Split tests some more

Good for parallelism and easier reading.

tests/overlay-local-store/check-post-init-inner.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+
+set -eu -o pipefail
+
+set -x
+
+source common.sh
+
+storeDirs
+
+initLowerStore
+
+mountOverlayfs
+
+### Check status
+
+# Checking for path in lower layer
+stat $(toRealPath "$storeA/nix/store" "$path")
+
+# Checking for path in upper layer (should fail)
+expect 1 stat $(toRealPath "$storeBTop" "$path")
+
+# Checking for path in overlay store matching lower layer
+diff $(toRealPath "$storeA/nix/store" "$path") $(toRealPath "$TEST_ROOT/merged-store/nix/store" "$path")
+
+# Checking requisites query agreement
+[[ \
+  $(nix-store --store $storeA --query --requisites $drvPath) \
+  == \
+  $(nix-store --store $storeB --query --requisites $drvPath) \
+  ]]
+
+# Checking referrers query agreement
+busyboxStore=$(nix store --store $storeA add-path $busybox)
+[[ \
+  $(nix-store --store $storeA --query --referrers $busyboxStore) \
+  == \
+  $(nix-store --store $storeB --query --referrers $busyboxStore) \
+  ]]
+
+# Checking derivers query agreement
+[[ \
+  $(nix-store --store $storeA --query --deriver $path) \
+  == \
+  $(nix-store --store $storeB --query --deriver $path) \
+  ]]
+
+# Checking outputs query agreement
+[[ \
+  $(nix-store --store $storeA --query --outputs $drvPath) \
+  == \
+  $(nix-store --store $storeB --query --outputs $drvPath) \
+  ]]
+
+# Verifying path in lower layer
+nix-store --verify-path --store "$storeA" "$path"
+
+# Verifying path in merged-store
+nix-store --verify-path --store "$storeB" "$path"
+
+hashPart=$(echo $path | sed "s^$NIX_STORE_DIR/^^" | sed 's/-.*//')
+
+# Lower store can find from hash part
+[[ $(nix store --store $storeA path-from-hash-part $hashPart) == $path ]]
+
+# merged store can find from hash part
+[[ $(nix store --store $storeB path-from-hash-part $hashPart) == $path ]]