Trait HashDerivationModuloLookup 

pub trait HashDerivationModuloLookup {
    // Required method
    fn lookup_hdm(&self, drv_path: &StorePathRef<'_>) -> Option<Sha256>;
}

Lookup hash derivation modulo for a derivation.

The [hash derivation modulo] is recursive. And so to calculate the HDM of a derivation it requires the HDM for all its input derviations.

This trait exists to provide the HDM values for those input derivations to the functions that calculate the HDM.

To help with implemeting this trait lookup_fn is provided.

Required Methods

fn lookup_hdm(&self, drv_path: &StorePathRef<'_>) -> Option<Sha256>

Lookup the [hash derivation modulo] of the provided derivation store path.

Implementations on Foreign Types

impl HashDerivationModuloLookup for HashMap<StorePath, Sha256>

Available on crate feature hashbrown only.

fn lookup_hdm(&self, drv_path: &StorePathRef<'_>) -> Option<Sha256>

Implementors

impl<F> HashDerivationModuloLookup for LookupFn<F>

where F: Fn(&StorePathRef<'_>) -> Option<Sha256>,