Add tty password input (#2503)

* Add tty password input

* Move password from core/service to core/cli

* Fix test build error

* Password should be entered only once if it's for decoding

* Update Cargo.lock from rebuild

substrate/core/cli/src/lib.rs

@@ -365,6 +365,11 @@ fn fill_network_configuration(
 	Ok(())
 }
 
+fn input_keystore_password() -> Result<String, String> {
+	rpassword::read_password_from_tty(Some("Keystore password: "))
+		.map_err(|e| format!("{:?}", e))
+}
+
 fn create_run_node_config<F, S>(
 	cli: RunCmd, spec_factory: S, impl_name: &'static str, version: &VersionInfo
 ) -> error::Result<FactoryFullConfiguration<F>>
@@ -374,6 +379,9 @@ where
 {
 	let spec = load_spec(&cli.shared_params, spec_factory)?;
 	let mut config = service::Configuration::default_with_spec(spec.clone());
+	if cli.interactive_password {
+		config.password = input_keystore_password()?
+	}
 
 	config.impl_name = impl_name;
 	config.impl_commit = version.commit;

substrate/core/cli/src/params.rs

@@ -395,6 +395,10 @@ pub struct RunCmd {
 	/// Enable authoring even when offline.
 	#[structopt(long = "force-authoring")]
 	pub force_authoring: bool,
+
+	/// Interactive password for validator key.
+	#[structopt(short = "i")]
+	pub interactive_password: bool,
 }
 
 /// Stores all required Cli values for a keyring test account.