Rename rococo-collator to polkadot-collator (#435)

* Rename `rococo-collator` to `polkadot-collator`

Also contains some other small changes.

* Test fixes and some further search&replace

polkadot-parachains/tests/purge_chain_works.rs

@@ -0,0 +1,77 @@
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use assert_cmd::cargo::cargo_bin;
+use std::{convert::TryInto, process::Command, thread, time::Duration};
+
+mod common;
+
+#[test]
+#[cfg(unix)]
+fn purge_chain_works() {
+	fn run_node_and_stop() -> tempfile::TempDir {
+		use nix::{
+			sys::signal::{kill, Signal::SIGINT},
+			unistd::Pid,
+		};
+
+		let base_path = tempfile::tempdir().unwrap();
+
+		let mut cmd = Command::new(cargo_bin("polkadot-collator"))
+			.args(&["-d"])
+			.arg(base_path.path())
+			.args(&["--"])
+			.spawn()
+			.unwrap();
+
+		// Let it produce some blocks.
+		thread::sleep(Duration::from_secs(30));
+		assert!(
+			cmd.try_wait().unwrap().is_none(),
+			"the process should still be running"
+		);
+
+		// Stop the process
+		kill(Pid::from_raw(cmd.id().try_into().unwrap()), SIGINT).unwrap();
+		assert!(common::wait_for(&mut cmd, 30)
+			.map(|x| x.success())
+			.unwrap_or_default());
+
+		base_path
+	}
+
+	// Check that both databases are deleted
+	{
+		let base_path = run_node_and_stop();
+
+		assert!(base_path.path().join("chains/local_testnet/db").exists());
+		assert!(base_path.path().join("polkadot/chains/westend_dev/db").exists());
+
+		let status = Command::new(cargo_bin("polkadot-collator"))
+			.args(&["purge-chain", "-d"])
+			.arg(base_path.path())
+			.arg("-y")
+			.status()
+			.unwrap();
+		assert!(status.success());
+
+		// Make sure that the `parachain_local_testnet` chain folder exists, but the `db` is deleted.
+		assert!(base_path.path().join("chains/local_testnet").exists());
+		assert!(!base_path.path().join("chains/local_testnet/db").exists());
+		assert!(base_path.path().join("polkadot/chains/westend_dev").exists());
+		assert!(!base_path.path().join("polkadot/chains/westend_dev/db").exists());
+	}
+}