Add docker prune command and ACI implementation

Signed-off-by: Guillaume Tardif <guillaume.tardif@docker.com>

cli/cmd/prune.go

@@ -0,0 +1,69 @@
+/*
+   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 cmd
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+
+	"github.com/docker/compose-cli/api/client"
+	"github.com/docker/compose-cli/api/resources"
+)
+
+type pruneOpts struct {
+	force  bool
+	dryRun bool
+}
+
+// PruneCommand deletes backend resources
+func PruneCommand() *cobra.Command {
+	var opts pruneOpts
+	cmd := &cobra.Command{
+		Use:   "prune",
+		Short: "prune existing resources in current context",
+		Args:  cobra.MaximumNArgs(0),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runPrune(cmd.Context(), opts)
+		},
+	}
+
+	cmd.Flags().BoolVar(&opts.force, "force", false, "Also prune running containers and Compose applications")
+	cmd.Flags().BoolVar(&opts.dryRun, "dry-run", false, "List resources to be deleted, but do not delete them")
+
+	return cmd
+}
+
+func runPrune(ctx context.Context, opts pruneOpts) error {
+	c, err := client.New(ctx)
+	if err != nil {
+		return errors.Wrap(err, "cannot connect to backend")
+	}
+
+	ids, err := c.ResourceService().Prune(ctx, resources.PruneRequest{Force: opts.force, DryRun: opts.dryRun})
+	if opts.dryRun {
+		fmt.Println("resources that would be deleted:")
+	} else {
+		fmt.Println("deleted resources:")
+	}
+	for _, id := range ids {
+		fmt.Println(id)
+	}
+	return err
+}

cli/main.go

@@ -122,6 +122,7 @@ func main() {
 		cmd.StopCommand(),
 		cmd.KillCommand(),
 		cmd.SecretCommand(),
+		cmd.PruneCommand(),
 
 		// Place holders
 		cmd.EcsCommand(),