
external = end - start

shutil.rmtree(str(unpack_dir))
unpack_dir.mkdir()

start = time.perf_counter()
archive = zipfile.ZipFile(whl)
archive.extract(
str(
metadata_dir
/ f"

-

Unknown macro: {dependencies.BUILD_SYSTEM_REQ_FILE_NAME}

"
),
unpack_dir,
)
archive.extract(
str(
metadata_dir
/ f"

Unknown macro: {wheels.FROMAGER_BUILD_REQ_PREFIX}

-

Unknown macro: {dependencies.BUILD_SDIST_REQ_FILE_NAME}

"
),
unpack_dir,
)
archive.extract(
str(
metadata_dir
/ f"

-

"
),
unpack_dir,
)
end = time.perf_counter()
zip = end - start

print(f"external command:

Unknown macro: {external}

")
print(f"zipfile:

Unknown macro: {zip}

")
print(f"zipfile is faster by:

Unknown macro: {(external - zip) / external * 100}

")

```