Add lakeFS server version guard to `LakeFSFilesystem.touch()`

[nicholasjng]

Guards against attempted touch() operations by checking the backend version against the minimum supported backend version. This is preferable to the rather cryptic missing mime type 500 error from the backend in lakeFS server versions before v1.3.1.

Also adds a test mocking the server config to return an unsupported version. Skipping on old lakeFS server versions is currently not implemented, but lower prio, since the CI runs on the latest Docker image.

Fixes #208.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (ad8437a) 89.80% compared to head (6a713ca) 90.01%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #214 +/- ## ========================================== + Coverage 89.80% 90.01% +0.21% ========================================== Files 7 7 Lines 520 531 +11 Branches 82 85 +3 ========================================== + Hits 467 478 +11 Misses 27 27 Partials 26 26 ```

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[AdrianoKF]

Skipping on old lakeFS server versions is currently not implemented, but lower prio, since the CI runs on the latest Docker image.

@pytest.mark.xfail can take a boolean argument condition, which we could use to mark the test case as an expected failure in case of server versions <1.3.1.

[nicholasjng]

Skipping on old lakeFS server versions is currently not implemented, but lower prio, since the CI runs on the latest Docker image.

@pytest.mark.xfail can take a boolean argument condition, which we could use to mark the test case as an expected failure in case of server versions <1.3.1.

Do you know of a way of skipping a test based on a fixture value? I was looking through the docs and found nothing. My idea is this:

@pytest.skipif(lakefs_version < (1, 3, 1), reason="fs.touch() is not supported on old lakeFS server versions")
def test_touch():
    ...

[AdrianoKF]

Skipping on old lakeFS server versions is currently not implemented, but lower prio, since the CI runs on the latest Docker image.

@pytest.mark.xfail can take a boolean argument condition, which we could use to mark the test case as an expected failure in case of server versions <1.3.1.

Do you know of a way of skipping a test based on a fixture value? I was looking through the docs and found nothing. My idea is this:

@pytest.skipif(lakefs_version < (1, 3, 1), reason="fs.touch() is not supported on old lakeFS server versions")
def test_touch():
    ...

You could also call pytest.xfail() (I'd argue for xfail(raises=...) over skipif, so we get to validate the correct exception is thrown) inside the test case, where you have access to the fixture value. I also couldn't find any other solution from a quick web search.