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// +build !test_no_exec
package main
import (
"bufio"
"fmt"
"os"
"os/exec"
"path/filepath"
"reflect"
"sort"
"strings"
"sync"
"time"
"github.com/go-check/check"
)
func (s *DockerSuite) TestExec(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "testing", "busybox", "sh", "-c", "echo test > /tmp/file && top")
if out, _, _, err := runCommandWithStdoutStderr(runCmd); err != nil {
c.Fatal(out, err)
}
execCmd := exec.Command(dockerBinary, "exec", "testing", "cat", "/tmp/file")
out, _, err := runCommandWithOutput(execCmd)
if err != nil {
c.Fatal(out, err)
}
out = strings.Trim(out, "\r\n")
if expected := "test"; out != expected {
c.Errorf("container exec should've printed %q but printed %q", expected, out)
}
}
func (s *DockerSuite) TestExecInteractive(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "testing", "busybox", "sh", "-c", "echo test > /tmp/file && top")
if out, _, _, err := runCommandWithStdoutStderr(runCmd); err != nil {
c.Fatal(out, err)
}
execCmd := exec.Command(dockerBinary, "exec", "-i", "testing", "sh")
stdin, err := execCmd.StdinPipe()
if err != nil {
c.Fatal(err)
}
stdout, err := execCmd.StdoutPipe()
if err != nil {
c.Fatal(err)
}
if err := execCmd.Start(); err != nil {
c.Fatal(err)
}
if _, err := stdin.Write([]byte("cat /tmp/file\n")); err != nil {
c.Fatal(err)
}
r := bufio.NewReader(stdout)
line, err := r.ReadString('\n')
if err != nil {
c.Fatal(err)
}
line = strings.TrimSpace(line)
if line != "test" {
c.Fatalf("Output should be 'test', got '%q'", line)
}
if err := stdin.Close(); err != nil {
c.Fatal(err)
}
errChan := make(chan error)
go func() {
errChan <- execCmd.Wait()
close(errChan)
}()
select {
case err := <-errChan:
c.Assert(err, check.IsNil)
case <-time.After(1 * time.Second):
c.Fatal("docker exec failed to exit on stdin close")
}
}
func (s *DockerSuite) TestExecAfterContainerRestart(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
out, _, err := runCommandWithOutput(runCmd)
if err != nil {
c.Fatal(out, err)
}
cleanedContainerID := strings.TrimSpace(out)
runCmd = exec.Command(dockerBinary, "restart", cleanedContainerID)
if out, _, err = runCommandWithOutput(runCmd); err != nil {
c.Fatal(out, err)
}
runCmd = exec.Command(dockerBinary, "exec", cleanedContainerID, "echo", "hello")
out, _, err = runCommandWithOutput(runCmd)
if err != nil {
c.Fatal(out, err)
}
outStr := strings.TrimSpace(out)
if outStr != "hello" {
c.Errorf("container should've printed hello, instead printed %q", outStr)
}
}
func (s *DockerDaemonSuite) TestExecAfterDaemonRestart(c *check.C) {
testRequires(c, SameHostDaemon)
if err := s.d.StartWithBusybox(); err != nil {
c.Fatalf("Could not start daemon with busybox: %v", err)
}
if out, err := s.d.Cmd("run", "-d", "--name", "top", "-p", "80", "busybox:latest", "top"); err != nil {
c.Fatalf("Could not run top: err=%v\n%s", err, out)
}
if err := s.d.Restart(); err != nil {
c.Fatalf("Could not restart daemon: %v", err)
}
if out, err := s.d.Cmd("start", "top"); err != nil {
c.Fatalf("Could not start top after daemon restart: err=%v\n%s", err, out)
}
out, err := s.d.Cmd("exec", "top", "echo", "hello")
if err != nil {
c.Fatalf("Could not exec on container top: err=%v\n%s", err, out)
}
outStr := strings.TrimSpace(string(out))
if outStr != "hello" {
c.Errorf("container should've printed hello, instead printed %q", outStr)
}
}
// Regression test for #9155, #9044
func (s *DockerSuite) TestExecEnv(c *check.C) {
runCmd := exec.Command(dockerBinary, "run",
"-e", "LALA=value1",
"-e", "LALA=value2",
"-d", "--name", "testing", "busybox", "top")
if out, _, _, err := runCommandWithStdoutStderr(runCmd); err != nil {
c.Fatal(out, err)
}
execCmd := exec.Command(dockerBinary, "exec", "testing", "env")
out, _, err := runCommandWithOutput(execCmd)
if err != nil {
c.Fatal(out, err)
}
if strings.Contains(out, "LALA=value1") ||
!strings.Contains(out, "LALA=value2") ||
!strings.Contains(out, "HOME=/root") {
c.Errorf("exec env(%q), expect %q, %q", out, "LALA=value2", "HOME=/root")
}
}
func (s *DockerSuite) TestExecExitStatus(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "top", "busybox", "top")
if out, _, _, err := runCommandWithStdoutStderr(runCmd); err != nil {
c.Fatal(out, err)
}
// Test normal (non-detached) case first
cmd := exec.Command(dockerBinary, "exec", "top", "sh", "-c", "exit 23")
ec, _ := runCommand(cmd)
if ec != 23 {
c.Fatalf("Should have had an ExitCode of 23, not: %d", ec)
}
}
func (s *DockerSuite) TestExecPausedContainer(c *check.C) {
defer unpauseAllContainers()
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "testing", "busybox", "top")
out, _, err := runCommandWithOutput(runCmd)
if err != nil {
c.Fatal(out, err)
}
ContainerID := strings.TrimSpace(out)
pausedCmd := exec.Command(dockerBinary, "pause", "testing")
out, _, _, err = runCommandWithStdoutStderr(pausedCmd)
if err != nil {
c.Fatal(out, err)
}
execCmd := exec.Command(dockerBinary, "exec", "-i", "-t", ContainerID, "echo", "hello")
out, _, err = runCommandWithOutput(execCmd)
if err == nil {
c.Fatal("container should fail to exec new command if it is paused")
}
expected := ContainerID + " is paused, unpause the container before exec"
if !strings.Contains(out, expected) {
c.Fatal("container should not exec new command if it is paused")
}
}
// regression test for #9476
func (s *DockerSuite) TestExecTtyCloseStdin(c *check.C) {
cmd := exec.Command(dockerBinary, "run", "-d", "-it", "--name", "exec_tty_stdin", "busybox")
if out, _, err := runCommandWithOutput(cmd); err != nil {
c.Fatal(out, err)
}
cmd = exec.Command(dockerBinary, "exec", "-i", "exec_tty_stdin", "cat")
stdinRw, err := cmd.StdinPipe()
if err != nil {
c.Fatal(err)
}
stdinRw.Write([]byte("test"))
stdinRw.Close()
if out, _, err := runCommandWithOutput(cmd); err != nil {
c.Fatal(out, err)
}
cmd = exec.Command(dockerBinary, "top", "exec_tty_stdin")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
c.Fatal(out, err)
}
outArr := strings.Split(out, "\n")
if len(outArr) > 3 || strings.Contains(out, "nsenter-exec") {
// This is the really bad part
if out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "rm", "-f", "exec_tty_stdin")); err != nil {
c.Fatal(out, err)
}
c.Fatalf("exec process left running\n\t %s", out)
}
}
func (s *DockerSuite) TestExecTtyWithoutStdin(c *check.C) {
cmd := exec.Command(dockerBinary, "run", "-d", "-ti", "busybox")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
c.Fatalf("failed to start container: %v (%v)", out, err)
}
id := strings.TrimSpace(out)
if err := waitRun(id); err != nil {
c.Fatal(err)
}
defer func() {
cmd := exec.Command(dockerBinary, "kill", id)
if out, _, err := runCommandWithOutput(cmd); err != nil {
c.Fatalf("failed to kill container: %v (%v)", out, err)
}
}()
errChan := make(chan error)
go func() {
defer close(errChan)
cmd := exec.Command(dockerBinary, "exec", "-ti", id, "true")
if _, err := cmd.StdinPipe(); err != nil {
errChan <- err
return
}
expected := "cannot enable tty mode"
if out, _, err := runCommandWithOutput(cmd); err == nil {
errChan <- fmt.Errorf("exec should have failed")
return
} else if !strings.Contains(out, expected) {
errChan <- fmt.Errorf("exec failed with error %q: expected %q", out, expected)
return
}
}()
select {
case err := <-errChan:
c.Assert(err, check.IsNil)
case <-time.After(3 * time.Second):
c.Fatal("exec is running but should have failed")
}
}
func (s *DockerSuite) TestExecParseError(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "top", "busybox", "top")
if out, _, err := runCommandWithOutput(runCmd); err != nil {
c.Fatal(out, err)
}
// Test normal (non-detached) case first
cmd := exec.Command(dockerBinary, "exec", "top")
if _, stderr, code, err := runCommandWithStdoutStderr(cmd); err == nil || !strings.Contains(stderr, "See '"+dockerBinary+" exec --help'") || code == 0 {
c.Fatalf("Should have thrown error & point to help: %s", stderr)
}
}
func (s *DockerSuite) TestExecStopNotHanging(c *check.C) {
if out, err := exec.Command(dockerBinary, "run", "-d", "--name", "testing", "busybox", "top").CombinedOutput(); err != nil {
c.Fatal(out, err)
}
if err := exec.Command(dockerBinary, "exec", "testing", "top").Start(); err != nil {
c.Fatal(err)
}
type dstop struct {
out []byte
err error
}
ch := make(chan dstop)
go func() {
out, err := exec.Command(dockerBinary, "stop", "testing").CombinedOutput()
ch <- dstop{out, err}
close(ch)
}()
select {
case <-time.After(3 * time.Second):
c.Fatal("Container stop timed out")
case s := <-ch:
c.Assert(s.err, check.IsNil)
}
}
func (s *DockerSuite) TestExecCgroup(c *check.C) {
var cmd *exec.Cmd
cmd = exec.Command(dockerBinary, "run", "-d", "--name", "testing", "busybox", "top")
_, err := runCommand(cmd)
if err != nil {
c.Fatal(err)
}
cmd = exec.Command(dockerBinary, "exec", "testing", "cat", "/proc/1/cgroup")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
c.Fatal(out, err)
}
containerCgroups := sort.StringSlice(strings.Split(string(out), "\n"))
var wg sync.WaitGroup
var mu sync.Mutex
execCgroups := []sort.StringSlice{}
errChan := make(chan error)
// exec a few times concurrently to get consistent failure
for i := 0; i < 5; i++ {
wg.Add(1)
go func() {
cmd := exec.Command(dockerBinary, "exec", "testing", "cat", "/proc/self/cgroup")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
errChan <- err
return
}
cg := sort.StringSlice(strings.Split(string(out), "\n"))
mu.Lock()
execCgroups = append(execCgroups, cg)
mu.Unlock()
wg.Done()
}()
}
wg.Wait()
close(errChan)
for err := range errChan {
c.Assert(err, check.IsNil)
}
for _, cg := range execCgroups {
if !reflect.DeepEqual(cg, containerCgroups) {
fmt.Println("exec cgroups:")
for _, name := range cg {
fmt.Printf(" %s\n", name)
}
fmt.Println("container cgroups:")
for _, name := range containerCgroups {
fmt.Printf(" %s\n", name)
}
c.Fatal("cgroups mismatched")
}
}
}
func (s *DockerSuite) TestInspectExecID(c *check.C) {
out, exitCode, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "busybox", "top"))
if exitCode != 0 || err != nil {
c.Fatalf("failed to run container: %s, %v", out, err)
}
id := strings.TrimSuffix(out, "\n")
out, err = inspectField(id, "ExecIDs")
if err != nil {
c.Fatalf("failed to inspect container: %s, %v", out, err)
}
if out != "[]" {
c.Fatalf("ExecIDs should be empty, got: %s", out)
}
exitCode, err = runCommand(exec.Command(dockerBinary, "exec", "-d", id, "ls", "/"))
if exitCode != 0 || err != nil {
c.Fatalf("failed to exec in container: %s, %v", out, err)
}
out, err = inspectField(id, "ExecIDs")
if err != nil {
c.Fatalf("failed to inspect container: %s, %v", out, err)
}
out = strings.TrimSuffix(out, "\n")
if out == "[]" || out == "<no value>" {
c.Fatalf("ExecIDs should not be empty, got: %s", out)
}
}
func (s *DockerSuite) TestLinksPingLinkedContainersOnRename(c *check.C) {
var out string
out, _ = dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
idA := strings.TrimSpace(out)
if idA == "" {
c.Fatal(out, "id should not be nil")
}
out, _ = dockerCmd(c, "run", "-d", "--link", "container1:alias1", "--name", "container2", "busybox", "top")
idB := strings.TrimSpace(out)
if idB == "" {
c.Fatal(out, "id should not be nil")
}
execCmd := exec.Command(dockerBinary, "exec", "container2", "ping", "-c", "1", "alias1", "-W", "1")
out, _, err := runCommandWithOutput(execCmd)
if err != nil {
c.Fatal(out, err)
}
dockerCmd(c, "rename", "container1", "container_new")
execCmd = exec.Command(dockerBinary, "exec", "container2", "ping", "-c", "1", "alias1", "-W", "1")
out, _, err = runCommandWithOutput(execCmd)
if err != nil {
c.Fatal(out, err)
}
}
func (s *DockerSuite) TestRunExecDir(c *check.C) {
testRequires(c, SameHostDaemon)
cmd := exec.Command(dockerBinary, "run", "-d", "busybox", "top")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
c.Fatal(err, out)
}
id := strings.TrimSpace(out)
execDir := filepath.Join(execDriverPath, id)
stateFile := filepath.Join(execDir, "state.json")
{
fi, err := os.Stat(execDir)
if err != nil {
c.Fatal(err)
}
if !fi.IsDir() {
c.Fatalf("%q must be a directory", execDir)
}
fi, err = os.Stat(stateFile)
if err != nil {
c.Fatal(err)
}
}
stopCmd := exec.Command(dockerBinary, "stop", id)
out, _, err = runCommandWithOutput(stopCmd)
if err != nil {
c.Fatal(err, out)
}
{
_, err := os.Stat(execDir)
if err == nil {
c.Fatal(err)
}
if err == nil {
c.Fatalf("Exec directory %q exists for removed container!", execDir)
}
if !os.IsNotExist(err) {
c.Fatalf("Error should be about non-existing, got %s", err)
}
}
startCmd := exec.Command(dockerBinary, "start", id)
out, _, err = runCommandWithOutput(startCmd)
if err != nil {
c.Fatal(err, out)
}
{
fi, err := os.Stat(execDir)
if err != nil {
c.Fatal(err)
}
if !fi.IsDir() {
c.Fatalf("%q must be a directory", execDir)
}
fi, err = os.Stat(stateFile)
if err != nil {
c.Fatal(err)
}
}
rmCmd := exec.Command(dockerBinary, "rm", "-f", id)
out, _, err = runCommandWithOutput(rmCmd)
if err != nil {
c.Fatal(err, out)
}
{
_, err := os.Stat(execDir)
if err == nil {
c.Fatal(err)
}
if err == nil {
c.Fatalf("Exec directory %q is exists for removed container!", execDir)
}
if !os.IsNotExist(err) {
c.Fatalf("Error should be about non-existing, got %s", err)
}
}
}
func (s *DockerSuite) TestRunMutableNetworkFiles(c *check.C) {
testRequires(c, SameHostDaemon)
for _, fn := range []string{"resolv.conf", "hosts"} {
deleteAllContainers()
content, err := runCommandAndReadContainerFile(fn, exec.Command(dockerBinary, "run", "-d", "--name", "c1", "busybox", "sh", "-c", fmt.Sprintf("echo success >/etc/%s && top", fn)))
if err != nil {
c.Fatal(err)
}
if strings.TrimSpace(string(content)) != "success" {
c.Fatal("Content was not what was modified in the container", string(content))
}
out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "--name", "c2", "busybox", "top"))
if err != nil {
c.Fatal(err)
}
contID := strings.TrimSpace(out)
netFilePath := containerStorageFile(contID, fn)
f, err := os.OpenFile(netFilePath, os.O_WRONLY|os.O_SYNC|os.O_APPEND, 0644)
if err != nil {
c.Fatal(err)
}
if _, err := f.Seek(0, 0); err != nil {
f.Close()
c.Fatal(err)
}
if err := f.Truncate(0); err != nil {
f.Close()
c.Fatal(err)
}
if _, err := f.Write([]byte("success2\n")); err != nil {
f.Close()
c.Fatal(err)
}
f.Close()
res, err := exec.Command(dockerBinary, "exec", contID, "cat", "/etc/"+fn).CombinedOutput()
if err != nil {
c.Fatalf("Output: %s, error: %s", res, err)
}
if string(res) != "success2\n" {
c.Fatalf("Expected content of %s: %q, got: %q", fn, "success2\n", res)
}
}
}
func (s *DockerSuite) TestExecWithUser(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "parent", "busybox", "top")
if out, _, err := runCommandWithOutput(runCmd); err != nil {
c.Fatal(out, err)
}
cmd := exec.Command(dockerBinary, "exec", "-u", "1", "parent", "id")
out, _, err := runCommandWithOutput(cmd)
if err != nil {
c.Fatal(err, out)
}
if !strings.Contains(out, "uid=1(daemon) gid=1(daemon)") {
c.Fatalf("exec with user by id expected daemon user got %s", out)
}
cmd = exec.Command(dockerBinary, "exec", "-u", "root", "parent", "id")
out, _, err = runCommandWithOutput(cmd)
if err != nil {
c.Fatal(err, out)
}
if !strings.Contains(out, "uid=0(root) gid=0(root)") {
c.Fatalf("exec with user by root expected root user got %s", out)
}
}
func (s *DockerSuite) TestExecWithPrivileged(c *check.C) {
runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "parent", "--cap-drop=ALL", "busybox", "top")
if out, _, err := runCommandWithOutput(runCmd); err != nil {
c.Fatal(out, err)
}
cmd := exec.Command(dockerBinary, "exec", "parent", "sh", "-c", "mknod /tmp/sda b 8 0")
out, _, err := runCommandWithOutput(cmd)
if err == nil || !strings.Contains(out, "Operation not permitted") {
c.Fatalf("exec mknod in --cap-drop=ALL container without --privileged should failed")
}
cmd = exec.Command(dockerBinary, "exec", "--privileged", "parent", "sh", "-c", "mknod /tmp/sda b 8 0 && echo ok")
out, _, err = runCommandWithOutput(cmd)
if err != nil {
c.Fatal(err, out)
}
if actual := strings.TrimSpace(out); actual != "ok" {
c.Fatalf("exec mknod in --cap-drop=ALL container with --privileged failed: %v, output: %q", err, out)
}
}
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