commands: add version command

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

commands/root.go

@@ -34,6 +34,7 @@ func addCommands(cmd *cobra.Command, dockerCli command.Cli) {
 		stopCmd(dockerCli),
 		installCmd(dockerCli),
 		uninstallCmd(dockerCli),
+		versionCmd(dockerCli),
 		imagetoolscmd.RootCmd(dockerCli),
 	)
 }

commands/version.go

@@ -0,0 +1,27 @@
+package commands
+
+import (
+	"fmt"
+
+	"github.com/docker/cli/cli"
+	"github.com/docker/cli/cli/command"
+	"github.com/spf13/cobra"
+	"github.com/tonistiigi/buildx/version"
+)
+
+func runVersion(dockerCli command.Cli) error {
+	fmt.Println(version.Package, version.Version, version.Revision)
+	return nil
+}
+
+func versionCmd(dockerCli command.Cli) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "version",
+		Short: "Show buildx version information ",
+		Args:  cli.ExactArgs(0),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return runVersion(dockerCli)
+		},
+	}
+	return cmd
+}