Jenkinsfile 用户名和密码凭据无法传递给 Packer

问：

我有 Jenkins 版本 2.401.3 打包器 1.9.4

下面是我的 Jenkinsfile

pipeline {
  agent any 
  environment {
      AWS_CRED     = credentials('AWS_SECRET')
  }
  stages {
    stage('Packer - Build Ubuntu Image on AWS') {
      steps {
        sh ''' 
        #!/bin/bash
        packer validate ubuntu-aws.json
        packer build -var access_key=$AWS_CRED_USR -var secret_key=$AWS_CRED_PSW ubuntu-aws.json
        '''
      }
    }
  }
}

我很难传递凭据。 错误：NoCredentialProviders：链中没有有效的提供程序。荒废的。 有关详细的消息收发，请参阅 aws。Config.CredentialsChainVerboseErrors

错误显示凭据不匹配，但我认为这不是由 Jenkins 凭据引起的，因为我可以回显用户名和密码。

{ 

  "variables": {
    "aws_access_key": "",
    "aws_secret_key": "",
    "region": "ap-southeast-1",
    "instance_type": "t2.micro"
  },
  "builders": [
    {
      "type": "amazon-ebs",
      "access_key": "{{user `aws_access_key` }}",
      "secret_key": "{{user `aws_secret_key` }}",
      "region": "{{user `region` }}",
      "source_ami_filter": {
        "filters": {
          "virtualization-type": "hvm",
          "name": "ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*",
          "root-device-type": "ebs"
        },
        "owners": ["099720109477"], 
        "most_recent": true
      },
      "instance_type": "{{user `instance_type`}}",
      "ssh_username": "{{user `ssh_username`}}",
      "ami_name": "packer-base-{{timestamp}}",
      "subnet_id": "subnet-0eb53daf294979531",
      "associate_public_ip_address": true,
      "user_data_file":"./defaults.cfg"
    }
  ],

我的打包器代码片段。

从 Jenkinsfile 凭证传递的正确方法是什么file 凭证> Packer > AWSCLI 验证