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cb47d83b72
Similar to /tmp, applications might well use /dev/shm as an IPC rendezvous between instances, which wouldn't have worked without --device=shm until now. Because /dev/shm has specific characteristics (in particular it's meant to always be a tmpfs), we offload the actual storage into a subdirectory of the real /dev/shm. Because /dev/shm is a shared directory between all uids, we have to be extra-careful how we do this, which is why the test coverage here is important. This is done on an opt-in basis because of its extra complexity. Signed-off-by: Simon McVittie <smcv@collabora.com>