TemporaryDirectory objects should LOCK_SH to avoid being deleted by systemd-tmpfiles

[refi64]

BPO	37650
Nosy	@refi64
PRs	bpo-37650: tempfile: flock(LOCK_SH) on temporary directories #14908

^{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 = None
created_at = <Date 2019-07-22.12:10:54.060>
labels = ['type-feature', 'library']
title = 'TemporaryDirectory objects should LOCK_SH to avoid being deleted by systemd-tmpfiles'
updated_at = <Date 2019-07-22.12:28:47.155>
user = 'https://github.com/refi64'

bugs.python.org fields:

activity = <Date 2019-07-22.12:28:47.155>
actor = 'python-dev'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-07-22.12:10:54.060>
creator = 'refi64'
dependencies = []
files = []
hgrepos = []
issue_num = 37650
keywords = ['patch']
message_count = 1.0
messages = ['348295']
nosy_count = 1.0
nosy_names = ['refi64']
pr_nums = ['14908']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37650'
versions = []

[refi64]

If e.g. a tar archive is extracted that has dates from several months ago, if systemd-tmpfiles runs to clean up data, then it may delete that data while the directory is still being used. This can be avoided by holding a LOCK_SH on the directory while it's being used.