can't run the tox tests twice without deleting _trial_temp

[twisted-trac]

	@graingert reported
Trac ID	trac#10036
Type	enhancement
Created	2020-10-24 13:31:14Z

when running the tests twice in a row I get this error

WARNING: Ignoring special file error '`/home/graingert/projects/twisted/_trial_temp/twisted.test.test_unix/DatagramUnixSocketTests/test_reprWithNewStyleProtocol/lk6x7h_1/temp` is a socket' encountered copying /home/graingert/projects/twisted/_trial_temp/twisted.test.test_unix/DatagramUnixSocketTests/test_reprWithNewStyleProtocol/lk6x7h_1/temp to /tmp/pip-req-build-1wyjs487/_trial_temp/twisted.test.test_unix/DatagramUnixSocketTests/test_reprWithNewStyleProtocol/lk6x7h_1/temp.
...
shutil.Error: [('/home/graingert/projects/twisted/_trial_temp/twisted.test.test_process/UtilTests/test_whichWithoutPATH/z5hnzywn/temp/baz/bar/executable', '/tmp/pip-req-build-bdskj_1a/_trial_temp/twisted.test.test_process/UtilTests/test_whichWithoutPATH/z5hnzywn/temp/baz/bar/executable', "[Errno 13] Permission denied: '/home/graingert/projects/twisted/_trial_temp/twisted.test.test_process/UtilTests/test_whichWithoutPATH/z5hnzywn/temp/baz/bar/executable'"), ('/home/graingert/projects/twisted/_trial_temp/twisted.test.test_process/UtilTests/test_which/wqtzvpna/temp/baz/bar/executable', '/tmp/pip-req-build-bdskj_1a/_trial_temp/twisted.test.test_process/UtilTests/test_which/wqtzvpna/temp/baz/bar/executable', "[Errno 13] Permission denied: '/home/graingert/projects/twisted/_trial_temp/twisted.test.test_process/UtilTests/test_which/wqtzvpna/temp/baz/bar/executable'"), ('/home/graingert/projects/twisted/_trial_temp/twisted.test.test_process/UtilTests/test_whichPathExt/4q2uzyt2/temp/baz/bar/executable', '/tmp/pip-req-build-bdskj_1a/_trial_temp/twisted.test.test_process/UtilTests/test_whichPathExt/4q2uzyt2/temp/baz/bar/executable', "[Errno 13] Permission denied: '/home/graingert/projects/twisted/_trial_temp/twisted.test.test_process/UtilTests/test_whichPathExt/4q2uzyt2/temp/baz/bar/executable'")]

this is because sockets and chmod u-x files in this directory are not cleaned up and cannot be copied by pip when building wheels

there's various other problems with _trail_temp not being cleaned up and I talk about it more here https://freenode.logbot.info/twisted-dev/20201024#c5576741-c5577518

Just moving it to {toxenvtmp} fixes a load of stuff for us and is an easy fix, but we should probably think about how to handle this sort of cleanup for other consumers of twisted.trial.

I'd like a new flag eg --basetmp-keep=3 that would opt into the pytest style tmp behaviour https://github.com/pytest-dev/pytest/blob/f81c6c00a9279ab17b29fe87d6215ace11cd7f43/src/_pytest/pathlib.py#L334

#1467

Searchable metadata

trac-id__10036 10036
type__enhancement enhancement
reporter__graingert graingert
priority__normal normal
milestone__None None
branch__ 
branch_author__ 
status__closed closed
resolution__fixed fixed
component__core core
keywords__None None
time__1603546274083361 1603546274083361
changetime__1603749140280535 1603749140280535
version__None None
owner__graingert graingert

[twisted-trac]

	@wsanchez set owner to @graingert

[twisted-trac]

	@wsanchez set status to closed