fix: Ensure we run from the applications folder

src/main/appfolder.js

@@ -0,0 +1,46 @@
+const { app, dialog } = require("electron");
+
+// If the app doesn't run from the /Applications folder,
+// we don't get to create files, which keeps the emulator from
+// running.
+function moveToAppFolderMaybe() {
+  if (process.platform !== "darwin") {
+    return;
+  }
+
+  if (app.isInApplicationsFolder()) {
+    return;
+  }
+
+  const shouldMove = dialog.showMessageBoxSync({
+    type: "question",
+    buttons: ["Move to Applications Folder", "Quit"],
+    defaultId: 0,
+    message:
+      "macintosh.js can only run from the Applications folder. Do you want to move the app there now?",
+    cancelId: 1,
+  });
+
+  if (shouldMove === 0) {
+    app.moveToApplicationsFolder({
+      conflictHandler: (conflictType) => {
+        if (conflictType === "exists") {
+          return (
+            dialog.showMessageBoxSync({
+              type: "question",
+              buttons: ["Halt Move", "Continue Move"],
+              defaultId: 0,
+              message: "An app of this name already exists",
+            }) === 1
+          );
+        }
+      },
+    });
+  } else {
+    app.quit();
+  }
+}
+
+module.exports = {
+  moveToAppFolderMaybe,
+};

src/main/index.js

@@ -5,10 +5,12 @@ const { createWindow } = require("./windows");
 const { getIsDevMode } = require("./devmode");
 const { shouldQuit } = require("./squirrel");
 const { setupUpdates } = require("./update");
+const { moveToAppFolderMaybe } = require("./appfolder");
 
 async function onReady() {
   if (!getIsDevMode()) process.env.NODE_ENV = "production";
 
+  moveToAppFolderMaybe();
   registerIpcHandlers();
   createWindow();
   setupUpdates();