#!/bin/bash

#rbt
# Description in BREST-2936

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
source ${DRIVER_PATH}/../../datastore/libfs.sh

# -------- Get datastore arguments from OpenNebula core ------------

DRV_ACTION=$1
DS_ID=$2


XPATH="${DRIVER_PATH}/../../datastore/xpath.rb -b $DRV_ACTION"

unset i XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH     /DS_DRIVER_ACTION_DATA/DATASTORE_LOCATION)

unset i

BASE_PATH="${XPATH_ELEMENTS[i++]}/$2"

# ------------ Compute datastore usage -------------

LVM_VG_PREFIX="vg-one-"

MONITOR_SCRIPT=$(cat <<EOF
if [ ! -d $BASE_PATH ]; then
    mkdir -p $BASE_PATH
fi

if PATH=\$PATH:/sbin:/bin:/usr/sbin:/usr/bin which vgdisplay &> /dev/null; then
    LVM_SIZE=\$(sudo vgdisplay \
                    --separator : \
                    --units m \
                    -o vg_size,vg_free \
                    --nosuffix \
                    --noheadings \
                    -C \
                    ${LVM_VG_PREFIX}${DS_ID} 2>/dev/null)
fi

if [ -n "\$LVM_SIZE" ]; then
    LVM_TOTAL=\$(echo \$LVM_SIZE | cut -d: -f1 | sed 's/\..*//;s/^\s*//')
    LVM_FREE=\$(echo \$LVM_SIZE | cut -d: -f2 | sed 's/\..*//;s/^\s*//')
    LVM_USED=\$(( \$LVM_TOTAL - \$LVM_FREE ))

    TOTAL_MB=\${LVM_TOTAL:-"0"}
    FREE_MB=\${LVM_FREE:-"0"}
    USED_MB=\${LVM_USED:-"0"}
fi

if [ -z "\$USED_MB" -o -z "\$TOTAL_MB" -o -z "\$FREE_MB" ]; then
    msg="Empty value found"
    echo "\$msg: USED_MB=\$USED_MB, TOTAL_MB=\$TOTAL_MB, FREE_MB=\$FREE_MB"
    exit 1
fi

echo "USED_MB=\$USED_MB"
echo "FREE_MB=\$FREE_MB"
echo "TOTAL_MB=\$TOTAL_MB"

EOF
)

MONITOR_DATA="$(monitor_and_log "$MONITOR_SCRIPT" "Monitor script" 2>&1)"

MONITOR_STATUS=$?

if [ "$MONITOR_STATUS" = "0" ]; then
    echo "$MONITOR_DATA"
    exit 0
else
    echo "$MONITOR_DATA"
    exit $MONITOR_STATUS
fi
