lpkg/ai/notes.md

Integrating jhalfs Source Metadata

• Goal: reuse jhalfs wget-list and md5sums to populate package source.urls and auto-fill checksums when harvesting metadata for MLFS/BLFS/GLFS packages.
• Data source: https://anduin.linuxfromscratch.org/ hosts per-release wget-list/md5sums files already curated by the jhalfs project.
• Approach:
  1. Fetch (and optionally cache under ai/cache/) the lists for each book.
  2. When harvesting, map <package>-<version> against the list to gather all relevant URLs.
  3. Pull matching checksum entries to populate source.checksums.
  4. Keep the existing HTML scrape for chapter/stage text; jhalfs covers only sources.
• Benefits: avoids fragile HTML tables, keeps URLs aligned with official build scripts, and ensures checksums are up-to-date.

Metadata → Rust Module Strategy

Goal: emit Rust modules under src/pkgs/by_name directly from harvested metadata once MLFS/BLFS/GLFS records are validated.

Outline:

1. Schema alignment – Ensure harvested JSON carries everything the PackageDefinition constructor expects (source URLs, checksums, build commands, dependencies, optimisation flags, notes/stage metadata).
2. Translation layer – Implement a converter (likely in a new module, e.g. src/pkgs/generator.rs) that reads a metadata JSON file and produces a ScaffoldRequest or directly writes the module source via the existing scaffolder.
3. Naming/layout – Derive module paths from package.id (e.g. mlfs/binutils-pass-1 → src/pkgs/by_name/bi/binutils/pass_1/mod.rs) while preserving the prefix/slug conventions already used by the scaffolder.
4. CLI integration – Add a subcommand (metadata_indexer generate) that accepts a list of package IDs or a glob, feeds each through the translator, and optionally stages the resulting Rust files.
5. Diff safety – Emit modules to a temporary location first, compare against existing files, and only overwrite when changes are detected; keep a --dry-run mode for review.
6. Tests/checks – After generation, run cargo fmt and cargo check to ensure the new modules compile; optionally add schema fixtures covering edge cases (variants, multiple URLs, absent checksums).

Open questions:

• How to represent optional post-install steps or multi-phase builds inside the generated module (additional helper functions vs. raw command arrays).
• Where to store PGO workload hints once the PGO infrastructure is defined.