// +build daemon,!windows,experimental

package main

import (
	"io/ioutil"
	"os"
	"os/exec"
	"strings"
	"time"

	"github.com/go-check/check"
)

// TestDaemonRestartWithKilledRunningContainer requires live restore of running containers
func (s *DockerDaemonSuite) TestDaemonRestartWithKilledRunningContainer(t *check.C) {
	// TODO(mlaventure): Not sure what would the exit code be on windows
	testRequires(t, DaemonIsLinux)
	if err := s.d.StartWithBusybox(); err != nil {
		t.Fatal(err)
	}

	cid, err := s.d.Cmd("run", "-d", "--name", "test", "busybox", "top")
	defer s.d.Stop()
	if err != nil {
		t.Fatal(cid, err)
	}
	cid = strings.TrimSpace(cid)

	// Kill the daemon
	if err := s.d.Kill(); err != nil {
		t.Fatal(err)
	}

	// kill the container
	runCmd := exec.Command(ctrBinary, "--address", "unix:///var/run/docker/libcontainerd/docker-containerd.sock", "containers", "kill", cid)
	if out, ec, err := runCommandWithOutput(runCmd); err != nil {
		t.Fatalf("Failed to run ctr, ExitCode: %d, err: '%v' output: '%s' cid: '%s'\n", ec, err, out, cid)
	}

	// Give time to containerd to process the command if we don't
	// the exit event might be received after we do the inspect
	time.Sleep(3 * time.Second)

	// restart the daemon
	if err := s.d.Start(); err != nil {
		t.Fatal(err)
	}

	// Check that we've got the correct exit code
	out, err := s.d.Cmd("inspect", "-f", "{{.State.ExitCode}}", cid)
	t.Assert(err, check.IsNil)

	out = strings.TrimSpace(out)
	if out != "143" {
		t.Fatalf("Expected exit code '%s' got '%s' for container '%s'\n", "143", out, cid)
	}

}

// os.Kill should kill daemon ungracefully, leaving behind live containers.
// The live containers should be known to the restarted daemon. Stopping
// them now, should remove the mounts.
func (s *DockerDaemonSuite) TestCleanupMountsAfterDaemonCrash(c *check.C) {
	testRequires(c, DaemonIsLinux)
	c.Assert(s.d.StartWithBusybox("--live-restore"), check.IsNil)

	out, err := s.d.Cmd("run", "-d", "busybox", "top")
	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))
	id := strings.TrimSpace(out)

	c.Assert(s.d.cmd.Process.Signal(os.Kill), check.IsNil)
	mountOut, err := ioutil.ReadFile("/proc/self/mountinfo")
	c.Assert(err, check.IsNil, check.Commentf("Output: %s", mountOut))

	// container mounts should exist even after daemon has crashed.
	comment := check.Commentf("%s should stay mounted from older daemon start:\nDaemon root repository %s\n%s", id, s.d.folder, mountOut)
	c.Assert(strings.Contains(string(mountOut), id), check.Equals, true, comment)

	// restart daemon.
	if err := s.d.Restart("--live-restore"); err != nil {
		c.Fatal(err)
	}

	// container should be running.
	out, err = s.d.Cmd("inspect", "--format='{{.State.Running}}'", id)
	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))
	out = strings.TrimSpace(out)
	if out != "true" {
		c.Fatalf("Container %s expected to stay alive after daemon restart", id)
	}

	// 'docker stop' should work.
	out, err = s.d.Cmd("stop", id)
	c.Assert(err, check.IsNil, check.Commentf("Output: %s", out))

	// Now, container mounts should be gone.
	mountOut, err = ioutil.ReadFile("/proc/self/mountinfo")
	c.Assert(err, check.IsNil, check.Commentf("Output: %s", mountOut))
	comment = check.Commentf("%s is still mounted from older daemon start:\nDaemon root repository %s\n%s", id, s.d.folder, mountOut)
	c.Assert(strings.Contains(string(mountOut), id), check.Equals, false, comment)
}

// TestDaemonRestartWithUnpausedRunningContainer requires live restore of running containers.
func (s *DockerDaemonSuite) TestDaemonRestartWithUnpausedRunningContainer(t *check.C) {
	// TODO(mlaventure): Not sure what would the exit code be on windows
	testRequires(t, DaemonIsLinux)
	if err := s.d.StartWithBusybox("--live-restore"); err != nil {
		t.Fatal(err)
	}

	cid, err := s.d.Cmd("run", "-d", "--name", "test", "busybox", "top")
	defer s.d.Stop()
	if err != nil {
		t.Fatal(cid, err)
	}
	cid = strings.TrimSpace(cid)

	// pause the container
	if _, err := s.d.Cmd("pause", cid); err != nil {
		t.Fatal(cid, err)
	}

	// Kill the daemon
	if err := s.d.Kill(); err != nil {
		t.Fatal(err)
	}

	// resume the container
	runCmd := exec.Command(ctrBinary, "--address", "unix:///var/run/docker/libcontainerd/docker-containerd.sock", "containers", "resume", cid)
	if out, ec, err := runCommandWithOutput(runCmd); err != nil {
		t.Fatalf("Failed to run ctr, ExitCode: %d, err: '%v' output: '%s' cid: '%s'\n", ec, err, out, cid)
	}

	// Give time to containerd to process the command if we don't
	// the resume event might be received after we do the inspect
	time.Sleep(3 * time.Second)

	// restart the daemon
	if err := s.d.Start("--live-restore"); err != nil {
		t.Fatal(err)
	}

	// Check that we've got the correct status
	out, err := s.d.Cmd("inspect", "-f", "{{.State.Status}}", cid)
	t.Assert(err, check.IsNil)

	out = strings.TrimSpace(out)
	if out != "running" {
		t.Fatalf("Expected exit code '%s' got '%s' for container '%s'\n", "running", out, cid)
	}
	if _, err := s.d.Cmd("kill", cid); err != nil {
		t.Fatal(err)
	}
}