Right now Drupal is unusable with filesystem (POSIX) ACLs. It's been broken for years. This was previously 🐛 ./sites/default/files directory permission check is incorrect during install AND status report (affects Docker on Windows) Needs work and #1333390: file_prepare_directory() / is_writable() on Linux don't support ACLs → which are/were doomed to failure.
file_prepare_directory('public://', FILE_CREATE_DIRECTORY). For instance, install the IMCE module and open its file browser from your "My Account" page.Anything that calls file_prepare_directory('public://', FILE_CREATE_DIRECTORY) will fail, claiming that the directory (sites/default/files) is not writable.
Postponed
7.0 ⚰️
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