fix: improve initialization of epoch config (#12800)

The command `neard view-state -t cold view-chain` is failing when
there's a resharding at the epoch boundary.
This change in the way we initialize `epoch_manager` is fixing the
error.

tools/state-viewer/src/cli.rs

@@ -189,7 +189,7 @@ impl StateViewerSubCommand {
             StateViewerSubCommand::StateChanges(cmd) => cmd.run(home_dir, near_config, store),
             StateViewerSubCommand::StateParts(cmd) => cmd.run(home_dir, near_config, store),
             StateViewerSubCommand::StateStats(cmd) => cmd.run(home_dir, near_config, store),
-            StateViewerSubCommand::ViewChain(cmd) => cmd.run(near_config, store),
+            StateViewerSubCommand::ViewChain(cmd) => cmd.run(home_dir, near_config, store),
             StateViewerSubCommand::ViewGenesis(cmd) => cmd.run(home_dir, near_config, store),
             StateViewerSubCommand::ViewTrie(cmd) => cmd.run(store),
             StateViewerSubCommand::TrieIterationBenchmark(cmd) => cmd.run(near_config, store),
@@ -833,8 +833,8 @@ pub struct ViewChainCmd {
 }
 
 impl ViewChainCmd {
-    pub fn run(self, near_config: NearConfig, store: Store) {
-        view_chain(self.height, self.block, self.chunk, near_config, store);
+    pub fn run(self, home_dir: &Path, near_config: NearConfig, store: Store) {
+        view_chain(self.height, self.block, self.chunk, home_dir, near_config, store);
     }
 }
 

tools/state-viewer/src/commands.rs

@@ -736,6 +736,7 @@ pub(crate) fn view_chain(
     height: Option<BlockHeight>,
     view_block: bool,
     view_chunks: bool,
+    home_dir: &Path,
     near_config: NearConfig,
     store: Store,
 ) {
@@ -758,8 +759,8 @@ pub(crate) fn view_chain(
             }
         }
     };
-    let epoch_manager = EpochManager::new_from_genesis_config(store, &near_config.genesis.config)
-        .expect("Failed to start Epoch Manager");
+    let epoch_manager =
+        EpochManager::new_arc_handle(store, &near_config.genesis.config, Some(home_dir));
     let shard_layout = epoch_manager.get_shard_layout(block.header().epoch_id()).unwrap();
 
     let mut chunk_extras = vec![];