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machine_test.go
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machine_test.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 firecracker
import (
"bytes"
"context"
"errors"
"flag"
"io"
"io/ioutil"
"net"
"os"
"os/exec"
"os/signal"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"testing"
"time"
"github.com/containerd/fifo"
"github.com/sirupsen/logrus"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
models "github.com/firecracker-microvm/firecracker-go-sdk/client/models"
"github.com/firecracker-microvm/firecracker-go-sdk/client/operations"
ops "github.com/firecracker-microvm/firecracker-go-sdk/client/operations"
"github.com/firecracker-microvm/firecracker-go-sdk/fctesting"
)
const (
firecrackerBinaryPath = "firecracker"
firecrackerBinaryOverrideEnv = "FC_TEST_BIN"
defaultJailerBinary = "jailer"
jailerBinaryOverrideEnv = "FC_TEST_JAILER_BIN"
defaultTuntapName = "fc-test-tap0"
tuntapOverrideEnv = "FC_TEST_TAP"
testDataPathEnv = "FC_TEST_DATA_PATH"
sudoUID = "SUDO_UID"
sudoGID = "SUDO_GID"
)
var (
skipTuntap bool
testDataPath = "./testdata"
testDataLogPath = filepath.Join(testDataPath, "logs")
testDataBin = filepath.Join(testDataPath, "bin")
testRootfs = filepath.Join(testDataPath, "root-drive.img")
)
func init() {
flag.BoolVar(&skipTuntap, "test.skip-tuntap", false, "Disables tests that require a tuntap device")
if val := os.Getenv(testDataPathEnv); val != "" {
testDataPath = val
}
if err := os.MkdirAll(testDataLogPath, 0777); err != nil {
panic(err)
}
}
// Ensure that we can create a new machine
func TestNewMachine(t *testing.T) {
m, err := NewMachine(
context.Background(),
Config{
DisableValidation: true,
MachineCfg: models.MachineConfiguration{
VcpuCount: Int64(1),
MemSizeMib: Int64(100),
CPUTemplate: models.CPUTemplate(models.CPUTemplateT2),
HtEnabled: Bool(false),
},
},
WithLogger(fctesting.NewLogEntry(t)))
if err != nil {
t.Fatalf("failed to create new machine: %v", err)
}
m.Handlers.Validation = m.Handlers.Validation.Clear()
if m == nil {
t.Errorf("NewMachine did not create a Machine")
}
}
func TestJailerMicroVMExecution(t *testing.T) {
if testing.Short() {
t.Skip()
}
fctesting.RequiresRoot(t)
logPath := filepath.Join(testDataLogPath, "TestJailerMicroVMExecution")
err := os.MkdirAll(logPath, 0777)
require.NoError(t, err, "unable to create %s path", logPath)
jailerUID := 123
jailerGID := 100
if v := os.Getenv(sudoUID); v != "" {
if jailerUID, err = strconv.Atoi(v); err != nil {
t.Fatalf("Failed to parse %q", sudoUID)
}
}
if v := os.Getenv(sudoGID); v != "" {
if jailerGID, err = strconv.Atoi(v); err != nil {
t.Fatalf("Failed to parse %q", sudoGID)
}
}
// uses temp directory due to testdata's path being too long which causes a
// SUN_LEN error.
tmpDir, err := ioutil.TempDir(os.TempDir(), "jailer-test")
if err != nil {
t.Fatalf("Failed to create temporary directory: %v", err)
}
vmlinuxPath := filepath.Join(tmpDir, "vmlinux")
if err := copyFile(filepath.Join(testDataPath, "vmlinux"), vmlinuxPath, jailerUID, jailerGID); err != nil {
t.Fatalf("Failed to copy the vmlinux file: %v", err)
}
rootdrivePath := filepath.Join(tmpDir, "root-drive.img")
if err := copyFile(testRootfs, rootdrivePath, jailerUID, jailerGID); err != nil {
t.Fatalf("Failed to copy the root drive file: %v", err)
}
var nCpus int64 = 2
cpuTemplate := models.CPUTemplate(models.CPUTemplateT2)
var memSz int64 = 256
// short names and directory to prevent SUN_LEN error
id := "b"
jailerTestPath := tmpDir
os.MkdirAll(jailerTestPath, 0777)
socketPath := "TestJailerMicroVMExecution.socket"
logFifo := filepath.Join(tmpDir, "firecracker.log")
metricsFifo := filepath.Join(tmpDir, "firecracker-metrics")
capturedLog := filepath.Join(tmpDir, "writer.fifo")
fw, err := os.OpenFile(capturedLog, os.O_CREATE|os.O_RDWR, 0600)
require.NoError(t, err, "failed to open fifo writer file")
defer func() {
fw.Close()
exec.Command("cp", capturedLog, logPath).Run()
os.Remove(capturedLog)
os.Remove(filepath.Join(jailerTestPath, "firecracker", socketPath))
os.Remove(logFifo)
os.Remove(metricsFifo)
os.RemoveAll(tmpDir)
}()
logFd, err := os.OpenFile(
filepath.Join(logPath, "TestJailerMicroVMExecution.log"),
os.O_CREATE|os.O_RDWR,
0666)
require.NoError(t, err, "failed to create log file")
defer logFd.Close()
cfg := Config{
SocketPath: socketPath,
LogFifo: logFifo,
MetricsFifo: metricsFifo,
LogLevel: "Debug",
KernelImagePath: vmlinuxPath,
MachineCfg: models.MachineConfiguration{
VcpuCount: Int64(nCpus),
CPUTemplate: cpuTemplate,
MemSizeMib: Int64(memSz),
HtEnabled: Bool(false),
},
Drives: []models.Drive{
{
DriveID: String("1"),
IsRootDevice: Bool(true),
IsReadOnly: Bool(false),
PathOnHost: String(rootdrivePath),
},
},
JailerCfg: &JailerConfig{
JailerBinary: getJailerBinaryPath(),
GID: Int(jailerGID),
UID: Int(jailerUID),
NumaNode: Int(0),
ID: id,
ChrootBaseDir: jailerTestPath,
ExecFile: getFirecrackerBinaryPath(),
ChrootStrategy: NewNaiveChrootStrategy(vmlinuxPath),
Stdout: logFd,
Stderr: logFd,
},
FifoLogWriter: fw,
}
if _, err := os.Stat(vmlinuxPath); err != nil {
t.Fatalf("Cannot find vmlinux file: %s\n"+
`Verify that you have a vmlinux file at "%s" or set the `+
"`%s` environment variable to the correct location.",
err, vmlinuxPath, testDataPathEnv)
}
kernelImageInfo := syscall.Stat_t{}
if err := syscall.Stat(cfg.KernelImagePath, &kernelImageInfo); err != nil {
t.Fatalf("Failed to stat kernel image: %v", err)
}
if kernelImageInfo.Uid != uint32(jailerUID) || kernelImageInfo.Gid != uint32(jailerGID) {
t.Fatalf("Kernel image does not have the proper UID or GID.\n"+
"To fix this simply run:\n"+
"sudo chown %d:%d %s",
jailerUID, jailerGID, cfg.KernelImagePath)
}
for _, drive := range cfg.Drives {
driveImageInfo := syscall.Stat_t{}
drivePath := StringValue(drive.PathOnHost)
if err := syscall.Stat(drivePath, &driveImageInfo); err != nil {
t.Fatalf("Failed to stat kernel image: %v", err)
}
if driveImageInfo.Uid != uint32(jailerUID) || kernelImageInfo.Gid != uint32(jailerGID) {
t.Fatalf("Drive does not have the proper UID or GID.\n"+
"To fix this simply run:\n"+
"sudo chown %d:%d %s",
jailerUID, jailerGID, drivePath)
}
}
ctx := context.Background()
m, err := NewMachine(ctx, cfg, WithLogger(fctesting.NewLogEntry(t)))
if err != nil {
t.Fatalf("failed to create new machine: %v", err)
}
vmmCtx, vmmCancel := context.WithTimeout(ctx, 30*time.Second)
defer vmmCancel()
if err := m.Start(vmmCtx); err != nil {
t.Errorf("Failed to start VMM: %v", err)
}
m.StopVMM()
info, err := os.Stat(capturedLog)
assert.NoError(t, err, "failed to stat captured log file")
assert.NotEqual(t, 0, info.Size())
}
func TestMicroVMExecution(t *testing.T) {
if testing.Short() {
t.Skip()
}
var nCpus int64 = 2
cpuTemplate := models.CPUTemplate(models.CPUTemplateT2)
var memSz int64 = 256
socketPath := filepath.Join(testDataPath, "TestMicroVMExecution.sock")
logFifo := filepath.Join(testDataPath, "firecracker.log")
metricsFifo := filepath.Join(testDataPath, "firecracker-metrics")
capturedLog := filepath.Join(testDataPath, "writer.fifo")
fw, err := os.OpenFile(capturedLog, os.O_CREATE|os.O_RDWR, 0600)
require.NoError(t, err, "failed to open fifo writer file")
defer func() {
fw.Close()
os.Remove(capturedLog)
os.Remove(socketPath)
os.Remove(logFifo)
os.Remove(metricsFifo)
}()
vmlinuxPath := getVmlinuxPath(t)
networkIfaces := []NetworkInterface{{
StaticConfiguration: &StaticNetworkConfiguration{
MacAddress: "01-23-45-67-89-AB-CD-EF",
HostDevName: "tap0",
},
}}
cfg := Config{
SocketPath: socketPath,
LogFifo: logFifo,
MetricsFifo: metricsFifo,
LogLevel: "Debug",
MachineCfg: models.MachineConfiguration{
VcpuCount: Int64(nCpus),
CPUTemplate: cpuTemplate,
MemSizeMib: Int64(memSz),
HtEnabled: Bool(false),
},
DisableValidation: true,
NetworkInterfaces: networkIfaces,
FifoLogWriter: fw,
}
ctx := context.Background()
cmd := VMCommandBuilder{}.
WithSocketPath(socketPath).
WithBin(getFirecrackerBinaryPath()).
Build(ctx)
m, err := NewMachine(ctx, cfg, WithProcessRunner(cmd), WithLogger(fctesting.NewLogEntry(t)))
if err != nil {
t.Fatalf("failed to create new machine: %v", err)
}
m.Handlers.Validation = m.Handlers.Validation.Clear()
vmmCtx, vmmCancel := context.WithTimeout(ctx, 30*time.Second)
defer vmmCancel()
exitchannel := make(chan error)
go func() {
if err := m.startVMM(vmmCtx); err != nil {
close(exitchannel)
t.Fatalf("Failed to start VMM: %v", err)
}
defer m.StopVMM()
exitchannel <- m.Wait(vmmCtx)
close(exitchannel)
}()
deadlineCtx, deadlineCancel := context.WithTimeout(vmmCtx, 250*time.Millisecond)
defer deadlineCancel()
if err := waitForAliveVMM(deadlineCtx, m.client); err != nil {
t.Fatal(err)
}
t.Run("TestCreateMachine", func(t *testing.T) { testCreateMachine(ctx, t, m) })
t.Run("TestMachineConfigApplication", func(t *testing.T) { testMachineConfigApplication(ctx, t, m, cfg) })
t.Run("TestCreateBootSource", func(t *testing.T) { testCreateBootSource(ctx, t, m, vmlinuxPath) })
t.Run("TestCreateNetworkInterface", func(t *testing.T) { testCreateNetworkInterfaceByID(ctx, t, m) })
t.Run("TestAttachRootDrive", func(t *testing.T) { testAttachRootDrive(ctx, t, m) })
t.Run("TestAttachSecondaryDrive", func(t *testing.T) { testAttachSecondaryDrive(ctx, t, m) })
t.Run("TestAttachVsock", func(t *testing.T) { testAttachVsock(ctx, t, m) })
t.Run("SetMetadata", func(t *testing.T) { testSetMetadata(ctx, t, m) })
t.Run("UpdateMetadata", func(t *testing.T) { testUpdateMetadata(ctx, t, m) })
t.Run("GetMetadata", func(t *testing.T) { testGetMetadata(ctx, t, m) }) // Should be after testSetMetadata and testUpdateMetadata
t.Run("TestStartInstance", func(t *testing.T) { testStartInstance(ctx, t, m) })
// Let the VMM start and stabilize...
timer := time.NewTimer(5 * time.Second)
select {
case <-timer.C:
t.Run("TestUpdateGuestDrive", func(t *testing.T) { testUpdateGuestDrive(ctx, t, m) })
t.Run("TestUpdateGuestNetworkInterface", func(t *testing.T) { testUpdateGuestNetworkInterface(ctx, t, m) })
t.Run("TestShutdown", func(t *testing.T) { testShutdown(ctx, t, m) })
case <-exitchannel:
// if we've already exited, there's no use waiting for the timer
}
// unconditionally stop the VM here. TestShutdown may have triggered a shutdown, but if it
// didn't for some reason, we still need to terminate it:
m.StopVMM()
m.Wait(vmmCtx)
info, err := os.Stat(capturedLog)
assert.NoError(t, err, "failed to stat captured log file")
assert.NotEqual(t, 0, info.Size())
}
func TestStartVMM(t *testing.T) {
socketPath := filepath.Join("testdata", "TestStartVMM.sock")
defer os.Remove(socketPath)
cfg := Config{
SocketPath: socketPath,
}
ctx := context.Background()
cmd := VMCommandBuilder{}.
WithSocketPath(cfg.SocketPath).
WithBin(getFirecrackerBinaryPath()).
Build(ctx)
m, err := NewMachine(ctx, cfg, WithProcessRunner(cmd), WithLogger(fctesting.NewLogEntry(t)))
if err != nil {
t.Fatalf("failed to create new machine: %v", err)
}
m.Handlers.Validation = m.Handlers.Validation.Clear()
timeout, cancel := context.WithTimeout(ctx, 250*time.Millisecond)
defer cancel()
err = m.startVMM(timeout)
if err != nil {
t.Fatalf("startVMM failed: %s", err)
}
defer m.StopVMM()
select {
case <-timeout.Done():
if timeout.Err() == context.DeadlineExceeded {
t.Log("firecracker ran for 250ms")
} else {
t.Errorf("startVMM returned %s", m.Wait(ctx))
}
}
// Make sure exitCh close
_, closed := <-m.exitCh
assert.False(t, closed)
}
func TestLogAndMetrics(t *testing.T) {
tests := []struct {
logLevel string
quiet bool
}{
{logLevel: "", quiet: false},
{logLevel: "Info", quiet: false},
{logLevel: "Error", quiet: true},
}
for _, test := range tests {
t.Run(test.logLevel, func(t *testing.T) {
out := testLogAndMetrics(t, test.logLevel)
if test.quiet {
assert.Regexp(t, `^Running Firecracker v0\.\d+\.0`, out)
return
}
// By default, Firecracker's log level is Warn.
logLevel := "WARN"
if test.logLevel != "" {
logLevel = strings.ToUpper(test.logLevel)
}
assert.Contains(t, out, ":"+logLevel+"]")
})
}
}
func testLogAndMetrics(t *testing.T, logLevel string) string {
const vmID = "UserSuppliedVMID"
dir, err := ioutil.TempDir("", strings.Replace(t.Name(), "/", "_", -1))
require.NoError(t, err)
defer os.RemoveAll(dir)
socketPath := filepath.Join(dir, "fc.sock")
cfg := Config{
VMID: vmID,
SocketPath: socketPath,
DisableValidation: true,
KernelImagePath: getVmlinuxPath(t),
MachineCfg: models.MachineConfiguration{
VcpuCount: Int64(1),
MemSizeMib: Int64(64),
CPUTemplate: models.CPUTemplate(models.CPUTemplateT2),
HtEnabled: Bool(false),
},
MetricsPath: filepath.Join(dir, "fc-metrics.out"),
LogPath: filepath.Join(dir, "fc.log"),
LogLevel: logLevel,
}
ctx := context.Background()
cmd := configureBuilder(VMCommandBuilder{}.WithBin(getFirecrackerBinaryPath()), cfg).Build(ctx)
m, err := NewMachine(ctx, cfg, WithProcessRunner(cmd), WithLogger(fctesting.NewLogEntry(t)))
require.NoError(t, err)
timeout, cancel := context.WithTimeout(ctx, 250*time.Millisecond)
defer cancel()
err = m.Start(timeout)
require.NoError(t, err)
defer m.StopVMM()
select {
case <-timeout.Done():
if timeout.Err() == context.DeadlineExceeded {
t.Log("firecracker ran for 250ms")
t.Run("TestStopVMM", func(t *testing.T) { testStopVMM(ctx, t, m) })
} else {
t.Errorf("startVMM returned %s", m.Wait(ctx))
}
}
metrics, err := os.Stat(cfg.MetricsPath)
require.NoError(t, err)
assert.NotEqual(t, 0, metrics.Size())
log, err := os.Stat(cfg.LogPath)
require.NoError(t, err)
assert.NotEqual(t, 0, log.Size())
content, err := ioutil.ReadFile(cfg.LogPath)
require.NoError(t, err)
return string(content)
}
func TestStartVMMOnce(t *testing.T) {
socketPath := filepath.Join("testdata", "TestStartVMMOnce.sock")
defer os.Remove(socketPath)
cfg := Config{
SocketPath: socketPath,
DisableValidation: true,
KernelImagePath: getVmlinuxPath(t),
MachineCfg: models.MachineConfiguration{
VcpuCount: Int64(1),
MemSizeMib: Int64(64),
CPUTemplate: models.CPUTemplate(models.CPUTemplateT2),
HtEnabled: Bool(false),
},
}
ctx := context.Background()
cmd := VMCommandBuilder{}.
WithSocketPath(cfg.SocketPath).
WithBin(getFirecrackerBinaryPath()).
Build(ctx)
m, err := NewMachine(ctx, cfg, WithProcessRunner(cmd), WithLogger(fctesting.NewLogEntry(t)))
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
timeout, cancel := context.WithTimeout(ctx, 250*time.Millisecond)
defer cancel()
err = m.Start(timeout)
if err != nil {
t.Fatalf("startVMM failed: %s", err)
}
defer m.StopVMM()
err = m.Start(timeout)
assert.Error(t, err, "should return an error when Start is called multiple times")
assert.Equal(t, ErrAlreadyStarted, err, "should be ErrAlreadyStarted")
select {
case <-timeout.Done():
if timeout.Err() == context.DeadlineExceeded {
t.Log("firecracker ran for 250ms")
t.Run("TestStopVMM", func(t *testing.T) { testStopVMM(ctx, t, m) })
} else {
t.Errorf("startVMM returned %s", m.Wait(ctx))
}
}
}
func getFirecrackerBinaryPath() string {
if val := os.Getenv(firecrackerBinaryOverrideEnv); val != "" {
return val
}
return filepath.Join(testDataPath, firecrackerBinaryPath)
}
func getJailerBinaryPath() string {
if val := os.Getenv(jailerBinaryOverrideEnv); val != "" {
return val
}
return filepath.Join(testDataPath, defaultJailerBinary)
}
func getVmlinuxPath(t *testing.T) string {
t.Helper()
vmlinuxPath := filepath.Join(testDataPath, "./vmlinux")
if _, err := os.Stat(vmlinuxPath); err != nil {
t.Fatalf("Cannot find vmlinux file: %s\n"+
`Verify that you have a vmlinux file at "%s" or set the `+
"`%s` environment variable to the correct location.",
err, vmlinuxPath, testDataPathEnv)
}
return vmlinuxPath
}
func testCreateMachine(ctx context.Context, t *testing.T, m *Machine) {
err := m.createMachine(ctx)
if err != nil {
t.Errorf("createMachine said %s", err)
} else {
t.Log("firecracker created a machine")
}
}
func testMachineConfigApplication(ctx context.Context, t *testing.T, m *Machine, expectedValues Config) {
assert.Equal(t, expectedValues.MachineCfg.VcpuCount,
m.machineConfig.VcpuCount, "CPU count should be equal")
assert.Equal(t, expectedValues.MachineCfg.MemSizeMib, m.machineConfig.MemSizeMib, "memory...")
}
func testCreateBootSource(ctx context.Context, t *testing.T, m *Machine, vmlinuxPath string) {
// panic=0: This option disables reboot-on-panic behavior for the kernel. We
// use this option as we might run the tests without a real root
// filesystem available to the guest.
// Kernel command-line options can be found in the kernel source tree at
// Documentation/admin-guide/kernel-parameters.txt.
err := m.createBootSource(ctx, vmlinuxPath, "", "ro console=ttyS0 noapic reboot=k panic=0 pci=off nomodules")
if err != nil {
t.Errorf("failed to create boot source: %s", err)
}
}
func testUpdateGuestDrive(ctx context.Context, t *testing.T, m *Machine) {
path := filepath.Join(testDataPath, "drive-3.img")
if err := m.UpdateGuestDrive(ctx, "2", path); err != nil {
t.Errorf("unexpected error on swapping guest drive: %v", err)
}
}
func testUpdateGuestNetworkInterface(ctx context.Context, t *testing.T, m *Machine) {
rateLimitSet := RateLimiterSet{
InRateLimiter: NewRateLimiter(
TokenBucketBuilder{}.WithBucketSize(10).WithRefillDuration(10).Build(),
TokenBucketBuilder{}.WithBucketSize(10).WithRefillDuration(10).Build(),
),
}
if err := m.UpdateGuestNetworkInterfaceRateLimit(ctx, "1", rateLimitSet); err != nil {
t.Fatalf("Failed to update the network interface %v", err)
}
}
func testCreateNetworkInterfaceByID(ctx context.Context, t *testing.T, m *Machine) {
if skipTuntap {
t.Skip("Skipping: tuntap tests explicitly disabled")
}
hostDevName := getTapName()
iface := NetworkInterface{
StaticConfiguration: &StaticNetworkConfiguration{
MacAddress: "02:00:00:01:02:03",
HostDevName: hostDevName,
},
}
err := m.createNetworkInterface(ctx, iface, 1)
if err != nil {
t.Errorf(`createNetworkInterface: %s
Do you have a tuntap device named %s?
Create one with `+"`sudo ip tuntap add %s mode tap user $UID`", err, hostDevName, hostDevName)
}
}
func getTapName() string {
if val := os.Getenv(tuntapOverrideEnv); val != "" {
return val
}
return defaultTuntapName
}
func testAttachRootDrive(ctx context.Context, t *testing.T, m *Machine) {
drive := models.Drive{
DriveID: String("0"),
IsRootDevice: Bool(true),
IsReadOnly: Bool(true),
PathOnHost: String(testRootfs),
}
err := m.attachDrives(ctx, drive)
if err != nil {
t.Errorf("attaching root drive failed: %s", err)
}
}
func testAttachSecondaryDrive(ctx context.Context, t *testing.T, m *Machine) {
drive := models.Drive{
DriveID: String("2"),
IsRootDevice: Bool(false),
IsReadOnly: Bool(true),
PathOnHost: String(filepath.Join(testDataPath, "drive-2.img")),
}
err := m.attachDrive(ctx, drive)
if err != nil {
t.Errorf("attaching secondary drive failed: %s", err)
}
}
func testAttachVsock(ctx context.Context, t *testing.T, m *Machine) {
timestamp := strconv.Itoa(int(time.Now().UnixNano()))
dev := VsockDevice{
ID: "1",
CID: 3,
Path: timestamp + ".vsock",
}
err := m.addVsock(ctx, dev)
if err != nil {
if badRequest, ok := err.(*operations.PutGuestVsockBadRequest); ok &&
strings.HasPrefix(badRequest.Payload.FaultMessage, "Invalid request method and/or path") {
t.Errorf(`attaching vsock failed: %s
Does your Firecracker binary have vsock support?
Build one with vsock support by running `+"`cargo build --release --features vsock` from within the Firecracker repository.",
badRequest.Payload.FaultMessage)
} else {
t.Errorf("attaching vsock failed: %s", err)
}
}
}
func testStartInstance(ctx context.Context, t *testing.T, m *Machine) {
err := m.startInstance(ctx)
if err != nil {
if syncErr, ok := err.(*operations.CreateSyncActionDefault); ok &&
strings.HasPrefix(syncErr.Payload.FaultMessage, "Cannot create vsock device") {
t.Errorf(`startInstance: %s
Do you have permission to interact with /dev/vhost-vsock?
Grant yourself permission with `+"`sudo setfacl -m u:${USER}:rw /dev/vhost-vsock`", syncErr.Payload.FaultMessage)
} else {
t.Errorf("startInstance failed: %s", err)
}
}
}
func testStopVMM(ctx context.Context, t *testing.T, m *Machine) {
err := m.StopVMM()
if err != nil {
t.Errorf("StopVMM failed: %s", err)
}
}
func testShutdown(ctx context.Context, t *testing.T, m *Machine) {
err := m.Shutdown(ctx)
if err != nil {
t.Errorf("machine.Shutdown() failed: %s", err)
}
}
func TestWaitForSocket(t *testing.T) {
okClient := fctesting.MockClient{}
errClient := fctesting.MockClient{
GetMachineConfigurationFn: func(params *ops.GetMachineConfigurationParams) (*ops.GetMachineConfigurationOK, error) {
return nil, errors.New("http error")
},
}
// testWaitForSocket has three conditions that need testing:
// 1. The expected file is created within the deadline and
// socket HTTP request succeeded
// 2. The expected file is not created within the deadline
// 3. The process responsible for creating the file exits
// (indicated by an error published to exitchan)
filename := "./test-create-file"
errchan := make(chan error)
m := Machine{
Cfg: Config{SocketPath: filename},
logger: fctesting.NewLogEntry(t),
}
go func() {
time.Sleep(50 * time.Millisecond)
_, err := os.Create(filename)
if err != nil {
t.Fatalf("Unable to create test file %s: %s", filename, err)
}
}()
// Socket file created, HTTP request succeeded
m.client = NewClient(filename, fctesting.NewLogEntry(t), true, WithOpsClient(&okClient))
if err := m.waitForSocket(500*time.Millisecond, errchan); err != nil {
t.Errorf("waitForSocket returned unexpected error %s", err)
}
// Socket file exists, HTTP request failed
m.client = NewClient(filename, fctesting.NewLogEntry(t), true, WithOpsClient(&errClient))
if err := m.waitForSocket(500*time.Millisecond, errchan); err != context.DeadlineExceeded {
t.Error("waitforSocket did not return an expected timeout error")
}
os.Remove(filename)
// No socket file
if err := m.waitForSocket(100*time.Millisecond, errchan); err != context.DeadlineExceeded {
t.Error("waitforSocket did not return an expected timeout error")
}
chanErr := errors.New("this is an expected error")
go func() {
time.Sleep(50 * time.Millisecond)
errchan <- chanErr
}()
// Unexpected process exit
if err := m.waitForSocket(100*time.Millisecond, errchan); err != chanErr {
t.Error("waitForSocket did not properly detect program exit")
}
}
func testSetMetadata(ctx context.Context, t *testing.T, m *Machine) {
metadata := map[string]string{"key": "value"}
err := m.SetMetadata(ctx, metadata)
if err != nil {
t.Errorf("failed to set metadata: %s", err)
}
}
func testUpdateMetadata(ctx context.Context, t *testing.T, m *Machine) {
metadata := map[string]string{"patch_key": "patch_value"}
err := m.UpdateMetadata(ctx, metadata)
if err != nil {
t.Errorf("failed to set metadata: %s", err)
}
}
func testGetMetadata(ctx context.Context, t *testing.T, m *Machine) {
metadata := struct {
Key string `json:"key"`
PatchKey string `json:"patch_key"`
}{}
if err := m.GetMetadata(ctx, &metadata); err != nil {
t.Errorf("failed to get metadata: %s", err)
}
if metadata.Key != "value" || metadata.PatchKey != "patch_value" {
t.Error("failed to get expected metadata values")
}
}
func TestLogFiles(t *testing.T) {
cfg := Config{
KernelImagePath: filepath.Join(testDataPath, "vmlinux"), SocketPath: filepath.Join(testDataPath, "socket-path"),
Drives: []models.Drive{
{
DriveID: String("0"),
IsRootDevice: Bool(true),
IsReadOnly: Bool(false),
PathOnHost: String(testRootfs),
},
},
DisableValidation: true,
}
opClient := fctesting.MockClient{
GetMachineConfigurationFn: func(params *ops.GetMachineConfigurationParams) (*ops.GetMachineConfigurationOK, error) {
return &ops.GetMachineConfigurationOK{
Payload: &models.MachineConfiguration{},
}, nil
},
}
ctx := context.Background()
client := NewClient("socket-path", fctesting.NewLogEntry(t), true, WithOpsClient(&opClient))
stdoutPath := filepath.Join(testDataPath, "stdout.log")
stderrPath := filepath.Join(testDataPath, "stderr.log")
stdout, err := os.Create(stdoutPath)
if err != nil {
t.Fatalf("error creating %q: %v", stdoutPath, err)
}
stderr, err := os.Create(stderrPath)
if err != nil {
t.Fatalf("error creating %q: %v", stderrPath, err)
}
fd, err := net.Listen("unix", cfg.SocketPath)
if err != nil {
t.Fatalf("unexpected error during creation of unix socket: %v", err)
}
defer func() {
fd.Close()
}()
defer func() {
os.Remove(stdoutPath)
os.Remove(stderrPath)
}()
cmd := exec.Command("ls")
cmd.Stdout = stdout
cmd.Stderr = stderr
m, err := NewMachine(
ctx,
cfg,
WithClient(client),
WithProcessRunner(cmd),
WithLogger(fctesting.NewLogEntry(t)),
)
if err != nil {
t.Fatalf("failed to create new machine: %v", err)
}
defer m.StopVMM()
if err := m.Handlers.FcInit.Run(ctx, m); err != nil {
t.Fatalf("unexpected error: %v", err)
}
if _, err := os.Stat(stdoutPath); os.IsNotExist(err) {
t.Errorf("expected log file to be present")
}
if _, err := os.Stat(stderrPath); os.IsNotExist(err) {
t.Errorf("expected log file to be present")
}
}
func TestCaptureFifoToFile(t *testing.T) {
fifoPath := filepath.Join(testDataPath, "TestCaptureFifoToFile")
if err := syscall.Mkfifo(fifoPath, 0700); err != nil {
t.Fatalf("Unexpected error during syscall.Mkfifo call: %v", err)
}
defer os.Remove(fifoPath)
f, err := os.OpenFile(fifoPath, os.O_RDWR, 0600)
if err != nil {
t.Fatalf("Failed to open file, %q: %v", fifoPath, err)
}
expectedBytes := []byte("Hello world!")
f.Write(expectedBytes)
defer f.Close()
time.AfterFunc(250*time.Millisecond, func() { f.Close() })
logPath := fifoPath + ".log"
logFile, err := os.OpenFile(logPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
t.Fatalf("Failed to create log file: %v", err)
}
var wg sync.WaitGroup
wg.Add(1)
testWriter := &fctesting.TestWriter{
WriteFn: func(b []byte) (int, error) {
defer wg.Done()
return logFile.Write(b)
},
}
m := &Machine{
exitCh: make(chan struct{}),
}
if err := m.captureFifoToFile(context.Background(), fctesting.NewLogEntry(t), fifoPath, testWriter); err != nil {
t.Errorf("Unexpected error: %v", err)
}
defer os.Remove(logPath)
wg.Wait()
_, err = os.Stat(logPath)
assert.NoError(t, err, "failed to stat file")
b, err := ioutil.ReadFile(logPath)
assert.NoError(t, err, "failed to read logPath")
assert.Equal(t, expectedBytes, b)
}
func TestCaptureFifoToFile_nonblock(t *testing.T) {
fifoPath := filepath.Join(testDataPath, "TestCaptureFifoToFile_nonblock")
if err := syscall.Mkfifo(fifoPath, 0700); err != nil {
t.Fatalf("Unexpected error during syscall.Mkfifo call: %v", err)
}
defer os.Remove(fifoPath)
logPath := fifoPath + ".log"
logFile, err := os.OpenFile(logPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644)
if err != nil {
t.Fatalf("Failed to create log file: %v", err)
}
var wg sync.WaitGroup
wg.Add(1)
testWriter := &fctesting.TestWriter{
WriteFn: func(b []byte) (int, error) {
defer wg.Done()
return logFile.Write(b)
},
}
m := &Machine{
exitCh: make(chan struct{}),
}
if err := m.captureFifoToFile(context.Background(), fctesting.NewLogEntry(t), fifoPath, testWriter); err != nil {
t.Errorf("Unexpected error: %v", err)
}
defer os.Remove(logPath)
// we sleep here to check to see the io.Copy is working properly in
// captureFifoToFile. This is due to the fifo being opened with O_NONBLOCK,
// which causes io.Copy to exit immediately with no error.
//
// https://github.com/firecracker-microvm/firecracker-go-sdk/issues/156
time.Sleep(250 * time.Millisecond)
f, err := os.OpenFile(fifoPath, os.O_RDWR, 0600)
if err != nil {
t.Fatalf("Failed to open file, %q: %v", fifoPath, err)
}
expectedBytes := []byte("Hello world!")
f.Write(expectedBytes)
defer f.Close()
time.AfterFunc(250*time.Millisecond, func() { f.Close() })