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RFC: disable compression in macOS gen-sdk script

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Starting with Python 3.11, Pythons gzip might delegate to zlib.
Depending on the OS, i.e Ubuntu vs Fedora, the underlying zlib
implementation might differ, resulting in different output.

For now, or until a better solution exists, disable compression. This
results in the SDK increasing in size to ~230mb. Which is not
unreasonable, to regain determinism (and would be significantly worse
without the previous commit).

See: https://docs.python.org/3/library/gzip.html#gzip.compress
This commit is contained in:
fanquake 2025-03-06 16:02:12 +00:00
parent 6998e933f9
commit 20778eb023
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2 changed files with 3 additions and 3 deletions
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2
contrib/macdeploy/README.md
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@ -52,7 +52,7 @@ path to `Xcode.app` (extracted in the previous stage) as the first argument.
```
The generated archive should be: `Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers.tar.gz`.
The `sha256sum` should be `250cc83511f8548c8a91012f143a17ad38910fc8f14b45f28240ec46df612697`.
The `sha256sum` should be `2184c9699203ca32521899ca0deec831f2b6af214549c85bfad6ef8554d7778e`.
## Deterministic macOS App Notes

4
contrib/macdeploy/gen-sdk
View file

@ -54,7 +54,7 @@ def run():
out_sdktgz_path = pathlib.Path("./{}.tar.gz".format(out_name))
def tarfp_add_with_base_change(tarfp, dir_to_add, alt_base_dir):
"""Add all files in dir_to_add to tarfp, but prepent alt_base_dir to the files'
"""Add all files in dir_to_add to tarfp, but prepend alt_base_dir to the files'
names
e.g. if the only file under /root/bazdir is /root/bazdir/qux, invoking:
@ -87,7 +87,7 @@ def run():
print("Creating output .tar.gz file...")
with out_sdktgz_path.open("wb") as fp:
with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=9, mtime=0) as gzf:
with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=0, mtime=0) as gzf:
with tarfile.open(mode="w", fileobj=gzf, format=tarfile.GNU_FORMAT) as tarfp:
print("Adding MacOSX SDK {} files...".format(sdk_version))
tarfp_add_with_base_change(tarfp, sdk_dir, out_name)