Add a password STDIN option to registry login

README.md

@@ -214,11 +214,15 @@ After the installation has completed in a later step, you will need to create DN
 
 ofc-bootstrap has a command to generate the registry auth file in the correct format.
 
-If you are using Dockerhub you only need to supply your `--username` and `--password`.
+If you are using Dockerhub you only need to supply your `--username` and `--password-stdin` (or `--password`, but this leaves the password in history).
 ```sh
-ofc-bootstrap registry-login --username <your-registry-username> --password <your-registry-password>
+
+ofc-bootstrap registry-login --username <your-registry-username> --password-stdin
+(the enter your password and hit return)
 ```
 
+You could also have you password in a file, or environment variable and echo/cat this instead of entering interactively
+
 If you are using a different registry (that is not ECR) then also provide a `--server` as well.
 
 

cmd/registry_login.go

@@ -9,15 +9,17 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
 )
 
 func init() {
 	rootCommand.AddCommand(registryLoginCommand)
 	registryLoginCommand.Flags().String("server", "https://index.docker.io/v1/", "The server URL, it is defaulted to the docker registry")
 	registryLoginCommand.Flags().String("username", "", "The Registry Username")
 	registryLoginCommand.Flags().String("password", "", "The registry password")
+	registryLoginCommand.Flags().BoolP("password-stdin", "s", false, "Reads the gateway password from stdin")
 
-	registryLoginCommand.Flags().Bool("ecr", false, "If we are using ECR we need a different set of flags, so if this is set, we need to set --username and --password-stdin")
+	registryLoginCommand.Flags().Bool("ecr", false, "If we are using ECR we need a different set of flags, so if this is set, we need to set --username and --password")
 	registryLoginCommand.Flags().String("account-id", "", "Your AWS Account id")
 	registryLoginCommand.Flags().String("region", "", "Your AWS region")
 }
@@ -36,11 +38,20 @@ func generateRegistryAuthFile(command *cobra.Command, _ []string) error {
 	username, _ := command.Flags().GetString("username")
 	password, _ := command.Flags().GetString("password")
 	server, _ := command.Flags().GetString("server")
+	passStdIn, _ := command.Flags().GetBool("password-stdin")
 
 	if ecrEnabled {
 		return generateECRFile(accountID, region)
 	} else {
-		return generateFile(username, password, server)
+		if passStdIn {
+			passwordStdin, err := ioutil.ReadAll(os.Stdin)
+			if err != nil {
+				return err
+			}
+			return generateFile(username, strings.TrimSpace(string(passwordStdin)), server)
+		} else {
+			return generateFile(username, password, server)
+		}
 	}
 }