Accept Path in esm_datastore

[aulemahal]

Change Summary

Cast paths to string before passing to fsspec.

Related issue number

Fixes #540.

Checklist

• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable

[andersy005]

Thank you for this fix, @aulemahal!

[andersy005]

It appears this PR is also impacted by the netCDF's thread safety issue reported in #548

[mgrover1]

@andersy005 - can we set the following

Folks using iris and hitting this issue you can workaround it by setting dask to single-threaded with:

import dask
dask.config.set(scheduler="single-threaded")

instead of pinning to netcdf4!=1.6.1.

for now?

[mgrover1]

That was mentioned in this issue Unidata/netcdf4-python#1192

and in the xarray repo pydata/xarray#7079

[mgrover1]

It appears this PR is also impacted by the netCDF's thread safety issue reported in #548

This has been fixed using the snippet I mentioned before... should be good for review

[andersy005]

thank you, @mgrover1 / @aulemahal