CLI option force purge chain from filesystem (#855)

* Add option to force remove db from filesysten

--force-purge-chain-db-from-filesystem can be used anywhere on command line as opposed to purge-chain which is a sub-command and use a complete different set of arguments

node/src/cli.rs

@@ -84,6 +84,10 @@ pub struct Cli {
 	#[arg(long)]
 	pub no_hardware_benchmarks: bool,
 
+	/// Purge chain from storage, for that time when purge-chain subcommand cannot be used
+	#[arg(long)]
+	pub force_purge_chain_db_from_filesystem: bool,
+
 	/// Relay chain arguments
 	#[arg(raw = true)]
 	pub relaychain_args: Vec<String>,

node/src/command.rs

@@ -31,7 +31,7 @@ use sc_cli::{
 };
 use sc_service::config::{BasePath, PrometheusConfig};
 use sp_runtime::traits::AccountIdConversion;
-use std::net::SocketAddr;
+use std::{fs, net::SocketAddr};
 // default to Nodle parachain id
 const DEFAULT_PARA_ID: u32 = 2026;
 
@@ -248,6 +248,22 @@ pub fn run() -> Result<()> {
 					.map(|e| e.para_id)
 					.ok_or("Could not find parachain ID in chain-spec.")?;
 
+				if cli.force_purge_chain_db_from_filesystem {
+					let db_path =
+						config.database.path().and_then(|p| p.parent()).ok_or_else(|| {
+							sc_cli::Error::Input("Cannot purge custom database implementation".into())
+						})?;
+					match fs::remove_dir_all(&db_path) {
+						Ok(_) => {
+							log::warn!("🧯 Removed {:?}", &db_path);
+						}
+						Err(ref err) if err.kind() == std::io::ErrorKind::NotFound => {
+							log::error!("🧯 {:?} did not exist.", &db_path);
+						}
+						Err(err) => return Result::Err(err.into()),
+					}
+				};
+
 				let polkadot_cli = RelayChainCli::new(
 					&config,
 					[RelayChainCli::executable_name()]