* Switch to the calling user context for some more operations in a

setuid installation.

src/libstore/gc.cc

@@ -87,8 +87,11 @@ Path addPermRoot(const Path & _storePath, const Path & _gcRoot,
         string hash = printHash32(hashString(htSHA1, gcRoot));
         Path realRoot = canonPath((format("%1%/%2%/auto/%3%")
             % nixStateDir % gcRootsDir % hash).str());
-
-        createSymlink(gcRoot, storePath, true);
+        
+        {
+            SwitchToOriginalUser sw;
+            createSymlink(gcRoot, storePath, true);
+        }
         createSymlink(realRoot, gcRoot, false);
     }
 

src/nix-store/main.cc

@@ -25,6 +25,7 @@ static bool indirectRoot = false;
 
 static Path fixPath(Path path)
 {
+    SwitchToOriginalUser sw;
     path = absPath(path);
     while (!isInStore(path)) {
         if (!isLink(path)) break;