feat: add app.runningUnderRosettaTranslation to detect running under rosetta (#26444)

* feat: add app.isRunningUnderRosettaTranslation to detect running under rosetta

* chore: fixup

* chore: make const

* chore: add missing import

docs/api/app.md

@@ -1489,3 +1489,12 @@ which native modules you can use in the renderer process.  For more information
 on the direction Electron is going with renderer process restarts and usage of
 native modules in the renderer process please check out this
 [Tracking Issue](https://github.com/electron/electron/issues/18397).
+
+### `app.runningUnderRosettaTranslation` _macOS_ _Readonly_
+
+A `Boolean` which when `true` indicates that the app is currently running
+under the [Rosetta Translator Environment](https://en.wikipedia.org/wiki/Rosetta_(software)).
+
+You can use this property to prompt users to download the arm64 version of
+your application when they are running the x64 version under Rosetta
+incorrectly.

shell/browser/api/electron_api_app.cc

@@ -1666,6 +1666,8 @@ gin::ObjectTemplateBuilder App::GetObjectTemplateBuilder(v8::Isolate* isolate) {
 #endif
 #if defined(OS_MAC)
       .SetProperty("dock", &App::GetDockAPI)
+      .SetProperty("runningUnderRosettaTranslation",
+                   &App::IsRunningUnderRosettaTranslation)
 #endif
       .SetProperty("userAgentFallback", &App::GetUserAgentFallback,
                    &App::SetUserAgentFallback)

shell/browser/api/electron_api_app.h

@@ -221,6 +221,7 @@ class App : public ElectronBrowserClient::Delegate,
   bool MoveToApplicationsFolder(gin_helper::ErrorThrower, gin::Arguments* args);
   bool IsInApplicationsFolder();
   v8::Local<v8::Value> GetDockAPI(v8::Isolate* isolate);
+  bool IsRunningUnderRosettaTranslation() const;
   v8::Global<v8::Value> dock_;
 #endif
 

shell/browser/api/electron_api_app_mac.mm

@@ -9,6 +9,7 @@
 #include "shell/common/electron_paths.h"
 
 #import <Cocoa/Cocoa.h>
+#import <sys/sysctl.h>
 
 namespace electron {
 
@@ -58,6 +59,16 @@ void App::SetActivationPolicy(gin_helper::ErrorThrower thrower,
   [NSApp setActivationPolicy:activation_policy];
 }
 
+bool App::IsRunningUnderRosettaTranslation() const {
+  int proc_translated = 0;
+  size_t size = sizeof(proc_translated);
+  if (sysctlbyname("sysctl.proc_translated", &proc_translated, &size, NULL,
+                   0) == -1) {
+    return false;
+  }
+  return proc_translated == 1;
+}
+
 }  // namespace api
 
 }  // namespace electron