Question

我正在尝试删除一个与另一个文件不匹配的文件。删除文件后，我想将变量从“ 1”更改为“ 0”，以执行其他处理。但是，当我尝试使用vars进行更改并运行它时。它不会跳过旧文件并安装新文件，而是会跳过这两个文件。

代码：

# Runs if the file on the target host don't match another remote host file
   - name: Remove old tar file
      file:
         path: /tmp/{{ target_tar_name }}
         state: absent
      vars:
         target_version_matched: "0"
      # Below should be hostname with tarfile on it
      when: 
        - target_version_matched == "1"
        - tar_version != target_tar_name


 # Copies the file from the host to the target machine if nothing exist    
    - name: Copy Remote-To-Remote (host to target)
      synchronize: src=/tmp/{{ tar_version }} dest=/tmp
      delegate_to: 10.x.x.x
      when: target_version_matched == "0"

错误：

TASK [Remove old tar file] *****************************************************************************************************************************************************************************
skipping: [10.x.x.x]

TASK [Copy Remote-To-Remote (host to target)] **********************************************************************************************************************************************************
skipping: [10.x.x.x]

Answer 1

在下面使用

# Runs if the file on the target host don't match another remote host file
    - name: Remove old tar file
      file:
         path: /tmp/{{ target_tar_name }}
         state: absent
      # Below should be hostname with tarfile on it
      when: 
        - target_version_matched == "1"
        - tar_version != target_tar_name
      register: result

   - name: Check if result changes
     set_fact:
         target_version_matched: "0"
     when: result.changed

 # Copies the file from the host to the target machine if nothing exist    
    - name: Copy Remote-To-Remote (host to target)
      synchronize: src=/tmp/{{ tar_version }} dest=/tmp
      delegate_to: 10.x.x.x
      when: target_version_matched == "0"

      #when: result.changed # or you can use result directly here, if target_version_matched is not used anywhere

Answer 2

问题的说明

以下任务将始终被跳过，因为 vars 在何时

之前求值

   - name: Remove old tar file
      file:
         path: /tmp/{{ target_tar_name }}
         state: absent
      vars:
         target_version_matched: "0"
      when: 
        - target_version_matched == "1"

示例

- hosts: localhost
  vars:
    match: '999'
  tasks:

# Always skipped because 'match' is assigned '0' by 'vars' first
    - debug:
        var: match
      vars:
        match: '0'
      when: match == '1'
# TASK [debug] *********************************************
# skipping: [localhost]

# Always pass because 'match' is assigned '1' by 'vars' first
    - debug:
        var: match
      vars:
        match: '1'
      when: match == '1'
# TASK [debug] *********************************************
# ok: [localhost] => {
#     "match": "1"
# }

# Scope of variables declared inside a task is this task
    - debug:
        var: match
# TASK [debug] *********************************************
# ok: [localhost] => {
#     "match": "999"
# }

# All skipped because 'when' is applied to all tasks first
    - block:
        - debug:
            var: match
        - set_fact:
            match: '1'
        - debug:
            var: match
      when: match == '1'
# TASK [debug] *********************************************
# skipping: [localhost]
# TASK [set_fact] ******************************************
# skipping: [localhost]
# TASK [debug] *********************************************
# skipping: [localhost]

一旦在Ansible中执行了操作，如何更改变量？

2 个答案: