bind() on AF_UNIX socket may fail in tests run as non-root

[xdegaye]

BPO	36341
Nosy	@xdegaye, @miss-islington
PRs	bpo-36341: Fix tests calling bind() on AF_UNIX sockets #12399

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-05-03.15:09:35.655>
created_at = <Date 2019-03-18.09:28:31.739>
labels = ['3.8', 'type-bug', 'tests']
title = 'bind() on AF_UNIX socket may fail in tests run as non-root'
updated_at = <Date 2019-05-03.15:09:35.654>
user = 'https://github.com/xdegaye'

bugs.python.org fields:

activity = <Date 2019-05-03.15:09:35.654>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-03.15:09:35.655>
closer = 'asvetlov'
components = ['Tests']
creation = <Date 2019-03-18.09:28:31.739>
creator = 'xdegaye'
dependencies = []
files = []
hgrepos = []
issue_num = 36341
keywords = ['patch']
message_count = 2.0
messages = ['338183', '341342']
nosy_count = 2.0
nosy_names = ['xdegaye', 'miss-islington']
pr_nums = ['12399']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36341'
versions = ['Python 3.8']

[xdegaye]

This happens on Android where a SELinux policy prevents a plain user to bind() a pathname AF_UNIX socket (abstract and unnamed sockets are not constrained by this policy).

The errors are:

test_asyncio:
======================================================================
ERROR: test_start_unix_server_1 (test.test_asyncio.test_server.SelectorStartServerTests)
----------------------------------------------------------------------

Traceback (most recent call last):
File "/data/local/tmp/python/lib/python3.8/test/test_asyncio/test_server.py", line 105, in test_start_unix_server_1
  srv = self.loop.run_until_complete(asyncio.start_unix_server(
File "/data/local/tmp/python/lib/python3.8/asyncio/base_events.py", line 589, in run_until_complete
  return future.result()
File "/data/local/tmp/python/lib/python3.8/asyncio/streams.py", line 115, in start_unix_server
  return await loop.create_unix_server(factory, path, **kwds)
File "/data/local/tmp/python/lib/python3.8/asyncio/unix_events.py", line 285, in create_unix_server
  sock.bind(path)
PermissionError: [Errno 13] Permission denied

test_socket:
======================================================================
ERROR: test_socket_fileno (test.test_socket.GeneralModuleTests)
----------------------------------------------------------------------

Traceback (most recent call last):
File "/data/local/tmp/python/lib/python3.8/test/test_socket.py", line 1780, in test_socket_fileno
  s.bind(os.path.join(tmpdir, 'socket'))
PermissionError: [Errno 13] Permission denied

test_stat:
======================================================================
ERROR: test_socket (test.test_stat.TestFilemodeCStat)
----------------------------------------------------------------------

Traceback (most recent call last):
File "/data/local/tmp/python/lib/python3.8/test/test_stat.py", line 198, in test_socket
  s.bind(TESTFN)
PermissionError: [Errno 13] Permission denied

======================================================================
ERROR: test_socket (test.test_stat.TestFilemodePyStat)
----------------------------------------------------------------------

Traceback (most recent call last):
File "/data/local/tmp/python/lib/python3.8/test/test_stat.py", line 198, in test_socket
  s.bind(TESTFN)
PermissionError: [Errno 13] Permission denied

[miss-islington]

New changeset 4461d70 by Miss Islington (bot) (xdegaye) in branch 'master':
bpo-36341: Fix tests calling bind() on AF_UNIX sockets (GH-12399)
4461d70