从 bash 命令的命令输出在 Ansible 中设置环境变量

Setting an environment variable in Ansible from a command output of bash command

提问by Spaniard89

I would like to set output of a shell command as an environment variable in Ansible.

我想在 Ansible 中将 shell 命令的输出设置为环境变量。

I did the following to achieve it:

我做了以下事情来实现它：

- name: Copy content of config.json into variable
  shell:  /bin/bash -l -c "cat /storage/config.json"
  register: copy_config
  tags: something

- name: set config
  shell: "echo $TEMP_CONFIG"
  environment:
    TEMP_CONFIG: "{{copy_config}}"
  tags: something

But somehow after the ansible run, when I do run the following command:

但不知何故在 ansible 运行之后，当我运行以下命令时：

echo ${TEMP_CONFIG}

in my terminal it gives an empty result.

在我的终端中，它给出了一个空结果。

Any help would be appreciated.

任何帮助，将不胜感激。

回答by techraf

There are at least two problems:

至少有两个问题：

1. You should pass copy_config.stdoutas a variable

   - name: set config
     shell: "echo $TEMP_CONFIG"
     environment:
       TEMP_CONFIG: "{{copy_config.stdout}}"
     tags: something
   

2. You need to register the results of the above task and then again print the stdout, so:

   - name: set config
     shell: "echo $TEMP_CONFIG"
     environment:
       TEMP_CONFIG: "{{copy_config.stdout}}"
     tags: something
     register: shell_echo
   
   - debug:
       var: shell_echo.stdout
   

3. You never will be able to pass the variable to a non-related process this way. So unless you registered the results in an rc-file (like ~/.bash_profilewhich is sourced on interactive login if you use Bash) no other shell process would be able to see the value of TEMP_CONFIG. This is how system works.

1. 你应该copy_config.stdout作为一个变量传递

   - name: set config
     shell: "echo $TEMP_CONFIG"
     environment:
       TEMP_CONFIG: "{{copy_config.stdout}}"
     tags: something
   

2. 您需要注册上述任务的结果，然后再次打印stdout，因此：

   - name: set config
     shell: "echo $TEMP_CONFIG"
     environment:
       TEMP_CONFIG: "{{copy_config.stdout}}"
     tags: something
     register: shell_echo
   
   - debug:
       var: shell_echo.stdout
   

3. 您永远无法以这种方式将变量传递给不相关的进程。因此，除非您在 rc 文件中注册结果（~/.bash_profile如果您使用 Bash，则该文件来源于交互式登录），否则其他 shell 进程将无法看到TEMP_CONFIG. 这就是系统的工作原理。