Merge pull request #9738 from shlevy/ifd-buildStore-2.18

(Backport #9661) Build IFD in the build store when using eval-store.

src/libexpr/primops.cc

@@ -82,16 +82,15 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
     /* Build/substitute the context. */
     std::vector<DerivedPath> buildReqs;
     for (auto & d : drvs) buildReqs.emplace_back(DerivedPath { d });
-    store->buildPaths(buildReqs);
+    buildStore->buildPaths(buildReqs, bmNormal, store);
+
+    StorePathSet outputsToCopyAndAllow;
 
     for (auto & drv : drvs) {
-        auto outputs = resolveDerivedPath(*store, drv);
+        auto outputs = resolveDerivedPath(*buildStore, drv, &*store);
         for (auto & [outputName, outputPath] : outputs) {
-            /* Add the output of this derivations to the allowed
-               paths. */
-            if (allowedPaths) {
-                allowPath(outputPath);
-            }
+            outputsToCopyAndAllow.insert(outputPath);
+
             /* Get all the output paths corresponding to the placeholders we had */
             if (experimentalFeatureSettings.isEnabled(Xp::CaDerivations)) {
                 res.insert_or_assign(
@@ -100,12 +99,21 @@ StringMap EvalState::realiseContext(const NixStringContext & context)
                             .drvPath = drv.drvPath,
                             .output = outputName,
                         }).render(),
-                    store->printStorePath(outputPath)
+                    buildStore->printStorePath(outputPath)
                 );
             }
         }
     }
 
+    if (store != buildStore) copyClosure(*buildStore, *store, outputsToCopyAndAllow);
+    if (allowedPaths) {
+        for (auto & outputPath : outputsToCopyAndAllow) {
+            /* Add the output of this derivations to the allowed
+               paths. */
+            allowPath(store->toRealPath(outputPath));
+        }
+    }
+
     return res;
 }
 

tests/functional/eval-store.sh

@@ -28,3 +28,11 @@ nix-build dependencies.nix --eval-store "$eval_store" -o "$TEST_ROOT/result"
 [[ -e $TEST_ROOT/result/foobar ]]
 (! ls $NIX_STORE_DIR/*.drv)
 ls $eval_store/nix/store/*.drv
+
+clearStore
+rm -rf "$eval_store"
+
+# Confirm that import-from-derivation builds on the build store
+[[ $(nix eval --eval-store "$eval_store?require-sigs=false" --impure --raw --file ./ifd.nix) = hi ]]
+ls $NIX_STORE_DIR/*dependencies-top/foobar
+(! ls $eval_store/nix/store/*dependencies-top/foobar)

tests/functional/ifd.nix

@@ -0,0 +1,10 @@
+with import ./config.nix;
+import (
+  mkDerivation {
+    name = "foo";
+    bla = import ./dependencies.nix {};
+    buildCommand = "
+      echo \\\"hi\\\" > $out
+    ";
+  }
+)

tests/functional/remote-store.sh

@@ -19,18 +19,7 @@ else
 fi
 
 # Test import-from-derivation through the daemon.
-[[ $(nix eval --impure --raw --expr '
-  with import ./config.nix;
-  import (
-    mkDerivation {
-      name = "foo";
-      bla = import ./dependencies.nix {};
-      buildCommand = "
-        echo \\\"hi\\\" > $out
-      ";
-    }
-  )
-') = hi ]]
+[[ $(nix eval --impure --raw --file ./ifd.nix) = hi ]]
 
 storeCleared=1 NIX_REMOTE_=$NIX_REMOTE $SHELL ./user-envs.sh