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lpkg/docs/METADATA_PIPELINE.md

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Metadata Harvesting Pipeline

This repository tracks AI-friendly package metadata under ai/metadata/. The metadata_indexer binary orchestrates validation and harvesting tasks. This document explains the workflow and the supporting assets.

Directory layout

  • ai/metadata/schema.json – JSON Schema (Draft 2020-12) describing one package record.
  • ai/metadata/packages/<book>/<slug>.json – harvested package metadata.
  • ai/metadata/index.json – generated summary table linking package IDs to their JSON files.
  • ai/notes.md – scratchpad for future improvements (e.g., jhalfs integration).

metadata_indexer commands

Command Description
validate Loads every package JSON file and validates it against schema.json. Reports schema violations and summary extraction errors.
index Re-runs validation and regenerates index.json. Use --compact to write a single-line JSON payload.
harvest Fetches a book page, scrapes build instructions, and emits a draft metadata record (to stdout with --dry-run or into ai/metadata/packages/).

Harvesting flow

  1. Fetch HTML – the requested page is downloaded with reqwest and parsed using scraper selectors.
  2. Heading metadata – the h1.sect1 title provides the chapter/section, canonical package name, version, and optional variant hints.
  3. Build steps – <pre class="userinput"> blocks become ordered build phases (setup, configure, build, test, install).
  4. Artifact stats – div.segmentedlist entries supply SBU and disk usage.
  5. Source URLs – the harvester tries two strategies:
    • Inline HTML links inside the page (common for BLFS articles).
    • Fallback to the jhalfs wget-list for the selected book (currently MLFS) using package-management::wget_list::get_wget_list to find matching <package>-<version> entries.
  6. Checksums – integration with the book’s md5sums mirror is pending; placeholder wiring exists (src/md5_utils.rs).
  7. Status – unresolved items (missing URLs, anchors, etc.) are recorded in status.issues so humans can interrogate or patch the draft before promoting it.

Known gaps

  • Source links via tables – some MLFS chapters list download links inside a “Package Information” table. The current implementation relies on the jhalfs wget-list fallback instead of parsing that table.
  • Checksums – MD5 lookups from jhalfs are planned but not yet wired into the harvest pipeline.
  • Anchor discovery – if the heading lacks an explicit id attribute, the scraper attempts to locate child anchors or scan the raw HTML. If none are found, a warning is recorded and status.issues contains a reminder.

Using jhalfs manifests

The maintained wget-list/md5sums files hosted by jhalfs provide canonical source URLs and hashes. The helper modules src/wget_list.rs and src/md5_utils.rs download these lists for the multilib LFS book. The harvester currently consumes the wget-list as a fallback; integrating the md5sums file will let us emit source.checksums automatically.

Planned enhancements (see ai/notes.md and ai/bugs.json#metadata-harvest-no-source-urls):

  1. Abstract list fetching so BLFS/GLFS variants can reuse the logic.
  2. Normalise the match criteria for package + version (handling pass stages, suffixes, etc.).
  3. Populate checksum entries alongside URLs.

Manual review checklist

When a new metadata file is generated:

  • schema_version should match schema.json (currently v0.1.0).
  • package.id should be unique (format <book>/<slug>).
  • source.urls must include at least one primary URL; add mirrors/patches as needed.
  • Clear any status.issues before promoting the record from draft.
  • Run cargo run --bin metadata_indexer -- --base-dir . index to regenerate the global index once the draft is finalised.

Refer to README.md for usage examples and to docs/ARCHITECTURE.md for a broader overview of the crate layout.