保持 Ansible DRY:如何避免重复变量? [英] Keep Ansible DRY: How to avoid repeating variables?

问题描述

最近刚开始使用 Ansible，但遇到了一个问题.在我的 YAML 结构之一中，我定义了如下内容:

Recently just started using Ansible and I have run into a problem. In one of my YAML structures I have defined something like this:

---
# file: main.yml
#
# Jenkins variables for installation and configuration

jenkins:
  debian:
    # Debian repository containing Jenkins and the associated key for accessing the repository
    repo: 'deb http://pkg.jenkins-ci.org/debian binary/'
    repo_key: 'http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key'

    # Dependencies needed for Jenkins to run properly
    dependencies:
      - 'openjdk-7-jdk'
      - 'git-core'
      - 'curl'

  port: 8080

  # Installation directory
  home: '/opt/jenkins'

  # Path to the location of the main Jenkins-cli binary
  bin_path: '{{jenkins.home}}/jenkins-cli.jar'

  # Path to the location of the Jenkins updates file
  updates_path: '{{jenkins.home}}/updates_jenkins.json'

Ansible 在特定任务中给了我这样的错误:

Ansible gives me an error like this from a specific task:

"在模板字符串中检测到递归循环:{{jenkins.home}}/updates_jenkins.json"

"recursive loop detected in template string: {{jenkins.home}}/updates_jenkins.json"

我已经将问题缩小到 bin_path 和 updates_path 都指的是家"这一事实.有没有解决的办法?我需要多次定义/opt/jenkins"，这有点糟糕.

I've narrowed it down to the problem being with the fact bin_path and updates_path both refer to 'home'. Is there a way around this? It kind of sucks that I would need to define '/opt/jenkins' multiple times.

推荐答案

据我所知，这是 jinja2 变量的限制.它使用旧的 ${} 并且从 1.4 开始就坏了.我不确定他们是否在 1.5 中修复了这个问题.

As far as I know that this is a limitation of jinja2 variables. it was working with the old ${} and broke since 1.4. I am not sure if they fixed that in 1.5.

我的临时解决方案是从jenkins"中移除家

My temp solution would be removing home from the "jenkins"

---
# file: main.yml
#
# Jenkins variables for installation and configuration

# Installation directory
jenkins_home: '/opt/jenkins'
jenkins:
  debian:
    # Debian repository containing Jenkins and the associated key for accessing the repository
    repo: 'deb http://pkg.jenkins-ci.org/debian binary/'
    repo_key: 'http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key'

    # Dependencies needed for Jenkins to run properly
    dependencies:
      - 'openjdk-7-jdk'
      - 'git-core'
      - 'curl'

  port: 8080



  # Path to the location of the main Jenkins-cli binary
  bin_path: '{{jenkins_home}}/jenkins-cli.jar'

  # Path to the location of the Jenkins updates file
  updates_path: '{{jenkins_home}}/updates_jenkins.json'

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