1 files changed, 11 insertions, 1 deletions
diff --git a/tvix/castore/src/blobservice/combinator.rs b/tvix/castore/src/blobservice/combinator.rs
index 0bce657e9176..8ec5a859bcda 100644
--- a/tvix/castore/src/blobservice/combinator.rs
+++ b/tvix/castore/src/blobservice/combinator.rs
@@ -6,7 +6,7 @@ use tonic::async_trait;
 use tracing::{instrument, warn};
 
 use crate::composition::{CompositionContext, ServiceBuilder};
-use crate::B3Digest;
+use crate::{B3Digest, Error};
 
 use super::{naive_seeker::NaiveSeeker, BlobReader, BlobService, BlobWriter};
 
@@ -103,6 +103,16 @@ pub struct CombinedBlobServiceConfig {
     remote: String,
 }
 
+impl TryFrom<url::Url> for CombinedBlobServiceConfig {
+    type Error = Box<dyn std::error::Error + Send + Sync>;
+    fn try_from(_url: url::Url) -> Result<Self, Self::Error> {
+        Err(Error::StorageError(
+            "Instantiating a CombinedBlobService from a url is not supported".into(),
+        )
+        .into())
+    }
+}
+
 #[async_trait]
 impl ServiceBuilder for CombinedBlobServiceConfig {
     type Output = dyn BlobService;