如何使用 Ansible 在远程文件中搜索字符串？

基于一个问题

• 如何使用 Ansible 在文件中搜索字符串？ https://superuser.com/a/1764857/754490
• Ansible：如何从文件内容中提取特定字符串？ https://stackoverflow.com/a/75099369/6771046
• Can slurp用作直接替代lookup? https://stackoverflow.com/a/73711588/6771046

以及诸如此类的考虑

• 通过使用slurp模块一将通过网络将整个文件从远程节点传输到控制节点，以便处理它并查找字符串。对于日志文件，这些文件可以是几 MB，并且如果远程节点上的文件包含特定字符串，那么人们主要只对信息感兴趣，因此人们只需要传输这种信息，true or false.
• 如何使用 Ansible 在远程节点上执行脚本？ https://stackoverflow.com/a/73363872/6771046

我想知道如何解决这个问题而不是使用shell module?

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    SEARCH_STRING: "test"
    SEARCH_FILE: "test.file"

  tasks:

  - name: Search for string in file
    command:
      cmd: "grep '{{ SEARCH_STRING }}' {{ SEARCH_FILE }}"
    register: result
    # Since it is a reporting task
    # which needs to deliver a result in any case
    failed_when: result.rc != 0 and result.rc != 1
    check_mode: false
    changed_when: false

或者不使用解决方法lineinfile module?

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    SEARCH_STRING: "test"
    SEARCH_FILE: "test.file"

  tasks:

  - name: Search for string
    lineinfile:
      path: "{{ SEARCH_FILE }}"
      regexp: "{{ SEARCH_STRING }}"
      line: "SEARCH_STRING FOUND"
      state: present
    register: result
    # Since it is a reporting task
    changed_when: false
    failed_when: "'replaced' not in result.msg" # as it means SEARCH_STRING NOT FOUND
    check_mode: true # to prevent changes and to do a dry-run only

  - name: Show result, if not found
    debug:
      var: result
    when: "'added' in result.msg" # as it means SEARCH_STRING NOT FOUND

由于我正在寻找一种更通用的方法，这是否是一个可行的案例您应该开发一个模块吗？ https://docs.ansible.com/ansible/latest/dev_guide/developing_modules.html

下列的开发模块 https://docs.ansible.com/ansible/latest/dev_guide/developing_modules_general.html and 创建模块 https://docs.ansible.com/ansible/latest/dev_guide/developing_modules_general.html#creating-a-module我找到了以下简单的解决方案

定制模块library/pygrep.py

#!/usr/bin/python

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from ansible.module_utils.basic import AnsibleModule

def run_module():
    module_args = dict(
        path=dict(type='str', required=True),
        search_string=dict(type='str', required=True)
    )

    result = dict(
        changed=False,
        found_lines='',
        found=False
    )

    module = AnsibleModule(
        argument_spec=module_args,
        supports_check_mode=True
    )

    with open(module.params['path'], 'r') as f:
        for line in f.readlines():
            if module.params['search_string'] in line:
                result['found_lines'] =  result['found_lines'] + line
                result['found'] = True

    result['changed'] = False

    module.exit_json(**result)

def main():
    run_module()

if __name__ == '__main__':
    main()

剧本pygrep.yml

---
- hosts: localhost
  become: false
  gather_facts: false

  vars:

    SEARCH_FILE: "test.file"
    SEARCH_STRING: "test"

  tasks:

  - name: Grep string from file
    pygrep:
      path: "{{ SEARCH_FILE }}"
      search_string: "{{ SEARCH_STRING }}"
    register: search

  - name: Show search
    debug:
      var: search
    when: search.found

对于一个简单的test.file

NOTEST
This is a test file.
It contains several test lines.
321tset
123test
cbatset
abctest
testabc
test123
END OF TEST

它将导致输出

TASK [Show search] ******************
ok: [localhost] =>
  search:
    changed: false
    failed: false
    found: true
    found_lines: |-
      This is a test file.
      It contains several test lines.
      123test
      abctest
      testabc
      test123

一些链接

• 是什么grepPython 中的等效项？ https://stackoverflow.com/a/47977225/6771046
• cat, grep and cut- 翻译成Python https://stackoverflow.com/a/26659479/6771046
• 相当于Linux命令的Python代码是什么grep -A? https://stackoverflow.com/a/50096658/6771046