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// +build !test_no_exec
package main
import (
"bufio"
"fmt"
"net/http"
"os"
"os/exec"
"path/filepath"
"reflect"
"sort"
"strings"
"sync"
"time"
"github.com/go-check/check"
)
func (s *DockerSuite) TestExec(c *check.C) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "sh", "-c", "echo test > /tmp/file && top")
out, _ := dockerCmd(c, "exec", "testing", "cat", "/tmp/file")
out = strings.Trim(out, "\r\n")
if out != "test" {
c.Errorf("container exec should've printed test but printed %q", out)
}
}
func (s *DockerSuite) TestExecInteractive(c *check.C) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "sh", "-c", "echo test > /tmp/file && top")
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) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
cleanedContainerID := strings.TrimSpace(out)
dockerCmd(c, "restart", cleanedContainerID)
out, _ = dockerCmd(c, "exec", cleanedContainerID, "echo", "hello")
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, DaemonIsLinux)
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) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-e", "LALA=value1", "-e", "LALA=value2",
"-d", "--name", "testing", "busybox", "top")
out, _ := dockerCmd(c, "exec", "testing", "env")
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) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "top", "busybox", "top")
// 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) {
testRequires(c, DaemonIsLinux)
defer unpauseAllContainers()
out, _ := dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "top")
ContainerID := strings.TrimSpace(out)
dockerCmd(c, "pause", "testing")
out, _, err := dockerCmdWithError("exec", "-i", "-t", ContainerID, "echo", "hello")
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) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "-it", "--name", "exec_tty_stdin", "busybox")
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)
}
out, _ := dockerCmd(c, "top", "exec_tty_stdin")
outArr := strings.Split(out, "\n")
if len(outArr) > 3 || strings.Contains(out, "nsenter-exec") {
c.Fatalf("exec process left running\n\t %s", out)
}
}
func (s *DockerSuite) TestExecTtyWithoutStdin(c *check.C) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "-ti", "busybox")
id := strings.TrimSpace(out)
c.Assert(waitRun(id), check.IsNil)
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) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "top", "busybox", "top")
// 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) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "top")
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) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "top")
out, _ := dockerCmd(c, "exec", "testing", "cat", "/proc/1/cgroup")
containerCgroups := sort.StringSlice(strings.Split(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() {
out, _, err := dockerCmdWithError("exec", "testing", "cat", "/proc/self/cgroup")
if err != nil {
errChan <- err
return
}
cg := sort.StringSlice(strings.Split(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) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
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)
}
// Start an exec, have it block waiting so we can do some checking
cmd := exec.Command(dockerBinary, "exec", id, "sh", "-c",
"while ! test -e /tmp/execid1; do sleep 1; done")
if err = cmd.Start(); err != nil {
c.Fatalf("failed to start the exec cmd: %q", err)
}
// Give the exec 10 chances/seconds to start then give up and stop the test
tries := 10
for i := 0; i < tries; i++ {
// Since its still running we should see exec as part of the container
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>" {
break
}
if i+1 == tries {
c.Fatalf("ExecIDs should not be empty, got: %s", out)
}
time.Sleep(1 * time.Second)
}
// Save execID for later
execID, err := inspectFilter(id, "index .ExecIDs 0")
if err != nil {
c.Fatalf("failed to get the exec id: %v", err)
}
// End the exec by creating the missing file
err = exec.Command(dockerBinary, "exec", id,
"sh", "-c", "touch /tmp/execid1").Run()
if err != nil {
c.Fatalf("failed to run the 2nd exec cmd: %q", err)
}
// Wait for 1st exec to complete
cmd.Wait()
// All execs for the container should be gone now
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 be empty, got: %s", out)
}
// But we should still be able to query the execID
sc, body, err := sockRequest("GET", "/exec/"+execID+"/json", nil)
if sc != http.StatusOK {
c.Fatalf("received status != 200 OK: %d\n%s", sc, body)
}
// Now delete the container and then an 'inspect' on the exec should
// result in a 404 (not 'container not running')
out, ec := dockerCmd(c, "rm", "-f", id)
if ec != 0 {
c.Fatalf("error removing container: %s", out)
}
sc, body, err = sockRequest("GET", "/exec/"+execID+"/json", nil)
if sc != http.StatusNotFound {
c.Fatalf("received status != 404: %d\n%s", sc, body)
}
}
func (s *DockerSuite) TestLinksPingLinkedContainersOnRename(c *check.C) {
testRequires(c, DaemonIsLinux)
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")
}
dockerCmd(c, "exec", "container2", "ping", "-c", "1", "alias1", "-W", "1")
dockerCmd(c, "rename", "container1", "container_new")
dockerCmd(c, "exec", "container2", "ping", "-c", "1", "alias1", "-W", "1")
}
func (s *DockerSuite) TestRunExecDir(c *check.C) {
testRequires(c, SameHostDaemon)
out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
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)
}
}
dockerCmd(c, "stop", id)
{
_, 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)
}
}
dockerCmd(c, "start", id)
{
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)
}
}
dockerCmd(c, "rm", "-f", id)
{
_, 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, _ := dockerCmd(c, "run", "-d", "--name", "c2", "busybox", "top")
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, _ := dockerCmd(c, "exec", contID, "cat", "/etc/"+fn)
if res != "success2\n" {
c.Fatalf("Expected content of %s: %q, got: %q", fn, "success2\n", res)
}
}
}
func (s *DockerSuite) TestExecWithUser(c *check.C) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "parent", "busybox", "top")
out, _ := dockerCmd(c, "exec", "-u", "1", "parent", "id")
if !strings.Contains(out, "uid=1(daemon) gid=1(daemon)") {
c.Fatalf("exec with user by id expected daemon user got %s", out)
}
out, _ = dockerCmd(c, "exec", "-u", "root", "parent", "id")
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) {
testRequires(c, DaemonIsLinux)
// Start main loop which attempts mknod repeatedly
dockerCmd(c, "run", "-d", "--name", "parent", "--cap-drop=ALL", "busybox", "sh", "-c", `while (true); do if [ -e /exec_priv ]; then cat /exec_priv && mknod /tmp/sda b 8 0 && echo "Success"; else echo "Privileged exec has not run yet"; fi; usleep 10000; done`)
// Check exec mknod doesn't work
cmd := exec.Command(dockerBinary, "exec", "parent", "sh", "-c", "mknod /tmp/sdb b 8 16")
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 fail")
}
// Check exec mknod does work with --privileged
cmd = exec.Command(dockerBinary, "exec", "--privileged", "parent", "sh", "-c", `echo "Running exec --privileged" > /exec_priv && mknod /tmp/sdb b 8 16 && usleep 50000 && echo "Finished exec --privileged" > /exec_priv && 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)
}
// Check subsequent unprivileged exec cannot mknod
cmd = exec.Command(dockerBinary, "exec", "parent", "sh", "-c", "mknod /tmp/sdc b 8 32")
out, _, err = runCommandWithOutput(cmd)
if err == nil || !strings.Contains(out, "Operation not permitted") {
c.Fatalf("repeating exec mknod in --cap-drop=ALL container after --privileged without --privileged should fail")
}
// Confirm at no point was mknod allowed
logCmd := exec.Command(dockerBinary, "logs", "parent")
if out, _, err := runCommandWithOutput(logCmd); err != nil || strings.Contains(out, "Success") {
c.Fatal(out, err)
}
}
func (s *DockerSuite) TestExecWithImageUser(c *check.C) {
testRequires(c, DaemonIsLinux)
name := "testbuilduser"
_, err := buildImage(name,
`FROM busybox
RUN echo 'dockerio:x:1001:1001::/bin:/bin/false' >> /etc/passwd
USER dockerio`,
true)
if err != nil {
c.Fatalf("Could not build image %s: %v", name, err)
}
dockerCmd(c, "run", "-d", "--name", "dockerioexec", name, "top")
out, _ := dockerCmd(c, "exec", "dockerioexec", "whoami")
if !strings.Contains(out, "dockerio") {
c.Fatalf("exec with user by id expected dockerio user got %s", out)
}
}
func (s *DockerSuite) TestExecOnReadonlyContainer(c *check.C) {
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--read-only", "--name", "parent", "busybox", "top")
if _, status := dockerCmd(c, "exec", "parent", "true"); status != 0 {
c.Fatalf("exec into a read-only container failed with exit status %d", status)
}
}
// #15750
func (s *DockerSuite) TestExecStartFails(c *check.C) {
testRequires(c, DaemonIsLinux)
name := "exec-15750"
dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
_, errmsg, status := dockerCmdWithStdoutStderr(nil, "exec", name, "no-such-cmd")
if status == 255 && !strings.Contains(errmsg, "executable file not found") {
c.Fatal("exec error message not received. The daemon might had crashed")
}
}
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