backup

#!/bin/sh

set -e

BACKUP_PREFIX=${BACKUP_PREFIX:-backup}
BACKUP_DEST_FOLDER=${BACKUP_DEST_FOLDER:-/var/tmp/}
BACKUP_FIND_OPTIONS=${BACKUP_FIND_OPTIONS:?"BACKUP_FIND_OPTIONS are required"}
BACKUP_DELETE_LOCAL_COPY=${BACKUP_DELETE_LOCAL_COPY:-true}

BACKUP_AWS_KEY=${BACKUP_AWS_KEY:-}
BACKUP_AWS_SECRET=${BACKUP_AWS_SECRET:-}
BACKUP_AWS_S3_PATH=${BACKUP_AWS_S3_PATH:-}

# prepare unique name with date like 2015-09-04T03-40-34UTC
backup_time="$(date -Iseconds | sed 's/:/-/g')"
backup_src=${BACKUP_DEST_FOLDER}/src.${backup_time}
backup_archive=${BACKUP_DEST_FOLDER}/${BACKUP_PREFIX}.${backup_time}.tar.gz
# copy all filtes we want to backup to src
eval $(echo find ${BACKUP_FIND_OPTIONS}) > "${backup_src}"
# time to create an archive
tar -cvz \
    -f "${backup_archive}" \
    -T "${backup_src}"
# remove src file
rm "${backup_src}"
# upload to amazon s3
if [[ ${BACKUP_AWS_S3_PATH} ]]; then
    s3cmd \
        --access_key="${BACKUP_AWS_KEY:?'BACKUP_AWS_KEY is required'}" \
        --secret_key="${BACKUP_AWS_SECRET:?'BACKUP_AWS_SECRET is required'}" \
        put "${backup_archive}" \
        "${BACKUP_AWS_S3_PATH}"
fi
# remove backup file
if ${BACKUP_DELETE_LOCAL_COPY}; then
    rm "${backup_archive}"
fi