#!/bin/sh

BACKUP_DATE=$(date +"%Y-%m-%d")
BACKUP_BASENAME=$S3_BUCKET_NAME$BACKUP_DATE.tar
SKIP_XZ=${ONLY_TAR:-0}

month_day=`date +"%d"`

if [ $SKIP_XZ -ne 0 ]; then
  TAR_PARAM=
  BACKUP_FILENAME=daily_$BACKUP_BASENAME
  BACKUP_FILENAME_MONTHLY=monthly_$BACKUP_BASENAME
else
  TAR_PARAM=-J
  BACKUP_FILENAME=daily_$BACKUP_BASENAME.xz
  BACKUP_FILENAME_MONTHLY=monthly_$BACKUP_BASENAME.xz
fi

healthchck_fail(){
	if [ -n $HEALTHCHECK_URL ]; then
	 	curl -X POST --data $1 --retry 3 $HEALTHCHECK_URL/fail  --silent --output /dev/null
		exit 1
	fi
}

healthchck_start(){
	if [ -n $HEALTHCHECK_URL ]; then
	 	curl -X POST --data $1 --retry 3 $HEALTHCHECK_URL/start  --silent --output /dev/null
	fi
}

healthchck_ok(){
	if [ -n $HEALTHCHECK_URL ]; then
	 	curl -X POST --data $1 --retry 3 $HEALTHCHECK_URL --silent --output /dev/null
	fi
}

healthchck_start "Starting Backup"
cd /backup
echo "make archive"
FROMPATH='./'
FROMSIZE=$(du -sk ${FROMPATH} | cut -f 1);
CHECKPOINT=$(echo ${FROMSIZE}/50 | bc);
echo "Estimated: [==================================================]";
echo -n "Progess:   [";
(tar -c --exclude=${BACKUP_FILENAME} --record-size=1K --checkpoint="${CHECKPOINT}" --checkpoint-action="ttyout=>" -f - "${FROMPATH}" | xz > "${BACKUP_FILENAME}") || healthchck_fail  "TAR Failed"
echo "]"
cd /
echo " done"

RECIPIENT=$(echo "$GPG_RECIPIENT" | sed "s/,/ --recipient /")

echo "encrypting"
gpg --trust-model always --enable-progress-filter --output ~/$BACKUP_FILENAME.gpg --encrypt --recipient $RECIPIENT ~/$BACKUP_FILENAME || healthchck_fail "Encryption Failed"
rm ~/$BACKUP_FILENAME

echo "uploading"
aws s3 cp ~/$BACKUP_FILENAME.gpg s3://$S3_BUCKET_NAME/$BACKUP_FILENAME.gpg --storage-class STANDARD_IA || healthchck_fail "Upload Failed"
rm ~/$BACKUP_FILENAME.gpg
echo "done"

# On first month day do
if [ "$month_day" -eq 1 ] ; then
  echo "make monthly backup"
  aws s3 cp s3://$S3_BUCKET_NAME/$BACKUP_FILENAME.gpg s3://$S3_BUCKET_NAME/$BACKUP_FILENAME_MONTHLY.gpg --storage-class DEEP_ARCHIVE || healthchck_fail "failed to create monthly backup"
fi
healthchck_ok "Success"