tests: exercise behavior with kernel init params

Signed-off-by: Diana Popa <[email protected]>

Author: dianpopa

tests/integration_tests/functional/test_kernel_cmdline.py

@@ -0,0 +1,34 @@
+# Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+"""Test kernel commandline behavior."""
+
+from framework.microvm import Serial
+
+
+def test_init_params(test_microvm_with_api):
+    """Correct propagation of boot args to the kernel's command line.
+
+    Test that init's parameters (the ones present after "--") do not get
+    altered or misplaced.
+
+    @type: functional
+    """
+    vm = test_microvm_with_api
+    vm.jailer.daemonize = False
+    vm.spawn()
+    vm.memory_monitor = None
+
+    # We will override the init with /bin/cat so that we try to read the
+    # Ubuntu version from the /etc/issue file.
+    vm.basic_config(
+        vcpu_count=1,
+        boot_args='console=ttyS0 reboot=k panic=1 pci=off'
+                  ' init=/bin/cat -- /etc/issue',
+    )
+
+    vm.start()
+    serial = Serial(vm)
+    serial.open()
+    # If the string does not show up, the test will fail.
+    serial.rx(token='Ubuntu 18.04 LTS')