Add backend-metadata command (hidden) for CLI backend

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

cli/cmd/metadata.go

@@ -0,0 +1,57 @@
+/*
+   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 (
+	"encoding/json"
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/docker/compose-cli/internal"
+)
+
+// BackendMetadata backend metadata
+// TODO import this from cli when merged & available in /docker/cli
+type BackendMetadata struct {
+	Name    string
+	Version string
+}
+
+// MetadataCommand command to display version
+func MetadataCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:    "backend-metadata",
+		Short:  "return CLI backend metadata",
+		Args:   cobra.MaximumNArgs(0),
+		Hidden: true,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			metadata := BackendMetadata{
+				Name:    "Cloud integration",
+				Version: internal.Version,
+			}
+			jsonMeta, err := json.Marshal(metadata)
+			if err != nil {
+				return err
+			}
+			fmt.Println(string(jsonMeta))
+			return nil
+		},
+	}
+
+	return cmd
+}

cli/main.go

@@ -57,12 +57,13 @@ import (
 
 var (
 	contextAgnosticCommands = map[string]struct{}{
-		"compose": {},
-		"context": {},
-		"login":   {},
-		"logout":  {},
-		"serve":   {},
-		"version": {},
+		"compose":          {},
+		"context":          {},
+		"login":            {},
+		"logout":           {},
+		"serve":            {},
+		"version":          {},
+		"backend-metadata": {},
 	}
 	unknownCommandRegexp = regexp.MustCompile(`unknown command "([^"]*)"`)
 )
@@ -132,6 +133,7 @@ func main() {
 		cmd.KillCommand(),
 		cmd.SecretCommand(),
 		cmd.PruneCommand(),
+		cmd.MetadataCommand(),
 
 		// Place holders
 		cmd.EcsCommand(),

tests/e2e/e2e_test.go

@@ -467,6 +467,15 @@ func TestUnsupportedCommand(t *testing.T) {
 	})
 }
 
+func TestBackendMetadata(t *testing.T) {
+	c := NewParallelE2eCLI(t, binDir)
+
+	t.Run("backend-metadata", func(t *testing.T) {
+		res := c.RunDockerCmd("backend-metadata")
+		res.Assert(t, icmd.Expected{Out: `{"Name":"Cloud integration","Version":"`})
+	})
+}
+
 func TestVersion(t *testing.T) {
 	c := NewParallelE2eCLI(t, binDir)