在ansible playbook中，如果塊任務中已經存在文件，如何跳過任務？

我有這樣的任務：

- name: install jetbrains toolbox
changed_when:
block:
 - name: download toolbox
   get_url:
     url: 'https://download.jetbrains.com/toolbox/jetbrains-toolbox-{{ toolbox_version }}.tar.gz'
     dest: /tmp/toolbox.tar.gz
 - name: open toolbox
   unarchive:
     src: /tmp/toolbox.tar.gz
     dest: /opt/jetbrains-toolbox
args:
 creates: /opt/jetbrains-toolbox

但它會產生一個錯誤：ERROR! 'changed_when' is not a valid attribute for a Block

/opt/jetbrains-toolbox.tar.gz如果/opt/jetbrains-toolbox已經存在，我如何跳過跳過下載的下載下載？

---
- name: register status of /tmp/toolbox.tar.gz
 stat:
   path: /tmp/toolbox.tar.gz
 register: toolbox_path

- name: install jetbrains toolbox
 # check if toolbox_path is a regular file
 when: "not toolbox_path.stat.exists"
 block:
   - name: download toolbox
     get_url:
       url: "https://download.jetbrains.com/toolbox/jetbrains-toolbox-{{ toolbox_version }}.tar.gz"
       dest: /tmp/toolbox.tar.gz

   - name: open toolbox
     unarchive:
       src: /tmp/toolbox.tar.gz
       dest: /opt/jetbrains-toolbox

您可能還想在下載中包含校驗和，因為您知道要下載的確切版本。

引用自：https://serverfault.com/questions/1065752