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flake.nix
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flake.nix
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{
description = "A process I/O multiplexer";
inputs.nixpkgs.url = "github:NixOS/nixpkgs/staging-next";
inputs.import-cargo.url = github:edolstra/import-cargo;
outputs = { self, nixpkgs, import-cargo }:
let
# System types to support.
supportedSystems = [ "x86_64-linux" ];
# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
forAllSystems = f: nixpkgs.lib.genAttrs supportedSystems (system: f system);
# Nixpkgs instantiated for supported system types.
nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; overlays = [ self.overlay ]; });
in {
# A Nixpkgs overlay.
overlay = final: prev: {
piomux = with final; final.callPackage ({ inShell ? false }: stdenv.mkDerivation rec {
pname = "piomux";
version = "0.1.0";
# In 'nix develop', we don't need a copy of the source tree
# in the Nix store.
src = if inShell then null else ./.;
buildInputs =
[ rustc
cargo
] ++ (if inShell then [
# In 'nix develop', provide some developer tools.
rustfmt
clippy
] else [
(import-cargo.builders.importCargo {
lockFile = ./Cargo.lock;
inherit pkgs;
}).cargoHome
]);
target = "--release";
buildPhase = "cargo build ${target} --frozen --offline";
doCheck = true;
checkPhase = "cargo test ${target} --frozen --offline";
installPhase =
''
mkdir -p $out
cargo install --frozen --offline --path . --root $out
rm $out/.crates.toml
'';
}) {};
};
# Provide some binary packages for selected system types.
packages = forAllSystems (system:
{
inherit (nixpkgsFor.${system}) piomux;
});
# The default package for 'nix build'. This makes sense if the
# flake provides only one package or there is a clear "main"
# package.
defaultPackage = forAllSystems (system: self.packages.${system}.piomux);
# Provide a 'nix develop' environment for interactive hacking.
devShell = forAllSystems (system: self.packages.${system}.piomux.override { inShell = true; });
# Tests run by 'nix flake check' and by Hydra.
checks = forAllSystems
(system:
with nixpkgsFor.${system};
{
inherit (self.packages.${system}) piomux;
}
);
};
}