#!/bin/sh
#
# Don't use this script, just use rbd migrate X, this doesn't persist any snapshots

sourcepool="$1"
destpool="$2"
destdatapool="${3:-$destpool}"
snapname="${4:-premigrate}"

checkdep() {
	if ! which "$1" >/dev/null; then
		echo "Missing $1 support"
		exit 1
	fi
}

checkdep "rbd"
checkdep "jq"

for img in $(rbd -p "$sourcepool" ls); do
	if ! rbd -p "$sourcepool" status --format json "$img" | jq -e '.watchers[]'; then
		echo "Migrating $img"
		if rbd -p "$sourcepool" snap add "$img"@"$snapname"; then
			rbd -p "$sourcepool" --dest-pool "$2" --data-pool "$3" clone "$img"@"$snapname" "$img"
			rbd -p "$destpool" flatten "$img"

			# Cleanup
			rbd -p "$sourcepool" snap rm "$img"@"$snapname"
			#rbd -p "$sourcepool" rm "$img"
		fi
	fi
done