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// +build !test_no_exec
package main
import (
"bufio"
"fmt"
"net/http"
"os"
"os/exec"
"reflect"
"sort"
"strings"
"sync"
"time"
"github.com/docker/docker/pkg/integration/checker"
"github.com/go-check/check"
)
func (s *DockerSuite) TestExec(c *check.C) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "sh", "-c", "echo test > /tmp/file && top")
c.Assert(waitRun(strings.TrimSpace(out)), check.IsNil)
out, _ = dockerCmd(c, "exec", "testing", "cat", "/tmp/file")
out = strings.Trim(out, "\r\n")
c.Assert(out, checker.Equals, "test")
}
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()
c.Assert(err, checker.IsNil)
stdout, err := execCmd.StdoutPipe()
c.Assert(err, checker.IsNil)
err = execCmd.Start()
c.Assert(err, checker.IsNil)
_, err = stdin.Write([]byte("cat /tmp/file\n"))
c.Assert(err, checker.IsNil)
r := bufio.NewReader(stdout)
line, err := r.ReadString('\n')
c.Assert(err, checker.IsNil)
line = strings.TrimSpace(line)
c.Assert(line, checker.Equals, "test")
err = stdin.Close()
c.Assert(err, checker.IsNil)
errChan := make(chan error)
go func() {
errChan <- execCmd.Wait()
close(errChan)
}()
select {
case err := <-errChan:
c.Assert(err, checker.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, _ := runSleepingContainer(c)
cleanedContainerID := strings.TrimSpace(out)
c.Assert(waitRun(cleanedContainerID), check.IsNil)
dockerCmd(c, "restart", cleanedContainerID)
c.Assert(waitRun(cleanedContainerID), check.IsNil)
out, _ = dockerCmd(c, "exec", cleanedContainerID, "echo", "hello")
outStr := strings.TrimSpace(out)
c.Assert(outStr, checker.Equals, "hello")
}
func (s *DockerDaemonSuite) TestExecAfterDaemonRestart(c *check.C) {
// TODO Windows CI: Requires a little work to get this ported.
testRequires(c, DaemonIsLinux)
testRequires(c, SameHostDaemon)
err := s.d.StartWithBusybox()
c.Assert(err, checker.IsNil)
out, err := s.d.Cmd("run", "-d", "--name", "top", "-p", "80", "busybox:latest", "top")
c.Assert(err, checker.IsNil, check.Commentf("Could not run top: %s", out))
err = s.d.Restart()
c.Assert(err, checker.IsNil, check.Commentf("Could not restart daemon"))
out, err = s.d.Cmd("start", "top")
c.Assert(err, checker.IsNil, check.Commentf("Could not start top after daemon restart: %s", out))
out, err = s.d.Cmd("exec", "top", "echo", "hello")
c.Assert(err, checker.IsNil, check.Commentf("Could not exec on container top: %s", out))
outStr := strings.TrimSpace(string(out))
c.Assert(outStr, checker.Equals, "hello")
}
// Regression test for #9155, #9044
func (s *DockerSuite) TestExecEnv(c *check.C) {
// TODO Windows CI: This one is interesting and may just end up being a feature
// difference between Windows and Linux. On Windows, the environment is passed
// into the process that is launched, not into the machine environment. Hence
// a subsequent exec will not have LALA set/
testRequires(c, DaemonIsLinux)
runSleepingContainer(c, "-e", "LALA=value1", "-e", "LALA=value2", "-d", "--name", "testing")
c.Assert(waitRun("testing"), check.IsNil)
out, _ := dockerCmd(c, "exec", "testing", "env")
c.Assert(out, checker.Not(checker.Contains), "LALA=value1")
c.Assert(out, checker.Contains, "LALA=value2")
c.Assert(out, checker.Contains, "HOME=/root")
}
func (s *DockerSuite) TestExecExitStatus(c *check.C) {
runSleepingContainer(c, "-d", "--name", "top")
// Test normal (non-detached) case first
cmd := exec.Command(dockerBinary, "exec", "top", "sh", "-c", "exit 23")
ec, _ := runCommand(cmd)
c.Assert(ec, checker.Equals, 23)
}
func (s *DockerSuite) TestExecPausedContainer(c *check.C) {
// Windows does not support pause
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")
c.Assert(err, checker.NotNil, check.Commentf("container should fail to exec new conmmand if it is paused"))
expected := ContainerID + " is paused, unpause the container before exec"
c.Assert(out, checker.Contains, expected, check.Commentf("container should not exec new command if it is paused"))
}
// regression test for #9476
func (s *DockerSuite) TestExecTTYCloseStdin(c *check.C) {
// TODO Windows CI: This requires some work to port to Windows.
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()
c.Assert(err, checker.IsNil)
stdinRw.Write([]byte("test"))
stdinRw.Close()
out, _, err := runCommandWithOutput(cmd)
c.Assert(err, checker.IsNil, check.Commentf(out))
out, _ = dockerCmd(c, "top", "exec_tty_stdin")
outArr := strings.Split(out, "\n")
c.Assert(len(outArr), checker.LessOrEqualThan, 3, check.Commentf("exec process left running"))
c.Assert(out, checker.Not(checker.Contains), "nsenter-exec")
}
func (s *DockerSuite) TestExecTTYWithoutStdin(c *check.C) {
// TODO Windows CI: This requires some work to port to Windows.
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "-ti", "busybox")
id := strings.TrimSpace(out)
c.Assert(waitRun(id), checker.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) {
// TODO Windows CI: Requires some extra work. Consider copying the
// runSleepingContainer helper to have an exec version.
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "top", "busybox", "top")
// Test normal (non-detached) case first
cmd := exec.Command(dockerBinary, "exec", "top")
_, stderr, _, err := runCommandWithStdoutStderr(cmd)
c.Assert(err, checker.NotNil)
c.Assert(stderr, checker.Contains, "See '"+dockerBinary+" exec --help'")
}
func (s *DockerSuite) TestExecStopNotHanging(c *check.C) {
// TODO Windows CI: Requires some extra work. Consider copying the
// runSleepingContainer helper to have an exec version.
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "testing", "busybox", "top")
err := exec.Command(dockerBinary, "exec", "testing", "top").Start()
c.Assert(err, checker.IsNil)
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) {
// Not applicable on Windows - using Linux specific functionality
testRequires(c, NotUserNamespace)
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, checker.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) TestExecInspectID(c *check.C) {
out, _ := runSleepingContainer(c, "-d")
id := strings.TrimSuffix(out, "\n")
out = inspectField(c, id, "ExecIDs")
c.Assert(out, checker.Equals, "[]", check.Commentf("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 /execid1; do sleep 1; done")
err := cmd.Start()
c.Assert(err, checker.IsNil, check.Commentf("failed to start the exec cmd"))
// 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 = strings.TrimSpace(inspectField(c, id, "ExecIDs"))
if out != "[]" && out != "<no value>" {
break
}
c.Assert(i+1, checker.Not(checker.Equals), tries, check.Commentf("ExecIDs still empty after 10 second"))
time.Sleep(1 * time.Second)
}
// Save execID for later
execID, err := inspectFilter(id, "index .ExecIDs 0")
c.Assert(err, checker.IsNil, check.Commentf("failed to get the exec id"))
// End the exec by creating the missing file
err = exec.Command(dockerBinary, "exec", id,
"sh", "-c", "touch /execid1").Run()
c.Assert(err, checker.IsNil, check.Commentf("failed to run the 2nd exec cmd"))
// Wait for 1st exec to complete
cmd.Wait()
// Give the exec 10 chances/seconds to stop then give up and stop the test
for i := 0; i < tries; i++ {
// Since its still running we should see exec as part of the container
out = strings.TrimSpace(inspectField(c, id, "ExecIDs"))
if out == "[]" {
break
}
c.Assert(i+1, checker.Not(checker.Equals), tries, check.Commentf("ExecIDs still not empty after 10 second"))
time.Sleep(1 * time.Second)
}
// But we should still be able to query the execID
sc, body, err := sockRequest("GET", "/exec/"+execID+"/json", nil)
c.Assert(sc, checker.Equals, http.StatusOK, check.Commentf("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)
c.Assert(ec, checker.Equals, 0, check.Commentf("error removing container: %s", out))
sc, body, err = sockRequest("GET", "/exec/"+execID+"/json", nil)
c.Assert(sc, checker.Equals, http.StatusNotFound, check.Commentf("received status != 404: %d\n%s", sc, body))
}
func (s *DockerSuite) TestLinksPingLinkedContainersOnRename(c *check.C) {
// Problematic on Windows as Windows does not support links
testRequires(c, DaemonIsLinux)
var out string
out, _ = dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
idA := strings.TrimSpace(out)
c.Assert(idA, checker.Not(checker.Equals), "", check.Commentf("%s, id should not be nil", out))
out, _ = dockerCmd(c, "run", "-d", "--link", "container1:alias1", "--name", "container2", "busybox", "top")
idB := strings.TrimSpace(out)
c.Assert(idB, checker.Not(checker.Equals), "", check.Commentf("%s, id should not be nil", out))
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) TestRunMutableNetworkFiles(c *check.C) {
// Not applicable on Windows to Windows CI.
testRequires(c, SameHostDaemon, DaemonIsLinux)
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)))
c.Assert(err, checker.IsNil)
c.Assert(strings.TrimSpace(string(content)), checker.Equals, "success", check.Commentf("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)
c.Assert(err, checker.IsNil)
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)
c.Assert(res, checker.Equals, "success2\n")
}
}
func (s *DockerSuite) TestExecWithUser(c *check.C) {
// TODO Windows CI: This may be fixable in the future once Windows
// supports users
testRequires(c, DaemonIsLinux)
dockerCmd(c, "run", "-d", "--name", "parent", "busybox", "top")
out, _ := dockerCmd(c, "exec", "-u", "1", "parent", "id")
c.Assert(out, checker.Contains, "uid=1(daemon) gid=1(daemon)")
out, _ = dockerCmd(c, "exec", "-u", "root", "parent", "id")
c.Assert(out, checker.Contains, "uid=0(root) gid=0(root)", check.Commentf("exec with user by id expected daemon user got %s", out))
}
func (s *DockerSuite) TestExecWithPrivileged(c *check.C) {
// Not applicable on Windows
testRequires(c, DaemonIsLinux, NotUserNamespace)
// 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)
c.Assert(err, checker.NotNil, check.Commentf("exec mknod in --cap-drop=ALL container without --privileged should fail"))
c.Assert(out, checker.Contains, "Operation not permitted", check.Commentf("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)
c.Assert(err, checker.IsNil)
actual := strings.TrimSpace(out)
c.Assert(actual, checker.Equals, "ok", check.Commentf("exec mknod in --cap-drop=ALL container with --privileged failed, output: %q", 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)
c.Assert(err, checker.NotNil, check.Commentf("repeating exec mknod in --cap-drop=ALL container after --privileged without --privileged should fail"))
c.Assert(out, checker.Contains, "Operation not permitted", check.Commentf("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")
out, _, err = runCommandWithOutput(logCmd)
c.Assert(err, checker.IsNil)
c.Assert(out, checker.Not(checker.Contains), "Success")
}
func (s *DockerSuite) TestExecWithImageUser(c *check.C) {
// Not applicable on Windows
testRequires(c, DaemonIsLinux)
name := "testbuilduser"
_, err := buildImage(name,
`FROM busybox
RUN echo 'dockerio:x:1001:1001::/bin:/bin/false' >> /etc/passwd
USER dockerio`,
true)
c.Assert(err, checker.IsNil)
dockerCmd(c, "run", "-d", "--name", "dockerioexec", name, "top")
out, _ := dockerCmd(c, "exec", "dockerioexec", "whoami")
c.Assert(out, checker.Contains, "dockerio", check.Commentf("exec with user by id expected dockerio user got %s", out))
}
func (s *DockerSuite) TestExecOnReadonlyContainer(c *check.C) {
// Windows does not support read-only
// --read-only + userns has remount issues
testRequires(c, DaemonIsLinux, NotUserNamespace)
dockerCmd(c, "run", "-d", "--read-only", "--name", "parent", "busybox", "top")
dockerCmd(c, "exec", "parent", "true")
}
func (s *DockerSuite) TestExecUlimits(c *check.C) {
testRequires(c, DaemonIsLinux)
name := "testexeculimits"
runSleepingContainer(c, "-d", "--ulimit", "nproc=21", "--name", name)
c.Assert(waitRun(name), checker.IsNil)
out, _, err := dockerCmdWithError("exec", name, "sh", "-c", "ulimit -p")
c.Assert(err, checker.IsNil)
c.Assert(strings.TrimSpace(out), checker.Equals, "21")
}
// #15750
func (s *DockerSuite) TestExecStartFails(c *check.C) {
// TODO Windows CI. This test should be portable. Figure out why it fails
// currently.
testRequires(c, DaemonIsLinux)
name := "exec-15750"
runSleepingContainer(c, "-d", "--name", name)
c.Assert(waitRun(name), checker.IsNil)
out, _, err := dockerCmdWithError("exec", name, "no-such-cmd")
c.Assert(err, checker.NotNil, check.Commentf(out))
c.Assert(out, checker.Contains, "executable file not found")
}
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