shutil.copyfile does not raise SpecialFileError for socket files

@cjerdonek

BPO	37700
Nosy	@cjerdonek, @chrahunt, @potomak
PRs	gh-81881: Raise a shutil.SpecialFileError when copying a Unix socket #16575

^{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 2019-07-29.04:22:16.840>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'shutil.copyfile does not raise SpecialFileError for socket files'
updated_at = <Date 2021-12-11.18:41:20.112>
user = 'https://github.com/chrahunt'

bugs.python.org fields:

activity = <Date 2021-12-11.18:41:20.112>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-07-29.04:22:16.840>
creator = 'chrahunt'
dependencies = []
files = []
hgrepos = []
issue_num = 37700
keywords = ['patch']
message_count = 3.0
messages = ['348595', '348596', '348602']
nosy_count = 3.0
nosy_names = ['chris.jerdonek', 'chrahunt', 'potomak']
pr_nums = ['16575']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37700'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

Linked PRs

GH-81881: Raise SpecialFileError for sockets and devices in shutil.copyfile #142693

Currently shutil.copyfile only raises SpecialFileError for named pipes. When trying to use the function to copy a socket file, the exception raised depends on the platform, for example:

macOS: "[Errno 102] Operation not supported on socket: '/Users/guido/src/mypy/dmypy.sock'"
HP-UX: "[Errno 223] Operation not supported: 'example/foo'"
Solaris: "[Errno 122] Operation not supported on transport endpoint: 'example/foo'"
AIX: "[Errno 64] Operation not supported on socket: '../../example/foo'"
Linux: "[Errno 6] No such device or address: 'example/foo'"

This can be reproduced like:

    import os
    import shutil
    import socket
    import tempfile

    d = tempfile.mkdtemp()
    src = os.path.join(d, "src")
    dest = os.path.join(d, "dest")
    sock = socket.socket(socket.AF_UNIX)
    sock.bind(src)

    shutil.copyfile(src, dest)

Making shutil.copyfile raise SpecialFileError for socket files would improve the interface of this function since the same class of error could be ignored. This is mostly useful with shutil.copytree, which defaults to copyfile for its copy function.

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shutil.copyfile does not raise SpecialFileError for socket files #81881

Linked PRs

XXX What about other special files? (sockets, devices...)

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shutil.copyfile does not raise SpecialFileError for socket files #81881

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chrahunt commented on Jul 29, 2019

chrahunt commented on Jul 29, 2019

XXX What about other special files? (sockets, devices...)

cjerdonek commented on Jul 29, 2019

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