1 files changed, 29 insertions, 0 deletions
diff --git a/object/store/packed/trailer_match.go b/object/store/packed/trailer_match.go
new file mode 100644
index 00000000..dc43e37d
--- /dev/null
+++ b/object/store/packed/trailer_match.go
@@ -0,0 +1,29 @@
+package packed
+
+import "fmt"
+
+// verifyPackMatchesIndexes checks that one opened pack's trailer hash matches
+// every loaded index that references the same pack name.
+func (store *Store) verifyPackMatchesIndexes(pack *packFile) error {
+	snapshot, err := store.ensureCandidates()
+	if err != nil {
+		return err
+	}
+
+	candidate, ok := snapshot.candidateByPack[pack.name]
+	if !ok {
+		return fmt.Errorf("objectstore/packed: missing index for pack %q", pack.name)
+	}
+
+	index, err := store.openIndex(candidate)
+	if err != nil {
+		return err
+	}
+
+	err = verifyMappedPackMatchesMappedIdx(pack.data, index.data, store.algo)
+	if err != nil {
+		return fmt.Errorf("objectstore/packed: pack %q does not match idx %q: %w", pack.name, index.idxName, err)
+	}
+
+	return nil
+}