#!/bin/bash
# $Id: mac_inst_pkg.sh 1299 2008-05-12 14:55:08Z admin $


BASEURL=$1
VERSION=$2
PKGNAME=$3
CHKSUM=$4
EXTENSION=$5
REMOVE=$6
CHECKONLY=$7

# this is the naming scheme of the packages:
PKGNS="${PKGNAME}_${VERSION}.${EXTENSION}"

# ZIPFILE
ZIPFILE="${PKGNS}.zip"

# ------------------------------ Functions  ----------------------------

function is_installed_with_any_version {
   if [ "`ls \"/Library/Receipts/${PGKNS}\"* 2>/dev/null`" != "" ] ; then
     return 1 
   fi

   return 0
}

function is_installed_with_req_version {
   ## echo "Testing whether /Library/Receipts/${PKGNS} exists"
   if [ -e "/Library/Receipts/${PKGNS}" ] ; then
     return 1 
   fi

   return 0
}

function remove_old {
	echo "Removing old not yet implemented!"
}

# ------------------------------ Installed? ---------------------------

is_installed_with_req_version
if [ $? -eq 1 ] ; then 
  echo "Required Version of ${PKGNAME} (${PKGNS}) already installed --> Done."
  exit 1; 
fi
if [ "$CHECKONLY" != "" ] ; then
  exit 0;
fi

is_installed_with_any_version
if [ $? -eq 1 ] ; then 
  echo "Other Version of ${PKGNAME} already installed --> Updating."
  if [ "$REMOVE" == "true" ] ; then
  	remove_old
  fi 
else
  echo "No Version of ${PKGNAME} already installed --> Installing."
fi

# ------------------------------ Download ----------------------------
cd /tmp
ZIPFILE=`echo $ZIPFILE | perl -npe 's/ /%20/g'`
curl "${BASEURL}/$ZIPFILE" -o "/tmp/$ZIPFILE"

# ------------------------------ Checksum ----------------------------
if [ -e "/sw/bin/md5sum" ] ; then
	DLMD5=`/sw/bin/md5sum "$ZIPFILE" | cut -f1 -d' '`
else
	DLMD5=`md5 "$ZIPFILE" | cut -f4 -d' '`
fi

if [ "0" != "$CHKSUM" ] ; then
	if [ "$DLMD5" != "$CHKSUM" ] ; then
	   echo "Could not verify checksum: Mismatch!"
	   exit 1
	fi
else
	echo "WARNING: Ignoring checksum check"
fi

# ------------------------------ Install  ----------------------------
# -o: force overwrite
unzip -o "$ZIPFILE"
if installer -pkg  "${PKGNS}" -target / ; then
  touch "/Library/Receipts/${PKGNS}"
  exit 0
fi

echo "Installer failed."
exit 1