Project Overview & Terminology

If you want to hack on this, it is useful to know that build file generation is broken up into multiple phases:

1. cargo metadata: Calling cargo metadata via the cargo_metadata crate.
2. indexing metadata: Indexing the metadata by package ID to enable easy joining of “Node” and “Package” information, resulting in metadata::IndexedMetadata.
3. resolving: Using the indexed metadata to actually resolve the dependencies and join all needed build information into resolve::CrateDerivation.
4. pre-fetching: Pre-fetching crates.io packages to determine their sha256, see prefetch module.
5. rendering: Rendering the data via the build.nix.tera template, see render module.