[v2] Add component spec command to validate component specifications

internal/pkg/agent/cmd/common.go

@@ -67,6 +67,7 @@ func NewCommandWithArgs(args []string, streams *cli.IOStreams) *cobra.Command {
 	cmd.AddCommand(newContainerCommand(args, streams))
 	cmd.AddCommand(newStatusCommand(args, streams))
 	cmd.AddCommand(newDiagnosticsCommand(args, streams))
+	cmd.AddCommand(newComponentCommandWithArgs(args, streams))
 
 	// windows special hidden sub-command (only added on windows)
 	reexec := newReExecWindowsCommand(args, streams)

internal/pkg/agent/cmd/component.go

@@ -0,0 +1,23 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package cmd
+
+import (
+	"github.com/spf13/cobra"
+
+	"github.com/elastic/elastic-agent/internal/pkg/cli"
+)
+
+func newComponentCommandWithArgs(args []string, streams *cli.IOStreams) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "component <subcommand>",
+		Short: "Tools to work on components",
+		Long:  "Tools for viewing current component information and developing new components for Elastic Agent",
+	}
+
+	cmd.AddCommand(newComponentSpecCommandWithArgs(args, streams))
+
+	return cmd
+}

internal/pkg/agent/cmd/component_spec.go

@@ -0,0 +1,39 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+
+	"github.com/spf13/cobra"
+
+	"github.com/elastic/elastic-agent/pkg/component"
+
+	"github.com/elastic/elastic-agent/internal/pkg/cli"
+)
+
+func newComponentSpecCommandWithArgs(_ []string, streams *cli.IOStreams) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "spec [file]",
+		Short: "Validates a component specification",
+		Long:  "Validates a component specification that instructs the Elastic Agent how it should be ran.",
+		Args:  cobra.ExactArgs(1),
+		RunE: func(c *cobra.Command, args []string) error {
+			data, err := ioutil.ReadFile(args[0])
+			if err != nil {
+				return err
+			}
+			_, err = component.LoadSpec(data)
+			if err != nil {
+				return err
+			}
+			fmt.Fprintln(streams.Out, "Component specification is valid")
+			return nil
+		},
+	}
+
+	return cmd
+}