Removes `base` from `IncrementalSnapshotHash` (#31185)

core/src/snapshot_packager_service/snapshot_gossip_manager.rs

@@ -47,7 +47,7 @@ impl SnapshotGossipManager {
         if let Some(starting_incremental_snapshot_hash) = starting_snapshot_hashes.incremental {
             self.update_latest_incremental_snapshot_hash(
                 starting_incremental_snapshot_hash.hash,
-                starting_incremental_snapshot_hash.base.0,
+                starting_snapshot_hashes.full.hash.0,
             );
         }
         self.push_latest_snapshot_hashes_to_cluster();

ledger/src/bank_forks_utils.rs

@@ -236,7 +236,6 @@ fn bank_forks_from_snapshot(
     let starting_incremental_snapshot_hash =
         incremental_snapshot_archive_info.map(|incremental_snapshot_archive_info| {
             IncrementalSnapshotHash {
-                base: full_snapshot_hash.hash,
                 hash: (
                     incremental_snapshot_archive_info.slot(),
                     *incremental_snapshot_archive_info.hash(),

runtime/src/snapshot_hash.rs

@@ -25,11 +25,9 @@ pub struct FullSnapshotHash {
 }
 
 /// Used by SnapshotPackagerService and SnapshotGossipManager, this struct adds type safety to
-/// ensure an incremental snapshot hash is pushed to the right CRDS.  `base` is the (full) snapshot
-/// this incremental snapshot (`hash`) is based on.
+/// ensure an incremental snapshot hash is pushed to the right CRDS.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct IncrementalSnapshotHash {
-    pub base: (Slot, SnapshotHash),
     pub hash: (Slot, SnapshotHash),
 }