[FrameworkBundle] Escape parameters when serializing a ContainerBuilder

Author: MatTheCat

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/ContainerBuilderDebugDumpPass.php

@@ -54,7 +54,7 @@ public function process(ContainerBuilder $container): void
 
             if (($bag = $container->getParameterBag()) instanceof EnvPlaceholderParameterBag) {
                 (new ResolveEnvPlaceholdersPass(null))->process($dump);
-                $dump->__construct(new EnvPlaceholderParameterBag($container->resolveEnvPlaceholders($bag->all())));
+                $dump->__construct(new EnvPlaceholderParameterBag($container->resolveEnvPlaceholders($this->escapeParameters($bag->all()))));
             }
 
             $fs = new Filesystem();
@@ -68,4 +68,18 @@ public function process(ContainerBuilder $container): void
             }
         }
     }
+
+    private function escapeParameters(array $parameters): array
+    {
+        $params = [];
+        foreach ($parameters as $k => $v) {
+            $params[$k] = match (true) {
+                \is_array($v) => $this->escapeParameters($v),
+                \is_string($v) => str_replace('%', '%%', $v),
+                default => $v,
+            };
+        }
+
+        return $params;
+    }
 }

src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ContainerLintCommandTest.php

@@ -44,6 +44,7 @@ public static function containerLintProvider(): array
     {
         return [
             ['escaped_percent.yml', false, 0, 'The container was linted successfully'],
+            ['escaped_percent.yml', true, 0, 'The container was linted successfully'],
             ['missing_env_var.yml', false, 0, 'The container was linted successfully'],
             ['missing_env_var.yml', true, 1, 'Environment variable not found: "BAR"'],
         ];