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moby--moby/integration-cli/daemon.go

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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/docker/docker/api/types/events"
"github.com/docker/docker/opts"
"github.com/docker/docker/pkg/integration/checker"
"github.com/docker/docker/pkg/ioutils"
"github.com/docker/docker/pkg/stringid"
"github.com/docker/go-connections/sockets"
"github.com/docker/go-connections/tlsconfig"
"github.com/go-check/check"
)
var daemonSockRoot = filepath.Join(os.TempDir(), "docker-integration")
// Daemon represents a Docker daemon for the testing framework.
type Daemon struct {
GlobalFlags []string
id string
c *check.C
logFile *os.File
folder string
root string
stdin io.WriteCloser
stdout, stderr io.ReadCloser
cmd *exec.Cmd
storageDriver string
wait chan error
userlandProxy bool
useDefaultHost bool
useDefaultTLSHost bool
execRoot string
}
type clientConfig struct {
transport *http.Transport
scheme string
addr string
}
// NewDaemon returns a Daemon instance to be used for testing.
// This will create a directory such as d123456789 in the folder specified by $DEST.
// The daemon will not automatically start.
func NewDaemon(c *check.C) *Daemon {
dest := os.Getenv("DEST")
c.Assert(dest, check.Not(check.Equals), "", check.Commentf("Please set the DEST environment variable"))
err := os.MkdirAll(daemonSockRoot, 0700)
c.Assert(err, checker.IsNil, check.Commentf("could not create daemon socket root"))
id := fmt.Sprintf("d%s", stringid.TruncateID(stringid.GenerateRandomID()))
dir := filepath.Join(dest, id)
daemonFolder, err := filepath.Abs(dir)
c.Assert(err, check.IsNil, check.Commentf("Could not make %q an absolute path", dir))
daemonRoot := filepath.Join(daemonFolder, "root")
c.Assert(os.MkdirAll(daemonRoot, 0755), check.IsNil, check.Commentf("Could not create daemon root %q", dir))
userlandProxy := true
if env := os.Getenv("DOCKER_USERLANDPROXY"); env != "" {
if val, err := strconv.ParseBool(env); err != nil {
userlandProxy = val
}
}
return &Daemon{
id: id,
c: c,
folder: daemonFolder,
root: daemonRoot,
storageDriver: os.Getenv("DOCKER_GRAPHDRIVER"),
userlandProxy: userlandProxy,
execRoot: filepath.Join(os.TempDir(), "docker-execroot", id),
}
}
func (d *Daemon) getClientConfig() (*clientConfig, error) {
var (
transport *http.Transport
scheme string
addr string
proto string
)
if d.useDefaultTLSHost {
option := &tlsconfig.Options{
CAFile: "fixtures/https/ca.pem",
CertFile: "fixtures/https/client-cert.pem",
KeyFile: "fixtures/https/client-key.pem",
}
tlsConfig, err := tlsconfig.Client(*option)
if err != nil {
return nil, err
}
transport = &http.Transport{
TLSClientConfig: tlsConfig,
}
addr = fmt.Sprintf("%s:%d", opts.DefaultHTTPHost, opts.DefaultTLSHTTPPort)
scheme = "https"
proto = "tcp"
} else if d.useDefaultHost {
addr = opts.DefaultUnixSocket
proto = "unix"
scheme = "http"
transport = &http.Transport{}
} else {
addr = d.sockPath()
proto = "unix"
scheme = "http"
transport = &http.Transport{}
}
d.c.Assert(sockets.ConfigureTransport(transport, proto, addr), check.IsNil)
return &clientConfig{
transport: transport,
scheme: scheme,
addr: addr,
}, nil
}
// Start will start the daemon and return once it is ready to receive requests.
// You can specify additional daemon flags.
func (d *Daemon) Start(args ...string) error {
logFile, err := os.OpenFile(filepath.Join(d.folder, "docker.log"), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0600)
d.c.Assert(err, check.IsNil, check.Commentf("[%s] Could not create %s/docker.log", d.id, d.folder))
return d.StartWithLogFile(logFile, args...)
}
// StartWithLogFile will start the daemon and attach its streams to a given file.
func (d *Daemon) StartWithLogFile(out *os.File, providedArgs ...string) error {
dockerdBinary, err := exec.LookPath(dockerdBinary)
d.c.Assert(err, check.IsNil, check.Commentf("[%s] could not find docker binary in $PATH", d.id))
args := append(d.GlobalFlags,
"--containerd", "/var/run/docker/libcontainerd/docker-containerd.sock",
"--graph", d.root,
"--exec-root", d.execRoot,
"--pidfile", fmt.Sprintf("%s/docker.pid", d.folder),
fmt.Sprintf("--userland-proxy=%t", d.userlandProxy),
)
if experimentalDaemon {
args = append(args, "--experimental")
}
if !(d.useDefaultHost || d.useDefaultTLSHost) {
args = append(args, []string{"--host", d.sock()}...)
}
if root := os.Getenv("DOCKER_REMAP_ROOT"); root != "" {
args = append(args, []string{"--userns-remap", root}...)
}
// If we don't explicitly set the log-level or debug flag(-D) then
// turn on debug mode
foundLog := false
foundSd := false
for _, a := range providedArgs {
if strings.Contains(a, "--log-level") || strings.Contains(a, "-D") || strings.Contains(a, "--debug") {
foundLog = true
}
if strings.Contains(a, "--storage-driver") {
foundSd = true
}
}
if !foundLog {
args = append(args, "--debug")
}
if d.storageDriver != "" && !foundSd {
args = append(args, "--storage-driver", d.storageDriver)
}
args = append(args, providedArgs...)
d.cmd = exec.Command(dockerdBinary, args...)
d.cmd.Env = append(os.Environ(), "DOCKER_SERVICE_PREFER_OFFLINE_IMAGE=1")
d.cmd.Stdout = out
d.cmd.Stderr = out
d.logFile = out
if err := d.cmd.Start(); err != nil {
return fmt.Errorf("[%s] could not start daemon container: %v", d.id, err)
}
wait := make(chan error)
go func() {
wait <- d.cmd.Wait()
d.c.Logf("[%s] exiting daemon", d.id)
close(wait)
}()
d.wait = wait
tick := time.Tick(500 * time.Millisecond)
// make sure daemon is ready to receive requests
startTime := time.Now().Unix()
for {
d.c.Logf("[%s] waiting for daemon to start", d.id)
if time.Now().Unix()-startTime > 5 {
// After 5 seconds, give up
return fmt.Errorf("[%s] Daemon exited and never started", d.id)
}
select {
case <-time.After(2 * time.Second):
return fmt.Errorf("[%s] timeout: daemon does not respond", d.id)
case <-tick:
clientConfig, err := d.getClientConfig()
if err != nil {
return err
}
client := &http.Client{
Transport: clientConfig.transport,
}
req, err := http.NewRequest("GET", "/_ping", nil)
d.c.Assert(err, check.IsNil, check.Commentf("[%s] could not create new request", d.id))
req.URL.Host = clientConfig.addr
req.URL.Scheme = clientConfig.scheme
resp, err := client.Do(req)
if err != nil {
continue
}
if resp.StatusCode != http.StatusOK {
d.c.Logf("[%s] received status != 200 OK: %s", d.id, resp.Status)
}
d.c.Logf("[%s] daemon started", d.id)
d.root, err = d.queryRootDir()
if err != nil {
return fmt.Errorf("[%s] error querying daemon for root directory: %v", d.id, err)
}
return nil
case <-d.wait:
return fmt.Errorf("[%s] Daemon exited during startup", d.id)
}
}
}
// StartWithBusybox will first start the daemon with Daemon.Start()
// then save the busybox image from the main daemon and load it into this Daemon instance.
func (d *Daemon) StartWithBusybox(arg ...string) error {
if err := d.Start(arg...); err != nil {
return err
}
return d.LoadBusybox()
}
// Kill will send a SIGKILL to the daemon
func (d *Daemon) Kill() error {
if d.cmd == nil || d.wait == nil {
return errors.New("daemon not started")
}
defer func() {
d.logFile.Close()
d.cmd = nil
}()
if err := d.cmd.Process.Kill(); err != nil {
d.c.Logf("Could not kill daemon: %v", err)
return err
}
if err := os.Remove(fmt.Sprintf("%s/docker.pid", d.folder)); err != nil {
return err
}
return nil
}
// DumpStackAndQuit sends SIGQUIT to the daemon, which triggers it to dump its
// stack to its log file and exit
// This is used primarily for gathering debug information on test timeout
func (d *Daemon) DumpStackAndQuit() {
if d.cmd == nil || d.cmd.Process == nil {
return
}
signalDaemonDump(d.cmd.Process.Pid)
}
// Stop will send a SIGINT every second and wait for the daemon to stop.
// If it timeouts, a SIGKILL is sent.
// Stop will not delete the daemon directory. If a purged daemon is needed,
// instantiate a new one with NewDaemon.
func (d *Daemon) Stop() error {
if d.cmd == nil || d.wait == nil {
return errors.New("daemon not started")
}
defer func() {
d.logFile.Close()
d.cmd = nil
}()
i := 1
tick := time.Tick(time.Second)
if err := d.cmd.Process.Signal(os.Interrupt); err != nil {
return fmt.Errorf("could not send signal: %v", err)
}
out1:
for {
select {
case err := <-d.wait:
return err
case <-time.After(20 * time.Second):
// time for stopping jobs and run onShutdown hooks
d.c.Logf("timeout: %v", d.id)
break out1
}
}
out2:
for {
select {
case err := <-d.wait:
return err
case <-tick:
i++
if i > 5 {
d.c.Logf("tried to interrupt daemon for %d times, now try to kill it", i)
break out2
}
d.c.Logf("Attempt #%d: daemon is still running with pid %d", i, d.cmd.Process.Pid)
if err := d.cmd.Process.Signal(os.Interrupt); err != nil {
return fmt.Errorf("could not send signal: %v", err)
}
}
}
if err := d.cmd.Process.Kill(); err != nil {
d.c.Logf("Could not kill daemon: %v", err)
return err
}
if err := os.Remove(fmt.Sprintf("%s/docker.pid", d.folder)); err != nil {
return err
}
return nil
}
// Restart will restart the daemon by first stopping it and then starting it.
func (d *Daemon) Restart(arg ...string) error {
d.Stop()
// in the case of tests running a user namespace-enabled daemon, we have resolved
// d.root to be the actual final path of the graph dir after the "uid.gid" of
// remapped root is added--we need to subtract it from the path before calling
// start or else we will continue making subdirectories rather than truly restarting
// with the same location/root:
if root := os.Getenv("DOCKER_REMAP_ROOT"); root != "" {
d.root = filepath.Dir(d.root)
}
return d.Start(arg...)
}
// LoadBusybox will load the stored busybox into a newly started daemon
func (d *Daemon) LoadBusybox() error {
bb := filepath.Join(d.folder, "busybox.tar")
if _, err := os.Stat(bb); err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("unexpected error on busybox.tar stat: %v", err)
}
// saving busybox image from main daemon
if out, err := exec.Command(dockerBinary, "save", "--output", bb, "busybox:latest").CombinedOutput(); err != nil {
imagesOut, _ := exec.Command(dockerBinary, "images", "--format", "{{ .Repository }}:{{ .Tag }}").CombinedOutput()
return fmt.Errorf("could not save busybox image: %s\n%s", string(out), strings.TrimSpace(string(imagesOut)))
}
}
// loading busybox image to this daemon
if out, err := d.Cmd("load", "--input", bb); err != nil {
return fmt.Errorf("could not load busybox image: %s", out)
}
if err := os.Remove(bb); err != nil {
d.c.Logf("could not remove %s: %v", bb, err)
}
return nil
}
func (d *Daemon) queryRootDir() (string, error) {
// update daemon root by asking /info endpoint (to support user
// namespaced daemon with root remapped uid.gid directory)
clientConfig, err := d.getClientConfig()
if err != nil {
return "", err
}
client := &http.Client{
Transport: clientConfig.transport,
}
req, err := http.NewRequest("GET", "/info", nil)
if err != nil {
return "", err
}
req.Header.Set("Content-Type", "application/json")
req.URL.Host = clientConfig.addr
req.URL.Scheme = clientConfig.scheme
resp, err := client.Do(req)
if err != nil {
return "", err
}
body := ioutils.NewReadCloserWrapper(resp.Body, func() error {
return resp.Body.Close()
})
type Info struct {
DockerRootDir string
}
var b []byte
var i Info
b, err = readBody(body)
if err == nil && resp.StatusCode == http.StatusOK {
// read the docker root dir
if err = json.Unmarshal(b, &i); err == nil {
return i.DockerRootDir, nil
}
}
return "", err
}
func (d *Daemon) sock() string {
return fmt.Sprintf("unix://" + d.sockPath())
}
func (d *Daemon) sockPath() string {
return filepath.Join(daemonSockRoot, d.id+".sock")
}
func (d *Daemon) waitRun(contID string) error {
args := []string{"--host", d.sock()}
return waitInspectWithArgs(contID, "{{.State.Running}}", "true", 10*time.Second, args...)
}
func (d *Daemon) getBaseDeviceSize(c *check.C) int64 {
infoCmdOutput, _, err := runCommandPipelineWithOutput(
exec.Command(dockerBinary, "-H", d.sock(), "info"),
exec.Command("grep", "Base Device Size"),
)
c.Assert(err, checker.IsNil)
basesizeSlice := strings.Split(infoCmdOutput, ":")
basesize := strings.Trim(basesizeSlice[1], " ")
basesize = strings.Trim(basesize, "\n")[:len(basesize)-3]
basesizeFloat, err := strconv.ParseFloat(strings.Trim(basesize, " "), 64)
c.Assert(err, checker.IsNil)
basesizeBytes := int64(basesizeFloat) * (1024 * 1024 * 1024)
return basesizeBytes
}
// Cmd will execute a docker CLI command against this Daemon.
// Example: d.Cmd("version") will run docker -H unix://path/to/unix.sock version
func (d *Daemon) Cmd(args ...string) (string, error) {
c := exec.Command(dockerBinary, d.prependHostArg(args)...)
b, err := c.CombinedOutput()
return string(b), err
}
func (d *Daemon) prependHostArg(args []string) []string {
for _, arg := range args {
if arg == "--host" || arg == "-H" {
return args
}
}
return append([]string{"--host", d.sock()}, args...)
}
// SockRequest executes a socket request on a daemon and returns statuscode and output.
func (d *Daemon) SockRequest(method, endpoint string, data interface{}) (int, []byte, error) {
jsonData := bytes.NewBuffer(nil)
if err := json.NewEncoder(jsonData).Encode(data); err != nil {
return -1, nil, err
}
res, body, err := d.SockRequestRaw(method, endpoint, jsonData, "application/json")
if err != nil {
return -1, nil, err
}
b, err := readBody(body)
return res.StatusCode, b, err
}
// SockRequestRaw executes a socket request on a daemon and returns a http
// response and a reader for the output data.
func (d *Daemon) SockRequestRaw(method, endpoint string, data io.Reader, ct string) (*http.Response, io.ReadCloser, error) {
return sockRequestRawToDaemon(method, endpoint, data, ct, d.sock())
}
// LogFileName returns the path the the daemon's log file
func (d *Daemon) LogFileName() string {
return d.logFile.Name()
}
func (d *Daemon) getIDByName(name string) (string, error) {
return d.inspectFieldWithError(name, "Id")
}
func (d *Daemon) activeContainers() (ids []string) {
out, _ := d.Cmd("ps", "-q")
for _, id := range strings.Split(out, "\n") {
if id = strings.TrimSpace(id); id != "" {
ids = append(ids, id)
}
}
return
}
func (d *Daemon) inspectFilter(name, filter string) (string, error) {
format := fmt.Sprintf("{{%s}}", filter)
out, err := d.Cmd("inspect", "-f", format, name)
if err != nil {
return "", fmt.Errorf("failed to inspect %s: %s", name, out)
}
return strings.TrimSpace(out), nil
}
func (d *Daemon) inspectFieldWithError(name, field string) (string, error) {
return d.inspectFilter(name, fmt.Sprintf(".%s", field))
}
func (d *Daemon) findContainerIP(id string) string {
out, err := d.Cmd("inspect", fmt.Sprintf("--format='{{ .NetworkSettings.Networks.bridge.IPAddress }}'"), id)
if err != nil {
d.c.Log(err)
}
return strings.Trim(out, " \r\n'")
}
func (d *Daemon) buildImageWithOut(name, dockerfile string, useCache bool, buildFlags ...string) (string, int, error) {
buildCmd := buildImageCmdWithHost(name, dockerfile, d.sock(), useCache, buildFlags...)
return runCommandWithOutput(buildCmd)
}
func (d *Daemon) checkActiveContainerCount(c *check.C) (interface{}, check.CommentInterface) {
out, err := d.Cmd("ps", "-q")
c.Assert(err, checker.IsNil)
if len(strings.TrimSpace(out)) == 0 {
return 0, nil
}
return len(strings.Split(strings.TrimSpace(out), "\n")), check.Commentf("output: %q", string(out))
}
func (d *Daemon) reloadConfig() error {
if d.cmd == nil || d.cmd.Process == nil {
return fmt.Errorf("daemon is not running")
}
errCh := make(chan error)
started := make(chan struct{})
go func() {
_, body, err := sockRequestRawToDaemon("GET", "/events", nil, "", d.sock())
close(started)
if err != nil {
errCh <- err
}
defer body.Close()
dec := json.NewDecoder(body)
for {
var e events.Message
if err := dec.Decode(&e); err != nil {
errCh <- err
return
}
if e.Type != events.DaemonEventType {
continue
}
if e.Action != "reload" {
continue
}
close(errCh) // notify that we are done
return
}
}()
<-started
if err := signalDaemonReload(d.cmd.Process.Pid); err != nil {
return fmt.Errorf("error signaling daemon reload: %v", err)
}
select {
case err := <-errCh:
if err != nil {
return fmt.Errorf("error waiting for daemon reload event: %v", err)
}
case <-time.After(30 * time.Second):
return fmt.Errorf("timeout waiting for daemon reload event")
}
return nil
}