GitLab CI secret variables for Gradle publish

Question

How to setup Gradle publish task user credentials with GitLab CI secret variables? I am using gradle maven publish plugin, and here is snippet from build.gradle

repositories {
    maven {
      credentials {
        username artifactUser
        password artifactPass
      }
      url "..."
    }
  }

I've tried to use gradle.properties as below

artifactUser=${env.MAVEN_REPO_USER}
artifactPass=${env.MAVEN_REPO_PASS}

And several ways of accessing secret variables in .gitlab-ci.yml file (because gradle.properties is not picked up from gradle or variables are not transformed correctly, it is in root project dir)

Method 1

'./gradlew publish -x test -PartifactUser=${env.MAVEN_REPO_USER} -PartifactPass=${env.MAVEN_REPO_PASS}'

Error: /bin/bash: line 56: -PartifactUser=${env.MAVEN_REPO_USER}: bad substitution

Method 2

    before_script:
      - chmod +x ./gradlew
      - export REPO_USER=${env.MAVEN_REPO_USER}
      - export REPO_PASS=${env.MAVEN_REPO_PASS}
    ...
    deploy:
  stage: deploy
  script:
    - ./gradlew publish -x test -PartifactUser=$REPO_USER -PartifactPass=$REPO_PASS

I am using openjdk:8-jdk-slim image for build using gradle wrapper. Seems like there are several issues with this kind of variable usage, do we have any workaround?

Answer 1

You don't need env. prefinx in your .gitlab-ci.yml. You don't need to re-export the variables as well.

If you have defined a variables named MAVEN_REPO_USER and MAVEN_REPO_PASS in Gitlab CI/CD settings for the project, you can just use them in Gradle script:

repositories {
    maven {
        credentials {
            username System.getenv("MAVEN_REPO_USER")
            password System.getenv("MAVEN_REPO_PASS")
        }
        url "…"
    }
}