Adds command to remove chain_data (#2954)

src/bin/grin.rs

@@ -169,6 +169,16 @@ fn real_main() -> i32 {
 		// client commands and options
 		("client", Some(client_args)) => cmd::client_command(client_args, node_config.unwrap()),
 
+		// clean command
+		("clean", _) => {
+			let db_root_path = node_config.unwrap().members.unwrap().server.db_root;
+			println!("Cleaning chain data directory: {}", db_root_path);
+			match std::fs::remove_dir_all(db_root_path) {
+				Ok(_) => 0,
+				Err(_) => 1,
+			}
+		},
+
 		// If nothing is specified, try to just use the config file instead
 		// this could possibly become the way to configure most things
 		// with most command line options being phased out

src/bin/grin.yml

@@ -12,6 +12,8 @@ args:
       long: usernet
       takes_value: false
 subcommands:
+  - clean:
+      about: Clean Grin chain data
   - wallet:
       about: As of v1.1.0, the wallet has been split into a separate executable. See https://github.com/mimblewimble/grin-wallet/releases
       usage: As of v1.1.0, the wallet has been split into a separate executable. See https://github.com/mimblewimble/grin-wallet/releases to download