46 lines
1.3 KiB
Nix
46 lines
1.3 KiB
Nix
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{
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# Customizes an existing package with `overrideAttrs` and verifies that
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# the override changes the package's runtime behavior.
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description = "Customize an existing package with overrideAttrs";
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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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pkgs = import nixpkgs { inherit system; };
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customizedHello = pkgs.hello.overrideAttrs (old: {
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pname = "hello-override";
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nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [ pkgs.makeWrapper ];
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postInstall = (old.postInstall or "") + ''
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wrapProgram $out/bin/hello \
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--add-flags "--greeting=hello-from-overrideAttrs"
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'';
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});
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in
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{
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packages.${system}.default = customizedHello;
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apps.${system}.default = {
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type = "app";
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program = "${self.packages.${system}.default}/bin/hello";
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meta.description = "Run GNU hello with a greeting injected by overrideAttrs.";
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};
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checks.${system}.greeting = pkgs.runCommand "hello-override-check" { } ''
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output="$(${self.packages.${system}.default}/bin/hello)"
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if [ "$output" = "hello-from-overrideAttrs" ]; 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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