s3_backup.sh

#!/bin/bash


######
# this script uses s3cmd from http://s3tools.org/s3cmd to sync a folder in linux to s3
#
# make sure that you have configured s3cmd by running s3cmd --configure
#
# this script is usally kept in a cron to be run every x amount of hours
######

# s3cmd binary location
readonly S3CMD='/usr/local/bin/s3cmd'

# optionns needs to pass to the s3cmd
readonly S3CMD_OPTIONS='sync --recursive'

# source folder to backup
readonly BACKUP_PATH='/tmp/foo'

# s3 bucket where to backup
readonly BUCKET='s3://bullshit_crap'

# getting script name for logging
readonly PROGNAME=$(basename $0)


# logging messages to the system's standard location

log_message() {
    message=$1
    logger -i -s -t ${PROGNAME} ${message}
}


# check if s3cmd exists

if [[ -z ${S3CMD} ]];then
    printf "\ns3cmd not found.\nInstall s3cmd from http://s3tools.org/s3cmd\n"
    exit 1
fi

# check if source directory exists

if [[ ! -d ${BACKUP_PATH} ]];then
    printf "\n source backup path ${BACKUP_PATH} doesnt exists\n"
    log_message "${BACKUP_PATH} does not exists"
    exit 1
fi

# checkig if the source directory is empty or not

if [ "$(ls -A $BACKUP_PATH)" ]; then
    echo "Syncing ${BACKUP_PATH} in S3 bucket named ${BUCKET}"
    log_message "Syncing ${BACKUP_PATH} in S3 bucket named ${BUCKET}"

    # executing the s3cmd sync command

    ${S3CMD} ${S3CMD_OPTIONS} ${BACKUP_PATH} ${BUCKET}

    if [[ $? -eq 1 ]];then
        printf "\n S3 Sync was not successful. Please run the command manually\
            and look for problem\n"
        log_message "${PROGNAME} was not successful"
        exit 1
    else
        echo "S3 Sync was successful. Deleting the local files"
        log_message "S3 Sync was successful.Removing files from ${BACKUP_PATH}"
        rm ${BACKUP_PATH}/*
    fi
else
    echo "Source Directory ${BACKUP_PATH} is empty"
    log_message "${BACKUP_PATH} is empty"
    exit 1
fi