Change env prefix for something for related to katafygio

While it's still time (passing config using environment variable wasn't
documented yet !).

Author: bpineau

README.md

@@ -57,6 +57,17 @@ Flags:
   -i, --resync-interval int          Resync interval in seconds (0 to disable) (default 300)
 ```
 
+## Config file and env variables
+
+All settings can be passed by cli, or environment variable, or in a yaml configuration file
+(thanks to Viper and Cobra libs). The environment are the same as cli options, in uppercase,
+prefixed by "KF", and with underscore instead of dashs. ie.:
+
+```
+export KF_GIT_URL=https://user:[email protected]/myorg/myrepos.git
+export KF_LOCAL_DIR=/tmp/kfdump
+```
+
 ## Build
 
 Assuming you have go 1.10 and glide in the path, and GOPATH configured:

cmd/execute.go

@@ -48,7 +48,7 @@ var (
 	RootCmd = &cobra.Command{
 		Use:   appName,
 		Short: "Backup Kubernetes cluster as yaml files",
-		Long:  "Backup Kubernetes cluster as yaml files",
+		Long:  "Backup Kubernetes cluster as yaml files in a git repository",
 
 		RunE: func(cmd *cobra.Command, args []string) error {
 			conf := &config.KdnConfig{
@@ -64,7 +64,7 @@ var (
 			}
 			err := conf.Init(viper.GetString("api-server"), viper.GetString("kube-config"))
 			if err != nil {
-				return fmt.Errorf("Failed to initialize the configuration: %+v", err)
+				return fmt.Errorf("Failed to initialize the configuration: %v", err)
 			}
 			run.Run(conf)
 			return nil
@@ -150,7 +150,7 @@ func initConfig() {
 	}
 
 	// allow config params through prefixed env variables
-	viper.SetEnvPrefix("KB")
+	viper.SetEnvPrefix("KF")
 	replacer := strings.NewReplacer("-", "_", ".", "_DOT_")
 	viper.SetEnvKeyReplacer(replacer)
 	viper.AutomaticEnv()