仅声明其他路径

vars:
    extra_path: /usr/pgsql-10/bin

下面的任务基于Response to updating PATH with ansible - system wide的想法

• 如果文件在控制器上，则测试本地文件

- name: 'Add {{ extra_path }} if PATH does not exist'
      lineinfile:
        path: /etc/environment
        line: 'PATH="{{ extra_path }}"'
        insertafter: EOF
      when: lookup('file', '/etc/environment') is not search('^\s*PATH\s*=')

    - name: 'Add {{ extra_path }} to PATH'
      lineinfile:
        path: /etc/environment
        regexp: 'PATH=(["])((?!.*?{{ extra_path }}).*?)(["])$'
        line: 'PATH=\1\2:{{ extra_path }}\3'
        backrefs: yes

• 如果文件在远程主机上，请先获取它们。要使播放等幂，请不要报告获取时的更改。根据您的需要调整目标

- name: 'Fetch /etc/environment to {{ playbook_dir }}/environments'
      fetch:
        src: /etc/environment
        dest: "{{ playbook_dir }}/environments"
      changed_when: false

    - name: 'Add {{ extra_path }} if PATH does not exist'
      lineinfile:
        path: /etc/environment
        line: 'PATH="{{ extra_path }}"'
        insertafter: EOF
      when: lookup('file', path) is not search('^\s*PATH\s*=')
      vars:
        path: "{{ path_items|path_join }}"
        path_items:
          - "{{ playbook_dir }}"
          - environments
          - "{{ inventory_hostname }}"
          - etc/environment

    - name: 'Add {{ extra_path }} to PATH'
      lineinfile:
        path: /etc/environment
        regexp: 'PATH=(["])((?!.*?{{ extra_path }}).*?)(["])$'
        line: 'PATH=\1\2:{{ extra_path }}\3'
        backrefs: yes

请参阅Python正则表达式。