Struct EvalStateBuilder 

pub struct EvalStateBuilder { /* private fields */ }

Builder for Nix evaluation state.

This allows configuring the evaluation environment before creating the evaluation state.

Implementations

impl EvalStateBuilder

pub fn new(store: &Arc<Store>) -> Result<Self>

Create a new evaluation state builder.

Arguments

• store - The Nix store to use for evaluation

Errors

Returns an error if the builder cannot be created.

pub fn set_lookup_path(self, paths: &[impl AsRef<str>]) -> Result<Self>

Set the lookup path (NIX_PATH) for <...> expressions.

Each entry should be in the form "name=path" or just "path", matching the format of NIX_PATH entries.

Errors

Returns an error if the lookup path cannot be set.

pub fn with_flake_settings(self, settings: &FlakeSettings) -> Result<Self>

Apply flake settings to the evaluation state builder.

This enables builtins.getFlake and related flake functionality in the resulting EvalState.

Errors

Returns an error if the flake settings cannot be applied.

pub fn no_load_config(self) -> Self

Skip loading Nix configuration from the environment.

By default build calls nix_eval_state_builder_load to read configuration from environment variables and config files. Call this method to skip that step, which is useful in tests or sandboxed environments.

pub fn build(self) -> Result<EvalState>

Build the evaluation state.

Errors

Returns an error if the evaluation state cannot be built.

Trait Implementations

impl Drop for EvalStateBuilder

fn drop(&mut self)

Executes the destructor for this type.