49 lines
1.2 KiB
Nix
49 lines
1.2 KiB
Nix
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{
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# Exposes an overlay that adds one package, then imports nixpkgs with that
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# overlay so the package is available through normal flake outputs.
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description = "A minimal overlay example";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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};
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outputs =
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{ self, nixpkgs, ... }:
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let
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system = "x86_64-linux";
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overlay = _: prev: {
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hello-overlay = prev.writeShellScriptBin "hello-overlay" ''
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echo "hello from an overlay"
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'';
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};
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pkgs = import nixpkgs {
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inherit system;
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overlays = [ overlay ];
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};
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in
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{
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overlays.default = overlay;
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packages.${system}.default = pkgs.hello-overlay;
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apps.${system}.default = {
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type = "app";
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program = "${self.packages.${system}.default}/bin/hello-overlay";
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meta.description = "Run the package added by the overlay.";
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};
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checks.${system}.runs = pkgs.runCommand "hello-overlay-runs" { } ''
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output="$(${self.packages.${system}.default}/bin/hello-overlay)"
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if [ "$output" = "hello from an overlay" ]; then
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echo ok > "$out"
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else
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echo "unexpected output: $output" >&2
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exit 1
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fi
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'';
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};
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}
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