netcdf > 1.6.1 does not read .netrc / .dodsrc

[gauteh]

Hi,

To access CMEMS data-sources we use .netrc and .dodsrc, however it seems that versions post netcdf-1.6.1 no longer reads these files. Downgrading works fine. We use python-netcdf4 from conda-forge.

The issue seems to be present for ncdump and the likes as well.

Best regards, Gaute

Relevant issue: OpenDrift/opendrift#1083

[jswhit]

This must be due to a change in the C library, not netcdf4-python (that's why it also shows up in ncdump). I don't see anything in the netcdf-c Changelog though.

[dopplershift]

cc @WardF @DennisHeimbigner

[gauteh]

Maybe this issue: Unidata/netcdf-c#1966

[magnusuMET]

With nc_rc_set allowing one to set HTTP.NETRC we could do this automatically for more recent versions of netcdf4. There is precedent in netcdf4-python setting such options:

netcdf4-python/src/netCDF4/_netCDF4.pyx

Line 1318 in d203d8b

if nc_rc_set("HTTP.SSL.CAINFO", _strencode(certifi.where())) != 0: