Elamur Groupantsmathlib-fetch-manifest
The groupant beside tools/mathlib/src/fetch.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | ../syntax.json |
| cost | partial | invariant-and-cost |
| descriptant | present | descriptant |
| invariant | partial | invariant-and-cost |
| tests | bounded checks | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
license_union | license_union | partial source derived model | license_union |
format_nondeterminism | format_nondeterminism | partial source derived model | format_nondeterminism |
paired_outputs | paired_outputs | partial source derived model | paired_outputs |
item_index_coupling | item_index_coupling | partial source derived model | item_index_coupling |
Model text
descriptant
mathlib-fetch-manifest
Partition Done by items[item_idx].slug in a BTreeMap; serialize sorted slug groups to JSONL, then serialize Done in original order to TSV.
Epoch 2026-10-31
Prospective model retained before changes. Existing production bytes are preserved; additions are bounded inline tests. Nine source groupants expose ingestion and routing boundaries; typed children bind exact source bytes and reuse their parent syntax projection. Native tests run twice per profile; behavior mutants run as compiled source changes and exact bytes are restored before positive checks.
Important retained observation: network-looking helpers are not all pure (DNS inside github_host and books build); selection deliberately excludes those effects. Mixed-format manifest order is not deterministic, and error paths do not imply rollback.
No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.
approximant
Forward relation
Partition Done by items[item_idx].slug in a BTreeMap; serialize sorted slug groups to JSONL, then serialize Done in original order to TSV.
Model observations include returns, retained state and ordered partial effects; on external failures the successful-prefix relation replaces a total-function claim.
catalog
behavior_complement
Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.
Multiple distinct licenses cannot yield the single-license group's license URL; it is empty. Empty Done writes zero JSONL rows and only TSV header, assuming successful writes.
Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.
Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.
reverse_reconstruction
Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.
A JSONL group determines a fiber of Done orderings across different slugs and original Item arrays; repeated item_idx and unused Items are not recoverable. TSV preserves Done row order but omits orig metadata.
Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.
Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.
license_union
Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.
For group license set L, |L|=1 selects first license and status; otherwise label='per file: '+sort(L), status=open. Domain contains valid Done indices.
Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.
Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.
format_nondeterminism
Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.
format joins distinct final extensions from HashSet; membership is determined, order is unspecified. Exact output comparison must not impose an order absent from the source.
Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.
Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.
paired_outputs
Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.
JSONL flush precedes TSV create. A TSV failure can coexist with completed JSONL; outputs are not atomically coupled. Source-derived effect model; no actual DB consumer test.
Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.
Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.
item_index_coupling
Every Done index selects both its grouping slug and all input metadata from the same Item. Changing a valid index can move a file between groups without changing bytes/hash; out-of-range index panics before serialization. The model requires valid indices and does not infer filesystem existence from manifest rows.
Subject and source identity: manifest.json. Domain: scoped forward/invariant; relation is source-derived and partial. Evidence: tests.md distinguishes actual checks from unexecuted effect paths; finite fixtures do not prove all inputs.
tests
Bounded evidence
Selected actual source checks:
- mathlib::fetch::tests::compacts_sources
- mathlib::fetch::tests::ext_and_licenses
- mathlib::fetch::wave33::list_signature_hash_and_existing
These checks are file-level evidence; fragment branches not reached by these names remain source-derived.
External wave33 mathlib receipt retains native-commands.json, numeric statuses, raw debug/release logs, sorted exact outcomes, mutation logs and original/restored hashes. Seventeen named checks pass twice per profile; six production behavior mutants reject in both profiles, with restored positives. Source syntax is regenerated twice after formatting and compared byte-for-byte. Structural validation tests bindings, not Rust semantics.
No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.
invariant-and-cost
Invariant and cost
Invariant
Per-group files keep Done order. A single license gives first item's license URL/status; multiple licenses sort code strings and clear group license URL.
Cost
O(D log S) grouping plus per-group license sorting O(L log L); whole serialized files in bounded writer buffers plus vectors.
Domain and gaps
No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/mathlib/src/fetch.rs.groupant/manifest.groupant/