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Fix h5netcdf backend module detection and ros3 tests#11274

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kmuehlbauer wants to merge 8 commits intopydata:mainfrom
kmuehlbauer:h5netcdf-h5py-updates
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Fix h5netcdf backend module detection and ros3 tests#11274
kmuehlbauer wants to merge 8 commits intopydata:mainfrom
kmuehlbauer:h5netcdf-h5py-updates

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@kmuehlbauer kmuehlbauer commented Apr 1, 2026

This PR fixes two issues with upstream h5netcdf:

  • new ros3 endpoint, HDF5 version switch (HDF v2)
    This fixes breaking ROS3 tests, when using HDF2 >= 2. We currently do not check nightly h5netcdf, so this was missed here. It was discovered in h5netcdf tests, which is testing xarray nightly.
  • retrieve h5netcdf-backend module (h5py, h5pyd or pyfive) from backend variable
    This enables installation of xarray without h5py in the environment, as now the used module is discovered from h5netcdf backend variable.

@kmuehlbauer kmuehlbauer added the plan to merge Final call for comments label Apr 2, 2026
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Support pyfive as h5netcdf backend

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