#!/bin/bash

# Creates backups of /storage/docker/
set -e

# Define paths and date format
DOCKERPATH="/storage"
DOCKERDIR="docker"
DATE=$(date "+%Y-%m-%d_%H-%M")

SUBDIR="${HOME}/compose_backups"

mkdir -p ${SUBDIR}

# Output the current date for reference
echo "Backup Date: $DATE"

# Find files within the docker directory up to 3 levels deep and less than 500k in size
FILES=$(cd ${DOCKERPATH} && find ${DOCKERDIR} -maxdepth 2 -type f -size -500k)

# Assert that files are non-empty
if [ -z "$FILES" ]; then
  echo "No files found to back up."
  exit 1
fi

# Create archive with the form: $(DATE)_$(UNIX_TIME)_dockerfiles_backup.tar.gz
ARCHIVE_NAME="compose_backups_${DATE}.tar.gz"

# Create the tar archive
tar -C ${DOCKERPATH} -czf "${SUBDIR}/${ARCHIVE_NAME}" ${FILES}

echo "Backup created: ${ARCHIVE_NAME}"