prevent multiple updates running simultaneously

We're the renderer to request for an update multiple times, then it'd
simply start both updates, at the same time, causing all kinds of
issues. This was only really realistically possible to happen if you
were to manually check for updates whilst an update automatically were
to be checked from right before then. As an example, when Viper starts
up, it'll by default check for updates for itself, then Northstar, if
you within that time frame checked for updates manually, it'll run both.

Now however, we check if an existing update is occurring, and do nothing
if so, this is both for Viper and Northstar updates.

1 files changed, 42 insertions, 2 deletions

diff --git a/src/modules/update.js b/src/modules/update.js
index 458b511..0876993 100644
--- a/src/modules/update.js
+++ b/src/modules/update.js
@@ -112,9 +112,18 @@ async function northstar_update_available() {
 // simply fetches it from GitHub and updates if it's outdated, very
 // useful. Not much we have to do on our side.
 update.viper = (autoinstall) => {
+	// stop if we're already in the process of updating
+	if (update.viper.updating) {
+		return;
+	}
+
+	update.viper.updating = true;
+
 	const { autoUpdater } = require("electron-updater");
 
 	if (! autoUpdater.isUpdaterActive()) {
+		update.viper.updating = false;
+
 		if (settings.nsupdate) {
 			update.northstar_autoupdate();
 		}
@@ -125,22 +134,32 @@ update.viper = (autoinstall) => {
 	if (autoinstall) {
 		autoUpdater.on("update-downloaded", (info) => {
 			autoUpdater.quitAndInstall();
+			update.viper.updating = false;
 		});
 	}
 
-	autoUpdater.on("error", (info) => {cli.exit(1)});
+	autoUpdater.on("error", (info) => {
+		update.viper.updating = false;
+		cli.exit(1)
+	});
+
 	autoUpdater.on("update-not-available", (info) => {
+		update.viper.updating = false;
+
 		// only check for NS updates if Viper itself has no updates and
 		// if NS auto updates is enabled.
 		if (settings.nsupdate || cli.hasArgs()) {
 			update.northstar_autoupdate();
 		}
+
 		cli.exit();
 	});
 
 	autoUpdater.checkForUpdatesAndNotify();
 }
 
+update.viper.updating = false;
+
 // removes all mods in "R2Northstar/mods" starting with "Northstar."
 function remove_core_mods() {
 	if (! gamepath.exists()) {return}
@@ -182,12 +201,23 @@ function remove_core_mods() {
 // `force_install` makes this function not care about whether or not
 // we're already up-to-date, forcing the install
 update.northstar = async (force_install) => {
+	// stop if we're already in the process of updating
+	if (update.northstar.updating) {
+		return;
+	}
+
+	update.northstar.updating = true;
+
 	if (await is_running.game()) {
+		update.northstar.updating = false;
 		console.error(lang("general.auto_updates.game_running"));
 		return false;
 	}
 
-	if (! gamepath.exists()) {return}
+	if (! gamepath.exists()) {
+		update.northstar.updating = false;
+		return;
+	}
 
 	ipcMain.emit("ns-update-event", "cli.update.checking");
 	console.info(lang("cli.update.checking"));
@@ -196,6 +226,7 @@ update.northstar = async (force_install) => {
 	let latest = await releases.latest.northstar();
 
 	if (latest && latest.version == false) {
+		update.northstar.updating = false;
 		ipcMain.emit("ns-update-event", "cli.update.noInternet");
 		return;
 	}
@@ -206,6 +237,9 @@ update.northstar = async (force_install) => {
 		console.ok(lang("cli.update.uptodate").replace("%s", ns_version));
 
 		win.log(lang("gui.update.uptodate"));
+
+		update.northstar.updating = false;
+
 		cli.exit();
 		return;
 	} else {
@@ -222,6 +256,7 @@ update.northstar = async (force_install) => {
 		if (res.statusCode !== 200) {
 			ipcMain.emit("ns-update-event", "cli.update.uptodate_short");
 			console.ok(lang("cli.update.uptodate"), ns_version);
+			update.northstar.updating = false;
 			return false;
 		}
 
@@ -336,10 +371,15 @@ update.northstar = async (force_install) => {
 				ipcMain.emit("ns-update-event", "cli.update.uptodate_short");
 				win.log(lang("gui.update.finished"));
 				console.ok(lang("cli.update.finished"));
+
+				update.northstar.updating = false;
+
 				cli.exit();
 			})
 		})
 	})
 }
 
+update.northstar.updating = false;
+
 module.exports = update;