bashclub-zfs-push-pull/backup-boot

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#!/bin/sh
# Main system backups are carried out via ZFS send/receive,
# but that won't pick up /boot.
set -e
# ensure /boot is the real deal
mountpoint -q /boot || (echo "/boot is not a mountpoint" >&2; exit 1)
# bind mount / to a temporary path
fakeroot=$(mktemp -d)
mount --bind / $fakeroot
# copy the /boot filesystem into /'s boot/
rsync -a --delete /boot/ $fakeroot/boot/
# clean up
umount $fakeroot
rmdir $fakeroot