在循环中使用with_items的Ansible 2条件 [英] Ansible 2 conditionals using with_items in loop

问题描述

我试图根据布尔值的存在，根据任务中条件检查的结果来运行一些Ansible命令，并试图将其束缚起来以使其正常工作.

I'm trying to run a few Ansible commands depending on the outcome of a conditional check in my tasks based on the presence of a boolean and am tying myself up in knots trying to get it to work.

期望的结果如下，并且应该为hosts数组中的每个项目运行 :

The desired outcome is as follows, and should be run for each item in the hosts array:

• 检查lynchburg变量是true还是false
• 如果lynchburg变量是true:
  • 设置文件夹结构(如果尚不存在)
  • 从随附的模板文件创建gulpfile.js(如果尚不存在)
  • Check if the lynchburg variable is true or false
  • If the lynchburg variable is true:
    • Setup the folder structure if it doesn't already exist
    • Create gulpfile.js from the included template file if it doesn't already exist
    • 不设置文件夹结构
    • 不要创建gulpfile.js

    从下面包含的代码中，我看到以下结果:

    From the code included below, I'm seeing the following results:

    • 当lynchburg为true时，设置按预期进行 第一次以及以后的任何重新配置​​也可以作为 预期的.
    • 当lynchburg为false时，会创建inc文件夹结构 ，但是不会创建gulpfile.js .
    • When lynchburg is true, the provision runs through as expected the first time around and any subsequent reprovisions also work as expected.
    • When lynchburg is false, the inc folder structure is created, however gulpfile.js isn't.

    任务应运行的主要循环如下:

    The main loop the task should run through is the following:

    vhosts:
      - site_name: sample
        lynchburg: true
    

    ，任务如下:

    # Create variable to check whether Lynchburg has already been installed
    - name: Check if Lynchburg assets folders have been previously created
      stat:
        path: /var/www/{{ item.site_name }}/inc
      with_items: "{{ vhosts }}"
      when: item.lynchburg == true
      register: lynchburg_assets
    
    - name: Check if Lynchburg gulpfile.js has been previously created
      stat:
        path: /var/www/{{ item.site_name }}/gulpfile.js
      with_items: "{{ vhosts }}"
      when: item.lynchburg == true
      register: lynchburg_gulpfile
    
    - name: Create inc folder
      with_items: "{{ lynchburg_assets.results }}"
      file:
        path: /var/www/{{ item.item.site_name }}/inc
        state: directory
      when: item.stat.isdir is undefined and item.item.lynchburg == true
    
    - name: Create scss folder
      with_items: "{{ lynchburg_assets.results }}"
      file:
        path: /var/www/{{ item.item.site_name }}/inc/scss
        state: directory
      when: item.stat.isdir is undefined and item.item.lynchburg == true
    
    - name: Create js folder
      with_items: "{{ lynchburg_assets.results }}"
      file:
        path: /var/www/{{ item.item.site_name }}/inc/js
        state: directory
      when: item.stat.isdir is undefined and item.item.lynchburg == true
    
    - name: Create img folder
      with_items: "{{ lynchburg_assets.results }}"
      file:
        path: /var/www/{{ item.item.site_name }}/inc/img
        state: directory
      when: item.stat.isdir is undefined and item.item.lynchburg == true
    
    - name: Create fonts folder
      with_items: "{{ lynchburg_assets.results }}"
      file:
        path: /var/www/{{ item.item.site_name }}/inc/fonts
        state: directory
      when: item.stat.isdir is undefined and item.item.lynchburg == true
    
    - name: Create gulpfile.js
      with_items: "{{ lynchburg_gulpfile.results }}"
      template:
        src: gulpfile.js
        dest: /var/www/{{ item.item.site_name }}/gulpfile.js
      when: item.stat.exists is defined and item.stat.exists == false and item.item.lynchburg == true
    

    NB 如果还有其他方法可以轻松地创建完整的文件夹结构，而无需运行五个不同的任务-每个文件夹/子文件夹一个-有人可以提出建议，那也将不胜感激！

    N.B. If there's any other way to create the full folder structure easily without running five different tasks - one for each folder/subfolder - and someone could advise what that is, that'd also be appreciated!

    推荐答案

    当lynchburg为false时，会创建inc文件夹结构 ，但是不会创建gulpfile.js .

    When lynchburg is false, the inc folder structure is created, however gulpfile.js isn't.

    我知道如何解决它，但我还不知道如何解释它:

    I know how to solve it, I don't know (yet) how to explain it:

    在条件中更改表达式的顺序:

    Change the order of expressions in the conditional:

    when: item.item.lynchburg == true and item.stat.isdir is undefined
    

    ---

    由于某些原因:

    ---

    For some reason:

    when: dummy.key is undefined and false
    

    和

    when: false and dummy.key is undefined
    

    给出不同的结果.

    仅当检查顶级变量(dummy is undefined)时，它才能按预期工作.

    It works as expected only when checking the top-level variable (dummy is undefined).

    这篇关于在循环中使用with_items的Ansible 2条件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！