Linux Ansible：即使在调试后显示已注册变量'；内容 双寄存器变量

我有一个任务列表，在其中注册shell任务的输出。shell命令列出一个目录，然后通过管道将输出传输到grep。这个任务很有效，我得到了我想要的结果。playbook SVN源文件中的Eariler将被选中并发送到{{DestRemoteDir}}目录。所讨论的代码从命令的输出构建一个列表。我把这些清单放在剧本后面的其他各种事实上。[]（我知道ansible的查找模块，但我发现“ls-1”更易于使用。）

剧本（任务/main.yml） 输出 调试 在“标准输出列”上方：[“IA-XD-U列表”和“标准输出列”：[“iaxd-U 1.2.7.6-15_all.deb”，…]已准备就绪

因此，从调试任务中，我看到变量存在并已定义（或者我认为是这样）。但是当我测试shell命令是否失败时

错误消息 状态清楚地表明Deb_列表未定义为什么？ 我只是调试那个变量的thad值

TASK [server_iaxd_install : Print if undefined Deb_list] *********************************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:64
Tuesday 25 February 2020  11:50:12 +0100 (0:00:00.222)       0:00:07.890 ******
ok: [AnsibleTest2] => {
    "msg": "Deb_List is not real"
}
Read vars_file '/home/ansible/.ssh/SudoPassKey'

尝试测试我想要的关键数据“Deb_list.stdout_line”，可能会出现错误，因为变量不存在

TASK [server_iaxd_install : Print if undefined Deb_list.stdout_lines] ********************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:69
Tuesday 25 February 2020  11:50:12 +0100 (0:00:00.197)       0:00:08.087 ******
fatal: [AnsibleTest2]: FAILED! => {
    "msg": "The conditional check 'Deb_list.stdout_lines is undefined' failed. The error was: error while evaluating conditional (Deb_list.stdout_lines is undefined): 'Deb_list' is undefined\n\nThe error appears to have been in '/home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml': line 69, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Print if undefined Deb_list.stdout_lines\n  ^ here\n"
}

这要么是一个“树之林”（我看不出明显的）错误，要么是一个我需要绕过去的恼人的Ansible怪癖。

是的，这是一个“树之林”（我看不到明显的）错误。 查找错误后，我更改了代码

- name: Print if undefined Deb_List
  debug:
    msg: "Deb_List is not real"
  when: Deb_List is undefined

- name: Print if undefined Deb_List.stdout_lines
  debug:
    msg: "Deb_List.stdout_lines is not real"
  when: Deb_List.stdout_lines is undefined

而现在的输出要好得多：

TASK [server_iaxd_install : Print if undefined Deb_List] *********************************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:77
Tuesday 25 February 2020  16:00:34 +0100 (0:00:00.242)       0:00:08.013 ******
skipping: [AnsibleTest2] => {}
Read vars_file '/home/ansible/.ssh/SudoPassKey'

TASK [server_iaxd_install : Print if undefined Deb_List.stdout_lines] ********************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:82
Tuesday 25 February 2020  16:00:34 +0100 (0:00:00.065)       0:00:08.078 ******
skipping: [AnsibleTest2] => {}

---

大写：

当：Deb_列表未定义时

应该是

当：Deb_列表未定义时

。是的，就是这样。

TASK [server_iaxd_install : Print if undefined Deb_list.stdout_lines] ********************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:69
Tuesday 25 February 2020  11:50:12 +0100 (0:00:00.197)       0:00:08.087 ******
fatal: [AnsibleTest2]: FAILED! => {
    "msg": "The conditional check 'Deb_list.stdout_lines is undefined' failed. The error was: error while evaluating conditional (Deb_list.stdout_lines is undefined): 'Deb_list' is undefined\n\nThe error appears to have been in '/home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml': line 69, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Print if undefined Deb_list.stdout_lines\n  ^ here\n"
}

- name: Print if undefined Deb_List
  debug:
    msg: "Deb_List is not real"
  when: Deb_List is undefined

- name: Print if undefined Deb_List.stdout_lines
  debug:
    msg: "Deb_List.stdout_lines is not real"
  when: Deb_List.stdout_lines is undefined

TASK [server_iaxd_install : Print if undefined Deb_List] *********************************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:77
Tuesday 25 February 2020  16:00:34 +0100 (0:00:00.242)       0:00:08.013 ******
skipping: [AnsibleTest2] => {}
Read vars_file '/home/ansible/.ssh/SudoPassKey'

TASK [server_iaxd_install : Print if undefined Deb_List.stdout_lines] ********************************************************
task path: /home/ansible/ansible_server_working/roles/server_iaxd_install/tasks/main.yml:82
Tuesday 25 February 2020  16:00:34 +0100 (0:00:00.065)       0:00:08.078 ******
skipping: [AnsibleTest2] => {}