GetImageMetadata() and GetImageMetadataWithExtensions() ask polkit before inspecting an image that is specified by path, because inspecting loop-mounts the image as root. Extension images aren't authenticated at all, so any local user can make portabled set up loop devices for files they choose, probe them and mount them, by passing them as extensions of an installed image. Let's ask polkit for the inspect-images action if any extension image is specified by path, like we do for the image itself.
System and Service Manager
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