update_ds1_replica.sh

#!/bin/sh

# Updates a replica of the ds1 dataset.
#
# Ideally we'd use bookmarks instead of snapshots to track the starting point
# of incremental sends, but OpenZFS 2.0.0 doesn't support sending multiple
# datasets from the same bookmark (and I don't feel like rewriting all of the
# functionality of zfs send -R).
#
# Usage: update_ds1_replica <dest_pool>

set -e

SRC_POOL=tank
DS=ds1

dest_pool=$1

if [ -z "$dest_pool" ]; then
        >&2 echo "Usage: update_ds1_replica <dest_pool>"
        exit 1
fi

if ! zpool list $dest_pool >/dev/null; then
        >&2 echo "Destination pool ${dest_pool} not available"
        exit 1
fi

snapshot="${SRC_POOL}/${DS}@${dest_pool}"
snapshot_new="${snapshot}-new"

zfs snapshot -r $snapshot_new
zfs send -RwI $snapshot $snapshot_new | pv | zfs recv -F "${dest_pool}/${DS}"

zfs destroy -R $snapshot
zfs rename -r $snapshot_new $snapshot