Mod update script for ARMA II on Linux

#!/bin/bash
#
# Mod Update script for linux
#
# by Dr.Pulp - www.FAKKer.de
# with modifications by Kindling
#
#
#
# READ FIRST!!!
#
# In order to use this script you need to have gunzip, convmv and rsync installed!
# Be sure to adjust the ARMA_DIR to point to your ARMA/OA game directory and ARMA_SYNC_DIR to point to an alternative storage directory.
#
##################################
# Configuration start            #
##################################

# ARMA II (for ARMA II) or Operation Arrowhead (for OA or CO) directory.
ARMA_DIR="/home/XXXX/.wine/drive_c/Program Files (x86)/Steam/steamapps/common/arma 2 operation arrowhead"

# Rsync storage directory for caching files - if this is removed, mods will need to be redownloaded in full to update.
# This will retain a copy of each mod to avoid problems caused by case-sensitive filesystems.
ARMA_SYNC_DIR=/home/XXXX/arma-temp

# Space-delimited list of available mirrors.
MIRRORLIST=(dev-heaven.net six.bssnet.dk zeus2.zeus-community.net)

# If parameters are passed to the script, use each parameter as a mod to download.
if  [ $# != 0 ]
  then MODS="$@"
else
# MODS contains mods that you'd like to synchronize if no parameters are given.
# For a complete list of available mods, check http://updater.dev-heaven.net/main
# Use the mod's name without the @, seperate multiple mods by spaces.
  MODS="rh_m14 ace acex cba cba_oa cba_a2 acex_ru acex_usnavy"
fi

##################################
# Advanced Configuration         #
##################################
RM="`which rm` -r"
RSYNC="`which rsync` --times -O --no-whole-file -r --delete --progress -h --exclude=.rsync rsync://"
CP="`which cp` -r"
GUNZIP="`which gunzip` -r"
CONVMV="`which convmv` --lower --notest"

##################################
# Configuration end              #
##################################

# Function: random mirror selection
RANDOM_MIRROR() {
MIRRORCOUNT=${#MIRRORLIST[*]}
MIRRORCOUNT=`expr $MIRRORCOUNT - 1`
MIRRORCOUNT=`expr 32767 / $MIRRORCOUNT`
MIRROR=${MIRRORLIST[$(($RANDOM/$MIRRORCOUNT))]}
}

if [ ! -d "$ARMA_DIR" ]
  then echo "ARMAII/OA directory does not exist!"
  exit
fi

if [ ! -d "$ARMA_SYNC_DIR" ]
  then echo "Rsync storage directory does not exist!"
  exit
fi

# Loop: deleting folder, rsync, decompress and copy for each mod you selected
for MOD in $MODS
do
  if [ -d "$ARMA_DIR/@$MOD" ]
    then $RM "$ARMA_DIR/@$MOD"
  fi
  INFOSYNC='Synchronising '$MOD'...'
  echo '   -------------------'
  echo $INFOSYNC
  OK=1
  BAILOUT=0
  until [ "$OK" -lt "1" ]
  do
    RANDOM_MIRROR
    $RSYNC$MIRROR/rel/$MOD/./.pack/ ${ARMA_SYNC_DIR}/@$MOD
    OK=$?
    BAILOUT=`expr $BAILOUT + 1`
    if [ "$BAILOUT" -gt 10 ]
    then
      ENDE='There was a problem during rsync of '$MOD' from '$MIRROR'! Aborting Script to prevent a loop. Check output directories and permissions or add more mirrors.'
      echo $ENDE
      exit
    fi
  done
  INFOCOPY='Copying '$MOD' to the destination folder...'
  echo $INFOCOPY
  $CP ${ARMA_SYNC_DIR}/@$MOD "${ARMA_DIR}"
  INFOZIP='Decompressing '$MOD'...'
  echo $INFOZIP
  $GUNZIP "${ARMA_DIR}/@$MOD/"*
done

# Converting filenames to lower case letters
$CONVMV "${ARMA_DIR}/@"*

# Copying keys mpmissions, store/userconfig and userconfig to the correct directories
for MOD in $MODS
do
  if test -e "${ARMA_DIR}/@$MOD/store/keys"
    then $CP "${ARMA_DIR}/@$MOD/store/keys/"* "${ARMA_DIR}/keys"
  elif test -e "${ARMA_DIR}/@$MOD/keys"
    then $CP "${ARMA_DIR}/@$MOD/keys/"* "${ARMA_DIR}/keys"
  else
    continue
  fi
  if test -e "${ARMA_DIR}/@$MOD/mpmissions"
    then $CP "${ARMA_DIR}/@ace/mpmissions/"* "${ARMA_DIR}/mpmissions"
  else
    continue
  fi
  if test -e "${ARMA_DIR}/@$MOD/userconfig"
    then
    if test -e "${ARMA_DIR}/userconfig/$MOD"
      then
      $CP "${ARMA_DIR}/@$MOD/userconfig/"* "${ARMA_DIR}/userconfig/$MOD/"
    else
      /bin/mkdir -p "${ARMA_DIR}/userconfig/$MOD"
      $CP "${ARMA_DIR}/@$MOD/userconfig/"* "${ARMA_DIR}/userconfig/$MOD/"
    fi
  else
    continue
  fi
  if test -e "${ARMA_DIR}/@$MOD/store/userconfig"
    then
    if test -e "${ARMA_DIR}/userconfig/$MOD"
      then
      $CP "${ARMA_DIR}/@$MOD/store/userconfig/"* "${ARMA_DIR}/userconfig/$MOD/"
    else
      /bin/mkdir -p "${ARMA_DIR}/userconfig/$MOD"
      $CP "${ARMA_DIR}/@$MOD/store/userconfig/"* "${ARMA_DIR}/userconfig/$MOD/"
    fi
  else
    continue
  fi
done
exit