xtrabackup/files/innobackupex-server-restore-call.sh

{%- from "xtrabackup/map.jinja" import server with context -%}
#!/bin/bash

# This script returns appropriate backup that client will restore
set -eo pipefail

BACKUPDIR="{{ server.backup_dir }}" # Backups base directory
FULL="$(find $BACKUPDIR/full -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -$1 | tail -1)"
FULL_INCR="$(find $BACKUPDIR/incr -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -$1 | tail -1)"
BEFORE_NEXT_FULL_INCR="$(find $BACKUPDIR/incr -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -$(( $1 - 1 )) | tail -1 || true)"

function prerequisites(){
  if [ $1 -eq 0 ]; then
    echo "No arguments provided"
    exit 1
  fi

  # if arg is not an integer
  case $2 in
    ''|*[!0-9]*) echo "Argument must be integer"; exit 1 ;;
    *) ;;
  esac
}

function return_backup(){
  if [ -z "$BEFORE_NEXT_FULL_INCR" ]; then
    BEFORE_NEXT_FULL_INCR="Empty"
  fi
  if [ "$FULL" == "$FULL_INCR" ]; then
    LATEST_FULL_INCR=$(find $BACKUPDIR/incr/$FULL_INCR -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -1 | tail -1)
    echo "$BACKUPDIR/incr/$FULL/$LATEST_FULL_INCR"
    elif [ $FULL = $BEFORE_NEXT_FULL_INCR ]; then
    LATEST_FULL_INCR=$(find $BACKUPDIR/incr/$BEFORE_NEXT_FULL_INCR -mindepth 1 -maxdepth 1 -type d -printf "%P\n" | sort -nr | head -1 | tail -1)
    echo "$BACKUPDIR/incr/$FULL/$LATEST_FULL_INCR"
  else
    echo "$BACKUPDIR/full/$FULL"
  fi
}

prerequisites "$#" "$1"
return_backup