I just ran into a `OSError: [Errno 28] No space left on device` when trying to emerge gentoo-sources-6.10.3, because 3 GiB do not suffice on /var/tmp/portage. The work/ directory in /var/tmp/portage/… sums up to 1.6G now, and when copying all over to image/, we obtain a substantial footprint on /var/tmp/portage. The question is whether a CHECKREQS_DISK_BUILD should be set up with twice the size reported by `xz -l linux-${KV_MAJOR}.${KV_MINOR}.tar.xz` or so, which is a lower bound on the required disk space. It would be generic and fast to check and useful. p.s. It would actually be great if the installation phase to image/ would circumvent doubling the disk footprint. Reproducible: Always