Add test for verifying overlay store.

tests/overlay-local-store/local.mk

@@ -3,6 +3,7 @@ overlay-local-store-tests := \
   $(d)/redundant-add.sh \
   $(d)/build.sh \
   $(d)/bad-uris.sh \
-  $(d)/add-lower.sh
+  $(d)/add-lower.sh \
+  $(d)/verify.sh
 
 install-tests-groups += overlay-local-store

tests/overlay-local-store/verify-inner.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+set -eu -o pipefail
+
+set -x
+
+source common.sh
+
+# Avoid store dir being inside sandbox build-dir
+unset NIX_STORE_DIR
+unset NIX_STATE_DIR
+
+storeDirs
+
+initLowerStore
+
+mountOverlayfs
+
+#path=$(nix-store --store "$storeB" --add ../dummy)
+
+path=$(nix-build --store $storeB ../hermetic.nix --arg busybox "$busybox" --arg seed 1)
+
+inputDrvPath=$(find "$storeA" -name "*-hermetic-input-1.drv")
+rm -v "$inputDrvPath"
+
+#tree "$TEST_ROOT"
+
+#rm -v "$TEST_ROOT/store-a/$path"
+
+nix-store --store "$storeB" --verify
+
+echo "SUCCESS"

tests/overlay-local-store/verify.sh

@@ -0,0 +1,5 @@
+source common.sh
+
+requireEnvironment
+setupConfig
+execUnshare ./verify-inner.sh