tests: Add agent stability test

This PR adds the agent stability test to stability test.

Signed-off-by: Gabriela Cervantes <gabriela.cervantes.tellez@intel.com>
(cherry picked from commit fd19f40)

tests/stability/agent_stability_test.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+#
+# Copyright (c) 2018-2023 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# This test will perform several execs to a
+# running container, the main purpose of this
+# test is to stress the agent
+
+set -e -x
+
+cidir=$(dirname "$0")
+
+source "${cidir}/../metrics/lib/common.bash"
+
+# Environment variables
+IMAGE="${IMAGE:-quay.io/prometheus/busybox:latest}"
+CONTAINER_NAME="${CONTAINER_NAME:-test}"
+PAYLOAD_ARGS="${PAYLOAD_ARGS:-tail -f /dev/null}"
+
+
+# Timeout is the duration of this test (seconds)
+# We want to stress the agent for a significant
+# time (approximately running for two days)
+timeout=186400
+start_time=$(date +%s)
+end_time=$((start_time+timeout))
+
+function setup {
+	restart_containerd_service
+	sudo ctr image pull $IMAGE
+	sudo ctr run --runtime=$CTR_RUNTIME -d $IMAGE $CONTAINER_NAME sh -c $PAYLOAD_ARGS
+}
+
+function exec_loop {
+	cmd="sudo ctr t exec --exec-id 1 $CONTAINER_NAME sh -c"
+	$cmd "echo 'hello world' > file"
+	$cmd "rm -rf /file"
+	$cmd "touch /tmp/execWorks"
+	$cmd "ls /tmp | grep execWorks"
+	$cmd "rm -rf /tmp/execWorks"
+	$cmd "ls /etc/foo" || echo "Fail expected"
+	$cmd "cat /tmp/one" || echo "Fail expected"
+	$cmd "exit 42" || echo "Fail expected"
+}
+
+function teardown {
+	echo "Ending stability test"
+	clean_env_ctr
+}
+trap teardown EXIT
+
+echo "Starting stability test"
+setup
+
+echo "Running stability test"
+while [[ $end_time > $(date +%s) ]]; do
+	exec_loop
+done