Implement rancherctl config get

cmd/control/config.go

@@ -3,8 +3,10 @@ package control
 import (
 	"fmt"
 	"io/ioutil"
+	"strings"
 
 	log "github.com/Sirupsen/logrus"
+	"gopkg.in/yaml.v2"
 
 	"github.com/codegangsta/cli"
 	"github.com/rancherio/os/config"
@@ -16,6 +18,7 @@ func configSubcommands() []cli.Command {
 		{
 			Name:   "get",
 			Usage:  "get value",
+			Action: configGet,
 		},
 		{
 			Name:  "import",
@@ -39,12 +42,53 @@ func configSubcommands() []cli.Command {
 	}
 }
 
+func configGet(c *cli.Context) {
+	cfg, err := config.LoadConfig()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	content, err := cfg.Dump()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	data := make(map[interface{}]interface{})
+	yaml.Unmarshal([]byte(content), data)
+
+	arg := c.Args().Get(0)
+	if arg == "" {
+		fmt.Println("")
+		return
+	}
+
+	parts := strings.Split(arg, ".")
+	for i, part := range parts {
+		if val, ok := data[part]; ok {
+			if i+1 == len(parts) {
+				fmt.Println(val)
+			} else {
+				if newData, ok := val.(map[interface{}]interface{}); ok {
+					data = newData
+				} else {
+					fmt.Println(val)
+					break
+				}
+			}
+		} else {
+			fmt.Println("2")
+			break
+		}
+	}
+}
+
 func configSave(c *cli.Context) {
 	cfg, err := config.LoadConfig()
 	if err != nil {
 		log.Fatal(err)
 	}
 
+	//TODO: why doesn't this work
 	for _, c := range cfg.SystemContainers {
 		container := docker.NewContainer("", &c)
 		if container.Err != nil {