issues: 547925778

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
547925778 MDU6SXNzdWU1NDc5MjU3Nzg= 3680 broken output of `find_root_and_group` for h5netcdf 5821660 closed 0     4 2020-01-10T08:02:06Z 2022-01-12T08:23:37Z 2020-01-23T06:36:25Z MEMBER      

MCVE Code Sample

```python

Your code here

import netCDF4 import h5netcdf import xarray from xarray.backends.common import find_root_and_group root = netCDF4.Dataset("test.nc", "w", format="NETCDF4") test1 = root.createGroup("test1") test1.createGroup("test2") root.close() h5n = h5netcdf.File('test.nc') print(find_root_and_group(h5n['test1'])[1]) h5n.close() ```

This will output: //test1//test1/test2

Expected Output

/test1/test2

Problem Description

I stumbled over this while working on #3618. Although the function claims to retrieve root and group name of netCDF4/h5netcdf datasets the output for h5netcdf is broken.

Output of xr.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.8.0 | packaged by conda-forge | (default, Nov 22 2019, 05:03:59) [GCC 7.3.0] python-bits: 64 OS: Linux OS-release: 4.12.14-lp151.28.36-default machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: de_DE.UTF-8 LOCALE: de_DE.UTF-8 libhdf5: 1.10.5 libnetcdf: 4.7.3 xarray: 0.14.1+43.g3e9d9046.dirty pandas: 0.25.3 numpy: 1.17.3 scipy: 1.3.3 netCDF4: 1.5.3 pydap: None h5netcdf: 0.7.4 h5py: 2.10.0 Nio: None zarr: None cftime: 1.0.4.2 nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: None dask: 2.8.0 distributed: 2.9.0 matplotlib: 3.1.2 cartopy: 0.17.0 seaborn: None numbagg: None setuptools: 42.0.2.post20191201 pip: 19.3.1 conda: None pytest: 5.3.1 IPython: 7.10.2 sphinx: 2.3.1 
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   completed 13221727 issue

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