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mkdir /mnt/chroot
mount /path/to/cauldron /mnt/chroot
mount -o bind /dev  /mnt/chroot/dev
mount -o bind /proc /mnt/chroot/proc
mount -o bind /sys  /mnt/chroot/sys
# (the reason for bind mounts are that some packages/tools fails without them)
chroot /mnt/chroot
# (if you have the system split on several partitions (like separate
# /boot, /var, ...), do "mount -a" to get the rest of the mounts inside
# the chroot)
# as Thierry has pushed a revert you can do:
urpmi.update -a && urpmi grub2
# (or simply urpmi --auto-up to get all updates)
# otherwise wget <package(s) needed> + urpmi/rpm/dnf ...
# then get out of chroot:
exit
# and reboot

#!/bin/bash
# myefichroot
[[ ${#1} > 0 ]] && [[ -e /dev/$1 ]] && [[ ${#2} > 0 ]] && \
[[ -e /dev/$2 ]] && [[ $UID = 0 ]] ||\
{ echo "Usage (as root)  - # myefichroot sd(root) sd(ESP)"; exit 0; }
mount /dev/$1 /mnt/
mount /dev/$2 /mnt/boot/EFI
for i in dev proc sys run; do
mount --bind /$i/ /mnt/$i/
done
chroot /mnt/
# Script will hang here during chroot
# exit chroot to unmount file system.
umount -l /mnt