Jenkins : use withCredentials in global environment section

Question

I have a Jenkins pipeline with multiple stages that all require the same environment variables, I run this like so:

script {
    withCredentials([usernamePassword(credentialsId: 'COMPOSER_REPO_MAGENTO', passwordVariable: 'MAGE_REPO_PASS', usernameVariable: 'MAGE_REPO_USER')]) {
        def composerAuth = """{
            "http-basic": {
                "repo.magento.com": {
                    "username": "${MAGE_REPO_USER}",
                    "password": "${MAGE_REPO_PASS}"
                }
            }
        }""";
        // do some stuff here that uses composerAuth
    }
}

I don't want to have to re-declare composerAuth every time, so I want to store the credentials in a global variable, so I can do something like:

script {
    // do some stuff here that uses global set composerAuth
}

I've tried putting it in the environment section:

environment {
    DOCKER_IMAGE_NAME = "magento2_website_sibo"
    withCredentials([usernamePassword(credentialsId: 'COMPOSER_REPO_MAGENTO', passwordVariable: 'MAGE_REPO_PASS', usernameVariable: 'MAGE_REPO_USER')]) {
        COMPOSER_AUTH = """{
            "http-basic": {
                "repo.magento.com": {
                    "username": "${MAGE_REPO_USER}",
                    "password": "${MAGE_REPO_PASS}"
                }
            }
        }""";
    }
}

But (groovy noob as I am) that doesn't work. So what's the best approach on setting a globally accessible variable with credentials but only have to declare it once?

Answer 1

You can use credentials helper method of the environment section. For "Username and passwrd" type of credentials it assigns 2 additional environment variables. Example:

environment {
  MAGE_REPO_CREDENTIALS = credentials('COMPOSER_REPO_MAGENTO')
  COMPOSER_AUTH = """{
      "http-basic": {
          "repo.magento.com": {
              "username": "${env.MAGE_REPO_CREDENTIALS_USR}",
              "password": "${env.MAGE_REPO_CREDENTIALS_PSW}"
          }
      }
  }"""
}

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