When building a Guix System VM (qcow2) image from an operating system file containing the following file systems
(file-systems (append (list (file-system (device (file-system-label "my-root")) (mount-point "/") (type "ext4"))) %base-file-systems)) the resulting image will not have the label “my-root”. When booting the virtual machine and reconfiguring with the configuration file (as saved by “--save-provenance”) Guix will complain about the fact that there is no disk with the given label. -- Ricardo