add --finalized-checkpoint-state suggestion to the TNS state download…

… timeout message (#6927)

beacon_chain/consensus_object_pools/block_clearance.nim

@@ -8,10 +8,8 @@
 {.push raises: [].}
 
 import
-  std/sequtils,
   chronicles,
   results,
-  stew/assign2,
   ../spec/[
     beaconstate, forks, signatures, signatures_batch,
     state_transition, state_transition_epoch],
@@ -504,10 +502,6 @@ proc addBackfillBlockData*(
           return ok()
         return err(error)
       startTick = Moment.now()
-      parentBlock = dag.getForkedBlock(parent.bid.root).get()
-      trustedStateRoot =
-        withBlck(parentBlock):
-          forkyBlck.message.state_root
       clearanceBlock = BlockSlotId.init(parent.bid, forkyBlck.message.slot)
       updateFlags1 = dag.updateFlags
         # TODO (cheatfate): {skipLastStateRootCalculation} flag here could

beacon_chain/trusted_node_sync.nim

@@ -16,9 +16,11 @@ import
   ./spec/[beaconstate, eth2_merkleization, forks, light_client_sync,
           network, presets,
           state_transition, deposit_snapshots],
-  "."/[beacon_clock, beacon_chain_db, era_db]
+  "."/[beacon_chain_db, era_db]
 
 from presto import RestDecodingError
+from "."/beacon_clock import
+  BeaconClock, fromFloatSeconds, getBeaconTimeFn, init
 
 const
   largeRequestsTimeout = 120.seconds # Downloading large items such as states.
@@ -337,7 +339,7 @@ proc doTrustedNodeSync*(
           else:
             tmp
         awaitWithTimeout(client.getStateV2(id, cfg), largeRequestsTimeout):
-          error "Attempt to download checkpoint state timed out"
+          error "Attempt to download checkpoint state timed out; https://nimbus.guide/trusted-node-sync.html#sync-from-checkpoint-files provides an alternative approach"
           quit 1
       except CatchableError as exc:
         error "Unable to download checkpoint state",