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Provides uv, a matching Python interpreter, and a Rust toolchain via a devShell, plus the shared libraries (libstdc++, zlib, openssl) that compiled Python wheels (pyarrow, duckdb, polars, ...) need at runtime but that NixOS doesn't put on a standard FHS path. Scoped to this project only via .envrc/direnv; verified end-to-end with uv sync, maturin develop, and the full pytest suite. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
flake.nix(+flake.lock) providing a devShell withuv, a matching Python interpreter, and a Rust toolchain, plus the shared libraries (libstdc++,zlib,openssl) compiled Python wheels (pyarrow, duckdb, polars, ...) need at runtime that NixOS doesn't expose on a standard FHS path..envrc(use flake) so the shell auto-loads via direnv only when inside this project directory, and unloads on leaving it — no global system changes.nix developpaths inCONTRIBUTING.md..direnv/(direnv's local, machine-specific cache).Test plan
nix developenters cleanly, providinguv,python3(3.11),rustc,cargo,pkg-configuv sync --dev --no-install-package xarray-sqlsucceeds inside the shelluv run --no-project maturin develop --uvcompiles the Rust extension successfullyuv run --no-project pytest -v . -m "not integration"passes (359 passed, 1 skipped)🤖 Generated with Claude Code