#!/usr/bin/env bash
set -euo pipefail
_fatal() { >&2 echo "ERROR: $*"; exit 1; }
mountpoint=$(zfs list -H -t filesystem -o mountpoint "$SANOID_TARGET")
[[ -n "$mountpoint" ]] || _fatal "expected non-empty $SANOID_TARGET"
snap_path="$mountpoint/.zfs/snapshot/$SANOID_SNAPNAME"
[[ -d "$snap_path" ]] || _fatal "expected to find a directory in $snap_path"
link_path="$mountpoint/.snapshot-latest"
ln -sf "$snap_path" "$link_path"
>&2 printf "successfully created %s -> %s\n" "$link_path" "$snap_path"