composer/plugin/docker4drupal#48 Call external command only if config file changed

Traefik.php

@@ -102,13 +102,29 @@ class Traefik {
     if (!$fs->exists($traefikConfigPath)) {
       $fs->mkdir($traefikConfigPath);
     }
-    file_put_contents($traefikConfigPath . '/certificates.toml', $this->defaultCertificatesConfig());
-    file_put_contents($traefikFile, Yaml::dump($this->defaultDockerCompose(), 9, 2));
-    $cwd = getcwd();
-    chdir($traefikPath);
-    exec('docker network create traefik-public 2>/dev/null');
-    exec('docker compose --project-name traefik up -d');
-    chdir($cwd);
+    $upd1 = $this->updateFile($traefikConfigPath . '/certificates.toml', $this->defaultCertificatesConfig());
+    $upd2 = $this->updateFile($traefikFile, Yaml::dump($this->defaultDockerCompose(), 9, 2));
+    if ($upd1 || $upd2) {
+      $cwd = getcwd();
+      chdir($traefikPath);
+      exec('docker network create traefik-public 2>/dev/null');
+      exec('docker compose --project-name traefik up -d');
+      chdir($cwd);
+    }
+  }
+
+  /**
+   * @param string $filename
+   * @param string $content
+   *
+   * @return bool
+   */
+  private function updateFile(string $filename, string $content): bool {
+    if (file_exists($filename) && file_get_contents($filename) === $content) {
+      return FALSE;
+    }
+    file_put_contents($filename, $content);
+    return TRUE;
   }
 
   /**