// TODO(vishh): Add support for running in priviledged mode and running as a different user.
func (d *driver) Exec(c *execdriver.Command, processConfig *execdriver.ProcessConfig, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
active := d.activeContainers[c.ID]
if active == nil {
return -1, fmt.Errorf("No active container exists with ID %s", c.ID)
}
state, err := libcontainer.GetState(filepath.Join(d.root, c.ID))
if err != nil {
return -1, fmt.Errorf("State unavailable for container with ID %s. The container may have been cleaned up already. Error: %s", c.ID, err)
}
var term execdriver.Terminal
if processConfig.Tty {
term, err = NewTtyConsole(processConfig, pipes)
} else {
term, err = execdriver.NewStdConsole(processConfig, pipes)
}
processConfig.Terminal = term
args := append([]string{processConfig.Entrypoint}, processConfig.Arguments...)
return namespaces.ExecIn(active.container, state, args, os.Args[0], "exec", processConfig.Stdin, processConfig.Stdout, processConfig.Stderr, processConfig.Console,
func(cmd *exec.Cmd) {
if startCallback != nil {
startCallback(&c.ProcessConfig, cmd.Process.Pid)
}
})
}
func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
var (
term execdriver.Terminal
err error
)
if c.ProcessConfig.Tty {
term, err = NewTtyConsole(&c.ProcessConfig, pipes)
} else {
term, err = execdriver.NewStdConsole(&c.ProcessConfig, pipes)
}
c.ProcessConfig.Terminal = term
c.Mounts = append(c.Mounts, execdriver.Mount{
Source: d.initPath,
Destination: c.InitPath,
Writable: false,
Private: true,
})
if err := d.generateEnvConfig(c); err != nil {
return -1, err
}
configPath, err := d.generateLXCConfig(c)
if err != nil {
return -1, err
}
params := []string{
"lxc-start",
"-n", c.ID,
"-f", configPath,
"--",
c.InitPath,
}
if c.Network.Interface != nil {
params = append(params,
"-g", c.Network.Interface.Gateway,
"-i", fmt.Sprintf("%s/%d", c.Network.Interface.IPAddress, c.Network.Interface.IPPrefixLen),
)
}
params = append(params,
"-mtu", strconv.Itoa(c.Network.Mtu),
)
if c.ProcessConfig.User != "" {
params = append(params, "-u", c.ProcessConfig.User)
}
if c.ProcessConfig.Privileged {
if d.apparmor {
params[0] = path.Join(d.root, "lxc-start-unconfined")
}
params = append(params, "-privileged")
}
if c.WorkingDir != "" {
params = append(params, "-w", c.WorkingDir)
}
if len(c.CapAdd) > 0 {
params = append(params, fmt.Sprintf("-cap-add=%s", strings.Join(c.CapAdd, ":")))
}
if len(c.CapDrop) > 0 {
params = append(params, fmt.Sprintf("-cap-drop=%s", strings.Join(c.CapDrop, ":")))
}
params = append(params, "--", c.ProcessConfig.Entrypoint)
params = append(params, c.ProcessConfig.Arguments...)
if d.sharedRoot {
// lxc-start really needs / to be non-shared, or all kinds of stuff break
// when lxc-start unmount things and those unmounts propagate to the main
// mount namespace.
// What we really want is to clone into a new namespace and then
// mount / MS_REC|MS_SLAVE, but since we can't really clone or fork
// without exec in go we have to do this horrible shell hack...
shellString :=
"mount --make-rslave /; exec " +
utils.ShellQuoteArguments(params)
params = []string{
"unshare", "-m", "--", "/bin/sh", "-c", shellString,
}
}
var (
name = params[0]
arg = params[1:]
)
aname, err := exec.LookPath(name)
if err != nil {
aname = name
}
c.ProcessConfig.Path = aname
c.ProcessConfig.Args = append([]string{name}, arg...)
if err := nodes.CreateDeviceNodes(c.Rootfs, c.AutoCreatedDevices); err != nil {
return -1, err
}
if err := c.ProcessConfig.Start(); err != nil {
return -1, err
}
var (
waitErr error
waitLock = make(chan struct{})
)
go func() {
if err := c.ProcessConfig.Wait(); err != nil {
if _, ok := err.(*exec.ExitError); !ok { // Do not propagate the error if it's simply a status code != 0
waitErr = err
}
}
close(waitLock)
}()
// Poll lxc for RUNNING status
pid, err := d.waitForStart(c, waitLock)
if err != nil {
if c.ProcessConfig.Process != nil {
c.ProcessConfig.Process.Kill()
c.ProcessConfig.Wait()
}
return -1, err
}
c.ContainerPid = pid
if startCallback != nil {
startCallback(&c.ProcessConfig, pid)
}
<-waitLock
return getExitCode(c), waitErr
}
func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (execdriver.ExitStatus, error) {
var (
term execdriver.Terminal
err error
dataPath = d.containerDir(c.ID)
)
if c.ProcessConfig.Tty {
term, err = NewTtyConsole(&c.ProcessConfig, pipes)
} else {
term, err = execdriver.NewStdConsole(&c.ProcessConfig, pipes)
}
c.ProcessConfig.Terminal = term
container, err := d.createContainer(c)
if err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
d.Lock()
d.activeContainers[c.ID] = &activeContainer{
container: container,
cmd: &c.ProcessConfig.Cmd,
}
d.Unlock()
c.Mounts = append(c.Mounts, execdriver.Mount{
Source: d.initPath,
Destination: c.InitPath,
Writable: false,
Private: true,
})
if err := d.generateEnvConfig(c); err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
configPath, err := d.generateLXCConfig(c)
if err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
params := []string{
"lxc-start",
"-n", c.ID,
"-f", configPath,
}
// From lxc>=1.1 the default behavior is to daemonize containers after start
lxcVersion := version.Version(d.version())
if lxcVersion.GreaterThanOrEqualTo(version.Version("1.1")) {
params = append(params, "-F")
}
if c.Network.ContainerID != "" {
params = append(params,
"--share-net", c.Network.ContainerID,
)
}
if c.Ipc != nil {
if c.Ipc.ContainerID != "" {
params = append(params,
"--share-ipc", c.Ipc.ContainerID,
)
} else if c.Ipc.HostIpc {
params = append(params,
"--share-ipc", "1",
)
}
}
params = append(params,
"--",
c.InitPath,
)
if c.Network.Interface != nil {
params = append(params,
"-g", c.Network.Interface.Gateway,
"-i", fmt.Sprintf("%s/%d", c.Network.Interface.IPAddress, c.Network.Interface.IPPrefixLen),
)
}
params = append(params,
"-mtu", strconv.Itoa(c.Network.Mtu),
)
if c.ProcessConfig.User != "" {
params = append(params, "-u", c.ProcessConfig.User)
}
if c.ProcessConfig.Privileged {
if d.apparmor {
params[0] = path.Join(d.root, "lxc-start-unconfined")
}
params = append(params, "-privileged")
}
if c.WorkingDir != "" {
params = append(params, "-w", c.WorkingDir)
}
params = append(params, "--", c.ProcessConfig.Entrypoint)
params = append(params, c.ProcessConfig.Arguments...)
if d.sharedRoot {
// lxc-start really needs / to be non-shared, or all kinds of stuff break
// when lxc-start unmount things and those unmounts propagate to the main
// mount namespace.
// What we really want is to clone into a new namespace and then
// mount / MS_REC|MS_SLAVE, but since we can't really clone or fork
// without exec in go we have to do this horrible shell hack...
shellString :=
"mount --make-rslave /; exec " +
utils.ShellQuoteArguments(params)
params = []string{
"unshare", "-m", "--", "/bin/sh", "-c", shellString,
}
}
logrus.Debugf("lxc params %s", params)
var (
name = params[0]
arg = params[1:]
)
aname, err := exec.LookPath(name)
if err != nil {
aname = name
}
c.ProcessConfig.Path = aname
c.ProcessConfig.Args = append([]string{name}, arg...)
if err := createDeviceNodes(c.Rootfs, c.AutoCreatedDevices); err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
if err := c.ProcessConfig.Start(); err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
var (
waitErr error
waitLock = make(chan struct{})
)
go func() {
if err := c.ProcessConfig.Wait(); err != nil {
if _, ok := err.(*exec.ExitError); !ok { // Do not propagate the error if it's simply a status code != 0
waitErr = err
}
}
close(waitLock)
}()
terminate := func(terr error) (execdriver.ExitStatus, error) {
if c.ProcessConfig.Process != nil {
c.ProcessConfig.Process.Kill()
c.ProcessConfig.Wait()
}
return execdriver.ExitStatus{ExitCode: -1}, terr
}
// Poll lxc for RUNNING status
pid, err := d.waitForStart(c, waitLock)
if err != nil {
return terminate(err)
}
cgroupPaths, err := cgroupPaths(c.ID)
if err != nil {
return terminate(err)
}
state := &libcontainer.State{
InitProcessPid: pid,
CgroupPaths: cgroupPaths,
}
f, err := os.Create(filepath.Join(dataPath, "state.json"))
if err != nil {
return terminate(err)
}
defer f.Close()
if err := json.NewEncoder(f).Encode(state); err != nil {
return terminate(err)
}
c.ContainerPid = pid
if startCallback != nil {
logrus.Debugf("Invoking startCallback")
startCallback(&c.ProcessConfig, pid)
}
oomKill := false
oomKillNotification, err := notifyOnOOM(cgroupPaths)
<-waitLock
if err == nil {
_, oomKill = <-oomKillNotification
logrus.Debugf("oomKill error %s waitErr %s", oomKill, waitErr)
} else {
logrus.Warnf("Your kernel does not support OOM notifications: %s", err)
}
// check oom error
exitCode := getExitCode(c)
if oomKill {
exitCode = 137
}
return execdriver.ExitStatus{ExitCode: exitCode, OOMKilled: oomKill}, waitErr
}
func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (int, error) {
// take the Command and populate the libcontainer.Config from it
container, err := d.createContainer(c)
if err != nil {
return -1, err
}
var term execdriver.Terminal
if c.ProcessConfig.Tty {
term, err = NewTtyConsole(&c.ProcessConfig, pipes)
} else {
term, err = execdriver.NewStdConsole(&c.ProcessConfig, pipes)
}
if err != nil {
return -1, err
}
c.ProcessConfig.Terminal = term
d.Lock()
d.activeContainers[c.ID] = &activeContainer{
container: container,
cmd: &c.ProcessConfig.Cmd,
}
d.Unlock()
var (
dataPath = filepath.Join(d.root, c.ID)
args = append([]string{c.ProcessConfig.Entrypoint}, c.ProcessConfig.Arguments...)
)
if err := d.createContainerRoot(c.ID); err != nil {
return -1, err
}
defer d.removeContainerRoot(c.ID)
if err := d.writeContainerFile(container, c.ID); err != nil {
return -1, err
}
return namespaces.Exec(container, c.ProcessConfig.Stdin, c.ProcessConfig.Stdout, c.ProcessConfig.Stderr, c.ProcessConfig.Console, c.Rootfs, dataPath, args, func(container *libcontainer.Config, console, rootfs, dataPath, init string, child *os.File, args []string) *exec.Cmd {
c.ProcessConfig.Path = d.initPath
c.ProcessConfig.Args = append([]string{
DriverName,
"-console", console,
"-pipe", "3",
"-root", filepath.Join(d.root, c.ID),
"--",
}, args...)
// set this to nil so that when we set the clone flags anything else is reset
c.ProcessConfig.SysProcAttr = &syscall.SysProcAttr{
Cloneflags: uintptr(namespaces.GetNamespaceFlags(container.Namespaces)),
}
c.ProcessConfig.ExtraFiles = []*os.File{child}
c.ProcessConfig.Env = container.Env
c.ProcessConfig.Dir = c.Rootfs
return &c.ProcessConfig.Cmd
}, func() {
if startCallback != nil {
c.ContainerPid = c.ProcessConfig.Process.Pid
startCallback(&c.ProcessConfig, c.ContainerPid)
}
})
}
func (d *driver) Run(c *execdriver.Command, pipes *execdriver.Pipes, startCallback execdriver.StartCallback) (execdriver.ExitStatus, error) {
// take the Command and populate the libcontainer.Config from it
container, err := d.createContainer(c)
if err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
var term execdriver.Terminal
if c.ProcessConfig.Tty {
term, err = NewTtyConsole(&c.ProcessConfig, pipes)
} else {
term, err = execdriver.NewStdConsole(&c.ProcessConfig, pipes)
}
if err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
c.ProcessConfig.Terminal = term
d.Lock()
d.activeContainers[c.ID] = &activeContainer{
container: container,
cmd: &c.ProcessConfig.Cmd,
}
d.Unlock()
var (
dataPath = filepath.Join(d.root, c.ID)
args = append([]string{c.ProcessConfig.Entrypoint}, c.ProcessConfig.Arguments...)
)
if err := d.createContainerRoot(c.ID); err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
defer d.cleanContainer(c.ID)
if err := d.writeContainerFile(container, c.ID); err != nil {
return execdriver.ExitStatus{ExitCode: -1}, err
}
execOutputChan := make(chan execOutput, 1)
waitForStart := make(chan struct{})
go func() {
exitCode, err := namespaces.Exec(container, c.ProcessConfig.Stdin, c.ProcessConfig.Stdout, c.ProcessConfig.Stderr, c.ProcessConfig.Console, dataPath, args, func(container *libcontainer.Config, console, dataPath, init string, child *os.File, args []string) *exec.Cmd {
c.ProcessConfig.Path = d.initPath
c.ProcessConfig.Args = append([]string{
DriverName,
"-console", console,
"-pipe", "3",
"-root", filepath.Join(d.root, c.ID),
"--",
}, args...)
// set this to nil so that when we set the clone flags anything else is reset
c.ProcessConfig.SysProcAttr = &syscall.SysProcAttr{
Cloneflags: uintptr(namespaces.GetNamespaceFlags(container.Namespaces)),
}
c.ProcessConfig.ExtraFiles = []*os.File{child}
c.ProcessConfig.Env = container.Env
c.ProcessConfig.Dir = container.RootFs
return &c.ProcessConfig.Cmd
}, func() {
close(waitForStart)
if startCallback != nil {
c.ContainerPid = c.ProcessConfig.Process.Pid
startCallback(&c.ProcessConfig, c.ContainerPid)
}
})
execOutputChan <- execOutput{exitCode, err}
}()
select {
case execOutput := <-execOutputChan:
return execdriver.ExitStatus{ExitCode: execOutput.exitCode}, execOutput.err
case <-waitForStart:
break
}
oomKill := false
state, err := libcontainer.GetState(filepath.Join(d.root, c.ID))
if err == nil {
oomKillNotification, err := libcontainer.NotifyOnOOM(state)
if err == nil {
_, oomKill = <-oomKillNotification
} else {
log.Warnf("WARNING: Your kernel does not support OOM notifications: %s", err)
}
} else {
log.Warnf("Failed to get container state, oom notify will not work: %s", err)
}
// wait for the container to exit.
execOutput := <-execOutputChan
return execdriver.ExitStatus{ExitCode: execOutput.exitCode, OOMKilled: oomKill}, execOutput.err
}