wiki.selfprivacy.org/src/nixos/chroot.md

Entering nixos chroot from rescue

mount /dev/sda1 /mnt

mount -o bind /dev /mnt/dev

mount -o bind /proc /mnt/proc

mount -o bind /sys /mnt/sys

chroot /mnt /nix/var/nix/profiles/system/activate

cp /etc/resolv.conf /mnt/etc/

chroot /mnt /run/current-system/sw/bin/bash

Use --option sandbox false when nixos-rebuild