fix: false loader path

config.example.toml

@@ -2,7 +2,7 @@
 # Some fields are optional and can be omitted, in which case the default value, if present, will be used.
 
 # Chain spec ID. Supported values:
-# A network ID. Supported values: Mainnet, Holesky, Helder.
+# A network ID. Supported values: Mainnet, Holesky, Sepolia, Helder.
 # A path to a chain spec file, either in .json format (e.g., as returned by the beacon endpoint /eth/v1/config/spec), or in .yml format (see examples in tests/data).
 # A custom object, e.g., chain = { genesis_time_secs = 1695902400, slot_time_secs = 12, genesis_fork_version = "0x01017000" }.
 chain = "Holesky"

crates/common/src/config/mod.rs

@@ -3,7 +3,7 @@ use std::path::PathBuf;
 use eyre::Result;
 use serde::{Deserialize, Serialize};
 
-use crate::types::{load_chain_from_file, Chain};
+use crate::types::{load_chain_from_file, Chain, ChainLoader};
 
 mod constants;
 mod log;
@@ -73,7 +73,13 @@ impl CommitBoostConfig {
     /// Returns the path to the chain spec file if any
     pub fn chain_spec_file(path: &str) -> Option<PathBuf> {
         match load_from_file::<ChainConfig>(path) {
-            Ok(config) => Some(config.chain),
+            Ok(config) => {
+                if let ChainLoader::Path(path_buf) = config.chain {
+                    Some(path_buf)
+                } else {
+                    None
+                }
+            }
             Err(_) => None,
         }
     }
@@ -82,7 +88,7 @@ impl CommitBoostConfig {
 /// Helper struct to load the chain spec file
 #[derive(Deserialize)]
 struct ChainConfig {
-    chain: PathBuf,
+    chain: ChainLoader,
 }
 
 /// Helper struct to load the rest of the config

crates/common/src/types.rs

@@ -161,7 +161,7 @@ impl From<KnownChain> for Chain {
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
-enum ChainLoader {
+pub enum ChainLoader {
     Known(KnownChain),
     Path(PathBuf),
     Custom { genesis_time_secs: u64, slot_time_secs: u64, genesis_fork_version: Bytes },