#!/bin/bash
SCRIPTDIR=`dirname $(realpath $0)`
DEFAULTEXAMPLEFOLDER=${SCRIPTDIR}/../examplefolder
EXAMPLEFOLDER=$(realpath ${1:-$DEFAULTEXAMPLEFOLDER})
mkdir -p $EXAMPLEFOLDER 2>/dev/null
if [ ! -f lower1/Jan/01 ]; then
    mkdir $EXAMPLEFOLDER/lower1
    mkdir $EXAMPLEFOLDER/lower2
    mkdir $EXAMPLEFOLDER/upper
    mkdir $EXAMPLEFOLDER/merged
    mkdir $EXAMPLEFOLDER/workdir
    for month in 01-Jan 02-Feb 03-Mar 04-Apr; do 
        mkdir $EXAMPLEFOLDER/lower1/$month; for day in `seq -w 01 03`; do
            dd if=/dev/urandom of=$EXAMPLEFOLDER/lower1/$month/$day bs=1M count=1
        done
    done
    for month in 05-May 06-Jun 07-Jul 08-Aug; do 
        mkdir $EXAMPLEFOLDER/lower2/$month; for day in `seq -w 01 03`; do
            dd if=/dev/urandom of=$EXAMPLEFOLDER/lower2/$month/$day bs=1M count=1
        done
    done
fi
if ! mount | grep 'examplefolder/merged'; then
    sudo mount -t overlay overlay $EXAMPLEFOLDER/merged -olowerdir=$EXAMPLEFOLDER/lower1:$EXAMPLEFOLDER/lower2,upperdir=$EXAMPLEFOLDER/upper,workdir=$EXAMPLEFOLDER/workdir
fi
if [ ! -f $EXAMPLEFOLDER/merged/09-Sep ]; then
    for month in 09-Sep 10-Oct 11-Nov 12-Dec; do 
        mkdir $EXAMPLEFOLDER/merged/$month; for day in `seq -w 01 03`; do
            dd if=/dev/urandom of=$EXAMPLEFOLDER/merged/$month/$day bs=1M count=1
        done
    done
fi