Implement detect-engine-arch command

Author: 0xEAB

tools/ddct-src/App.php

@@ -49,6 +49,7 @@ private function runCommand(int $argc, array $argv): int
             'build-selection'          => $this->buildSelection        ($argc, $argv),
             'can-build'                => $this->canBuild              ($argc, $argv),
             'detect-engine'            => $this->detectEngine          ($argc, $argv),
+            'detect-engine-arch'       => $this->detectEngineArch      ($argc, $argv),
             'generate'                 => $this->generate              ($argc, $argv),
             'generate-all'             => $this->generateAll           ($argc, $argv),
             'has-built'                => $this->hasBuilt              ($argc, $argv),
@@ -261,6 +262,21 @@ private function detectEngine(int $argc, array $argv): int
         return 0;
     }
 
+    private function detectEngineArch(int $argc, array $argv): int
+    {
+        $containerEngine = new ContainerEngine();
+
+        try {
+            $arch = $containerEngine->getArch();
+        } catch (Exception $ex) {
+            errorln($ex->getMessage());
+            return 1;
+        }
+
+        outputln($arch);
+        return 0;
+    }
+
     private function namespaceRemoveAll(int $argc, array $argv): int
     {
         if ($argc !== 2) {

tools/ddct-src/Util/ContainerEngine.php

@@ -169,6 +169,51 @@ public function pushImage(string $name): void
         $this->passthruCommand('push', $name);
     }
 
+    private function getArchDocker(): string
+    {
+        $json = $this->executeCommand('version', '--format={{ json .Server.Arch }}');
+
+        if (!isset($json[0])) {
+            throw new Exception('No data received.');
+        }
+
+        return json_decode($json[0], true, JSON_THROW_ON_ERROR);
+    }
+
+    private function getArchPodman(): string
+    {
+        $json = $this->executeCommand('version', '--format={{ json .OsArch }}');
+
+        if (!isset($json[0])) {
+            throw new Exception('No data received.');
+        }
+
+        $osArch = json_decode($json[0], true, JSON_THROW_ON_ERROR);
+        $osArchSplit = explode('/', $osArch);
+        return end($osArchSplit);
+    }
+
+    public function getArch(): string
+    {
+        if (stripos($this->containerEngine, 'docker') !== false) {
+            return $this->getArchDocker();
+        }
+        if (stripos($this->containerEngine, 'podman') !== false) {
+            return $this->getArchPodman();
+        }
+
+        try {
+            return $this->getArchDocker();
+        } catch (Exception) {
+        }
+        try {
+            return $this->getArchPodman();
+        } catch (Exception) {
+        }
+
+        throw new Exception('Unable to determine CPU architecture of container engine.');
+    }
+
     public static function detectContainerEngine(): ?string
     {
         if (isset($_SERVER['CONTAINER_ENGINE'])) {