The update_manager_file_get() function checks the argument url against a small hard-coded list of remote file schemes, and assumes that all other URIs may be resolved to paths on the local filesystem. This assumption is wrong and unnecessary. The code may be made simpler and more robust by simply passing the URI to \Drupal::service('file_system')->realpath() A return value of FALSE indicates that the scheme does not support translation to a local filesystem path.
The code should be modified as described above.
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9.5
Used to track the progress of issues reviewed by the Drupal Needs Review Queue Initiative.
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Now that 📌 Deprecate/remove the ability to update a module from a URL and authorize.php Active and child issues are done, this code is all deprecated and will be removed in D12.