gistfile1.txt

#!/bin/bash
# Fill Disk with random data for testing

myname=`basename $0`
usage() {
  echo "Usage: $myname [-d dircount] [-f filecount] [-b maxblockcount] [-s blocksize] [-v] [-q] [-h]"
  exit 0
}

help() {
  echo "${myname} - Fill Disk with random data for testing"
  cat << EOF
  options:
    -d <num> : set max number of dirs to create
    -f <num> : set max number of files to create
    -b <num> : set max count of blocks per file (gets multiplied by 1024)
    -s <str> : set dd blocksize like 4M for 4 MBytes
    -v       : set verbose mode
    -q       : set quiet mode (writes all output to logfile)
    -h       : give this help

  defaults: fill_disk -d 50 -f 50 -b 8 -s 1M"
EOF
  exit
}

# set defaults
dirmax=50
filemax=50
blockmax=8
blocksize=1M
verbose=0
quiet=0

# random stream of data
cdz="cat /dev/zero"
ose="openssl enc -aes-256-ctr -pass pass:testing123 -iter 3"
ddcmd="dd iflag=fullblock "

# get options and params
while getopts ":d:f:b:s:hvq" flag; do
  case "${flag}" in
    d) dirmax=${OPTARG};;
    f) filemax=${OPTARG};;
    b) blockmax=${OPTARG};;
    s) blocksize=${OPTARG};;
    v) verbose=1;;
    q) quiet=1;;
    h) help ;;
    :) echo "Error: -${OPTARG} requires an argument."; usage;;
    *) echo "Invalid option: ${OPTARG}"; usage;;
  esac
done
if ((verbose)); then
  echo "Creating $dirmax directories each containing $filemax files with max blockcount of $blockmax and a blocksize of $blocksize"
  ddcmd+=" status=progress"
  quiet=0
fi

if ((quiet)); then
  logfile="fill_disk.log"
  touch $logfile
  exec 1>$logfile
  exec 2>$logfile
  logdate=$(date '+%F %T')
  echo "${logdate}: fill_disk script started in quiet mode."
  echo "Creating $dirmax directories each containing $filemax files with max blockcount of $blockmax and a blocksize of $blocksize"
  verbose=0
fi

for ((d=1; d<=$dirmax; d++)); do
  testdir="TestDir_$(cat /proc/sys/kernel/random/uuid)"
  logdate=$(date '+%F %T')
  echo "${logdate}: creating dir ${testdir}."
  mkdir -p $testdir
  for ((f=1; f<=$filemax;f++)); do
    bc=$(( ((f%blockmax)+1)*4096 ))
    testfile="${testdir}/TestFile_${f}.dat"
    if [ -f $testfile ]; then
      if ((verbose)); then
        echo "Skipping file: ${testfile} as it already exists."
      fi
    else
      logdate=$(date '+%F %T')
      echo "${logdate}: writing testfile: $testfile with $bc blocks of $blocksize"
      $cdz | $ose | $ddcmd bs=$blocksize count=$bc of=$testfile
      ddstatus=$?
      if (( $ddstatus )); then
        logdate=$(date '+%F %T')
        echo "${logdate}: dd ended with errorcode: $ddstatus"
        break 2
      fi
    fi
  done  #
done # d
logdate=$(date '+%F %T')
echo "${logdate}: fill_disk run completed."