在ansible中如何在文件末尾添加一个文本块，标记前有一个空行？

Question

我有一个如下所示的剧本：

- hosts: localhost
  tasks:
    - name: update a file
      blockinfile:
        dest: /tmp/test
        block: |
          line 1
          line 2

根据运行剧本，文件 /tmp/test 变为：

a # this is the end line of the original file
# BEGIN ANSIBLE MANAGED BLOCK
line 1
line 2
# END ANSIBLE MANAGED BLOCK

为了视觉效果，我想在标记“# BEGIN ANSIBLE MANAGED BLOCK”前加一个空行（换行符），最简单的方法是什么？最好在任务内，但欢迎任何想法。如果我重新定义标记，它将影响“BEGIN”和“END”标记。

Answer 1

如果您使用的是 Ansible 2.5 或更高版本，您可以更改 marker, marker_begin and marker_end.

这是一个示例剧本：

- hosts: all
  gather_facts: no

  tasks:
    - blockinfile:
        dest: /tmp/test
        marker: '{mark} ANSIBLE MANAGED BLOCK'
        marker_begin: '\n# BEGIN' 
        marker_end: '# END'
        block: |
          line 1
          line 2

这产生了回顾：

PLAY [all] ********************************************************************************************************

TASK [blockinfile] ************************************************************************************************
changed: [localhost]

PLAY RECAP ********************************************************************************************************
localhost                  : ok=1    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

文件 /tmp/test 最终为：

a
 
# BEGIN ANSIBLE MANAGED BLOCK
line 1
line 2
# END ANSIBLE MANAGED BLOCK

Answer 2

使用lineinfile。例如

- hosts: localhost
  tasks:
    - name: update a file
      blockinfile:
        dest: /tmp/test
        block: |
          line 1
          line 2
    - name: insert empty line before the marker
      lineinfile:
        dest: /tmp/test
        insertbefore: '^# BEGIN ANSIBLE MANAGED BLOCK$'
        line: ''

不幸的是，insertbefore 不适用于更多块。模板如果您坚持块之间有空行，则可能需要模块。

试试下面的剧本。不幸的是，EOF 没有按预期工作

shell> cat manage-block.yml
- name: "insert {{ my_marker }} in {{ my_dest }}"
  blockinfile:
    dest: "{{ my_dest }}"
    marker: "# {mark} ANSIBLE MANAGED BLOCK {{ my_marker }}"
    block: "{{ my_block }}"
- name: "insert empty line before {{ my_marker }}"
  lineinfile:
    dest: "{{ my_dest }}"
    insertbefore: '^# BEGIN ANSIBLE MANAGED BLOCK {{ my_marker }}'
    line: 'empty line'
  when: ansible_loop.first
- name: "insert empty line after EOF"
  lineinfile:
    dest: "{{ my_dest }}"
    insertafter: EOF
    line: 'empty line'

- hosts: localhost
  vars:
    my_blocks:
      /tmp/test:
        - my_marker: block001
          my_block: |
            line 1
            line 2
        - my_marker: block002
          my_block: |
            line 3
            line 4
  tasks:
    - include_tasks: manage-block.yml
      with_subelements:
        - "{{ my_blocks|dict2items }}"
        - value
      loop_control:
          extended: true
      vars:
        my_dest: "{{ item.0.key }}"
        my_marker: "{{ item.1.my_marker }}"
        my_block: "{{ item.1.my_block }}"

Answer 3

下面在pattern前加一个空行，是幂等的，当pattern不存在时不在文件末尾添加。

- hosts: localhost
  gather_facts: no
  tasks:
    - name: update a file
      replace:
        dest: /tmp/foobar
        regexp: '(?smx) (?<!\n\n) ^ (foobar)$'
        replace: "\n\1"

在ansible中如何在文件末尾添加一个文本块，标记前有一个空行？

In ansible how to add a block of text at end of a file with a blank line before the marker?

ansible

ansible-2.x