test: repository path

[SebastianSpeitel]

Description

I found a bug, where a repository with a path containing @ can't be used.
This adds a test which reproduces the issue.

Checklist

• PR is against master (or maintenance branch if only applicable there)
• New code has tests and docs where appropriate
• Tests pass (run tox or the relevant test subset)
• Commit messages are clean and reference related issues

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
1676	1	1675	345

View the top 1 failed test(s) by shortest run time

src.borg.testsuite.repository_test::test_repository_path

Stack Traces | 0.005s run time

tmp_path = PosixPath('.../pytest-0/popen-gw3/test_repository_path0')

    def test_repository_path(tmp_path):
        location = os.fspath(tmp_path / "@repo")
        repository = Repository(location)
>       assert repository.url.endswith("@repo")
E       AssertionError: assert False
E        +  where False = <built-in method endswith of str object at 0x7f968b2757b0>('@repo')
E        +    where <built-in method endswith of str object at 0x7f968b2757b0> = 'file://.../pytest-0/popen-gw3/test_repository_path0/%40repo'.endswith
E        +      where 'file://.../pytest-0/popen-gw3/test_repository_path0/%40repo' = <Repository proto='file', user=None, pass=None, host=None, port=None, path='.../pytest-0/popen-gw3/test_repository_path0/%40repo'>.url

.../borg/testsuite/repository_test.py:101: AssertionError

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[ThomasWaldmann]

In the failing test, the repo url looks like:

file:///tmp/pytest-of-runner/pytest-0/test_repository_path0/%40repo

We have an issue discussing about urlquoting: #8585

From Gemini:

Handling the @ Character

According to RFC 3986, the @ character is a "sub-delimiter" and is technically allowed to appear unencoded within a path segment.

However, in many systems (especially in Python or when passing paths to CLI tools), you can safely use the percent-encoded version to avoid any ambiguity with the "userinfo" part of a URL (e.g., user@host).