refactor(opencode): simplify auth check by removing sentinel file verification

Remove complex CLI version check and sentinel file authentication in favor of simple binary existence check. OpenCode now works with zero config, only requiring CLI installation.

Author: moazbuilds

src/infra/engines/providers/opencode/auth.ts

@@ -24,35 +24,12 @@ function getSentinelPath(opencodeHome: string): string {
   return path.join(opencodeHome, 'data', SENTINEL_FILE);
 }
 
-async function isCliInstalled(command: string): Promise<boolean> {
-  try {
-    // Resolve command using Bun.which() to handle Windows .cmd files
-    const resolvedCommand = Bun.which(command) ?? command;
-
-    const proc = Bun.spawn([resolvedCommand, '--version'], {
-      stdout: 'pipe',
-      stderr: 'pipe',
-      stdin: 'ignore',
-    });
-
-    // Set a timeout
-    const timeout = new Promise<never>((_, reject) =>
-      setTimeout(() => reject(new Error('Timeout')), 3000)
-    );
-
-    const exitCode = await Promise.race([proc.exited, timeout]);
-    const stdout = await new Response(proc.stdout).text();
-    const stderr = await new Response(proc.stderr).text();
-    const out = `${stdout}\n${stderr}`;
-
-    if (typeof exitCode === 'number' && exitCode === 0) return true;
-    if (/not recognized as an internal or external command/i.test(out)) return false;
-    if (/command not found/i.test(out)) return false;
-    if (/No such file or directory/i.test(out)) return false;
-    return false;
-  } catch {
-    return false;
-  }
+/**
+ * Check if CLI binary exists in PATH (instant, no subprocess)
+ * OpenCode works with zero config - just needs to be installed
+ */
+function isCliInstalled(command: string): boolean {
+  return Bun.which(command) !== null;
 }
 
 function logInstallHelp(): void {
@@ -70,24 +47,9 @@ function logInstallHelp(): void {
 
 
 export async function isAuthenticated(): Promise<boolean> {
-  // First check if CLI is installed
-  const cliInstalled = await isCliInstalled(metadata.cliBinary);
-  if (!cliInstalled) {
-    return false;
-  }
-
-  // Check sentinel file (created after successful login via codemachine)
-  const opencodeHome = resolveOpenCodeHome();
-  const sentinelPath = getSentinelPath(opencodeHome);
-  try {
-    await stat(sentinelPath);
-    return true;
-  } catch {
-    // Sentinel not found, check OpenCode's native auth
-  }
-
-  // Check OpenCode's native credential file
-  return hasOpenCodeCredential('opencode');
+  // OpenCode works with zero config - just needs to be installed
+  // No auth check required; users can optionally login for specific APIs
+  return isCliInstalled(metadata.cliBinary);
 }
 
 /**
@@ -131,8 +93,7 @@ export async function ensureAuth(forceLogin = false): Promise<boolean> {
   await ensureDataDirExists(dataDir);
 
   // Check if CLI is installed
-  const cliInstalled = await isCliInstalled(metadata.cliBinary);
-  if (!cliInstalled) {
+  if (!isCliInstalled(metadata.cliBinary)) {
     logInstallHelp();
     throw new Error(`${metadata.name} CLI is not installed.`);
   }