/*
Copyright 2017 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package validate

import (
	"context"
	"strings"
	"time"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	internalapi "k8s.io/cri-api/pkg/apis"
	runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"

	"sigs.k8s.io/cri-tools/pkg/common"
	"sigs.k8s.io/cri-tools/pkg/framework"
)

var _ = framework.KubeDescribe("PodSandbox", func() {
	f := framework.NewDefaultCRIFramework()

	var rc internalapi.RuntimeService
	var ic internalapi.ImageManagerService

	BeforeEach(func() {
		rc = f.CRIClient.CRIRuntimeClient
		ic = f.CRIClient.CRIImageClient
	})

	Context("runtime should support sysctls", func() {
		var podID string
		var podConfig *runtimeapi.PodSandboxConfig

		AfterEach(func() {
			By("stop PodSandbox")
			Expect(rc.StopPodSandbox(context.TODO(), podID)).NotTo(HaveOccurred())
			By("delete PodSandbox")
			Expect(rc.RemovePodSandbox(context.TODO(), podID)).NotTo(HaveOccurred())
		})

		It("should support safe sysctls", func() {
			podID, podConfig = createSandboxWithSysctls(rc, map[string]string{
				"kernel.shm_rmid_forced": "1",
			})

			By("create a default container")
			containerID := framework.CreateDefaultContainer(rc, ic, podID, podConfig, "container-shm-rmid-forced")

			By("start container")
			startContainer(rc, containerID)

			By("check sysctls kernel.shm_rmid_forced")
			checkSetSysctls(rc, containerID, "/proc/sys/kernel/shm_rmid_forced", "1")
		})

		It("should support unsafe sysctls", func() {
			podID, podConfig = createSandboxWithSysctls(rc, map[string]string{
				"fs.mqueue.msg_max": "100",
			})

			By("create a default container")
			containerID := framework.CreateDefaultContainer(rc, ic, podID, podConfig, "container-fs-mqueue-msg-max")

			By("start container")
			startContainer(rc, containerID)

			By("check sysctls fs.mqueue.msg_max")
			checkSetSysctls(rc, containerID, "/proc/sys/fs/mqueue/msg_max", "100")
		})
	})
})

// createSandboxWithSysctls creates a PodSandbox with specified sysctls.
func createSandboxWithSysctls(rc internalapi.RuntimeService, sysctls map[string]string) (string, *runtimeapi.PodSandboxConfig) {
	By("create a PodSandbox with sysctls")

	podSandboxName := "pod-sandbox-with-sysctls-" + framework.NewUUID()
	uid := framework.DefaultUIDPrefix + framework.NewUUID()
	namespace := framework.DefaultNamespacePrefix + framework.NewUUID()
	podConfig := &runtimeapi.PodSandboxConfig{
		Metadata: framework.BuildPodSandboxMetadata(podSandboxName, uid, namespace, framework.DefaultAttempt),
		Linux: &runtimeapi.LinuxPodSandboxConfig{
			CgroupParent: common.GetCgroupParent(context.TODO(), rc),
			Sysctls:      sysctls,
		},
	}

	return framework.RunPodSandbox(rc, podConfig), podConfig
}

// checkSetSysctls checks whether sysctl settings is equal to expected string.
func checkSetSysctls(rc internalapi.RuntimeService, containerID, sysctlPath, expected string) {
	cmd := []string{"cat", sysctlPath}
	stdout, _, err := rc.ExecSync(context.TODO(), containerID, cmd, time.Duration(defaultExecSyncTimeout)*time.Second)
	Expect(err).NotTo(HaveOccurred())
	Expect(strings.TrimSpace(string(stdout))).To(Equal(expected))
}