Artifact [f0d07e359f]

Artifact f0d07e359f07e8007785f50cf47f39e19edb49917431e8ff56681c362237e325:

• File internal/sync/xdelete.go — part of check-in [f5744359d3] at 2026-04-19 16:30:54 on branch trunk — Initial open source release

  libfossil is a pure-Go implementation of the Fossil SCM, reading and writing the same .fossil SQLite repository format as upstream Fossil.

  This is the first public release of code that previously lived in a private repository. The module path is github.com/danmestas/libfossil and the binary is named libfossil to avoid $PATH collisions with upstream fossil.

  Included: - Repo lifecycle (create, clone), checkout/checkin, timeline, merge, diff, annotate, shun, tag, branch, bisect, stash, undo/redo - Sync-over-HTTP protocol (client and handler) - Two SQLite drivers: modernc (pure Go, default) and ncruces (wasm-capable) - Observer interfaces (SyncObserver, CheckoutObserver) with an optional OpenTelemetry implementation in observer/otel (separate submodule) - Deterministic simulation testing harness with BUGGIFY fault injection - Kong-based embeddable CLI under cli/ and a standalone binary under cmd/libfossil/ (user: [email protected], size: 1895) [annotate] [blame] [check-ins using]

package sync

import (
	"bytes"
	"encoding/json"
	"fmt"

	"github.com/danmestas/libfossil/db"
	"github.com/danmestas/libfossil/internal/repo"
)

// applyXDeleteLocally applies an xdelete to the local repo. Calls DeleteXRowByPKHash first;
// if the row doesn't exist, inserts a tombstone from pkData. Returns nil on success.
func applyXDeleteLocally(d *db.DB, table string, def repo.TableDef, pkHash string, mtime int64, pkData []byte) error {
	deleted, err := repo.DeleteXRowByPKHash(d, table, def, pkHash, mtime)
	if err != nil {
		return fmt.Errorf("applyXDeleteLocally: delete %s/%s: %w", table, pkHash, err)
	}
	if deleted {
		return nil
	}

	// Row didn't exist or had newer mtime. Check which case.
	existingRow, _, err := repo.LookupXRow(d, table, def, pkHash)
	if err != nil {
		return fmt.Errorf("applyXDeleteLocally: lookup %s/%s: %w", table, pkHash, err)
	}
	if existingRow != nil {
		return nil // Row exists with newer mtime — no-op.
	}

	// Row doesn't exist. Insert tombstone from PKData.
	if len(pkData) == 0 {
		return nil // No PKData — can't create tombstone.
	}
	dec := json.NewDecoder(bytes.NewReader(pkData))
	dec.UseNumber()
	var pkValues map[string]any
	if err := dec.Decode(&pkValues); err != nil {
		return fmt.Errorf("applyXDeleteLocally: decode PKData %s/%s: %w", table, pkHash, err)
	}
	coerceJSONNumbers(pkValues, def)

	// Verify PKData matches declared PKHash.
	var pkColDefs []repo.ColumnDef
	for _, col := range def.Columns {
		if col.PK {
			pkColDefs = append(pkColDefs, col)
		}
	}
	computedHash := repo.PKHash(pkColDefs, pkValues)
	if computedHash != pkHash {
		return fmt.Errorf("applyXDeleteLocally: PKData hash mismatch %s/%s: computed %s", table, pkHash, computedHash)
	}

	if err := repo.UpsertXRow(d, table, pkValues, mtime); err != nil {
		return fmt.Errorf("applyXDeleteLocally: insert tombstone %s/%s: %w", table, pkHash, err)
	}
	return nil
}