add basic config struct to libkpod

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

cmd/kpod/common.go

@@ -3,6 +3,7 @@ package main
 import (
 	is "github.com/containers/image/storage"
 	"github.com/containers/storage"
+	"github.com/kubernetes-incubator/cri-o/libkpod"
 	"github.com/urfave/cli"
 )
 
@@ -31,3 +32,30 @@ func getStore(c *cli.Context) (storage.Store, error) {
 	is.Transport.SetStore(store)
 	return store, nil
 }
+
+func getConfig(c *cli.Context) (*libkpod.Config, error) {
+	config := libkpod.DefaultConfig()
+	if c.GlobalIsSet("config") {
+		err := config.FromFile(c.String("config"))
+		if err != nil {
+			return config, err
+		}
+	}
+	if c.GlobalIsSet("root") {
+		config.Root = c.GlobalString("root")
+	}
+	if c.GlobalIsSet("runroot") {
+		config.RunRoot = c.GlobalString("runroot")
+	}
+
+	if c.GlobalIsSet("storage-driver") {
+		config.Storage = c.GlobalString("storage-driver")
+	}
+	if c.GlobalIsSet("storage-opt") {
+		opts := c.GlobalStringSlice("storage-opt")
+		if len(opts) > 0 {
+			config.StorageOptions = opts
+		}
+	}
+	return config, nil
+}

cmd/kpod/main.go

@@ -49,6 +49,10 @@ func main() {
 			Name:  "storage-opt",
 			Usage: "used to pass an option to the storage driver",
 		},
+		cli.StringFlag{
+			Name:  "config, c",
+			Usage: "path of a config file detailing container server configuration options",
+		},
 	}
 	if err := app.Run(os.Args); err != nil {
 		logrus.Fatal(err)