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Accepted
alexus
Asked: 2023-05-08 10:13:22 +0800 CST

您应该将任务的 `loop_control` 选项中的 `loop_var` 值设置为其他值以避免变量

  • 772

我的环境：

# cat /etc/debian_version
11.7
# ansible-playbook --version
ansible-playbook [core 2.13.1]
  config file = None
  configured module search path = ['/root/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.9/dist-packages/ansible
  ansible collection location = /root/.ansible/collections:/usr/share/ansible/collections
  executable location = /usr/local/bin/ansible-playbook
  python version = 3.9.2 (default, Feb 28 2021, 17:03:44) [GCC 10.2.1 20210110]
  jinja version = 3.1.2
  libyaml = True
#

以下任务是我的 Ansible 角色的一部分：

- name: _file - state:absent
  ansible.builtin.file:
    path: "{{ item.path }}"
    state: absent
  loop: "{{ find.files | flatten }}"
  register: file
  when: find.matched is defined and find.matched != 0

然而，我注意到一条警告信息：

[警告]：任务：XYZ：_file - 状态：不存在：循环变量“item”已在使用中。您应该将任务选项loop_var中的值设置为其他值，以避免变量冲突和意外行为。loop_control

阅读一些之后：

我将任务修改为如下内容：

- name: _file - state:absent
  ansible.builtin.file:
    path: "{{ item.path }}"
    state: absent
  loop: "{{ find.files | flatten }}"
  loop_control:
    label: "{{ item.path }}"
    loop_var: find
  register: file
  when: find.matched is defined and find.matched != 0

这个任务在我的角色中被调用了两次，第一次工作正常，第二次失败

TASK [XYZ : _file - state:absent] ******************************************************************************************************************************************************************************
[WARNING]: TASK: XYZ : _file - state:absent: The loop variable 'find' is already in use. You should set the `loop_var` value in the `loop_control` option for the task to something else to avoid variable
collisions and unexpected behavior.
failed: [127.0.0.1] (item=None) => {"ansible_loop_var": "find", "changed": false, "find": {"atime": 1683511713.8529496, "checksum": "ecd34202c34bf761e4c2c9800a39e18dffad5d9e", "ctime": 1683511714.972948, "dev": 2049, "gid": 0, "gr_name": "root", "inode": 150677, "isblk": false, "ischr": false, "isdir": false, "isfifo": false, "isgid": false, "islnk": false, "isreg": true, "issock": false, "isuid": false, "mode": "0644", "mtime": 1683511714.972948, "nlink": 1, "path": "tmp/FILE.CSV", "pw_name": "root", "rgrp": true, "roth": true, "rusr": true, "size": 642, "uid": 0, "wgrp": false, "woth": false, "wusr": true, "xgrp": false, "xoth": false, "xusr": false}, "msg": "Failed to template loop_control.label: 'item' is undefined", "skip_reason": "Conditional result was False"}

请指教。

ansible

1 个回答

  1. Best Answer

    目前还不清楚为什么您需要注册变量item 的（未记录的）外循环。例如，给定树

    shell> tree /tmp/test
/tmp/test
├── file1
├── file2
└── file3

    下面的戏

    shell> cat pb.yml
- hosts: localhost

  tasks:

    - find:
        paths: /tmp/test
      register: find

    - file:
        path: "{{ item.path }}"
        state: absent
      loop: "{{ find.files }}"
      loop_control:
        label: "{{ item.path }}"

    在--check --diff模式下运行

    shell> ansible-playbook -CD pb.yml

PLAY [localhost] ******************************************************************************

TASK [find] ***********************************************************************************
ok: [localhost]

TASK [file] ***********************************************************************************
--- before
+++ after
@@ -1,2 +1,2 @@
 path: /tmp/test/file3
-state: file
+state: absent

changed: [localhost] => (item=/tmp/test/file3)
--- before
+++ after
@@ -1,2 +1,2 @@
 path: /tmp/test/file2
-state: file
+state: absent

changed: [localhost] => (item=/tmp/test/file2)
--- before
+++ after
@@ -1,2 +1,2 @@
 path: /tmp/test/file1
-state: file
+state: absent

changed: [localhost] => (item=/tmp/test/file1)

PLAY RECAP ************************************************************************************
localhost: ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

    笔记：

    • 如果你定义loop_var使用它。下面的任务给出了相同的结果
    - file:
    path: "{{ my_loop_var.path }}"
    state: absent
  loop: "{{ find.files }}"
  loop_control:
    label: "{{ my_loop_var.path }}"
    loop_var: my_loop_var
    • 下面的条件是多余的。去掉它。当找不到任何东西时 ( find.matched: 0 ) 文件列表为空 ( fined.files: [] ) 并且无论如何都会跳过循环
      when: find.matched is defined and find.matched != 0
    • 如果find是模块find的注册变量，则没有什么可以展平的。过滤器压平可以移除
      loop: "{{ find.files }}"
    • 0

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