HACK always as a plugin

cmd/drone-docker/main.go

@@ -287,6 +287,7 @@ func main() {
 		cli.StringFlag{
 			Name:   "plugin-config",
 			Usage:  "path to the plugin config.json. Defaults to config.json",
+			Value:  "config.json",
 			EnvVar: "PLUGIN_PLUGIN_CONFIG",
 		},
 	}
@@ -334,7 +335,7 @@ func run(c *cli.Context) error {
 			Quiet:        c.Bool("quiet"),
 			Platform:     c.String("platform"),
 			SSHAgentKey:  c.String("ssh-agent-key"),
-			IsPlugin:     c.Bool("is-plugin"),
+			IsPlugin:     true, //c.Bool("is-plugin"),
 			PluginConfig: c.String("plugin-config"),
 		},
 		Daemon: docker.Daemon{

docker.go

@@ -199,11 +199,7 @@ func (p Plugin) Exec() error {
 		cmds = append(cmds, exec.Command(dockerExe, "save", "-o", "tmp.tar", p.Build.Name))
 		cmds = append(cmds, exec.Command(dockerExe, "image", "rm", p.Build.Name))
 		cmds = append(cmds, exec.Command("tar", "x", "-C", "plugin/rootfs", "-f", "tmp.tar"))
-		var pluginConfig string = p.Build.PluginConfig
-		if len(pluginConfig) == 0 {
-			pluginConfig = "config.json"
-		}
-		cmds = append(cmds, exec.Command("cp", pluginConfig, "plugin/config.json"))
+		cmds = append(cmds, exec.Command("cp", p.Build.PluginConfig, "plugin/config.json"))
 		cmds = append(cmds, exec.Command(dockerExe, "plugin", "create", p.Build.Repo, "plugin"))
 	}