nix-super/tests/local-overlay-store/build-inner.sh

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#!/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
### Do a build in overlay store
path=$(nix-build ../hermetic.nix --arg busybox $busybox --arg seed 2 --store "$storeB" --no-out-link)
# Checking for path in lower layer (should fail)
expect 1 stat $(toRealPath "$storeA/nix/store" "$path")
# Checking for path in upper layer
stat $(toRealPath "$storeBTop" "$path")
# Verifying path in overlay store
nix-store --verify-path --store "$storeB" "$path"