18da552952
This way we don't run into any race conditions when individual tests enable the feature. Specifically this affects the initialization of our default store for testing. The test suite *should* not be all that sensitive to the environment, but that's some future work to make sure.
87 lines
3 KiB
Nix
87 lines
3 KiB
Nix
{
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perSystem =
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{
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lib,
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config,
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pkgs,
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...
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}:
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{
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# https://flake.parts/options/nix-cargo-integration
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nci.projects.nix-bindings = {
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path = ./.;
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drvConfig = {
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mkDerivation = {
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buildInputs = [
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# stdbool.h
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pkgs.stdenv.cc
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]
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++ (
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if config.packages.nix ? libs then
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let
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l = config.packages.nix.libs;
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in
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[
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l.nix-expr-c
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l.nix-store-c
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l.nix-util-c
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l.nix-flake-c
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]
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else
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[ config.packages.nix ]
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);
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nativeBuildInputs = [
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pkgs.pkg-config
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];
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# bindgen uses clang to generate bindings, but it doesn't know where to
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# find our stdenv cc's headers, so when it's gcc, we need to tell it.
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postConfigure = lib.optionalString pkgs.stdenv.cc.isGNU ''
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source ${./bindgen-gcc.sh}
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'';
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# Prepare the environment for Nix to work.
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# Nix does not provide a suitable environment for running itself in
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# the sandbox - not by default. We configure it to use a relocated store.
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preCheck = ''
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# nix needs a home directory
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export HOME="$(mktemp -d $TMPDIR/home.XXXXXX)"
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# configure a relocated store
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store_data=$(mktemp -d $TMPDIR/store-data.XXXXXX)
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export NIX_REMOTE="$store_data"
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export NIX_BUILD_HOOK=
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export NIX_CONF_DIR=$store_data/etc
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export NIX_LOCALSTATE_DIR=$store_data/nix/var
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export NIX_LOG_DIR=$store_data/nix/var/log/nix
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export NIX_STATE_DIR=$store_data/nix/var/nix
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echo "Configuring relocated store at $NIX_REMOTE..."
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# Create nix.conf with experimental features enabled
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mkdir -p "$NIX_CONF_DIR"
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echo "experimental-features = ca-derivations flakes" > "$NIX_CONF_DIR/nix.conf"
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# Init ahead of time, because concurrent initialization is flaky
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${
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# Not using nativeBuildInputs because this should (hopefully) be
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# the only place where we need a nix binary. Let's stay in control.
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pkgs.buildPackages.nix
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}/bin/nix-store --init
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echo "Store initialized."
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'';
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};
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# NOTE: duplicated in flake.nix devShell
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env = {
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LIBCLANG_PATH = lib.makeLibraryPath [ pkgs.buildPackages.llvmPackages.clang-unwrapped ];
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BINDGEN_EXTRA_CLANG_ARGS =
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# Work around missing [[deprecated]] in clang
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"-x c++ -std=c++2a";
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}
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// lib.optionalAttrs pkgs.stdenv.cc.isGNU {
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# Avoid cc wrapper, because we only need to add the compiler/"system" dirs
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NIX_CC_UNWRAPPED = "${pkgs.stdenv.cc.cc}/bin/gcc";
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};
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};
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};
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};
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}
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