Ansible lineinfile复制行 [英] Ansible lineinfile duplicates line

问题描述

我在/etc/foo.txt有一个简单的文件.该文件包含以下内容:

I have a simple file at /etc/foo.txt. The file contains the following:

#bar

我有以下有趣的剧本任务来取消上面的注释:

I have the following ansible playbook task to uncomment the line above:

- name: test lineinfile
  lineinfile: backup=yes state=present dest=/etc/foo.txt
              regexp='^#bar'
              line='bar'

当我第一次运行ansible-playbook时，该行未注释，并且/etc/foo.txt现在包含以下内容:

When I first run ansible-playbook, the line gets uncommented and the /etc/foo.txt now contains the following:

bar

但是，如果我再次运行ansible-playbook，则会得到以下信息:

However, if I run ansible-playbook again, I get the following:

bar
bar

如果我再次运行它，那么/etc/foo.txt文件将如下所示:

If I run it yet again, then the /etc/foo.txt file will look like this:

bar
bar
bar

如何避免重复出现这些行?我只想取消对"#bar"的注释并完成它.

How to avoid this duplications of lines? I just want to uncomment the '#bar' and be done with it.

推荐答案

问题是任务的正则表达式仅与注释的行#bar相匹配.为了具有幂等性，lineinfile任务需要匹配行的已注释的和未注释状态.这样，它将取消注释#bar，但将不变地通过bar.

The problem is the task's regex only matches the commented out line, #bar. To be idempotent, the lineinfile task needs to match both the commented and uncommented state of the line. This way it will uncomment #bar but will pass bar unchanged.

此任务应执行您想要的操作:

This task should do what you want:

- name: test lineinfile
  lineinfile: 
    backup=yes
    state=present
    dest=/etc/foo.txt
    regexp='^#?bar'
    line='bar'

请注意，唯一的变化是添加了?"到正则表达式.

Note the only change was adding a "?" to the regex.

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