是否阻止了它们内部的 ansible 支持条件

Question

我想知道ansible是否支持以下场景：

block 有 when 条件。
块内的任务再次有进一步的条件 (when)。

下面是我目前的main.yml来说明：

- block:
        
    - name: task 1  
      shell: check_install
      when: ansible_distribution == 'CentOS'
        
    - name: task 2
      shell: echo "test task"
      when: out.rc > "0" #assuming **out** is registered above
        
  become: true
  when: sw_install|default(False) == True

根据 ansible 文档，

Most of what you can apply to a single task (with the exception of loops) can be applied at the block level, which also makes it much easier to set data or directives common to the tasks. This does not mean the directive affects the block itself, but is inherited by the tasks enclosed by a block. i.e. a when will be applied to the tasks, not the block itself.

所以基本问题是：如果我运行一个带有上述任务的剧本，条件流是如何解释的？它运行像 and 条件吗？

类似于：

run task 1  when: block conditional & task one conditional satisfies 

run task 2  when: block conditional & task two conditional satisfies

Answer 1

向块添加条件与向块内的每个任务添加相同条件完全相同。

如果您有一个块级别的条件和另一个任务级别的条件，它们都将在任务运行时间进行评估。

这也意味着，如果您的任务之一在运行期间更改了阻止条件，则每次都会重新评估。举个例子：

- name: Set a block condition true
  set_fact:
    block_condition: true

- name: Set a task condition true
  set_fact:
    task_condition: true

- block:
    - name: Write a message
      debug:
        msg: Block and task conditions are true
      when: task_condition | bool
    
    - name: Change condition
      set_fact:
        block_condition: false

    - name: Write a message
      debug:
        msg: Block condition is true
  
  when: block_condition | bool

在这种情况下，块的最后一个任务将被跳过，因为 block_condition 将在运行时评估为 false。

是否阻止了它们内部的 ansible 支持条件

Does block in ansible support conditionals inside them

ansible

ansible-2.x