Ansible 条件始终评估为 false [英] Ansible condition always evaluates to false

问题描述

我正在尝试检查特定字符串的 shell 命令的输出，该字符串指示错误，并且应该终止剧本.

I'm trying to examine the output of a shell command for a particular string which indicates an error, and that the playbook should be terminated.

我正在尝试像这样调试它:

I'm trying to debug it something like this:

- debug: var=foo_result

- debug: msg={{ 'Some error text' in foo_result }}

在这个例子中，install_result 被注册为包含命令的输出，它确实:

In this example, install_result was registered to contain the output of the command, and it does:

TASK: [do_stuff | debug var=foo_result] **************************** 
ok: [some-node] => {
    "foo_result": {
        "changed": true, 
        "msg": "All items completed", 
        "results": [
            {
                "changed": true, 
[Snip..]
                "stderr": "", 
                "stdout": "...Some error text..."
            }
        ]
    }
}

在 foo_result 中检查一些错误文本"的第二个调试语句总是评估为假".

The second debug statement, which checked for "some error text" in foo_result always evaluates to "false".

我仍然发现 Ansible 语法有点混乱，我不确定我在这里做错了什么.

I'm still finding the Ansible syntax a little confusing, I'm not sure what I did wrong here.

Ansible 版本:1.6.10

推荐答案

Ansible 很奇怪.也许我只是没有明白"它......

Ansible is weird. Maybe I'm just not "getting" it...

请注意，在原始输出中，foo_install.results 包含一个具有单个元素的数组.如果你想调试或测试 stdout 的文本，你可以这样做:

Notice in the original output, that foo_install.results contains an array with a single element. If you want to debug or test stdout for text, you can do it this way:

- debug: msg={{ 'My Error' in foo_result.results[0].stdout }}
  when: foo_result.changed

注意我必须添加数组索引符号才能正确打印true".

Notice I had to add array index notation to get this to print "true" properly.

但是如果我这样做:

- name: Do Foo Stuff
  shell: /some/path/to/some/command
  register: foo_result
  failed_when: "'My Error' in foo_result.stdout"

我不需要参考results[0].我不知道这个区别是怎么回事.我不知道为什么访问 foo_result 似乎工作不同，如果我从注册它的同一个任务与不同的任务访问它.

I don't need to refer to results[0]. I don't know what's up with that difference. I don't know why accessing foo_result seems to work differently if I access it from the same task that registered it vs. a different task.

也许这在最近的版本中得到了修复，但这是我在 1.6.10 中需要做的事情

Maybe this is fixed in more recent versions, but this is what I needed to do to get this working in 1.6.10

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