pathlib.[r]glob fails when the toplevel directory is not readable, whereas glob.glob "succeeds"

[anntzer]

BPO	34807
Nosy	@anntzer, @tirkarthi

^{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 2018-09-26.08:36:33.686>
labels = ['3.7', 'library']
title = 'pathlib.[r]glob fails when the toplevel directory is not readable, whereas glob.glob "succeeds"'
updated_at = <Date 2018-09-26.12:43:56.029>
user = 'https://github.com/anntzer'

bugs.python.org fields:

activity = <Date 2018-09-26.12:43:56.029>
actor = 'xtreak'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-09-26.08:36:33.686>
creator = 'Antony.Lee'
dependencies = []
files = []
hgrepos = []
issue_num = 34807
keywords = []
message_count = 1.0
messages = ['326432']
nosy_count = 2.0
nosy_names = ['Antony.Lee', 'xtreak']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue34807'
versions = ['Python 3.7']

Linked PRs

• GH-78988: Document pathlib.Path.glob() exception propagation. #114036
• [3.12] GH-78988: Document pathlib.Path.glob() exception propagation. (GH-114036) #114154

[anntzer]

After

 $ mkdir -p foo/bar && chmod 000 foo

one gets

In [1]: glob.glob("foo/bar")
Out[1]: []

but

In [2]: list(Path("foo/bar").glob("*"))

gives a PermissionError.

I'm not arguing that pathlib should reproduce glob's behavior (in fact I think raising an exception is better in this case), but this could be better documented (os.walk does indicate that "By default, errors from the scandir() call are ignored." whereas I don't think either glob or pathlib docs mention this point at all).

Compare with https://bugs.python.org/issue24120, which relates to unreadable directories found *inside* the toplevel directory.