Hello, There seems to be a recent regression:
--8<---------------cut here---------------start------------->8--- $ cat mini-os.scm (use-modules (gnu)) (operating-system (host-name "mini-1") (bootloader (bootloader-configuration (bootloader grub-bootloader) (targets '("/dev/sda")))) (file-systems (cons (file-system (device (file-system-label "my-root")) (mount-point "/") (type "ext4")) %base-file-systems)) (kernel-arguments (list "console=tty0 console=ttyS0,115200"))) $ guix system image mini-os.scm [...] building /gnu/store/99wmrm4ali4f4pnii21rlhjvpfds762j-boot.drv... building /gnu/store/6gra5cyiilyv3dm3jc7yhkga0kygblhn-system.drv... building /gnu/store/xf50b8cm7ida4rgxp2q69vp2jhsl3kzp-grub.cfg.drv... building /gnu/store/69nhv7idhf1i7a3j8pdchkdd5jj5fl7l-partition.img.drv... building /gnu/store/74sxq3x9gwq0wlwqrrs0lqkr0n14p1kd-partition.img.drv... building /gnu/store/dnqxyq1x7fd5131rby4z46rx8wkzw1k6-genimage.cfg.drv... building /gnu/store/rvq9sqk55qwk27j8m3gjhba7f4zjid2k-disk-image.drv... -builder for `/gnu/store/rvq9sqk55qwk27j8m3gjhba7f4zjid2k-disk-image.drv' failed with exit code 1 build of /gnu/store/rvq9sqk55qwk27j8m3gjhba7f4zjid2k-disk-image.drv failed View build log at '/var/log/guix/drvs/rv/q9sqk55qwk27j8m3gjhba7f4zjid2k-disk-image.drv.gz'. guix system: error: build of `/gnu/store/rvq9sqk55qwk27j8m3gjhba7f4zjid2k-disk-image.drv' failed $ zcat /var/log/guix/drvs/rv/q9sqk55qwk27j8m3gjhba7f4zjid2k-disk-image.drv.gz | tail -20 INFO: hdimage(image): writing GPT INFO: hdimage(image): writing protective MBR INFO: hdimage(image): writing MBR /gnu/store/0f4z2i472rfd3qphl82j7jm49qgm672d-grub-2.06/sbin/grub-bios-setup: error: cannot find a device for . (is /dev mounted?). Backtrace: 2 (primitive-load "/gnu/store/i6khnb475pxagfvjwnhi09z07n5?") In ice-9/eval.scm: 619:8 1 (_ #(#<directory (guile-user) 7ffff77f7c80> ("/gn?" ?) ?)) In ./guix/build/utils.scm: 812:6 0 (invoke "/gnu/store/0f4z2i472rfd3qphl82j7jm49qgm672d-g?" ?) ./guix/build/utils.scm:812:6: In procedure invoke: ERROR: 1. &invoke-error: program: "/gnu/store/0f4z2i472rfd3qphl82j7jm49qgm672d-grub-2.06/sbin/grub-bios-setup" arguments: ("-m" "device.map" "-r" "hd0,msdos2" "-d" "." "images/image") exit-status: 1 term-signal: #f stop-signal: #f environment variable `PATH' set to `/gnu/store/n31fw25l5yxq17x52mm7jjbvld58f8zd-genimage-15-1.ec44ae0/bin:/gnu/store/yr39rh6wihd1wv6gzf7w4w687dwzf3vb-coreutils-9.1/bin:/gnu/store/016lrymzc8a1rpx2p1app1awp2w2wlpk-findutils-4.9.0/bin:/gnu/store/nl2ddwgdw4mzghv6kzl6akg1s7p7yik8-qemu-minimal-7.2.1/bin' $ guix describe Generation 269 Jul 10 2023 00:17:51 (current) guix d2cf631 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: d2cf63165119fc78c9f52abce2ce66af23e49243 --8<---------------cut here---------------end--------------->8--- Conversely, it works with a commit from two weeks ago: --8<---------------cut here---------------start------------->8--- $ guix time-machine --commit=269cfe341f242c2b5f37774cb9b1e17d9aa68e2c -- system image mini-os.scm [...] building /gnu/store/k4r5d09slzl70sn4zbl0gpnzn1mb5ksy-system.drv... building /gnu/store/13z2cyi9n4isyrw5ashhcazy4ps8qffy-grub.cfg.drv... building /gnu/store/7sx021qpby1p57fqv5n5jkfz20qi9933-partition.img.drv... building /gnu/store/vw5n9q3z6k59mcsw7z4kb6ckp9bbc8nh-partition.img.drv... building /gnu/store/hq7lw7qm3fbl4fhlmqxxp9sw1v8h3h3m-genimage.cfg.drv... building /gnu/store/dil3qjisdkprw20kybr1bxmp6sid7g2v-disk-image.drv... /gnu/store/5lsi1wp59vwnk8rk2124y14p9r2fr9yc-disk-image --8<---------------cut here---------------end--------------->8--- A relevant difference seems to be GPT vs. MBR (the latter works, the former breaks): --8<---------------cut here---------------start------------->8--- $ cat $(guix build /gnu/store/hq7lw7qm3fbl4fhlmqxxp9sw1v8h3h3m-genimage.cfg.drv) |head -3 image image { hdimage { partition-table-type = "mbr" $ cat $(guix build /gnu/store/dnqxyq1x7fd5131rby4z46rx8wkzw1k6-genimage.cfg.drv) |head -3 image image { hdimage { partition-table-type = "gpt" --8<---------------cut here---------------end--------------->8--- The culprit might be 209204e23b39af09e0ea92540b6fa00a60e6a0ae, from <https://issues.guix.gnu.org/62223>. Josselin, Sergey, WDYT? Ludo’.