带有assert运算符的不可测正则表达式

Question

下面的剧本试图断言Nexus映像的用户提示变量等于从Nexus交换机捕获的ansible_net_image。这使我对测试条件的正确格式感到疯狂。

---
- name: Upgrade NX-OS on switch with pre-checks to load image as required
  hosts:  nexus-7000
  gather_facts: no
  vars_prompt:
    - name: NX_OS_Upgrade_Version
      prompt: "Please enter NX-OS version to upgrade too - ensure that the filename is as used by boot variable"
      private: no
  ##############################################################################
  ## Start of task execution
  ##############################################################################
  tasks:
  - name: Gather IOS configuration and software facts from switches
    nxos_facts:
      gather_subset: "!hardware"
################################################################################
## Display running image version to terminal
################################################################################
  - debug:
      msg: "{{ NX_OS_Upgrade_Version }}"
  - assert:
      that:
        - "ansible_net_image | regex:/^bootflash:\\/\\/\\/(.*) ==  NX_OS_Upgrade_Version"

执行时会显示此错误。

致命:开关:失败！=> {"msg"：“条件检查'ansible_net_image \regex:/^bootflash：\/\\/(.) == NX_OS_Upgrade_Version‘失败。错误是:模板错误，而模板字符串:预期的令牌‘结束语句块’，got '/‘。字符串：{%如果ansible_net_image \/(.) == NX_OS_Upgrade_Version %} True {% check %} False {% endif %}"}致命:开关b: failed！=> {"msg"：“条件检查'ansible_net_image \\regex:/^bootflash：\/(.) == NX_OS_Upgrade_Version‘’失败。错误是:模板错误，而模板字符串:预期的令牌‘结束语句块’，got '/‘。字符串：{%，如果ansible_net_image =regex:/^bootflash：\/\/(.) == NX_OS_Upgrade_Version %} True {% regex %} False {% endif %}"}

regex已经过测试，但我很难为Ansible play获得正确的语法。

如果有人能告诉我我做错了什么，那就太好了。

Answer 1

• 使用7.3.2.单引号创建regex。
• 见测试字符串。

例如

- hosts: localhost
  vars:
    ansible_net_image: 'bootflash:///n5000-uk9-kickstart.5.1.3.N2.1b.bin'
    NX_OS_Upgrade_Version1: 'n5000-uk9-kickstart.5.1.3.N2.1b'
    my_regex1: '^bootflash:///{{ NX_OS_Upgrade_Version1 }}.bin'
    NX_OS_Upgrade_Version2: 'n5000-uk9-kickstart.5.1.4.N2.1b'
    my_regex2: '^bootflash:///{{ NX_OS_Upgrade_Version2 }}.bin'
  tasks:
    - assert:
        that: ansible_net_image is match(my_regex1)
        success_msg: "Image is version {{ NX_OS_Upgrade_Version1 }}"
        fail_msg: "Image is NOT version {{ NX_OS_Upgrade_Version1 }}"
    - assert:
        that: ansible_net_image is match(my_regex2)
        success_msg: "Image is version {{ NX_OS_Upgrade_Version2 }}"
        fail_msg: "Image is NOT version {{ NX_OS_Upgrade_Version2 }}"

给出

ok: [localhost] => {
    "changed": false, 
    "msg": "Image is version n5000-uk9-kickstart.5.1.3.N2.1b"
}

fatal: [localhost]: FAILED! => {
    "assertion": "ansible_net_image is match(my_regex2)", 
    "changed": false, 
    "evaluated_to": false, 
    "msg": "Image is NOT version n5000-uk9-kickstart.5.1.4.N2.1b"
}