Ansible:即使在调试后显示其内容时，已注册变量仍未定义

Question

Ansuble寄存器变量

我有一个任务列表，其中我注册了一个shell任务的输出。shell命令列出一个目录，然后将输出传送到grep。任务成功了，我得到了我想要的输出。播放簿SVN源文件中的耳机将被选中，并传输到{ DestRemoteDir }}目录。所述代码从命令的输出生成一个列表。我把这些清单用来在后面的剧本中列出其他各种事实。[ Mapping a list of Debian packages in a specific order of 2nd list with Ansible ](我知道ansible的find模块，但我发现"ls -1“更容易使用)。

剧本(任务/main.yml)

## use List -1 to find the file names for the deb files.| grep
## It stays, The tasks work as expected.
- name: Find the needed deb files
  shell: "ls -1 {{ DestRemoteDir }} | grep .*.deb"  # Local dir
  register: Deb_List
  ignore_errors: yes
  delegate_to: 127.0.0.1 #localhosts

- name: Find the needed IXAD list file
  shell: "ls -1 {{ DestRemoteDir }} | grep IA-XD"  # Local dir
  register: IXAD_List_Source
  ignore_errors: yes
  delegate_to: 127.0.0.1 #localhosts

- name: Print the Deblist for IX-AD
  debug:
    msg:
      - "Deb file list: {{ Deb_List.stdout_lines }}"
      - "IXAD file {{ IXAD_List_Source.stdout_lines }}"

- 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

输出

changed: [AnsibleTest2 -> 127.0.0.1] => {
    "changed": true,
    "cmd": "ls -1 /home/ansible/IA-XD | grep .*.deb",
    ***
    "invocation": {
        "module_args": {
        ***
    },
    "rc": 0,
    "stderr": "",
    "stderr_lines": [],
    "stdout": "iaxd_1.2.7.6-15_all.deb\niaxdautocfg_1.0.0.0_all.deb\nlibjpegdeb7u1_amd64.deb\nopenjdk-6-jre_610-1~deb7u1_amd64.deb\nopenjdk-6-jre-headless_610-1~deb7u1_amd64.deb\nopenjdk-610-1~deb7u1_all.deb",
    "stdout_lines": [
        "iaxd_1.2.7.6-15_all.deb",
        "iaxdautocfg_1.0.0.0_all.deb",
        "libjpeg7u1_amd64.deb",
        "openjdk-6-jre_610-1~deb7u1_amd64.deb",
        "openjdk-6-jre-headless_610-1~deb7u1_amd64.deb",
        "openjdk-6-jre-lib_610-1~deb7u1_all.deb"
    ]
}

changed: [AnsibleTest2 -> 127.0.0.1] => {
    "changed": true,
    "cmd": "ls -1 /home/ansible/IA-XD | grep IA-XD",
    "invocation": {
        "module_args": {
            "_raw_params": "ls -1 /home/ansible/IA-XD | grep IA-XD",
        ***
        }
    },
    "rc": 0,
    "stderr": "",
    "stderr_lines": [],
    "stdout": "IA-XD_List",
    "stdout_lines": [
        "IA-XD_List"
    ]
}

调试

ok: [AnsibleTest2] => {
    "msg": [
        "Deb file list: [u'iaxd_1.2.7.6-15_all.deb',u'iaxdautocfg_1.0.0.0_all.deb',u'libjpegdeb7u1_amd64.deb',u'openjdk-6-jre_610-1~deb7u1_amd64.deb',u'openjdk-6-jre-headless_610-1~deb7u1_amd64.deb',u'openjdk-610-1~deb7u1_all.deb']",
        "IXAD file [u'IA-XD_List']"
    ]
}

以上"stdout_lines"：“iaxd_List”和"stdout_lines"："iaxd_1.2.7.6-15_all.deb"，.准备好了。

因此，从调试任务中，我看到了变量的存在，并定义了这些变量(至少我是这么认为的)。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_List是未定义的。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'

试着测试我想要的关键数据"Deb_list.stdout_lines"，因为变量不存在，所以不存在错误。

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“树木森林”(我看不出明显的)错误，要么是一个恼人的怪癖，我需要在周围。

Answer 1

是的，这是“森林换树”(我看不出明显的)错误。查找错误后，我更改代码。

- 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

现在的产出要好得多：

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] => {}