Resources not found when nested in zip file

[jaraco]

In GitLab by @jaraco on Jun 29, 2020, 12:30

In certifi/python-certifi#131, the user reports that creating a zipfile where the packages are in a subdirectory of the zipfile (e.g. site-packages/pkg), the resources fail to be found with FileNotFoundError('pkg/resource'). It seems that although Python supports paths like local/file.zip/site-packages on sys.path, importlib-resources does not when using the legacy API. When using the files API, those paths are supported.

[jaraco]

In GitLab by @jaraco on Jun 29, 2020, 12:34

mentioned in commit c970b2d331ac0282aeac49e8ce9f28d3b530bb81

[jaraco]

In GitLab by @jaraco on Jun 29, 2020, 12:35

mentioned in commit 9403a94

[jaraco]

In GitLab by @jaraco on Jun 29, 2020, 12:44

In 9403a94, I've created a unit test to capture the expectation. It fails only one test for is_resource, but we know from the upstream issue that the issue is broader (perhaps only on CPython).

Since the files API is not implicated, I'm going to recommend focusing our energy instead on migrating the legacy API to leverage the files API, such as in #80.

[jaraco]

Since the files API supports this, I'm not going to invest any additional energy on it.