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package container
import (
"fmt"
"io"
"github.com/Sirupsen/logrus"
"github.com/docker/cli/cli"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/opts"
"github.com/docker/docker/api/types"
apiclient "github.com/docker/docker/client"
"github.com/docker/docker/pkg/promise"
"github.com/spf13/cobra"
"golang.org/x/net/context"
)
type execOptions struct {
detachKeys string
interactive bool
tty bool
detach bool
user string
privileged bool
env *opts.ListOpts
}
func newExecOptions() *execOptions {
var values []string
return &execOptions{
env: opts.NewListOptsRef(&values, opts.ValidateEnv),
}
}
// NewExecCommand creates a new cobra.Command for `docker exec`
func NewExecCommand(dockerCli command.Cli) *cobra.Command {
options := newExecOptions()
cmd := &cobra.Command{
Use: "exec [OPTIONS] CONTAINER COMMAND [ARG...]",
Short: "Run a command in a running container",
Args: cli.RequiresMinArgs(2),
RunE: func(cmd *cobra.Command, args []string) error {
container := args[0]
execCmd := args[1:]
return runExec(dockerCli, options, container, execCmd)
},
}
flags := cmd.Flags()
flags.SetInterspersed(false)
flags.StringVarP(&options.detachKeys, "detach-keys", "", "", "Override the key sequence for detaching a container")
flags.BoolVarP(&options.interactive, "interactive", "i", false, "Keep STDIN open even if not attached")
flags.BoolVarP(&options.tty, "tty", "t", false, "Allocate a pseudo-TTY")
flags.BoolVarP(&options.detach, "detach", "d", false, "Detached mode: run command in the background")
flags.StringVarP(&options.user, "user", "u", "", "Username or UID (format: <name|uid>[:<group|gid>])")
flags.BoolVarP(&options.privileged, "privileged", "", false, "Give extended privileges to the command")
flags.VarP(options.env, "env", "e", "Set environment variables")
flags.SetAnnotation("env", "version", []string{"1.25"})
return cmd
}
// nolint: gocyclo
func runExec(dockerCli command.Cli, options *execOptions, container string, execCmd []string) error {
execConfig, err := parseExec(options, execCmd)
// just in case the ParseExec does not exit
if container == "" || err != nil {
return cli.StatusError{StatusCode: 1}
}
if options.detachKeys != "" {
dockerCli.ConfigFile().DetachKeys = options.detachKeys
}
// Send client escape keys
execConfig.DetachKeys = dockerCli.ConfigFile().DetachKeys
ctx := context.Background()
client := dockerCli.Client()
// We need to check the tty _before_ we do the ContainerExecCreate, because
// otherwise if we error out we will leak execIDs on the server (and
// there's no easy way to clean those up). But also in order to make "not
// exist" errors take precedence we do a dummy inspect first.
if _, err := client.ContainerInspect(ctx, container); err != nil {
return err
}
if !execConfig.Detach {
if err := dockerCli.In().CheckTty(execConfig.AttachStdin, execConfig.Tty); err != nil {
return err
}
}
response, err := client.ContainerExecCreate(ctx, container, *execConfig)
if err != nil {
return err
}
execID := response.ID
if execID == "" {
fmt.Fprintln(dockerCli.Out(), "exec ID empty")
return nil
}
// Temp struct for execStart so that we don't need to transfer all the execConfig.
if execConfig.Detach {
execStartCheck := types.ExecStartCheck{
Detach: execConfig.Detach,
Tty: execConfig.Tty,
}
return client.ContainerExecStart(ctx, execID, execStartCheck)
}
// Interactive exec requested.
var (
out, stderr io.Writer
in io.ReadCloser
errCh chan error
)
if execConfig.AttachStdin {
in = dockerCli.In()
}
if execConfig.AttachStdout {
out = dockerCli.Out()
}
if execConfig.AttachStderr {
if execConfig.Tty {
stderr = dockerCli.Out()
} else {
stderr = dockerCli.Err()
}
}
resp, err := client.ContainerExecAttach(ctx, execID, *execConfig)
if err != nil {
return err
}
defer resp.Close()
errCh = promise.Go(func() error {
streamer := hijackedIOStreamer{
streams: dockerCli,
inputStream: in,
outputStream: out,
errorStream: stderr,
resp: resp,
tty: execConfig.Tty,
detachKeys: execConfig.DetachKeys,
}
return streamer.stream(ctx)
})
if execConfig.Tty && dockerCli.In().IsTerminal() {
if err := MonitorTtySize(ctx, dockerCli, execID, true); err != nil {
fmt.Fprintln(dockerCli.Err(), "Error monitoring TTY size:", err)
}
}
if err := <-errCh; err != nil {
logrus.Debugf("Error hijack: %s", err)
return err
}
var status int
if _, status, err = getExecExitCode(ctx, client, execID); err != nil {
return err
}
if status != 0 {
return cli.StatusError{StatusCode: status}
}
return nil
}
// getExecExitCode perform an inspect on the exec command. It returns
// the running state and the exit code.
func getExecExitCode(ctx context.Context, client apiclient.ContainerAPIClient, execID string) (bool, int, error) {
resp, err := client.ContainerExecInspect(ctx, execID)
if err != nil {
// If we can't connect, then the daemon probably died.
if !apiclient.IsErrConnectionFailed(err) {
return false, -1, err
}
return false, -1, nil
}
return resp.Running, resp.ExitCode, nil
}
// parseExec parses the specified args for the specified command and generates
// an ExecConfig from it.
func parseExec(opts *execOptions, execCmd []string) (*types.ExecConfig, error) {
execConfig := &types.ExecConfig{
User: opts.user,
Privileged: opts.privileged,
Tty: opts.tty,
Cmd: execCmd,
Detach: opts.detach,
}
// If -d is not set, attach to everything by default
if !opts.detach {
execConfig.AttachStdout = true
execConfig.AttachStderr = true
if opts.interactive {
execConfig.AttachStdin = true
}
}
if opts.env != nil {
execConfig.Env = opts.env.GetAll()
}
return execConfig, nil
}