issues: 902031342

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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
902031342 MDU6SXNzdWU5MDIwMzEzNDI= 5377 xr.tutorial.open_dataset should work even with locally preloaded cache. 198999 open 0     3 2021-05-26T08:51:02Z 2021-05-26T16:04:04Z   NONE      

What happened: When packaging for a Linux distribution (openSUSE in my case) there is no network access to the build machines for obvious reasons. Therefore we are very happy to preloaded cache and xr.tutorial.open_dataset() function. Unfortunately, with 0.18.2 (not sure about the previous versions) it doesn’t work, because pooch.retrieve() without fname parameter (even when known_hash is None) generates unique name for the data file, which is not available, therefore it fails.

With the data directory expanded to ~/.cache/xarray_tutorial_data call of xr.tutorial.open_dataset('air_temperature') should return the appropriate data even without the network access.

This patch fixes that. When the datafile could be found in the local cache, pooch.retrieve is called with fname parameter.

 
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