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#! /bin/bash -x
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#
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# ST - 2012-07-04
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#
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# Delete the compute nodes for a configuration.
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#
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# Get the directory of the script.
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SCRIPT_PATH=`dirname $0`
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# Get the script name.
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SCRIPT_NAME=`basename $0`
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# Source the common configuration variables.
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. $SCRIPT_PATH/c-i-a-b.common
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#
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# Get the configurations
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#
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CONFIGURATIONS=`ls $SCRIPT_PATH/$CONST_CONFIGURATIONS_DIR`
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CONFIGURATIONS_STRING="{"
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echo $CONFIGURATIONS
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for i in $CONFIGURATIONS ; do
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  CONFIGURATIONS_STRING="$CONFIGURATIONS_STRING$i|"
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done
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#
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# Check command line arguments.
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#
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if [ "x$1" == "x" ]
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  then
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     echo
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     echo "Missing parameter. Aborting!"
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     echo
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     echo "Usage: $SCRIPT_NAME configuration"
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     echo
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     echo -e "	configuration: one of $CONFIGURATIONS_STRING\b}"
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     exit 1
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fi
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#
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# Does the configuration exist?
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#
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CONFIGURATION_FOUND=""
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CONFIGURATION=`echo $1 | tr [:upper:] [:lower:]`
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for i in $CONFIGURATIONS ; do
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    CURRENT_CONFIGURATION=`echo $i | tr [:upper:] [:lower:]`
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    if [ $CONFIGURATION == $CURRENT_CONFIGURATION ] ; then
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      CONFIGURATION_FOUND=$i
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    fi
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done
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if [ -z $CONFIGURATION_FOUND ] ; then
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  echo
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  echo
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  echo "The configuration \"$1\" does not exist".
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  echo -e "The configuration must be one of $CONFIGURATIONS_STRING\b}."
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  echo "Aborting!"
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  echo
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  echo
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  exit 1
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else
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  CONFIGURATION=$CONFIGURATION_FOUND
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fi
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#
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# Source the specific variables for the configuration.
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#
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. $SCRIPT_PATH/$CONST_CONFIGURATIONS_DIR/$CONFIGURATION/c-i-a-b.config.common
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#
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# Delete the compute nodes.
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#
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COMPUTE_NODE_INDEX=1
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while [ $COMPUTE_NODE_INDEX -le $COMPUTE_NODE_MAX_INDEX ] ; do
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#
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# Compute the host name.
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#
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  #
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  # Convert the number into a three caracters strings.
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  #
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  COMPUTE_NODE_INDEX_STRING=$COMPUTE_NODE_INDEX
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  while [ ${#COMPUTE_NODE_INDEX_STRING} -lt 3 ] ; do
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    COMPUTE_NODE_INDEX_STRING="0$COMPUTE_NODE_INDEX_STRING"
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  done
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  #
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  # Compute the host name.
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  #
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  CURRENT_HOST_NAME=${COMPUTE_NODE_NAME_PREFIX}${COMPUTE_NODE_INDEX_STRING}
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  #
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  # If the compute node is running, stop it.
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  #
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  IS_RUNNING=`xm list | grep $CURRENT_HOST_NAME`
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  if [ ! -z "$IS_RUNNING" ] ; then
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    xm shutdown $CURRENT_HOST_NAME
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    #
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    # And wait until it has sopped.
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    #
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    IS_RUNNING=""
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    while [ -z "$IS_RUNNING" ] ; do
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      IS_RUNNING=`xm list | grep $CURRENT_HOST_NAME`
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      sleep 1
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    done # End while
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  fi # End compute node is running.
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  #
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  # If necessary, delete the VM system disk.
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  #
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  COMPUTE_NODE_SYSTEM_DISK_DEVICE="${COMPUTE_NODE_MODEL_SYSTEM_VOLUME_GROUP_DEVICE}/${CURRENT_HOST_NAME}-${CONST_SYSTEM_DISK_POSTFIX}-clone"
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  if [ -e $COMPUTE_NODE_SYSTEM_DISK_DEVICE ] ; then
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    lvremove -f $COMPUTE_NODE_SYSTEM_DISK_DEVICE
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    if [ $? -ne 0 ] ; then
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      ciab_abort_message "Could not remove system disk for $CURRENT_HOST_NAME" 1
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    fi
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  fi
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  #
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  # If necessary, remove the swap volume for the compute node.
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  #
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  COMPUTE_NODE_SWAP_DISK_DEVICE="COMPUTE_NODE_SWAP_DISK_VOLUME_GROUP_DEVICE/${CURRENT_HOST_NAME}-${CONST_SWAP_DISK_POSTFIX}"
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  if [ -e $COMPUTE_NODE_SWAP_DISK_DEVICE ] ; then
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    lvremove -f $COMPUTE_NODE_SWAP_DISK_DEVICE
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    if [ $? -ne 0 ] ; then
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      ciab_abort_message "Could not remove swap disk for $CURRENT_HOST_NAME" 1
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    fi
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  fi
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  #
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  # Remove the Xen configuration file.
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  #
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  CURRENT_PATH=/etc/xen
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  rm -f $CONST_XEN_CONFIG_DIR/$CURRENT_HOST_NAME.cfg
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  #
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  COMPUTE_NODE_INDEX=$((COMPUTE_NODE_INDEX + 1))
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done
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exit 0