Add a test for the copy of CA paths

tests/local.mk

@@ -38,6 +38,7 @@ nix_tests = \
   describe-stores.sh \
   flakes.sh \
   content-addressed.sh \
+  nix-copy-content-addressed.sh \
   build.sh \
   compute-levels.sh
   # parallel.sh

tests/nix-copy-content-addressed.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+source common.sh
+
+# Globally enable the ca derivations experimental flag
+sed -i 's/experimental-features = .*/& ca-derivations ca-references/' "$NIX_CONF_DIR/nix.conf"
+
+export REMOTE_STORE_DIR="$TEST_ROOT/remote_store"
+export REMOTE_STORE="file://$REMOTE_STORE_DIR"
+
+ensureCorrectlyCopied () {
+    attrPath="$1"
+    nix build --store "$REMOTE_STORE" --file ./content-addressed.nix "$attrPath"
+}
+
+testOneCopy () {
+    clearStore
+    rm -rf "$REMOTE_STORE_DIR"
+
+    attrPath="$1"
+    nix copy --to $REMOTE_STORE "$attrPath" --file ./content-addressed.nix
+
+    ensureCorrectlyCopied "$attrPath"
+
+    # Ensure that we can copy back what we put in the store
+    clearStore
+    nix copy --from $REMOTE_STORE \
+        --file ./content-addressed.nix "$attrPath" \
+        --no-check-sigs
+}
+
+for attrPath in rootCA dependentCA transitivelyDependentCA dependentNonCA dependentFixedOutput; do
+    testOneCopy "$attrPath"
+done