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Check NixOS configurations / eval-hosts (pull_request) Successful in 10m20s
nixos-install bind-mounts /dev, /proc, /sys (and usually /run) into /mnt to run the target's activation script in a chroot, and doesn't unmount them again afterward. Left in place, those nested mounts made ZFS refuse to unmount its own root dataset at /mnt: zpool export failed with "cannot unmount '/mnt': pool or dataset busy", and because of this script's set -e, that killed the script before it ever reached reboot -- silently defeating the export-before-reboot fix from #40 on every real run, which is why the ZFS-import stall kept recurring.