Artifact [ca030d5a2b]

Artifact ca030d5a2bb92d743f97d4d48dfa8ff666692e05e73d6ff181fccf0dfee5fc45:

• File internal/content/export_test.go — part of check-in [b28c06506b] at 2026-10-22 02:57:50 on branch feat/horizon-cones — fix(content): classify sparse stores from crosslink tables, not the whole store

  Sparse classification read, inflated and delta-expanded every held blob, file content included, under a whole-store byte budget. On a clone of the Fossil SCM repository (67,894 blobs, 8.4 GB expanded) LoadAbsences failed at once with "byte budget exceeded", so no path-cone or content-horizon store of a real repository could classify its phantoms, and pull, verify and compaction failed with it.

  Reference facts now come from the tables wherever they provably stand in for raw cards. A blob the crosslinker recorded as no artifact and mlink names as a file version is never read. A completely linked check-in (event row, no orphan row, a primary parent edge) whose primary parent and baseline trees are themselves reproduced contributes its mlink rows as F cards and its plink, cherrypick and tagxref rows as references; by induction over the primary chain those rows give the same (name, file) pairs as its raw cards. Everything else is still read raw: unlinked and orphaned check-ins, roots, check-ins whose parent never arrived, other artifacts, and every check-in once the store has seen a sub-manifest, since trees are not crosslinked. Budgets are charged per round for the selected blobs and their delta ancestors only, and a base's bytes are released once its last delta is applied.

  A content horizon now reads only its held set's manifests and the baselines and nodes they reach, on demand, with one visited set and a byte budget scaled to the held set.

  On the Fossil SCM clone, cone {src} classifies in about 2 s at a 65 MiB peak heap, reading 8,655 of 67,894 blobs; the inside/outside sets equal the all-raw result, and Outside/Required agree on every artifact. (user: [email protected], size: 1080) [annotate] [blame] [check-ins using] [more...]

package content

import (
	"context"

	"github.com/danmestas/go-libfossil/db"
)

// LoadAbsencesWithin is LoadAbsencesContext under injected budgets, and
// reports what classification read. The tests that use it are an external
// package: their fixtures need the manifest writer, which imports this one.
func LoadAbsencesWithin(
	ctx context.Context, q db.Querier, refs ReferenceBudget, treePerCheckin int64,
) (*Absences, ReferenceWork, error) {
	treeMax := treePerCheckin << 10
	if treeMax > defaultReferenceLimits.treeMax {
		treeMax = defaultReferenceLimits.treeMax
	}
	a, err := loadAbsences(ctx, q, referenceLimits{
		refs: refs, treePerCheckin: treePerCheckin, treeMax: treeMax,
	})
	if a == nil {
		return nil, ReferenceWork{}, err
	}
	return a, a.work, err
}

// LoadAbsencesWork is LoadAbsencesContext, reporting what classification
// read under the default budgets.
func LoadAbsencesWork(ctx context.Context, q db.Querier) (*Absences, ReferenceWork, error) {
	limits := defaultReferenceLimits
	return LoadAbsencesWithin(ctx, q, limits.refs, limits.treePerCheckin)
}