Add compose exec command

Signed-off-by: aiordache <anca.iordache@docker.com>

cli/cmd/compose/compose.go

@@ -117,6 +117,7 @@ func Command(contextType string) *cobra.Command {
 		killCommand(&opts),
 		runCommand(&opts),
 		removeCommand(&opts),
+		execCommand(&opts),
 	)
 
 	if contextType == store.LocalContextType || contextType == store.DefaultContextType {

cli/cmd/compose/exec.go

@@ -0,0 +1,118 @@
+/*
+   Copyright 2020 Docker Compose CLI 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 compose
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/containerd/console"
+	"github.com/spf13/cobra"
+
+	"github.com/docker/compose-cli/api/client"
+	"github.com/docker/compose-cli/api/compose"
+)
+
+type execOpts struct {
+	*composeOptions
+
+	service     string
+	command     []string
+	environment []string
+	workingDir  string
+
+	tty        bool
+	user       string
+	detach     bool
+	index      int
+	privileged bool
+}
+
+func execCommand(p *projectOptions) *cobra.Command {
+	opts := execOpts{
+		composeOptions: &composeOptions{
+			projectOptions: p,
+		},
+	}
+	runCmd := &cobra.Command{
+		Use:   "exec [options] [-e KEY=VAL...] [--] SERVICE COMMAND [ARGS...]",
+		Short: "Execute a command in a running container.",
+		Args:  cobra.MinimumNArgs(2),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) > 1 {
+				opts.command = args[1:]
+			}
+			opts.service = args[0]
+			return runExec(cmd.Context(), opts)
+		},
+	}
+
+	runCmd.Flags().BoolVarP(&opts.detach, "detach", "d", false, "Detached mode: Run command in the background.")
+	runCmd.Flags().StringArrayVarP(&opts.environment, "env", "e", []string{}, "Set environment variables")
+	runCmd.Flags().IntVar(&opts.index, "index", 1, "index of the container if there are multiple instances of a service [default: 1].")
+	runCmd.Flags().BoolVarP(&opts.privileged, "privileged", "", false, "Give extended privileges to the process.")
+	runCmd.Flags().StringVarP(&opts.user, "user", "u", "", "Run the command as this user.")
+	runCmd.Flags().BoolVarP(&opts.tty, "", "T", false, "Disable pseudo-tty allocation. By default `docker compose exec` allocates a TTY.")
+	runCmd.Flags().StringVarP(&opts.workingDir, "workdir", "w", "", "Path to workdir directory for this command.")
+
+	runCmd.Flags().SetInterspersed(false)
+	return runCmd
+}
+
+func runExec(ctx context.Context, opts execOpts) error {
+	c, err := client.NewWithDefaultLocalBackend(ctx)
+	if err != nil {
+		return err
+	}
+
+	project, err := opts.toProject(nil)
+	if err != nil {
+		return err
+	}
+
+	execOpts := compose.RunOptions{
+		Service:     opts.service,
+		Command:     opts.command,
+		Environment: opts.environment,
+		Tty:         !opts.tty,
+		User:        opts.user,
+		Privileged:  opts.privileged,
+		Index:       opts.index,
+		Detach:      opts.detach,
+		WorkingDir:  opts.workingDir,
+
+		Writer: os.Stdout,
+		Reader: os.Stdin,
+	}
+
+	if execOpts.Tty {
+		con := console.Current()
+		if err := con.SetRaw(); err != nil {
+			return err
+		}
+		defer func() {
+			if err := con.Reset(); err != nil {
+				fmt.Println("Unable to close the console")
+			}
+		}()
+
+		execOpts.Writer = con
+		execOpts.Reader = con
+	}
+	return c.ComposeService().Exec(ctx, project, execOpts)
+}

cli/main.go

@@ -158,6 +158,8 @@ func main() {
 	opts.AddConfigFlags(flags)
 	flags.BoolVarP(&opts.Version, "version", "v", false, "Print version information and quit")
 
+	flags.SetInterspersed(false)
+
 	walk(root, func(c *cobra.Command) {
 		c.Flags().BoolP("help", "h", false, "Help for "+c.Name())
 	})