1 files changed, 12 insertions, 4 deletions

diff --git a/src/libexpr/primops/fetchTree.cc b/src/libexpr/primops/fetchTree.cc
index c5a0d9886..f9dfb1164 100644
--- a/src/libexpr/primops/fetchTree.cc
+++ b/src/libexpr/primops/fetchTree.cc
@@ -3,6 +3,7 @@
 #include "store-api.hh"
 #include "fetchers.hh"
 #include "filetransfer.hh"
+#include "registry.hh"
 
 #include <ctime>
 #include <iomanip>
@@ -33,9 +34,11 @@ void emitTreeAttrs(
     if (tree.info.revCount)
         mkInt(*state.allocAttr(v, state.symbols.create("revCount")), *tree.info.revCount);
 
-    if (tree.info.lastModified)
-        mkString(*state.allocAttr(v, state.symbols.create("lastModified")),
+    if (tree.info.lastModified) {
+        mkInt(*state.allocAttr(v, state.symbols.create("lastModified")), *tree.info.lastModified);
+        mkString(*state.allocAttr(v, state.symbols.create("lastModifiedDate")),
             fmt("%s", std::put_time(std::gmtime(&*tree.info.lastModified), "%Y%m%d%H%M%S")));
+    }
 
     v.attrs->sort();
 }
@@ -60,8 +63,10 @@ static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, V
                 attrs.emplace(attr.name, attr.value->string.s);
             else if (attr.value->type == tBool)
                 attrs.emplace(attr.name, attr.value->boolean);
+            else if (attr.value->type == tInt)
+                attrs.emplace(attr.name, attr.value->integer);
             else
-                throw TypeError("fetchTree argument '%s' is %s while a string or Boolean is expected",
+                throw TypeError("fetchTree argument '%s' is %s while a string, Boolean or integer is expected",
                     attr.name, showType(*attr.value));
         }
 
@@ -72,8 +77,11 @@ static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, V
     } else
         input = fetchers::inputFromURL(state.coerceToString(pos, *args[0], context, false, false));
 
+    if (!evalSettings.pureEval && !input->isDirect())
+        input = lookupInRegistries(state.store, input).first;
+
     if (evalSettings.pureEval && !input->isImmutable())
-        throw Error("in pure evaluation mode, 'fetchTree' requires an immutable input");
+        throw Error("in pure evaluation mode, 'fetchTree' requires an immutable input, at %s", pos);
 
     // FIXME: use fetchOrSubstituteTree
     auto [tree, input2] = input->fetchTree(state.store);