fix: LC_ALL env should not be changed (#26508)

shell/browser/electron_browser_main_parts.cc

@@ -375,23 +375,34 @@ int ElectronBrowserMainParts::PreCreateThreads() {
   // which keys off of getenv("LC_ALL").
   // We must set this env first to make ui::ResourceBundle accept the custom
   // locale.
-  g_setenv("LC_ALL", locale.c_str(), TRUE);
+  std::unique_ptr<base::Environment> env(base::Environment::Create());
+  base::Optional<std::string> lc_all;
+  if (!locale.empty()) {
+    std::string str;
+    if (env->GetVar("LC_ALL", &str))
+      lc_all.emplace(std::move(str));
+    env->SetVar("LC_ALL", locale.c_str());
+  }
 #endif
 
   // Load resources bundle according to locale.
   std::string loaded_locale = LoadResourceBundle(locale);
 
-#if defined(OS_LINUX)
-  // Reset to the loaded locale if the custom locale is invalid.
-  if (loaded_locale != locale)
-    g_setenv("LC_ALL", loaded_locale.c_str(), TRUE);
-#endif
-
   // Initialize the app locale.
   std::string app_locale = l10n_util::GetApplicationLocale(loaded_locale);
   ElectronBrowserClient::SetApplicationLocale(app_locale);
   fake_browser_process_->SetApplicationLocale(app_locale);
 
+#if defined(OS_LINUX)
+  // Reset to the original LC_ALL since we should not be changing it.
+  if (!locale.empty()) {
+    if (lc_all)
+      env->SetVar("LC_ALL", *lc_all);
+    else
+      env->UnSetVar("LC_ALL");
+  }
+#endif
+
   // Force MediaCaptureDevicesDispatcher to be created on UI thread.
   MediaCaptureDevicesDispatcher::GetInstance();
 

spec-main/chromium-spec.ts

@@ -291,22 +291,32 @@ describe('web security', () => {
 describe('command line switches', () => {
   describe('--lang switch', () => {
     const currentLocale = app.getLocale();
-    const testLocale = (locale: string, result: string, done: () => void) => {
+    const testLocale = async (locale: string, result: string, printEnv: boolean = false) => {
       const appPath = path.join(fixturesPath, 'api', 'locale-check');
-      const electronPath = process.execPath;
-      let output = '';
-      const appProcess = ChildProcess.spawn(electronPath, [appPath, `--set-lang=${locale}`]);
+      const args = [appPath, `--set-lang=${locale}`];
+      if (printEnv) {
+        args.push('--print-env');
+      }
+      const appProcess = ChildProcess.spawn(process.execPath, args);
 
+      let output = '';
       appProcess.stdout.on('data', (data) => { output += data; });
-      appProcess.stdout.on('end', () => {
-        output = output.replace(/(\r\n|\n|\r)/gm, '');
-        expect(output).to.equal(result);
-        done();
-      });
+      await emittedOnce(appProcess.stdout, 'end');
+      output = output.replace(/(\r\n|\n|\r)/gm, '');
+      expect(output).to.equal(result);
     };
 
-    it('should set the locale', (done) => testLocale('fr', 'fr', done));
-    it('should not set an invalid locale', (done) => testLocale('asdfkl', currentLocale, done));
+    it('should set the locale', async () => testLocale('fr', 'fr'));
+    it('should not set an invalid locale', async () => testLocale('asdfkl', currentLocale));
+
+    const lcAll = String(process.env.LC_ALL);
+    ifit(process.platform === 'linux')('current process has a valid LC_ALL env', async () => {
+      // The LC_ALL env should not be set to DOM locale string.
+      expect(lcAll).to.not.equal(app.getLocale());
+    });
+    ifit(process.platform === 'linux')('should not change LC_ALL', async () => testLocale('fr', lcAll, true));
+    ifit(process.platform === 'linux')('should not change LC_ALL when setting invalid locale', async () => testLocale('asdfkl', lcAll, true));
+    ifit(process.platform === 'linux')('should not change LC_ALL when --lang is not set', async () => testLocale('', lcAll, true));
   });
 
   describe('--remote-debugging-port switch', () => {

spec/fixtures/api/locale-check/main.js

@@ -1,10 +1,16 @@
 const { app } = require('electron');
 
 const locale = process.argv[2].substr(11);
-app.commandLine.appendSwitch('lang', locale);
+if (locale.length !== 0) {
+  app.commandLine.appendSwitch('lang', locale);
+}
 
 app.whenReady().then(() => {
-  process.stdout.write(app.getLocale());
+  if (process.argv[3] === '--print-env') {
+    process.stdout.write(String(process.env.LC_ALL));
+  } else {
+    process.stdout.write(app.getLocale());
+  }
   process.stdout.end();
 
   app.quit();