python - 在 testinfra 中使用 Ansible 变量

Question

使用带有 Ansible 后端的 TestInfra 进行测试。除了在运行测试时使用 Ansible 本身之外一切正常

测试.py

import pytest
def test_zabbix_agent_package(host):
    package = host.package("zabbix-agent")
    assert package.is_installed
    package_version = host.ansible("debug", "msg={{ zabbix_agent_version }}")["msg"]
    (...)

其中 zabbix_agent_version 是来自 group_vars 的 Ansible 变量。可以通过运行这个playbook得到

- hosts: all
  become: true
  tasks:
  - name: debug
    debug: msg={{ zabbix_agent_version }}

命令执行测试

pytest --connection=ansible --ansible-inventory=inventory  --hosts=$hosts -v test.py

ansible.cfg

[defaults]
timeout = 10
host_key_checking = False
library=library/
retry_files_enabled = False
roles_path=roles/
pipelining=true
ConnectTimeout=60
remote_user=deploy
private_key_file=/opt/jenkins/.ssh/deploy

我得到的输出是

self = <ansible>, module_name = 'debug', module_args = 'msg={{ zabbix_agent_version }}', check = True, kwargs = {}
result = {'failed': True, 'msg': "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'zabbix_agent_version' is undefined"}

    def __call__(self, module_name, module_args=None, check=True, **kwargs):
        if not self._host.backend.HAS_RUN_ANSIBLE:
            raise RuntimeError((
                "Ansible module is only available with ansible "
                "connection backend"))
        result = self._host.backend.run_ansible(
            module_name, module_args, check=check, **kwargs)
        if result.get("failed", False) is True:
>           raise AnsibleException(result)
E           AnsibleException: Unexpected error: {'failed': True,
E            'msg': u"the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'zabbix_agent_version' is undefined"}

/usr/lib/python2.7/site-packages/testinfra/modules/ansible.py:70: AnsibleException

知道为什么 Ansible 在运行 testinfra 的 Ansible 模块时看不到这个变量，而在单独运行 Ansible 时却可以看到它吗？

Answer 1

如果 zabbix_agent_version 是使用 group_vars 设置的变量，那么您似乎应该使用 host.ansible.get_variables() 访问它> 而不是运行 debug 任务。无论如何，两者都应该有效。如果有，在我的当前目录中:

test_myvar.py
group_vars/
  all.yml

在 group_vars/all.yml 我有:

myvar: value

在 test_myvar.py 中我有:

def test_myvar_using_get_variables(host):
    all_variables = host.ansible.get_variables()
    assert 'myvar' in all_variables
    assert all_variables['myvar'] == 'myvalue'


def test_myvar_using_debug_var(host):
    result = host.ansible("debug", "var=myvar")
    assert 'myvar' in result
    assert result['myvar'] == 'myvalue'


def test_myvar_using_debug_msg(host):
    result = host.ansible("debug", "msg={{ myvar }}")
    assert 'msg' in result
    assert result['msg'] == 'myvalue'

然后所有测试通过:

$ py.test --connection=ansible --ansible-inventory=hosts -v 
test_myvar.py 
============================= test session starts ==============================
platform linux2 -- Python 2.7.13, pytest-3.2.3, py-1.4.34, pluggy-0.4.0 -- /home/lars/env/common/bin/python2
cachedir: .cache
rootdir: /home/lars/tmp/testinfra, inifile:
plugins: testinfra-1.8.1.dev2
collected 3 items                                                               

test_myvar.py::test_myvar_using_get_variables[ansible://localhost] PASSED
test_myvar.py::test_myvar_using_debug_var[ansible://localhost] PASSED
test_myvar.py::test_myvar_using_debug_msg[ansible://localhost] PASSED

=========================== 3 passed in 1.77 seconds ===========================

您能否确认我们文件的布局(特别是您的 group_vars 目录相对于您的测试的位置)与我在此处显示的布局相匹配？