mirror of https://github.com/docker/cli.git
267 lines
7.5 KiB
Go
267 lines
7.5 KiB
Go
package container
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import (
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"context"
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"fmt"
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"io"
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"os"
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"github.com/docker/cli/cli"
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"github.com/docker/cli/cli/command"
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"github.com/docker/cli/cli/command/completion"
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"github.com/docker/cli/cli/config/configfile"
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"github.com/docker/cli/opts"
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"github.com/docker/docker/api/types"
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apiclient "github.com/docker/docker/client"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"github.com/spf13/cobra"
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)
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// ExecOptions group options for `exec` command
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type ExecOptions struct {
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DetachKeys string
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Interactive bool
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TTY bool
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Detach bool
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User string
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Privileged bool
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Env opts.ListOpts
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Workdir string
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Container string
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Command []string
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EnvFile opts.ListOpts
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}
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// NewExecOptions creates a new ExecOptions
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func NewExecOptions() ExecOptions {
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return ExecOptions{
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Env: opts.NewListOpts(opts.ValidateEnv),
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EnvFile: opts.NewListOpts(nil),
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}
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}
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// NewExecCommand creates a new cobra.Command for `docker exec`
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func NewExecCommand(dockerCli command.Cli) *cobra.Command {
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options := NewExecOptions()
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cmd := &cobra.Command{
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Use: "exec [OPTIONS] CONTAINER COMMAND [ARG...]",
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Short: "Execute a command in a running container",
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Args: cli.RequiresMinArgs(2),
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RunE: func(cmd *cobra.Command, args []string) error {
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options.Container = args[0]
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options.Command = args[1:]
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return RunExec(dockerCli, options)
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},
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ValidArgsFunction: completion.ContainerNames(dockerCli, false, func(container types.Container) bool {
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return container.State != "paused"
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}),
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Annotations: map[string]string{
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"category-top": "2",
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"aliases": "docker container exec, docker exec",
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},
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}
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flags := cmd.Flags()
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flags.SetInterspersed(false)
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flags.StringVarP(&options.DetachKeys, "detach-keys", "", "", "Override the key sequence for detaching a container")
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flags.BoolVarP(&options.Interactive, "interactive", "i", false, "Keep STDIN open even if not attached")
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flags.BoolVarP(&options.TTY, "tty", "t", false, "Allocate a pseudo-TTY")
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flags.BoolVarP(&options.Detach, "detach", "d", false, "Detached mode: run command in the background")
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flags.StringVarP(&options.User, "user", "u", "", `Username or UID (format: "<name|uid>[:<group|gid>]")`)
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flags.BoolVarP(&options.Privileged, "privileged", "", false, "Give extended privileges to the command")
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flags.VarP(&options.Env, "env", "e", "Set environment variables")
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flags.SetAnnotation("env", "version", []string{"1.25"})
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flags.Var(&options.EnvFile, "env-file", "Read in a file of environment variables")
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flags.SetAnnotation("env-file", "version", []string{"1.25"})
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flags.StringVarP(&options.Workdir, "workdir", "w", "", "Working directory inside the container")
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flags.SetAnnotation("workdir", "version", []string{"1.35"})
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cmd.RegisterFlagCompletionFunc(
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"env",
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func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
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return os.Environ(), cobra.ShellCompDirectiveNoFileComp
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},
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)
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cmd.RegisterFlagCompletionFunc(
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"env-file",
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func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
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return nil, cobra.ShellCompDirectiveDefault // _filedir
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},
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)
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return cmd
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}
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// RunExec executes an `exec` command
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func RunExec(dockerCli command.Cli, options ExecOptions) error {
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execConfig, err := parseExec(options, dockerCli.ConfigFile())
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if err != nil {
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return err
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}
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ctx := context.Background()
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client := dockerCli.Client()
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// We need to check the tty _before_ we do the ContainerExecCreate, because
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// otherwise if we error out we will leak execIDs on the server (and
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// there's no easy way to clean those up). But also in order to make "not
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// exist" errors take precedence we do a dummy inspect first.
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if _, err := client.ContainerInspect(ctx, options.Container); err != nil {
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return err
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}
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if !execConfig.Detach {
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if err := dockerCli.In().CheckTty(execConfig.AttachStdin, execConfig.Tty); err != nil {
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return err
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}
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}
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fillConsoleSize(execConfig, dockerCli)
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response, err := client.ContainerExecCreate(ctx, options.Container, *execConfig)
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if err != nil {
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return err
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}
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execID := response.ID
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if execID == "" {
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return errors.New("exec ID empty")
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}
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if execConfig.Detach {
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execStartCheck := types.ExecStartCheck{
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Detach: execConfig.Detach,
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Tty: execConfig.Tty,
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ConsoleSize: execConfig.ConsoleSize,
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}
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return client.ContainerExecStart(ctx, execID, execStartCheck)
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}
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return interactiveExec(ctx, dockerCli, execConfig, execID)
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}
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func fillConsoleSize(execConfig *types.ExecConfig, dockerCli command.Cli) {
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if execConfig.Tty {
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height, width := dockerCli.Out().GetTtySize()
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execConfig.ConsoleSize = &[2]uint{height, width}
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}
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}
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func interactiveExec(ctx context.Context, dockerCli command.Cli, execConfig *types.ExecConfig, execID string) error {
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// Interactive exec requested.
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var (
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out, stderr io.Writer
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in io.ReadCloser
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)
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if execConfig.AttachStdin {
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in = dockerCli.In()
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}
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if execConfig.AttachStdout {
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out = dockerCli.Out()
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}
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if execConfig.AttachStderr {
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if execConfig.Tty {
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stderr = dockerCli.Out()
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} else {
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stderr = dockerCli.Err()
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}
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}
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fillConsoleSize(execConfig, dockerCli)
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client := dockerCli.Client()
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execStartCheck := types.ExecStartCheck{
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Tty: execConfig.Tty,
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ConsoleSize: execConfig.ConsoleSize,
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}
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resp, err := client.ContainerExecAttach(ctx, execID, execStartCheck)
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if err != nil {
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return err
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}
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defer resp.Close()
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errCh := make(chan error, 1)
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go func() {
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defer close(errCh)
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errCh <- func() error {
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streamer := hijackedIOStreamer{
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streams: dockerCli,
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inputStream: in,
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outputStream: out,
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errorStream: stderr,
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resp: resp,
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tty: execConfig.Tty,
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detachKeys: execConfig.DetachKeys,
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}
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return streamer.stream(ctx)
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}()
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}()
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if execConfig.Tty && dockerCli.In().IsTerminal() {
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if err := MonitorTtySize(ctx, dockerCli, execID, true); err != nil {
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fmt.Fprintln(dockerCli.Err(), "Error monitoring TTY size:", err)
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}
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}
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if err := <-errCh; err != nil {
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logrus.Debugf("Error hijack: %s", err)
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return err
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}
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return getExecExitStatus(ctx, client, execID)
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}
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func getExecExitStatus(ctx context.Context, client apiclient.ContainerAPIClient, execID string) error {
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resp, err := client.ContainerExecInspect(ctx, execID)
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if err != nil {
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// If we can't connect, then the daemon probably died.
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if !apiclient.IsErrConnectionFailed(err) {
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return err
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}
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return cli.StatusError{StatusCode: -1}
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}
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status := resp.ExitCode
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if status != 0 {
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return cli.StatusError{StatusCode: status}
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}
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return nil
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}
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// parseExec parses the specified args for the specified command and generates
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// an ExecConfig from it.
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func parseExec(execOpts ExecOptions, configFile *configfile.ConfigFile) (*types.ExecConfig, error) {
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execConfig := &types.ExecConfig{
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User: execOpts.User,
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Privileged: execOpts.Privileged,
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Tty: execOpts.TTY,
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Cmd: execOpts.Command,
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Detach: execOpts.Detach,
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WorkingDir: execOpts.Workdir,
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}
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// collect all the environment variables for the container
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var err error
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if execConfig.Env, err = opts.ReadKVEnvStrings(execOpts.EnvFile.GetAll(), execOpts.Env.GetAll()); err != nil {
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return nil, err
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}
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// If -d is not set, attach to everything by default
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if !execOpts.Detach {
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execConfig.AttachStdout = true
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execConfig.AttachStderr = true
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if execOpts.Interactive {
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execConfig.AttachStdin = true
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}
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}
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if execOpts.DetachKeys != "" {
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execConfig.DetachKeys = execOpts.DetachKeys
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} else {
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execConfig.DetachKeys = configFile.DetachKeys
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}
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return execConfig, nil
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}
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