conduit/flake.nix

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{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
flake-utils.url = "github:numtide/flake-utils";
nix-filter.url = "github:numtide/nix-filter";
fenix = {
url = "github:nix-community/fenix";
inputs.nixpkgs.follows = "nixpkgs";
};
crane = {
# TODO: Switch back to upstream after [this issue][0] is fixed
#
# [0]: https://github.com/ipetkov/crane/issues/497
url = "github:CobaltCause/crane?ref=crimes-for-cross";
inputs.nixpkgs.follows = "nixpkgs";
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};
attic.url = "github:zhaofengli/attic?ref=main";
};
outputs =
{ self
, nixpkgs
, flake-utils
, nix-filter
, fenix
, crane
, ...
}: flake-utils.lib.eachDefaultSystem (system:
let
pkgsHost = nixpkgs.legacyPackages.${system};
# Nix-accessible `Cargo.toml`
cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
# The Rust toolchain to use
toolchain = fenix.packages.${system}.fromToolchainFile {
file = ./rust-toolchain.toml;
# See also `rust-toolchain.toml`
sha256 = "sha256-gdYqng0y9iHYzYPAdkC/ka3DRny3La/S5G8ASj0Ayyc=";
};
builder = pkgs:
((crane.mkLib pkgs).overrideToolchain toolchain).buildPackage;
nativeBuildInputs = pkgs: [
# bindgen needs the build platform's libclang. Apparently due to
# "splicing weirdness", pkgs.rustPlatform.bindgenHook on its own doesn't
# quite do the right thing here.
pkgs.buildPackages.rustPlatform.bindgenHook
];
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env = pkgs: {
ROCKSDB_INCLUDE_DIR = "${pkgs.rocksdb}/include";
ROCKSDB_LIB_DIR = "${pkgs.rocksdb}/lib";
}
// pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isStatic {
ROCKSDB_STATIC = "";
}
// {
CARGO_BUILD_RUSTFLAGS = let inherit (pkgs) lib stdenv; in
lib.concatStringsSep " " ([]
++ lib.optionals
# This disables PIE for static builds, which isn't great in terms
# of security. Unfortunately, my hand is forced because nixpkgs'
# `libstdc++.a` is built without `-fPIE`, which precludes us from
# leaving PIE enabled.
stdenv.hostPlatform.isStatic
["-C" "relocation-model=static"]
++ lib.optionals
(stdenv.buildPlatform.config != pkgs.stdenv.hostPlatform.config)
["-l" "c"]
++ lib.optionals
# This check has to match the one [here][0]. We only need to set
# these flags when using a different linker. Don't ask me why,
# though, because I don't know. All I know is it breaks otherwise.
#
# [0]: https://github.com/NixOS/nixpkgs/blob/612f97239e2cc474c13c9dafa0df378058c5ad8d/pkgs/build-support/rust/lib/default.nix#L36-L39
(
pkgs.stdenv.hostPlatform.isAarch64
&& pkgs.stdenv.hostPlatform.isStatic
&& !pkgs.stdenv.isDarwin
&& !pkgs.stdenv.cc.bintools.isLLVM
)
[
"-l"
"stdc++"
"-L"
"${stdenv.cc.cc.lib}/${stdenv.hostPlatform.config}/lib"
]
);
}
# What follows is stolen from [here][0]. Its purpose is to properly
# configure compilers and linkers for various stages of the build, and
# even covers the case of build scripts that need native code compiled and
# run on the build platform (I think).
#
# [0]: https://github.com/NixOS/nixpkgs/blob/612f97239e2cc474c13c9dafa0df378058c5ad8d/pkgs/build-support/rust/lib/default.nix#L64-L78
// (
let
inherit (pkgs.rust.lib) envVars;
in
pkgs.lib.optionalAttrs
(pkgs.stdenv.targetPlatform.rust.rustcTarget
!= pkgs.stdenv.hostPlatform.rust.rustcTarget)
(
let
inherit (pkgs.stdenv.targetPlatform.rust) cargoEnvVarTarget;
in
{
"CC_${cargoEnvVarTarget}" = envVars.ccForTarget;
"CXX_${cargoEnvVarTarget}" = envVars.cxxForTarget;
"CARGO_TARGET_${cargoEnvVarTarget}_LINKER" =
envVars.linkerForTarget;
}
)
// (
let
inherit (pkgs.stdenv.hostPlatform.rust) cargoEnvVarTarget rustcTarget;
in
{
"CC_${cargoEnvVarTarget}" = envVars.ccForHost;
"CXX_${cargoEnvVarTarget}" = envVars.cxxForHost;
"CARGO_TARGET_${cargoEnvVarTarget}_LINKER" = envVars.linkerForHost;
CARGO_BUILD_TARGET = rustcTarget;
}
)
// (
let
inherit (pkgs.stdenv.buildPlatform.rust) cargoEnvVarTarget;
in
{
"CC_${cargoEnvVarTarget}" = envVars.ccForBuild;
"CXX_${cargoEnvVarTarget}" = envVars.cxxForBuild;
"CARGO_TARGET_${cargoEnvVarTarget}_LINKER" = envVars.linkerForBuild;
HOST_CC = "${pkgs.buildPackages.stdenv.cc}/bin/cc";
HOST_CXX = "${pkgs.buildPackages.stdenv.cc}/bin/c++";
}
));
package = pkgs: builder pkgs {
src = nix-filter {
root = ./.;
include = [
"src"
"Cargo.toml"
"Cargo.lock"
];
};
# This is redundant with CI
doCheck = false;
env = env pkgs;
nativeBuildInputs = nativeBuildInputs pkgs;
meta.mainProgram = cargoToml.package.name;
};
in
{
packages = {
default = package pkgsHost;
oci-image =
let
package = self.packages.${system}.default;
in
pkgsHost.dockerTools.buildImage {
name = package.pname;
tag = "latest";
config = {
# Use the `tini` init system so that signals (e.g. ctrl+c/SIGINT)
# are handled as expected
Entrypoint = [
"${pkgsHost.lib.getExe' pkgsHost.tini "tini"}"
"--"
];
Cmd = [
"${pkgsHost.lib.getExe package}"
];
};
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};
} // builtins.listToAttrs (
builtins.map
(crossSystem: {
name = "static-${crossSystem}";
value = package (import nixpkgs {
inherit system;
crossSystem = {
config = crossSystem;
};
}).pkgsStatic;
})
[
"x86_64-unknown-linux-musl"
"aarch64-unknown-linux-musl"
]
);
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devShells.default = pkgsHost.mkShell {
env = env pkgsHost // {
# Rust Analyzer needs to be able to find the path to default crate
# sources, and it can read this environment variable to do so. The
# `rust-src` component is required in order for this to work.
RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
};
# Development tools
nativeBuildInputs = nativeBuildInputs pkgsHost ++ [
# Always use nightly rustfmt because most of its options are unstable
#
# This needs to come before `toolchain` in this list, otherwise
# `$PATH` will have stable rustfmt instead.
fenix.packages.${system}.latest.rustfmt
toolchain
] ++ (with pkgsHost; [
engage
]);
};
});
}