Let's check for CAP_SYS_ADMIN instead of root for these, and make unmounting more graceful if we can't access the backing loop device because of permission issues. This allows mounting and unmounting images from an unprvileged mount namespace. The actual files in the image will end up owned by nobody:nobody because we'll be in an unprivileged user namespace, but assuming the directory permissions are not too strict, this still allows interacting with the image in useful ways.
System and Service Manager
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