* In the garbage collector, if deleting a path fails, try to fix its

ownership, then try again.

src/libstore/local-store.cc

@@ -710,7 +710,18 @@ void deleteFromStore(const Path & _path, unsigned long long & bytesFreed)
     }
     txn.commit();
 
-    deletePath(path, bytesFreed);
+    try {
+        /* First try to delete it ourselves. */
+        deletePath(path, bytesFreed);
+    } catch (SysError & e) {
+        /* If this failed due to a permission error, then try it with
+           the setuid helper. */
+        if (haveBuildUsers() && !amPrivileged()) {
+            getOwnership(path);
+            deletePath(path, bytesFreed);
+        } else
+            throw;
+    }
 }