#!/bin/bash

ARCHIVE=/backup
REPO=local
HOST=localhost
USERNAME=Administrator
PASSWORD=password
THREADS=4
RESTOREPOINTS=3

CBBACKUPMGR=/opt/couchbase/bin/cbbackupmgr
BACKUPREGEX="[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}_[0-9]{2}_[0-9]{2}.[0-9]{9}Z"

# Running backup
CMD="${CBBACKUPMGR} backup --archive ${ARCHIVE} --repo ${REPO} --host couchbase://${HOST} --username ${USERNAME} --password ${PASSWORD} --threads ${THREADS}"
echo -e "Running backup...\nCommand: ${CMD}"
$CMD

# Compacting the backup
BACKUPLIST=$(${CBBACKUPMGR} list --archive ${ARCHIVE} --repo ${REPO} | awk '{print $NF}' | grep -E ${BACKUPREGEX})
LASTBACKUP=$(echo "${BACKUPLIST}" | sed '$!d')
CMD="${CBBACKUPMGR} compact --archive ${ARCHIVE} --repo ${REPO} --backup ${LASTBACKUP}"
echo -e "Compacting the backup...\nCommand: ${CMD}"
$CMD

# Merging old backups
COUNT=$(echo "${BACKUPLIST}" | wc -l)

if [ "$COUNT" -gt "$RESTOREPOINTS" ]; then
  START=$(echo "${BACKUPLIST}" | sed -n 1p)
  END=$(echo "${BACKUPLIST}" | sed -n $((1+COUNT-RESTOREPOINTS))p)
  CMD="${CBBACKUPMGR} merge --archive ${ARCHIVE} --repo ${REPO} --start ${START} --end ${END}"
  echo -e "Merging old backups...\nCommand: ${CMD}"
  $CMD
fi