1 files changed, 12 insertions, 1 deletions
diff --git a/tvix/glue/src/builtins/mod.rs b/tvix/glue/src/builtins/mod.rs
index 4081489e0e..3d6263286d 100644
--- a/tvix/glue/src/builtins/mod.rs
+++ b/tvix/glue/src/builtins/mod.rs
@@ -68,7 +68,7 @@ mod tests {
     fn eval(str: &str) -> EvaluationResult {
         // We assemble a complete store in memory.
         let runtime = tokio::runtime::Runtime::new().expect("Failed to build a Tokio runtime");
-        let (blob_service, directory_service, path_info_service) = runtime
+        let (blob_service, directory_service, path_info_service, nar_calculation_service) = runtime
             .block_on(async { construct_services("memory://", "memory://", "memory://").await })
             .expect("Failed to construct store services in memory");
 
@@ -76,6 +76,7 @@ mod tests {
             blob_service,
             directory_service,
             path_info_service.into(),
+            nar_calculation_service.into(),
             Arc::<DummyBuildService>::default(),
             runtime.handle().clone(),
         ));
@@ -739,6 +740,7 @@ mod tests {
         false
     )]
     fn builtins_filter_source_unsupported_files(#[case] code: &str, #[case] exp_success: bool) {
+        use nix::errno::Errno;
         use nix::sys::stat;
         use nix::unistd;
         use std::os::unix::net::UnixListener;
@@ -765,6 +767,15 @@ mod tests {
             stat::Mode::S_IRWXU,
             0,
         )
+        .inspect_err(|e| {
+            if *e == Errno::EPERM {
+                eprintln!(
+                    "\
+Missing permissions to create a character device node with mknod(2).
+Please run this test as root or set CAP_MKNOD."
+                );
+            }
+        })
         .expect("Failed to create a character device node");
 
         let code_replaced = code.replace("@fixtures", &temp.path().to_string_lossy());