MIGRATE THEM ALL

dev.sh

#!/usr/bin/env bash

# Script to migrate all local devices between balenaCloud environments. Steps: 

# 1. Scan for devices (Needs balenaCLI to be installed)
# 2. SSH into devices and convert all devices to development OS variant
# 3. Once complete, migrate devices to new target environement using balena join 
# 4. Shows migrated devices in the new target fleet 
# 5. Optionally you can convert all devices back to production OS variant after migration

BALENA_SOURCE_FLEET_TOKEN=
BALENA_SOURCE_FLEET_URL=balena-cloud.com
BALENA_TARGET_FLEET_TOKEN=
BALENA_TARGET_FLEET_URL=newbalenamachine.owned.by.me
BALENA_TARGET_FLEET_SLUG=vipulgupta2048/newest-fleet

# Command to convert devices to dev mode
devmode_on="tmp=$(mktemp)&& jq '.developmentMode="true"' /mnt/boot/config.json > "$tmp" && mv "$tmp" /mnt/boot/config.json && exit"

echo "Let the migration begin"

# Scan local devices available - ALL LOCAL DEVICES WILL BE PICKED UP
addresses=`sudo balena scan --json | jq -r '.[].address'`

# Split the addresses into an array
IFS=$'\n' read -d '' -ra address_array <<< "$addresses"
echo "${address_array[@]}"

#  Login to instance from where devices have to be migrated 
BALENARC_BALENA_URL=$BALENA_SOURCE_FLEET_URL balena login --token $BALENA_SOURCE_FLEET_TOKEN 
BALENARC_BALENA_URL=$BALENA_SOURCE_FLEET_URL balena whoami 

echo "If this isn't correct, stop now... waiting 5 seconds"
sleep 5

# Loop through the list of devices converting all to dev mode
for address in "${address_array[@]}"; do
    echo "Converting $address to dev mode" 
    echo 'bash -c "$devmode_on"' | BALENARC_BALENA_URL=$BALENA_SOURCE_FLEET_URL balena ssh "$address"
done

############## Once all devices are converted to development 
echo "********************************* Let the migration actually begin"

#  Login to instance that you want to migrate
BALENARC_BALENA_URL=$BALENA_TARGET_FLEET_URL balena login --token $BALENA_TARGET_FLEET_TOKEN 
BALENARC_BALENA_URL=$BALENA_TARGET_FLEET_URL balena whoami 

echo "if this isn't correct, stop now... waiting 5 seconds"
sleep 5

for address in "${address_array[@]}"; do
    BALENARC_BALENA_URL=$BALENA_TARGET_FLEET_URL balena join $address --fleet $BALENA_TARGET_FLEET_SLUG --pollInterval 10
    echo "Migrated $address to $BALENA_TARGET_FLEET_SLUG"
done


BALENARC_BALENA_URL=$BALENA_TARGET_FLEET_URL balena devices | grep "$BALENA_TARGET_FLEET_SLUG"


## Problems that you might face

# SSH: Process exited with non-zero status code "255"

# Are the SSH keys correctly configured in balenaCloud? See:
# https://www.balena.io/docs/learn/manage/ssh-access/#add-an-ssh-key-to-balenacloud
# Are you accidentally using `sudo`?

#  If you are seeing this ^^^ don't use sudo to start the script?