feat(tvix/store): add redb PathInfoService

This provides a PathInfoService implementation using redb
(https://github.com/cberner/redb) as the underlying storage engine.

Both an in-memory variant, as well as a filesystem one is provided,
similar how it's done with the sled implementation.

Supersedes: https://cl.tvl.fyi/c/depot/+/11692
Change-Id: I744619c51bf2efd0fb63659b12a27cbe0b2fd6fc
Signed-off-by: Ilan Joselevich <personal@ilanjoselevich.com>
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11995
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI

tvix/castore/Cargo.toml

@@ -40,6 +40,7 @@ petgraph = "0.6.4"
 erased-serde = "0.4.5"
 serde_tagged = "0.3.0"
 hyper-util = "0.1.6"
+redb = "2.1.1"
 
 [dependencies.bigtable_rs]
 optional = true

tvix/castore/src/errors.rs

@@ -33,6 +33,42 @@ impl From<crate::tonic::Error> for Error {
     }
 }
 
+impl From<redb::Error> for Error {
+    fn from(value: redb::Error) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}
+
+impl From<redb::DatabaseError> for Error {
+    fn from(value: redb::DatabaseError) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}
+
+impl From<redb::TableError> for Error {
+    fn from(value: redb::TableError) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}
+
+impl From<redb::TransactionError> for Error {
+    fn from(value: redb::TransactionError) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}
+
+impl From<redb::StorageError> for Error {
+    fn from(value: redb::StorageError) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}
+
+impl From<redb::CommitError> for Error {
+    fn from(value: redb::CommitError) -> Self {
+        Error::StorageError(value.to_string())
+    }
+}
+
 impl From<std::io::Error> for Error {
     fn from(value: std::io::Error) -> Self {
         if value.kind() == std::io::ErrorKind::InvalidInput {