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python3 library build is not deterministic #107951

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raboof opened this issue Dec 30, 2020 · 2 comments · Fixed by #107965
Closed

python3 library build is not deterministic #107951

raboof opened this issue Dec 30, 2020 · 2 comments · Fixed by #107965
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0.kind: bug 6.topic: python 6.topic: reproducible builds

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@raboof
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raboof commented Dec 30, 2020

Describe the bug

When building python3 twice, the result is not always bit-by-bit the same. This makes it harder to audit whether binaries/images have been built correctly. For more information on why this is useful see https://reproducible-builds.org .

To Reproduce

nix-build '<nixpkgs>' -A python3 --check

Additional context

Notably, the ordering of some symbols (​_Py_Mangle, ​PyEval_GetGlobals, several _PyErr ones) is not stable.

Setting enableParallelBuilding to false doesn't help.
@FRidh
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FRidh commented Dec 30, 2020

I've got it reproducible again. Opening a PR soon. Some people are not going to like it though...

@FRidh
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FRidh commented Dec 30, 2020

#107965

@prusnak prusnak linked a pull request Dec 30, 2020 that will close this issue
[reverted] python2 and python3: reproducible builds #107965
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@raboof raboof closed this as completed Apr 26, 2021
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[reverted] python2 and python3: reproducible builds FRidh/nixpkgs
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@raboof @veprbl @FRidh