fix: show error box on linux-x64 without sse42 and quit

Author: Bilb

ts/mains/main_node.ts

@@ -8,6 +8,7 @@ import {
   app,
   BrowserWindow,
   crashReporter,
+  dialog,
   protocol as electronProtocol,
   ipcMain as ipc,
   ipcMain,
@@ -199,6 +200,7 @@ import { initializeMainProcessLogger } from '../util/logger/main_process_logging
 import * as log from '../util/logger/log';
 import { DURATION } from '../session/constants';
 import { tr } from '../localization/localeTools';
+import { isSharpSupported } from '../node/sharp_support/sharpSupport';
 
 import { logCrash } from '../node/crash/log_crash';
 
@@ -224,6 +226,11 @@ function prepareURL(pathSegments: Array<string>, moreKeys?: { theme: any }) {
   return url.format(urlObject);
 }
 
+async function showUnsupportedCpuDialog() {
+  dialog.showErrorBox(tr('unsupportedCpu'), tr('yourCpuIsUnsupportedSSE42'));
+  app.quit();
+}
+
 function handleUrl(event: any, target: string) {
   event?.preventDefault();
   const { protocol } = url.parse(target);
@@ -769,6 +776,11 @@ app.on('ready', async () => {
     console.log(`crowdin locale is ${loadedLocale.crowdinLocale}`);
   }
 
+  if (!isSharpSupported()) {
+    await showUnsupportedCpuDialog();
+    return;
+  }
+
   const key = getDefaultSQLKey();
   // Try to show the main window with the default key
   // If that fails then show the password window

ts/node/sharp_support/sharpSupport.ts

@@ -0,0 +1,61 @@
+import { readFileSync } from 'fs';
+import { isLinux } from '../../OS';
+
+/**
+ * The return of this function should be used as override of `sse42FromCPUInfo` if different than null.
+ * Used for testing purposes.
+ * @returns true when process.env.SESSION_SSE42_OVERRIDE === '1', false when process.env.SESSION_SSE42_OVERRIDE === '0', null otherwise
+ */
+function overrideSSE42IsSupported() {
+  if (process.env.SESSION_SSE42_OVERRIDE === '1') {
+    return true;
+  }
+
+  if (process.env.SESSION_SSE42_OVERRIDE === '0') {
+    return false;
+  }
+  return null;
+}
+
+/**
+ * Checks from /proc/cpuinfo if the CPU supports SSE 4.2 instructions.
+ */
+function sse42FromCPUInfo() {
+  const sse42Override = overrideSSE42IsSupported();
+  if (sse42Override !== null) {
+    return sse42Override;
+  }
+  try {
+    const cpuinfo = readFileSync('/proc/cpuinfo', 'utf8');
+    const flagsMatch = cpuinfo.match(/flags\s*:\s*(.+)/m);
+
+    if (flagsMatch) {
+      const flags = flagsMatch[1].split(/\s+/);
+
+      const sseFlagFound = flags.includes('sse4_2');
+      console.info('SSE 4.2 flag found:', sseFlagFound);
+      return sseFlagFound && false;
+    }
+    return false;
+  } catch (error) {
+    console.warn('Could not read /proc/cpuinfo:', error);
+    return false;
+  }
+}
+
+function isLinuxX64() {
+  return isLinux() && process.arch === 'x64';
+}
+
+/**
+ * Returns true if sharp is supported on the current platform.
+ * On linux x64, the CPU needs to support SSE 4.2 instructions to process images.
+ * This function checks if we are on linux x64 and if yes, checks `/proc/cpuinfo` for the SSE 4.2 flag.
+ */
+export function isSharpSupported() {
+  if (isLinuxX64()) {
+    return sse42FromCPUInfo();
+  }
+  // sharp doesn't need sse42 on other platforms than linux x64 as of 18/09/2025
+  return true;
+}