fix(core): error when restoring http cache with no outputs (#30961)

packages/nx/src/native/cache/cache.rs

@@ -301,9 +301,26 @@ impl NxCache {
             &outputs_path,
             &self.workspace_root
         );
-        let sz = _copy(outputs_path, &self.workspace_root)?;
+        let sz = _copy(outputs_path, &self.workspace_root);
 
-        Ok(sz)
+        match sz {
+            Err(e) => {
+                let kind = underlying_io_error_kind(&e);
+                match kind {
+                    Some(std::io::ErrorKind::NotFound) => {
+                        trace!("No artifacts to copy: {:?}", e);
+                        Ok(0)
+                    }
+                    _ => {
+                        return Err(anyhow::anyhow!("Error copying files from cache: {:?}", e));
+                    }
+                }
+            }
+            Ok(sz) => {
+                trace!("Copied {} bytes from cache", sz);
+                Ok(sz)
+            }
+        }
     }
 
     #[napi]
@@ -407,3 +424,13 @@ where
         }
     }
 }
+
+// From: https://docs.rs/anyhow/latest/anyhow/struct.Error.html#example-1
+fn underlying_io_error_kind(error: &anyhow::Error) -> Option<std::io::ErrorKind> {
+    for cause in error.chain() {
+        if let Some(io_error) = cause.downcast_ref::<std::io::Error>() {
+            return Some(io_error.kind());
+        }
+    }
+    None
+}