Don't restart if we're not in the cradle.

parity/cli/usage.txt

@@ -351,6 +351,9 @@ Legacy Options:
   --extradata STRING       Equivalent to --extra-data STRING.
   --cache MB               Equivalent to --cache-size MB.
 
+Internal Options:
+  --can-restart            Executable will auto-restart if exiting with 125.  
+
 Miscellaneous Options:
   -c --config CONFIG       Specify a filename containing a configuration file.
                            (default: {flag_config})

parity/main.rs

@@ -142,12 +142,12 @@ enum PostExecutionAction {
 	Quit,
 }
 
-fn execute(command: Execute) -> Result<PostExecutionAction, String> {
+fn execute(command: Execute, can_restart: bool) -> Result<PostExecutionAction, String> {
 	let logger = setup_log(&command.logger).expect("Logger is initialized only once; qed");
 
 	match command.cmd {
 		Cmd::Run(run_cmd) => {
-			let restart = run::execute(run_cmd, logger)?;
+			let restart = run::execute(run_cmd, can_restart, logger)?;
 			Ok(if restart { PostExecutionAction::Restart } else { PostExecutionAction::Quit })
 		},
 		Cmd::Version => Ok(PostExecutionAction::Print(Args::print_version())),
@@ -160,7 +160,7 @@ fn execute(command: Execute) -> Result<PostExecutionAction, String> {
 	}
 }
 
-fn start() -> Result<PostExecutionAction, String> {
+fn start(can_restart: bool) -> Result<PostExecutionAction, String> {
 	let args: Vec<String> = env::args().collect();
 	let conf = Configuration::parse(&args).unwrap_or_else(|e| e.exit());
 
@@ -170,7 +170,7 @@ fn start() -> Result<PostExecutionAction, String> {
 	}
 
 	let cmd = try!(conf.into_command());
-	execute(cmd)
+	execute(cmd, can_restart)
 }
 
 #[cfg(not(feature="stratum"))]
@@ -204,8 +204,10 @@ fn latest_exe_path() -> Option<PathBuf> {
 
 // Starts ~/.parity-updates/parity and returns the code it exits with.
 fn run_parity() -> Option<i32> {
+	use ::std::ffi::OsString;
+	let prefix = vec![OsString::from("--can-restart"), OsString::from("--force-direct")];
 	latest_exe_path().and_then(|exe| process::Command::new(exe)
-			.args(&env::args_os().collect::<Vec<_>>())
+		.args(&(env::args_os().chain(prefix.into_iter()).collect::<Vec<_>>()))
 		.status()
 		.map(|es| es.code().unwrap_or(128))
 		.ok()
@@ -216,7 +218,7 @@ const PLEASE_RESTART_EXIT_CODE: i32 = 69;
 
 // Run our version of parity.
 // Returns the exit error code. 
-fn main_direct() -> i32 {
+fn main_direct(can_restart: bool) -> i32 {
 	let mut alt_mains = HashMap::new();
 	sync_main(&mut alt_mains);
 	stratum_main(&mut alt_mains);
@@ -224,7 +226,7 @@ fn main_direct() -> i32 {
 		f();
 		0
 	} else {
-		match start() {
+		match start(can_restart) {
 			Ok(result) => match result {
 				PostExecutionAction::Print(s) => { info!("{}", s); 0 },
 				PostExecutionAction::Restart => PLEASE_RESTART_EXIT_CODE,
@@ -270,7 +272,7 @@ fn main() {
 		loop {
 			// If we fail to run the updated parity then fallback to local version. 
 			trace_main!("Attempting to run latest update ({})...", latest_exe.as_ref().expect("guarded by have_update; latest_exe must exist for have_update; qed").display());
-			let exit_code = run_parity().unwrap_or_else(|| { trace_main!("Falling back to local..."); main_direct() });
+			let exit_code = run_parity().unwrap_or_else(|| { trace_main!("Falling back to local..."); main_direct(true) });
 			trace_main!("Latest exited with {}", exit_code);
 			if exit_code != PLEASE_RESTART_EXIT_CODE {
 				trace_main!("Quitting...");
@@ -281,6 +283,7 @@ fn main() {
 	} else {
 		trace_main!("Running direct");
 		// Otherwise, we're presumably running the version we want. Just run and fall-through.
-		process::exit(main_direct());
+		let can_restart = std::env::args().any(|arg| arg == "--can-restart");
+		process::exit(main_direct(can_restart));
 	}
 }

parity/run.rs

@@ -116,7 +116,7 @@ pub fn open_ui(dapps_conf: &dapps::Configuration, signer_conf: &signer::Configur
 	Ok(())
 }
 
-pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<bool, String> {
+pub fn execute(cmd: RunCmd, can_restart: bool, logger: Arc<RotatingLogger>) -> Result<bool, String> {
 	if cmd.ui && cmd.dapps_conf.enabled {
 		// Check if Parity is already running
 		let addr = format!("{}:{}", cmd.dapps_conf.interface, cmd.dapps_conf.port);
@@ -415,7 +415,7 @@ pub fn execute(cmd: RunCmd, logger: Arc<RotatingLogger>) -> Result<bool, String>
 	}
 
 	// Handle exit
-	wait_for_exit(panic_handler, http_server, ipc_server, dapps_server, signer_server, updater);
+	wait_for_exit(panic_handler, http_server, ipc_server, dapps_server, signer_server, updater, can_restart);
 
 	info!("Finishing work, please wait...");
 
@@ -472,7 +472,8 @@ fn wait_for_exit(
 	_ipc_server: Option<IpcServer>,
 	_dapps_server: Option<WebappServer>,
 	_signer_server: Option<SignerServer>,
-	updater: Arc<Updater>
+	updater: Arc<Updater>,
+	can_restart: bool
 ) -> bool {
 	let exit = Arc::new((Mutex::new(false), Condvar::new()));
 
@@ -485,8 +486,12 @@ fn wait_for_exit(
 	panic_handler.on_panic(move |_reason| { e.1.notify_all(); });
 
 	// Handle updater wanting to restart us
+	if can_restart {
 		let e = exit.clone();
 		updater.set_exit_handler(move || { *e.0.lock() = true; e.1.notify_all(); });
+	} else {
+		updater.set_exit_handler(|| info!("Update installed; ready for restart."));
+	}
 
 	// Wait for signal
 	let mut l = exit.0.lock();