feat: add the ability to log into a registry on a per-app basis

Closes #5324

plugins/registry/subcommands.go

@@ -12,7 +12,7 @@ import (
 )
 
 // CommandLogin logs a user into the specified server
-func CommandLogin(server string, username string, password string, passwordStdin bool) error {
+func CommandLogin(appName string, server string, username string, password string, passwordStdin bool) error {
 	if passwordStdin {
 		stdin, err := io.ReadAll(os.Stdin)
 		if err != nil {
@@ -39,9 +39,22 @@ func CommandLogin(server string, username string, password string, passwordStdin
 	buffer := bytes.Buffer{}
 	buffer.Write([]byte(password + "\n"))
 
+	env := map[string]string{}
+	if appName != "" {
+		if err := common.VerifyAppName(appName); err != nil {
+			return err
+		}
+		configDir := GetAppRegistryConfigDir(appName)
+		if err := os.MkdirAll(configDir, 0700); err != nil {
+			return fmt.Errorf("Unable to create registry config directory: %w", err)
+		}
+		env["DOCKER_CONFIG"] = GetAppRegistryConfigPath(appName)
+	}
+
 	result, err := common.CallExecCommand(common.ExecCommandInput{
 		Command:     common.DockerBin(),
 		Args:        []string{"login", "--username", username, "--password-stdin", server},
+		Env:         env,
 		Stdin:       &buffer,
 		StreamStdio: true,
 	})
@@ -52,6 +65,7 @@ func CommandLogin(server string, username string, password string, passwordStdin
 		return fmt.Errorf("Unable to run docker login: %s", result.StderrContents())
 	}
 
+	// todo: change the signature of the trigger to include the app name
 	_, err = common.CallPlugnTrigger(common.PlugnTriggerInput{
 		Trigger:     "post-registry-login",
 		Args:        []string{server, username},
@@ -67,6 +81,44 @@ func CommandLogin(server string, username string, password string, passwordStdin
 	return nil
 }
 
+// CommandLogout logs a user out from the specified server
+func CommandLogout(appName string, server string) error {
+	if server == "" {
+		return errors.New("Missing server argument")
+	}
+
+	if server == "hub.docker.com" || server == "docker.com" {
+		server = "docker.io"
+	}
+
+	env := map[string]string{}
+	if appName != "" {
+		if err := common.VerifyAppName(appName); err != nil {
+			return err
+		}
+		configDir := GetAppRegistryConfigDir(appName)
+		if !common.DirectoryExists(configDir) {
+			return fmt.Errorf("No registry credentials found for app %s", appName)
+		}
+		env["DOCKER_CONFIG"] = GetAppRegistryConfigPath(appName)
+	}
+
+	result, err := common.CallExecCommand(common.ExecCommandInput{
+		Command:     common.DockerBin(),
+		Args:        []string{"logout", server},
+		Env:         env,
+		StreamStdio: true,
+	})
+	if err != nil {
+		return fmt.Errorf("Unable to run docker logout: %w", err)
+	}
+	if result.ExitCode != 0 {
+		return fmt.Errorf("Unable to run docker logout: %s", result.StderrContents())
+	}
+
+	return nil
+}
+
 // CommandReport displays a registry report for one or more apps
 func CommandReport(appName string, format string, infoFlag string) error {
 	if len(appName) == 0 {