Choosing enabled features

The enabled features for a crate now are resolved at build time! That means you can easily override them:

1. There is a “rootFeatures” argument to the generated build file which you can override when calling it from the command line:

   nix build -f ....nix --arg rootFeatures '["default" "other"]' rootCrate.build

2. Or when importing the build file with “callPackage”:

   let cargo_nix = callPackage ./Cargo.nix { rootFeatures = ["default" "other"]; };
       crate2nix = cargo_nix.rootCrate.build;
   in ...

3. Or by overriding them on the rootCrate or workspaceMembers:

   let cargo_nix = callPackage ./Cargo.nix {};
       crate2nix = cargo_nix.rootCrate.build.override { features = ["default" "other"]; };
   in ...

Note that only dependencies for the default features are included in the build. If you want full flexibility, you can use crate2nix generate --all-features to generate the most general build file. If you want to strip down the generated build file, you may want to use crate2nix generate --no-default-features --features "feature1 feature2".