bash - 在ansible中检查shell命令的输出

Question

我正在尝试编写一个运行 shell 管道的 Ansible 脚本，并根据该管道的输出确定是否终止剧本的执行。

这是有问题的代码:

  - name: Check if the number of HITACHI devices is equal to 1
    shell: lsscsi | grep HITACHI | awk '{print $6}' | wc -l
    register: numOfDevices
    when: numOfDevices|int  == 1

这是错误:

{  
   "failed":true,
   "msg":"The conditional check 'numOfDevices|int  == 1' failed.  
The error was: error while evaluating conditional (numOfDevices|int  == 1): 'numOfDevices' is undefined\n\nThe error appears to have been in '/etc/ansible/config/test.yml': line 14, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n  - name: Check if the number of HITACHI devices is equal to 1\n    ^ here\n"
}

有人可以告诉我可能是什么问题吗？

Answer 1

考虑在你的 shell 命令中进行比较:

  - name: Check if the number of HITACHI devices is equal to 1
    shell: test "$(lsscsi | awk '/HITACHI/ { count++ } END { print count }')" -eq 1

您不需要使用 register在这里，因为默认 failedWhen当命令的退出状态为非零时。

如果您 做了 想用 register ， 然而:

  - name: Check if the number of HITACHI devices is equal to 1
    shell: lsscsi | awk '/HITACHI/ { count++ } END { print count }'
    register: countHitachiDevices
    failed_when: int(countHitachiDevices.stdout) != 1 

注意 failed_when的使用而不是 when : A when子句确定是否要运行命令，而 failed_when子句确定该命令是否被确定为失败。