Fatdb integration with CLI (#1464)

* fatdb integration

* --fat-db

* rerun with --pruning=archive comment

parity/cli.rs

@@ -203,6 +203,7 @@ Database Options:
   --db-compaction TYPE     Database compaction type. TYPE may be one of:
                            ssd - suitable for SSDs and fast HDDs;
                            hdd - suitable for slow HDDs [default: ssd].
+  --fat-db                 Fat database.
 
 Import/Export Options:
   --from BLOCK             Export from block BLOCK, which may be an index or
@@ -362,6 +363,7 @@ pub struct Args {
 	pub flag_ipcapi: Option<String>,
 	pub flag_db_cache_size: Option<usize>,
 	pub flag_db_compaction: String,
+	pub flag_fat_db: bool,
 }
 
 pub fn print_version() {

parity/configuration.rs

@@ -333,6 +333,14 @@ impl Configuration {
 			_ => { die!("Invalid pruning method given."); }
 		};
 
+		if self.args.flag_fat_db {
+			if let journaldb::Algorithm::Archive = client_config.pruning {
+				client_config.trie_spec = TrieSpec::Fat;
+			} else {
+				die!("Fatdb is not supported. Please rerun with --pruning=archive")
+			}
+		}
+
 		// forced state db cache size if provided
 		client_config.db_cache_size = self.args.flag_db_cache_size.and_then(|cs| Some(cs / 4));