Fix CLI setup again (#4851)

* Fix CLI setup again

We need to set `config_dir` and `database_path` for almost every
command.
This fixes `purge-chain` and also adds a test to make sure we don't
break it again.

* Adds missing test files

* Split methods

substrate/bin/node/cli/tests/common.rs

@@ -0,0 +1,34 @@
+// Copyright 2020 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 std::{process::{Child, ExitStatus}, thread, time::Duration};
+
+/// Wait for the given `child` the given ammount of `secs`.
+///
+/// Returns the `Some(exit status)` or `None` if the process did not finish in the given time.
+pub fn wait_for(child: &mut Child, secs: usize) -> Option<ExitStatus> {
+	for _ in 0..secs {
+		match child.try_wait().unwrap() {
+			Some(status) => return Some(status),
+			None => thread::sleep(Duration::from_secs(1)),
+		}
+	}
+	eprintln!("Took to long to exit. Killing...");
+	let _ = child.kill();
+	child.wait().unwrap();
+
+	None
+}

substrate/bin/node/cli/tests/purge_chain_works.rs

@@ -0,0 +1,53 @@
+// Copyright 2020 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, fs, path::PathBuf};
+
+mod common;
+
+#[test]
+#[cfg(unix)]
+fn purge_chain_works() {
+	use nix::sys::signal::{kill, Signal::SIGINT};
+	use nix::unistd::Pid;
+
+	let base_path = "purge_chain_test";
+
+	let _ = fs::remove_dir_all(base_path);
+	let mut cmd = Command::new(cargo_bin("substrate"))
+		.args(&["--dev", "-d", base_path])
+		.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());
+
+	let status = Command::new(cargo_bin("substrate"))
+		.args(&["purge-chain", "--dev", "-d", base_path, "-y"])
+		.status()
+		.unwrap();
+	assert!(status.success());
+
+	// Make sure that the `dev` chain folder exists, but the `db` is deleted.
+	assert!(PathBuf::from(base_path).join("chains/dev/").exists());
+	assert!(!PathBuf::from(base_path).join("chains/dev/db").exists());
+}

substrate/bin/node/cli/tests/running_the_node_and_interrupt.rs

@@ -15,10 +15,9 @@
 // along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
 
 use assert_cmd::cargo::cargo_bin;
-use std::convert::TryInto;
-use std::process::{Child, Command, ExitStatus};
-use std::thread::sleep;
-use std::time::Duration;
+use std::{convert::TryInto, process::Command, thread, time::Duration, fs};
+
+mod common;
 
 #[test]
 #[cfg(unix)]
@@ -26,27 +25,18 @@ fn running_the_node_works_and_can_be_interrupted() {
 	use nix::sys::signal::{kill, Signal::{self, SIGINT, SIGTERM}};
 	use nix::unistd::Pid;
 
-	fn wait_for(child: &mut Child, secs: usize) -> Option<ExitStatus> {
-		for _ in 0..secs {
-			match child.try_wait().unwrap() {
-				Some(status) => return Some(status),
-				None => sleep(Duration::from_secs(1)),
-			}
-		}
-		eprintln!("Took to long to exit. Killing...");
-		let _ = child.kill();
-		child.wait().unwrap();
-
-		None
-	}
-
 	fn run_command_and_kill(signal: Signal) {
-		let mut cmd = Command::new(cargo_bin("substrate")).spawn().unwrap();
-		sleep(Duration::from_secs(30));
+		let _ = fs::remove_dir_all("interrupt_test");
+		let mut cmd = Command::new(cargo_bin("substrate"))
+			.args(&["--dev", "-d", "interrupt_test"])
+			.spawn()
+			.unwrap();
+
+		thread::sleep(Duration::from_secs(30));
 		assert!(cmd.try_wait().unwrap().is_none(), "the process should still be running");
 		kill(Pid::from_raw(cmd.id().try_into().unwrap()), signal).unwrap();
 		assert_eq!(
-			wait_for(&mut cmd, 30).map(|x| x.success()),
+			common::wait_for(&mut cmd, 30).map(|x| x.success()),
 			Some(true),
 			"the pocess must exit gracefully after signal {}",
 			signal,