lnd-backup.sh

#!/bin/bash

CONF="$HOME/.lnd-backup.conf"

if [[ "$1" == "-h" || "$1" == "--help" ]]; then
	echo "Create configuration file at '${CONF}' with the below variables:"
	echo
	echo "LND_PATH	path to lnd configuration directory, can be absolute or relative to current working directory"
	echo "REMOTE_PATH	ssh-compatible specification to the directory where backup will be uploaded via scp"
	echo "TMP_DIR		temporary directory for caching encrypted files, will be created if it does not exist, e.g.: /tmp/backup-lnd"
	echo "PASSPHRASE	symmetric encryption passphrase"
	exit
fi

if [[ ! -f "${CONF}" ]]; then
	echo "Could not find configuration file at '${CONF}'."
	exit
fi

source "${CONF}"

while true; do

    inotifywait "${LND_PATH}/data/chain/bitcoin/mainnet/channel.backup"

    TODAY=$(date +%Y-%m-%d)
    mkdir -p "${TMP_DIR}"
    echo "${PASSPHRASE}" | gpg --batch --yes --passphrase-fd 0 \
        --output "${TMP_DIR}/${TODAY}_channel.backup.enc" \
        --symmetric --cipher-algo AES256 \
        "${LND_PATH}/data/chain/bitcoin/mainnet/channel.backup"

    scp "${TMP_DIR}/${TODAY}_channel.backup.enc" "${REMOTE_PATH}"

    rm -rf "${TMP_DIR}"

done