由于include_vars文件中的未定义变量，正在执行ansible播放

Question

下面是我的剧本：

  tasks:
   - name: Construct File Path on Destination Server.
     include_vars:
       file: "{{ item }}"
     with_fileglob:
        - "vars/myvars.yaml"

   - name: setting_facts for BackEnd
     set_fact:
       fpath_BackEnd_APP: []
     set_fact:
       fpath_BackEnd_APP: "{{ fpath_BackEnd_APP + [ BASEPATH ~ '/' ~ vars[ (item | splitext)[1].split('.')[1] ] ~ '/' ~ item | basename ] }}"
     with_items:
       - "{{ Source_Filenames.split(',') }}"

这是我的变量文件：

cat vars / myvars.yaml

com: /path/to/com/folder
src: /path/to/src/folder

下面的剧本运行符合预期。

ansible-playbook  /app/deploy.yml -e Source_Filenames=/app/testing_purpose.src,/app/testing_purpose.com

但是，当我传递不带点号（。）的文件名（即没有文件扩展名时，ansible播放无法在myvars.yaml中找到变量，并出现以下错误：

ansible-playbook  /app/deploy.yml -e Source_Filenames=/app/testing_purpose.src,/app/testing_purpose,/app/testing_purpose.com,/app/testing_moht

"The task includes an option with an undefined variable. The error was: list object has no element 1\n\nThe error appears to be in '/app/deploy.yml'"

我的要求是在传递没有扩展名的文件的情况下，为变量“ fpath_BackEnd_APP”分配“ / path / to / no-ext / folder”。

任何解决方案将不胜感激。

Answer 1

如果作为条目/toto/pipo

$ ansible localhost -m debug -a "msg={{ (item | splitext) }}" -e item=/toto/pipo
localhost | SUCCESS => {
    "msg": "('/toto/pipo', '')"
}

$ ansible localhost -m debug -a "msg={{ (item | splitext)[1] }}" -e item=/toto/pipo
localhost | SUCCESS => {
    "msg": ""
}

$ ansible localhost -m debug -a "msg={{ (item | splitext)[1].split('.') }}" -e item=/toto/pipo
localhost | SUCCESS => {
    "msg": [
        ""
    ]
}

$ ansible localhost -m debug -a "msg={{ (item | splitext)[1].split('.')[1] }}" -e item=/toto/pipo
localhost | FAILED! => {
    "msg": "The task includes an option with an undefined variable. The error was: list object has no element 1"
}

因此，如果您传递包含扩展名的条目：

$ ansible localhost -m debug -a "msg={{ (item | splitext)[1].split('.')[1] }}" -e item=/toto/pipo.test
localhost | SUCCESS => {
    "msg": "test"
}

同时，当表达式本身不返回值时，您可以设置默认值：

$ ansible localhost -m debug -a "msg={{ (item | splitext)[1].split('.')[1] | default('') }}" -e item=/toto/pipo
localhost | SUCCESS => {
    "msg": ""
}