attempt to fix car validation

pkg/hold/pds/xrpc.go

@@ -7,6 +7,8 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/bluesky-social/indigo/repo"
+	"github.com/bluesky-social/indigo/util"
 	"github.com/ipfs/go-cid"
 	"github.com/ipld/go-car"
 	carutil "github.com/ipld/go-car/util"
@@ -273,21 +275,50 @@ func (h *XRPCHandler) HandleSyncGetRecord(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	// Get the record CID and raw bytes
-	recordCID, _, err := h.pds.GetCrewMember(r.Context(), rkey)
+	// Get the current repo head
+	repoHead, err := h.pds.carstore.GetUserRepoHead(r.Context(), h.pds.uid)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("failed to get repo head: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	// Create a new delta session with logging blockstore
+	tempSession, err := h.pds.carstore.NewDeltaSession(r.Context(), h.pds.uid, nil)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("failed to create temp session: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	// Wrap the session's blockstore with a logging blockstore
+	loggingBS := util.NewLoggingBstore(tempSession)
+
+	// Open the repo with the logging blockstore
+	tempRepo, err := repo.OpenRepo(r.Context(), loggingBS, repoHead)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("failed to open repo: %v", err), http.StatusInternalServerError)
+		return
+	}
+
+	// Get the record path
+	path := fmt.Sprintf("%s/%s", collection, rkey)
+
+	// Get the record (this will log all accessed blocks in the MST path)
+	recordCID, _, err := tempRepo.GetRecordBytes(r.Context(), path)
 	if err != nil {
 		http.Error(w, fmt.Sprintf("failed to get record: %v", err), http.StatusNotFound)
 		return
 	}
 
-	// Get the raw block from the blockstore
-	blk, err := h.pds.repo.Blockstore().Get(r.Context(), recordCID)
-	if err != nil {
-		http.Error(w, fmt.Sprintf("failed to get record block: %v", err), http.StatusInternalServerError)
-		return
+	// Get all blocks that were accessed during record retrieval
+	blocks := loggingBS.GetLoggedBlocks()
+
+	// Log block count for debugging
+	fmt.Printf("sync.getRecord: Retrieved %d blocks for record at %s/%s\n", len(blocks), collection, rkey)
+	for i, blk := range blocks {
+		fmt.Printf("  Block %d: CID=%s, size=%d bytes\n", i+1, blk.Cid().String(), len(blk.RawData()))
 	}
 
-	// Write CAR file with the single record
+	// Write CAR file with all accessed blocks
 	w.Header().Set("Content-Type", "application/vnd.ipld.car")
 
 	// Create a buffer to write the CAR data
@@ -305,10 +336,12 @@ func (h *XRPCHandler) HandleSyncGetRecord(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	// Write the block using LdWrite
-	if err := carutil.LdWrite(&buf, recordCID.Bytes(), blk.RawData()); err != nil {
-		http.Error(w, fmt.Sprintf("failed to write block to CAR: %v", err), http.StatusInternalServerError)
-		return
+	// Write all logged blocks to the CAR file
+	for _, blk := range blocks {
+		if err := carutil.LdWrite(&buf, blk.Cid().Bytes(), blk.RawData()); err != nil {
+			http.Error(w, fmt.Sprintf("failed to write block to CAR: %v", err), http.StatusInternalServerError)
+			return
+		}
 	}
 
 	// Write the CAR data to the response