gnome-disk-image-mounter can be used to set up disk images. Both regular files and GVfs URIs (such as
smb://filer/media/file.iso) can be used in the URI parameter. If no URIs are given and a window server is
running, a graphical file chooser will be presented.
Note that gnome-disk-image-mounter will not mount filesystems or unlock encrypted volumes in the disk
image - this responsibility is left to the automounter in GNOME Shell to ensure that the same
interactions happen as if the disk image was a regular physical device or disc.
By default the disk images are attached read-only, use the option --writable to change this.