The request is not supported

Development
1

Locally, and on windows-2025 (1.23 and 1.24), the TestCopyRange test is failing with The request is not supported.

run tests on all windows runners · rasa/syncthing@aedaa78 · GitHub shows:

=== RUN   TestCopyRange
=== RUN   TestCopyRange/tmp
=== RUN   TestCopyRange/tmp/duplicate_extents
=== RUN   TestCopyRange/tmp/duplicate_extents/append_to_end
    filesystem_copy_range_test.go:339: The request is not supported.
--- FAIL: TestCopyRange/tmp/duplicate_extents/append_to_end (0.02s)
=== RUN   TestCopyRange/tmp/duplicate_extents/append_to_end_offsets_at_start
    filesystem_copy_range_test.go:339: The request is not supported.
--- FAIL: TestCopyRange/tmp/duplicate_extents/append_to_end_offsets_at_start (0.02s)
=== RUN   TestCopyRange/tmp/duplicate_extents/overwrite_part_of_destination_region
    filesystem_copy_range_test.go:339: The request is not supported.
--- FAIL: TestCopyRange/tmp/duplicate_extents/overwrite_part_of_destination_region (0.02s)
=== RUN   TestCopyRange/tmp/duplicate_extents/overwrite_all_of_destination
    filesystem_copy_range_test.go:339: The request is not supported.
--- FAIL: TestCopyRange/tmp/duplicate_extents/overwrite_all_of_destination (0.02s)
=== RUN   TestCopyRange/tmp/duplicate_extents/overwrite_part_of_destination
    filesystem_copy_range_test.go:339: The request is not supported.
--- FAIL: TestCopyRange/tmp/duplicate_extents/overwrite_part_of_destination (0.02s)
=== RUN   TestCopyRange/tmp/duplicate_extents/destination_gets_expanded_as_it_is_being_written_to
    filesystem_copy_range_test.go:339: The request is not supported.
2

What is windows 2025?

The tests assume certain filesystem semantics on windows, perhaps the filesystem you are on (or the os) does not support it, hence failures are expected.

3

On Windows, this works only on specific filesystems (other than NTFS), so the use case is extremely niche. I think I did the test on ReFS under Windows Server when the feature was first being implemented to check if it actually functions as intended.

See https://docs.syncthing.net/advanced/folder-copyrangemethod.

4

Sorry if I wasn’t clear, windows-2025 is the latest GitHub runner (though windows-latest refers to the windows-2022 runner). The test also fails locally on Windows 11.

This test does not fail on NTFS on either the windows-latest or the windows-2019 runners, so something changed. So, either Windows 11/windows-2025 now require an ReFS filesystem, a different error is now being returned, or support was dropped.

If given the go ahead, I can craft a PR thats runs the test on a ReFS-formatted .VHDX, to see if that fixes it.

5

I fixed this in a one-line PR in fix(tests): fix error check on Windows 2025 (fixes #10164) by rasa · Pull Request #10165 · syncthing/syncthing · GitHub

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