#!/usr/bin/env bash
#
# How to migrate data from a UGREEN NAS to TrueNAS SCALE with rsync
# https://www.zadran.net/guides/migrate-ugreen-nas-to-truenas-rsync
# Generated from the guide, last updated 2026-09-13.
#
# NO WARRANTY. This script is provided as is. You are responsible for
# understanding what it does before running it, and for the consequences.
# Take a backup first. See https://www.zadran.net/disclaimer
#
# Destructive steps are left commented out on purpose -- uncomment them
# only once you have understood what they do.

set -euo pipefail

# ---- Set these for your environment ----
# Something you will recognise in three days
SESSION_NAME='nas-migration'
# The account you SSH to the source as
SOURCE_USER='admin'
# Hostname or IP of the machine holding the data
SOURCE_HOST='nas-old.example.lan'
# Directory to copy from, without a trailing slash
SOURCE_PATH='/volume1/Shared'
# Where it lands, without a trailing slash
DEST_PATH='/mnt/tank/Shared'

tmux new -s ${SESSION_NAME}

tmux attach -t ${SESSION_NAME}

rsync -aHAX --partial --info=progress2 \
  ${SOURCE_USER}@${SOURCE_HOST}:${SOURCE_PATH}/ \
  ${DEST_PATH}/

tmux attach -t ${SESSION_NAME}

rsync -aHAX --partial --info=progress2 \
  ${SOURCE_USER}@${SOURCE_HOST}:${SOURCE_PATH}/ \
  ${DEST_PATH}/

rsync -aHAXn --itemize-changes \
  ${SOURCE_USER}@${SOURCE_HOST}:${SOURCE_PATH}/ \
  ${DEST_PATH}/ | head -50

# !! DESTRUCTIVE -- review, then uncomment to run:
# rsync -aHAX --delete --info=progress2 \
#   ${SOURCE_USER}@${SOURCE_HOST}:${SOURCE_PATH}/ \
#   ${DEST_PATH}/

tmux kill-session -t ${SESSION_NAME}