问题描述
我正在运行一些集成测试，在其中启动Ubuntu 20.04 VM，装入包含测试的共享文件夹并运行它们。这些测试使用pytest运行，涉及对subprocess.run（）的一些调用，主要是为了获取systemd服务的journalctl条目。因此，从本质上讲，我启动了虚拟机，并使用VBoxManage guestcontrol来配置虚拟机并运行pytests。
VirtualBox版本：6.1.10
Python版本：3.8.5
pytest版本：6.1.2
defaultdict如果我从VM内运行测试，则可以正常运行。但是，当使用VBoxManage guestcontrol运行时，出现了brokenPipeError。我在这里粘贴pytest的junit输出。
def recent_log_line(service):
"""Searches for a log line with the given URL after a date."""
after_date = datetime.datetime.Now()
after_date = after_date.strftime('%Y-%m-%d %H:%M:%s')
f = subprocess.run(["journalctl","-u",service,'--since',after_date],capture_output=True,encoding='utf-8')
log = f.stdout
return 'Succeeded' in log
我尝试使用文件而不是subprocess.PIPE，但效果相同。仅当使用<?xml version="1.0" encoding="utf-8"?><testsuites><testsuite name="pytest" errors="1" failures="0" skipped="0" tests="4" time="30.775" timestamp="2020-10-29T16:53:12.196393" hostname="Ubuntu-test"><testcase classname="test_main" name="test_registration" time="0.001" /><testcase classname="test_main" name="test_healthcheck" time="0.050" /><testcase classname="test_main" name="test_configuration" time="0.039" /><testcase time="0.000" /><testcase classname="pytest" name="internal" time="0.000"><error message="internal error">Traceback (most recent call last):
File "/root/.local/lib/python3.8/site-packages/_pytest/main.py",line 257,in wrap_session
session.exitstatus = doit(config,session) or 0
File "/root/.local/lib/python3.8/site-packages/_pytest/main.py",line 313,in _main
config.hook.pytest_runtestloop(session=session)
File "/root/.local/lib/python3.8/site-packages/pluggy/hooks.py",line 286,in __call__
return self._hookexec(self,self.get_hookimpls(),kwargs)
File "/root/.local/lib/python3.8/site-packages/pluggy/manager.py",line 93,in _hookexec
return self._inner_hookexec(hook,methods,line 84,in <lambda>
self._inner_hookexec = lambda hook,kwargs: hook.multicall(
File "/root/.local/lib/python3.8/site-packages/pluggy/callers.py",line 208,in _multicall
return outcome.get_result()
File "/root/.local/lib/python3.8/site-packages/pluggy/callers.py",line 80,in get_result
raise ex[1].with_traceback(ex[2])
File "/root/.local/lib/python3.8/site-packages/pluggy/callers.py",line 187,in _multicall
res = hook_impl.function(*args)
File "/root/.local/lib/python3.8/site-packages/_pytest/main.py",line 338,in pytest_runtestloop
item.config.hook.pytest_runtest_protocol(item=item,nextitem=nextitem)
File "/root/.local/lib/python3.8/site-packages/pluggy/hooks.py",in _multicall
res = hook_impl.function(*args)
File "/root/.local/lib/python3.8/site-packages/pytest_rerunfailures.py",line 261,in pytest_runtest_protocol
item.ihook.pytest_runtest_logreport(report=report)
File "/root/.local/lib/python3.8/site-packages/pluggy/hooks.py",in _multicall
res = hook_impl.function(*args)
File "/root/.local/lib/python3.8/site-packages/_pytest/terminal.py",line 561,in pytest_runtest_logreport
self.flush()
File "/root/.local/lib/python3.8/site-packages/_pytest/terminal.py",line 422,in flush
self._tw.flush()
File "/root/.local/lib/python3.8/site-packages/_pytest/_io/terminalwriter.py",line 174,in flush
self._file.flush()
brokenPipeError: [Errno 32] broken pipe</error></testcase></testsuite></testsuites>
运行时才会出现此问题。
解决方法
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