mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 00:10:20 +00:00
136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package dockershim
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"time"
|
|
|
|
dockertypes "github.com/docker/docker/api/types"
|
|
"github.com/golang/glog"
|
|
|
|
"k8s.io/client-go/tools/remotecommand"
|
|
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
|
|
|
|
"k8s.io/kubernetes/pkg/kubelet/dockershim/libdocker"
|
|
)
|
|
|
|
// ExecHandler knows how to execute a command in a running Docker container.
|
|
type ExecHandler interface {
|
|
ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error
|
|
}
|
|
|
|
type dockerExitError struct {
|
|
Inspect *dockertypes.ContainerExecInspect
|
|
}
|
|
|
|
func (d *dockerExitError) String() string {
|
|
return d.Error()
|
|
}
|
|
|
|
func (d *dockerExitError) Error() string {
|
|
return fmt.Sprintf("Error executing in Docker Container: %d", d.Inspect.ExitCode)
|
|
}
|
|
|
|
func (d *dockerExitError) Exited() bool {
|
|
return !d.Inspect.Running
|
|
}
|
|
|
|
func (d *dockerExitError) ExitStatus() int {
|
|
return d.Inspect.ExitCode
|
|
}
|
|
|
|
// NativeExecHandler executes commands in Docker containers using Docker's exec API.
|
|
type NativeExecHandler struct{}
|
|
|
|
func (*NativeExecHandler) ExecInContainer(client libdocker.Interface, container *dockertypes.ContainerJSON, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize, timeout time.Duration) error {
|
|
done := make(chan struct{})
|
|
defer close(done)
|
|
|
|
createOpts := dockertypes.ExecConfig{
|
|
Cmd: cmd,
|
|
AttachStdin: stdin != nil,
|
|
AttachStdout: stdout != nil,
|
|
AttachStderr: stderr != nil,
|
|
Tty: tty,
|
|
}
|
|
execObj, err := client.CreateExec(container.ID, createOpts)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to exec in container - Exec setup failed - %v", err)
|
|
}
|
|
|
|
// Have to start this before the call to client.StartExec because client.StartExec is a blocking
|
|
// call :-( Otherwise, resize events don't get processed and the terminal never resizes.
|
|
//
|
|
// We also have to delay attempting to send a terminal resize request to docker until after the
|
|
// exec has started; otherwise, the initial resize request will fail.
|
|
execStarted := make(chan struct{})
|
|
go func() {
|
|
select {
|
|
case <-execStarted:
|
|
// client.StartExec has started the exec, so we can start resizing
|
|
case <-done:
|
|
// ExecInContainer has returned, so short-circuit
|
|
return
|
|
}
|
|
|
|
kubecontainer.HandleResizing(resize, func(size remotecommand.TerminalSize) {
|
|
client.ResizeExecTTY(execObj.ID, uint(size.Height), uint(size.Width))
|
|
})
|
|
}()
|
|
|
|
startOpts := dockertypes.ExecStartCheck{Detach: false, Tty: tty}
|
|
streamOpts := libdocker.StreamOptions{
|
|
InputStream: stdin,
|
|
OutputStream: stdout,
|
|
ErrorStream: stderr,
|
|
RawTerminal: tty,
|
|
ExecStarted: execStarted,
|
|
}
|
|
err = client.StartExec(execObj.ID, startOpts, streamOpts)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ticker := time.NewTicker(2 * time.Second)
|
|
defer ticker.Stop()
|
|
count := 0
|
|
for {
|
|
inspect, err2 := client.InspectExec(execObj.ID)
|
|
if err2 != nil {
|
|
return err2
|
|
}
|
|
if !inspect.Running {
|
|
if inspect.ExitCode != 0 {
|
|
err = &dockerExitError{inspect}
|
|
}
|
|
break
|
|
}
|
|
|
|
count++
|
|
if count == 5 {
|
|
glog.Errorf("Exec session %s in container %s terminated but process still running!", execObj.ID, container.ID)
|
|
break
|
|
}
|
|
|
|
<-ticker.C
|
|
}
|
|
|
|
return err
|
|
}
|