Hey Ludo,
> While I agree this should be factorize, I wonder if this should be > promoted to (guix compression). The module name intuitively is a better > fit for the compression-related things currently in (guix utils). > > Not sure, maybe (gnu compression) would make more sense? Thanks for noticing that. I moved this module to (gnu compression), checked that make as-derivation is working and updated the wip-image branch accordingly. Mathieu