#! /bin/bash
#*******************************************************************************
# ALMA Project
#
# "@(#) $Id: acsUpdate,v 1.4 2006/03/15 09:55:35 gchiozzi Exp $"
#
# who       when      what
# --------  --------  ----------------------------------------------
# gchiozzi  2005-03-21 created
#

#************************************************************************
#   NAME 
#   acsUpdate - Updates a standard ACS installation
#
#   SYNOPSIS
#   acsUpdate [OPTIONS]  tar_file_name
# 
#   DESCRIPTION
#   Updates a standard ACS installation
#   It assumes that another version of ACS
#   is already installed in $ALMASW_INSTDIR
#   and that the environment is properly configured
#
#   The already existing ACS installation is
#   backed up by making a copy of the directoryes
#   ACSSW and acsdata using, if possible their
#   version number or tag as inferred from the version files.
#   If such directories already esist, the PID is 
#   appended to generate unique directory names.
#
#   In order to use the older version "in parallel"
#   to the new version, it is sufficient to
#   set in the login script ACSROOT and ACSDATA
#   environment variables to the names of the backed up
#   directories.
#   This allows to keep multiple patches/minor versions
#   of ACS in the same installation
#
#   FILES
#   The file name of the tar file given as last argument
#   and containing the new ACS binary distribution
#
#   ENVIRONMENT
#   The following environment variables are used and assumed to
#   be properly set:
#      ALMASW_INSTDIR
#      ALMASW_RELEASE
#   The following environment variables are checked
#   for consistency with ALMASW_INSTDIR and eventually
#   overwritten:
#      ACSROOT    (must be $ALMASW_INSTDIR/ACSSW)
#      ACSDATA    (must be $ALMASW_INSTDIR/acsdata)
#
#   RETURN VALUES
#   0 - if everything OK
#   2 - in case of errors
# 
#   CAUTIONS
#
#   EXAMPLES
#
#   SEE ALSO
#
#   BUGS     
#
#------------------------------------------------------------------------
#

#
# which platform?
#
build_OS=`uname -s`

echo "====== ALMA Common Software update script ======"

CWD=`pwd`

date
echo ""

#################################
# command line options handling #
#################################

#
# These options can be recognized (longopts comma-separated. colon means argument is required)
# LONGOPTS=help,managerReference:,DALReference:
# SHORTOPTS=hm:d:b:e:
#
LONGOPTS=help,check
SHORTOPTS=hc

THIS=`basename $0`
CL_HELP=
CL_ACTION="update"

#
# Usage info. Be nice and keep this up-to-date!
#
function printUsage {
   echo "Updates a standard ACS installation"
   echo "It assumes that another version of ACS"
   echo "is already installed in ALMASW_INSTDIR"
   echo "and that the environment is properly configured"
   echo "Usage: $THIS [OPTIONS]  tar_file_name"
   echo "Options: "
   echo "   -c | -check                  only checks configuration and exits"
   echo "   -h | -help                   prints this help and exits"
   echo ""
}

#
# Run getopt (posixly_correct needed). We run twice:
# First run is simply to check the commandline for correctness
# Second run is the real deal which replaces the command line args with getopt's output
export POSIXLY_CORRECT=1

getopt -n $THIS -Q -u -a -l $LONGOPTS $SHORTOPTS "$@" || {
   printUsage
   exit 43;
}

set -- `getopt -u -a -l $LONGOPTS $SHORTOPTS "$@"`


#
# Iterate over getopt's output and set CL_XXX variables accordingly
#
while : 
do
	case "$1" in
	-c)                 CL_ACTION=check ;;
	--check)            CL_ACTION=check ;;
	-h)                 CL_HELP=true ;; 
	--help)             CL_HELP=true ;; 
	--) break ;;
	esac
	shift
done
shift

if [ "$CL_HELP" ] ; then
   printUsage
   exit 0
fi

## end cmd line parsing ###############################

#
# Get the name of the ACS tar file from the
# last argument in the command line and makes its path
# absolute
#
ACS_TAR_FILE=$1
case "$ACS_TAR_FILE" in
/*) ;;
*)  ACS_TAR_FILE=$PWD/$ACS_TAR_FILE
    ;;
esac

if [ ! -e $ACS_TAR_FILE ]
then
  echo Error: ACS tar file $ACS_TAR_FILE is missing
  exit 2
fi

if [ -d $ACS_TAR_FILE ]
then
  echo Error: $ACS_TAR_FILE is a directory
  exit 2
fi

echo "Using ACS tar file $ACS_TAR_FILE"

if [ ! -d $ALMASW_INSTDIR ]
then
  echo "ALMA SW installation directory does not exist!"
  exit 2
fi

#
# Checks consistency of ACSROOT and ACSDATA
# If not standard, overwrite with standard value
#
if [ $ACSROOT != $ALMASW_INSTDIR/ACSSW ]
then
   echo ACSROOT=$ACSROOT is not standard. Overwriting
   ACSROOT=$ALMASW_INSTDIR/ACSSW
fi
if [ $ACSDATA != $ALMASW_INSTDIR/acsdata ]
then
   echo ACSDATA=$ACSDATA is not standard. Overwriting
   ACSDATA=$ALMASW_INSTDIR/acsdata
fi

#
# Checks current installation
# 
echo "==== Checking current installation"
if [ -e $ACSROOT/ACS_VERSION ]
then
   ACS_VERSION_NOW=`cat $ACSROOT/ACS_VERSION`
else
   ACS_VERSION_NOW="UNKNOWN"
fi

if [ -e $ACSROOT/ACS_PATCH_LEVEL ]
then
   ACS_PATCH_LEVEL_NOW=`cat $ACSROOT/ACS_PATCH_LEVEL`
else
   ACS_PATCH_LEVEL_NOW="UNKNOWN"
fi

echo "ACS version: $ACS_VERSION_NOW.$ACS_PATCH_LEVEL_NOW"

if [ -e $ACSROOT/ACS_TAG ]
then
   ACS_TAG_NOW=`cat $ACSROOT/ACS_TAG`
   case "$ACS_TAG_NOW" in
     WARNING*) ACS_TAG_NOW="UNKNOWN";;
   esac
else
   ACS_TAG_NOW="UNKNOWN"
fi

echo "ACS tag    : $ACS_TAG_NOW"
 
#
# Checks the version coming with the given tar file
# 
echo "==== Checking version in tar file: $ACS_TAR_FILE"
echo "     Retrieving the version information may take some time!"
ACS_VERSION_NEW=`gtar -xOzf $ACS_TAR_FILE alma/$ALMASW_RELEASE/ACSSW/ACS_VERSION`
if [ $? != 0 ] 
then
  echo "Invalid ACS distribution (no ACS_VERSION). Abort"
  exit 2
fi

ACS_PATCH_LEVEL_NEW=`gtar -xOzf $ACS_TAR_FILE alma/$ALMASW_RELEASE/ACSSW/ACS_PATCH_LEVEL`
if [ $? != 0 ] 
then
  echo "Invalid ACS distribution (no ACS_PATCH_LEVEL). Abort"
  exit 2
fi

ACS_TAG_NEW=`gtar -xOzf $ACS_TAR_FILE alma/$ALMASW_RELEASE/ACSSW/ACS_TAG 2>/dev/null`
if [ $? != 0 ] 
then
  echo "ACS_TAG file not found in archive. This is not a tagged distribution."
  ACS_TAG_NEW="UNKNOWN"
fi

#
# Print out version and tag in tar file
# 
echo "ACS version: $ACS_VERSION_NEW.$ACS_PATCH_LEVEL_NEW"
echo "ACS tag    : $ACS_TAG_NEW"

#
# Finds the proper name for the backup directory
#
if [ "$CL_ACTION" = "update" ] ; then

   echo "==== Create backup of current ACSROOT and ACSDATA"
   ACSROOT_BACKUP=$ACSROOT.$ACS_VERSION_NOW.$ACS_PATCH_LEVEL_NOW
   ACSDATA_BACKUP=$ACSDATA.$ACS_VERSION_NOW.$ACS_PATCH_LEVEL_NOW

   if [ -e $ACSROOT_BACKUP ]
	then
	echo $ACSROOT_BACKUP already exists
	if [ "$ACS_TAG_NOW" != "UNKNOWN" ]
	    then
	    ACSROOT_BACKUP=$ACSROOT.$ACS_TAG_NOW
	    ACSDATA_BACKUP=$ACSDATA.$ACS_TAG_NOW
	fi
	if [ -e $ACSROOT_BACKUP ]
	    then
	    echo $ACSROOT_BACKUP already exists
	    ACSROOT_BACKUP=$ACSROOT.$$
	    ACSDATA_BACKUP=$ACSDATA.$$
	fi
   fi

   echo "ACSROOT will be backed up in: $ACSROOT_BACKUP"
   echo "ACSDATA will be backed up in: $ACSDATA_BACKUP"

   mv $ACSROOT $ACSROOT_BACKUP
   if [ $? != 0 ] 
   then
     echo "Cannot backup $ACSROOT. Abort"
     exit 2
   fi
   mv $ACSDATA $ACSDATA_BACKUP
   if [ $? != 0 ] 
   then
     echo "Cannot backup $ACSDATA. Abort"
     exit 2
   fi

   #
   # Go to the base directory for the installation
   #
   CWD=`pwd`
   cd $ALMASW_INSTDIR
   cd ../..
   
   #
   # As last, unpacks
   #
   echo "==== Unpack the $ACS_TAR_FILE distribution"
   gtar zpxf $ACS_TAR_FILE alma/$ALMASW_RELEASE/ACSSW alma/$ALMASW_RELEASE/acsdata
   if [ $? != 0 ] 
   then
     echo "Error unpacking $ACS_TAR_FILE. Abort"
     exit 2
   fi
fi

echo ""
date
echo "==== ACS $CL_ACTION done! ===="

#
# ___oOo___