在来自父任务的项目上使用 loop_var，避免或控制子任务中仅与父项目有关的值的循环

如何解决在来自父任务的项目上使用 loop_var，避免或控制子任务中仅与父项目有关的值的循环

团队，

我有一个运行子 IncludeTask 的父任务，因此我有一个值 item.item.0.device

现在，在子 IncludeTask 中，我必须使用此 item.item.0.device 来替换一个值，循环中的其余值将来自下面的库存值，仅用于该父项设备而不是所有设备值。然而，问题是子循环在所有设备上循环，而不仅仅是从父任务获得资格的设备。就像它在进入仅适用于 nvme 设备类型的块后也尊重 /dev/sda。

值：

local_volume_mount_disks:
  - device: /dev/sdf
    partitions:
      - number: 1
        start: 0%
        end: 25%
        storage_class:  test

  - device: /dev/nvme2n1
    partitions:
      - number: 1
        start: 0%
        end: 100%
        storage_class:  test

为 item.item.0.device 设置值的父任务

- name: "Run Tasks from file on condition device is not root"
  include_tasks:
    file: pfm_inventory_device_cp.yml
    apply:
      tags: pfm_inventory_device_cp
  loop: "{{ is_device_root.results | unique }}"
  when:
    - item.rc == 1

子任务

    - name: Create ext4 filesystem on partitions for NVME type device
      filesystem:
        fstype: ext4
        dev: "{{ loop_var_nvme.0.device }}{{ nvme_extn }}{{ loop_var_nvme.1.number }}"
      loop:  "{{ local_volume_mount_disks|subelements('partitions') }}"
      loop_control:
        loop_var: loop_var_nvme
      when: item.item.0.device is regex("nvme\w+")

现在，发生的事情是我的子任务而不是跳过 sda* 设备，而是在不匹配的正则表达式上执行，因为我在内部使用了循环。

错误输出

 TASK [local_volume_mount : Create ext4 filesystem on partitions for NVME type device] ***
 Friday 07 May 2021  16:48:48 +0000 (0:00:00.063)       0:00:11.060 ************ 
   ok: [node1] => (item=[{'device': '/dev/nvme2n1','partitions': [{'number': 1,'start': '0%','end': '100%','storage_class': 'test'}]},{'number': 1,'storage_class': 'test'}])

   failed: [node1] (item=[{'device': '/dev/sdf','end': '25%','storage_class': 'test'},{'number': 2,'start': ‘0%’,'end': ’25%’,'storage_class': 'test'}]) => {"ansible_loop_var": "loop_var_nvme","changed": false,"loop_var_nvme": [{"device": "/dev/sdf","partitions": [{"end": "25%","number": 1,"start": "0%","storage_class": "test"},{"end": "50%","number": 2,"start": "25%","storage_class": "test"}]},{"end": "25%","storage_class": "test"}],"msg": "Device /dev/sdfp1 not found."}

预期

 TASK [local_volume_mount : Create ext4 filesystem on partitions for NVME type device] ***
 Friday 07 May 2021  16:48:48 +0000 (0:00:00.063)       0:00:11.060 ************ 
   ok: [node1] => (item=[{'device': '/dev/nvme2n1','storage_class': 'test'}])

   skipping: [node1] => (item=[{'device': '/dev/sda','storage_class': 'test'}])

解决方法

问题似乎在于使用 loop_var 获取列表元素的值，但在 item 条件中使用 when。要么在任何地方使用 item，要么使用 loop_var_nvme。

这样的任务，当设备与“nvme”不匹配时跳过该项目：

- debug:
    msg: "Device = {{ loop_var_nvme.0.device }}; Device number = {{ loop_var_nvme.1.number }}"
  loop: "{{ local_volume_mount_disks|subelements('partitions') }}"
  loop_control:
    loop_var: loop_var_nvme
  when: loop_var_nvme.0.device is regex("nvme\w+")

运行时：

TASK [debug] ********************************************************************************************************************************************************************************
skipping: [localhost] => (item=[{'device': '/dev/sdf','partitions': [{'number': 1,'start': '0%','end': '25%','storage_class': 'test'}]},{'number': 1,'storage_class': 'test'}])
ok: [localhost] => (item=[{'device': '/dev/nvme2n1','end': '100%','storage_class': 'test'}]) => {
    "msg": "Device = /dev/nvme2n1; Device number = 1"
}