Config file workflow management

internal/cli/root/root.go

@@ -2,7 +2,10 @@ package root
 
 import (
 	"github.com/alecthomas/kingpin"
-	"github.com/openobservatory/gooni/internal/util"
+	"github.com/apex/log"
+	"github.com/apex/log/handlers/cli"
+	ooni "github.com/openobservatory/gooni"
+	"github.com/prometheus/common/version"
 )
 
 // Cmd is the root command
@@ -11,9 +14,37 @@ var Cmd = kingpin.New("ooni", "")
 // Command is syntax sugar for defining sub-commands
 var Command = Cmd.Command
 
+// Init should be called by all subcommand that care to have a ooni.OONI instance
+var Init func() (*ooni.Config, *ooni.OONI, error)
+
 func init() {
+	configPath := Cmd.Flag("config", "Set a custom config file path").Short('c').String()
+	verbose := Cmd.Flag("verbose", "Enable verbose log output.").Short('v').Bool()
+
 	Cmd.PreAction(func(ctx *kingpin.ParseContext) error {
-		util.Log("Running pre-action")
+		log.SetHandler(cli.Default)
+		if *verbose {
+			log.SetLevel(log.DebugLevel)
+			log.Debugf("ooni version %s", version.Version)
+		}
+
+		Init = func() (*ooni.Config, *ooni.OONI, error) {
+			var c *ooni.Config
+			var err error
+
+			if *configPath != "" {
+				c, err = ooni.ReadConfig(*configPath)
+			} else {
+				c, err = ooni.ReadDefaultConfigPaths()
+			}
+			if err != nil {
+				return nil, nil, err
+			}
+			o := ooni.New(c)
+			o.Init()
+			return c, o, nil
+		}
+
 		return nil
 	})
 }