What needs to get done

If access to XDG_RUNTIME_DIR fails with a permission error, the state service should either raise a user-friendly error and recommend using CRAFT_STATE_DIR or fall back to util.get_home_temporary_directory().

Why it needs to get done

Craft application raises an internal error when it fails to create a directory here:

source:

• https://treeherder.mozilla.org/logviewer?job_id=523533578&repo=autoland&task=GPQD26JzTRmaea_iieaqpA.0&lineNumber=233457
• https://matrix.to/#/!GGqzbFAUQprdPgYYCM:ubuntu.com/$zsIwY7Ln07TlXoNsY_WY-eQSSAXitSBqWga4ZMOwViM?via=ubuntu.com&via=matrix.org&via=kde.org