make runAttach public and allow passing context

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

Author: ndeloof

cli/command/container/attach.go

@@ -17,12 +17,13 @@ import (
 	"github.com/spf13/cobra"
 )
 
-type attachOptions struct {
-	noStdin    bool
-	proxy      bool
-	detachKeys string
+// AttachOptions group options for `attach` command
+type AttachOptions struct {
+	NoStdin    bool
+	Proxy      bool
+	DetachKeys string
 
-	container string
+	Container string
 }
 
 func inspectContainerAndCheckState(ctx context.Context, cli client.APIClient, args string) (*types.ContainerJSON, error) {
@@ -45,15 +46,15 @@ func inspectContainerAndCheckState(ctx context.Context, cli client.APIClient, ar
 
 // NewAttachCommand creates a new cobra.Command for `docker attach`
 func NewAttachCommand(dockerCli command.Cli) *cobra.Command {
-	var opts attachOptions
+	var opts AttachOptions
 
 	cmd := &cobra.Command{
 		Use:   "attach [OPTIONS] CONTAINER",
 		Short: "Attach local standard input, output, and error streams to a running container",
 		Args:  cli.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
-			opts.container = args[0]
-			return runAttach(dockerCli, &opts)
+			opts.Container = args[0]
+			return RunAttach(dockerCli, &opts)
 		},
 		Annotations: map[string]string{
 			"aliases": "docker container attach, docker attach",
@@ -64,36 +65,41 @@ func NewAttachCommand(dockerCli command.Cli) *cobra.Command {
 	}
 
 	flags := cmd.Flags()
-	flags.BoolVar(&opts.noStdin, "no-stdin", false, "Do not attach STDIN")
-	flags.BoolVar(&opts.proxy, "sig-proxy", true, "Proxy all received signals to the process")
-	flags.StringVar(&opts.detachKeys, "detach-keys", "", "Override the key sequence for detaching a container")
+	flags.BoolVar(&opts.NoStdin, "no-stdin", false, "Do not attach STDIN")
+	flags.BoolVar(&opts.Proxy, "sig-proxy", true, "Proxy all received signals to the process")
+	flags.StringVar(&opts.DetachKeys, "detach-keys", "", "Override the key sequence for detaching a container")
 	return cmd
 }
 
-func runAttach(dockerCli command.Cli, opts *attachOptions) error {
-	ctx := context.Background()
+// RunAttach executes an `attach` command
+func RunAttach(dockerCli command.Cli, opts *AttachOptions) error {
+	return RunAttachWithContext(context.Background(), dockerCli, opts)
+}
+
+// RunAttachWithContext executes an `attach` command
+func RunAttachWithContext(ctx context.Context, dockerCli command.Cli, opts *AttachOptions) error {
 	apiClient := dockerCli.Client()
 
 	// request channel to wait for client
-	resultC, errC := apiClient.ContainerWait(ctx, opts.container, "")
+	resultC, errC := apiClient.ContainerWait(ctx, opts.Container, "")
 
-	c, err := inspectContainerAndCheckState(ctx, apiClient, opts.container)
+	c, err := inspectContainerAndCheckState(ctx, apiClient, opts.Container)
 	if err != nil {
 		return err
 	}
 
-	if err := dockerCli.In().CheckTty(!opts.noStdin, c.Config.Tty); err != nil {
+	if err := dockerCli.In().CheckTty(!opts.NoStdin, c.Config.Tty); err != nil {
 		return err
 	}
 
 	detachKeys := dockerCli.ConfigFile().DetachKeys
-	if opts.detachKeys != "" {
-		detachKeys = opts.detachKeys
+	if opts.DetachKeys != "" {
+		detachKeys = opts.DetachKeys
 	}
 
 	options := container.AttachOptions{
 		Stream:     true,
-		Stdin:      !opts.noStdin && c.Config.OpenStdin,
+		Stdin:      !opts.NoStdin && c.Config.OpenStdin,
 		Stdout:     true,
 		Stderr:     true,
 		DetachKeys: detachKeys,
@@ -104,13 +110,13 @@ func runAttach(dockerCli command.Cli, opts *attachOptions) error {
 		in = dockerCli.In()
 	}
 
-	if opts.proxy && !c.Config.Tty {
+	if opts.Proxy && !c.Config.Tty {
 		sigc := notifyAllSignals()
-		go ForwardAllSignals(ctx, dockerCli, opts.container, sigc)
+		go ForwardAllSignals(ctx, dockerCli, opts.Container, sigc)
 		defer signal.StopCatch(sigc)
 	}
 
-	resp, errAttach := apiClient.ContainerAttach(ctx, opts.container, options)
+	resp, errAttach := apiClient.ContainerAttach(ctx, opts.Container, options)
 	if errAttach != nil {
 		return errAttach
 	}
@@ -124,13 +130,13 @@ func runAttach(dockerCli command.Cli, opts *attachOptions) error {
 	// the container and not exit.
 	//
 	// Recheck the container's state to avoid attach block.
-	_, err = inspectContainerAndCheckState(ctx, apiClient, opts.container)
+	_, err = inspectContainerAndCheckState(ctx, apiClient, opts.Container)
 	if err != nil {
 		return err
 	}
 
 	if c.Config.Tty && dockerCli.Out().IsTerminal() {
-		resizeTTY(ctx, dockerCli, opts.container)
+		resizeTTY(ctx, dockerCli, opts.Container)
 	}
 
 	streamer := hijackedIOStreamer{

cli/command/container/exec.go

@@ -97,12 +97,16 @@ func NewExecCommand(dockerCli command.Cli) *cobra.Command {
 
 // RunExec executes an `exec` command
 func RunExec(dockerCli command.Cli, options ExecOptions) error {
+	return RunExecWithContext(context.Background(), dockerCli, options)
+}
+
+// RunExecWithContext executes an `exec` command
+func RunExecWithContext(ctx context.Context, dockerCli command.Cli, options ExecOptions) error {
 	execConfig, err := parseExec(options, dockerCli.ConfigFile())
 	if err != nil {
 		return err
 	}
 
-	ctx := context.Background()
 	client := dockerCli.Client()
 
 	// We need to check the tty _before_ we do the ContainerExecCreate, because