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ci/nix: downgrade python to 3.9, enforce in scripts #639

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2 changes: 2 additions & 0 deletions ci/build.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@
import sys
import contextlib

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[1].as_posix())

from ci.lib.runner import ArgparseActionList, TestConfig, matrix_product
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2 changes: 2 additions & 0 deletions ci/examples/blk.py
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Expand Up @@ -10,6 +10,8 @@
import tempfile
import types

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[2].as_posix())

from ci.lib.backends import *
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2 changes: 2 additions & 0 deletions ci/examples/echo_server.py
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Expand Up @@ -7,6 +7,8 @@
from pathlib import Path
import sys

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[2].as_posix())

from ci.lib.backends import *
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2 changes: 2 additions & 0 deletions ci/examples/i2c.py
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Expand Up @@ -6,6 +6,8 @@
from pathlib import Path
import sys

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[2].as_posix())

from ci.lib.backends import *
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2 changes: 2 additions & 0 deletions ci/examples/i2c_bus_scan.py
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Expand Up @@ -6,6 +6,8 @@
from pathlib import Path
import sys

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[2].as_posix())

from ci.lib.backends import *
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2 changes: 2 additions & 0 deletions ci/examples/serial.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@
from pathlib import Path
import sys

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[2].as_posix())

from ci.lib.backends import *
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2 changes: 2 additions & 0 deletions ci/examples/timer.py
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Expand Up @@ -6,6 +6,8 @@
from pathlib import Path
import sys

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[2].as_posix())

from ci.lib.backends import *
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2 changes: 2 additions & 0 deletions ci/run.py
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Expand Up @@ -7,6 +7,8 @@
from pathlib import Path
import sys

assert list(map(int, sys.version.split(" ")[0].split("."))) > [3, 9, 0]

sys.path.insert(1, Path(__file__).parents[1].as_posix())

from ci.common import TestConfig, backend_fn
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17 changes: 17 additions & 0 deletions flake.lock
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19 changes: 17 additions & 2 deletions flake.nix
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Expand Up @@ -7,6 +7,8 @@

inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
# Python 3.9 is not in the official repo anymore
python39.url = "github:NixOS/nixpkgs/c5dd43934613ae0f8ff37c59f61c507c2e8f980d";
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@midnightveil midnightveil Feb 13, 2026

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this is going to download duplicates of everything including entire libc and everything, which is a lot of extra things to download

zig-overlay.url = "github:mitchellh/zig-overlay";
zig-overlay.inputs.nixpkgs.follows = "nixpkgs";
sdfgen.url = "github:au-ts/microkit_sdf_gen/0.28.1";
Expand All @@ -16,6 +18,7 @@
outputs =
{
nixpkgs,
python39,
zig-overlay,
sdfgen,
...
Expand All @@ -39,13 +42,16 @@
pkgs = import nixpkgs {
inherit system;
};
pkgs39 = import python39 {
inherit system;
};

llvm = pkgs.llvmPackages_18;
zig = zig-overlay.packages.${system}."0.15.1";

pysdfgen = sdfgen.packages.${system}.pysdfgen.override {
zig = zig;
pythonPackages = pkgs.python312Packages;
pythonPackages = pkgs39.python39Packages;
};

clang-complete = (pkgs.symlinkJoin {
Expand Down Expand Up @@ -73,9 +79,16 @@

genmc = pkgs.callPackage ./ci/genmc/nix/package.nix { inherit clang-complete; llvm = pkgs.llvmPackages_20.llvm; };

pythonTool = pkgs.python312.withPackages (ps: [
pythonTool = pkgs39.python39.withPackages (ps: [
pysdfgen
]);
## Fixup python and python3 resolving
pythonShim = pkgs.writeShellScriptBin "python" ''
exec ${pythonTool}/bin/python3 "$@"
'';
python3Shim = pkgs.writeShellScriptBin "python3" ''
exec ${pythonTool}/bin/python3 "$@"
'';
in
{
genmc = pkgs.mkShell rec {
Expand Down Expand Up @@ -131,6 +144,8 @@
llvm.libllvm
dtc
pythonTool
pythonShim
python3Shim
];

# To avoid Nix adding compiler flags that are not available on a freestanding
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