#!/bin/bash
PROGNAME="Sganesha-start"
OPTSPEC="volname:,gd-workdir:"
VOL=
declare -i EXPORT_ID
ganesha_key="ganesha.enable"
GANESHA_DIR="/etc/ganesha"
CONF1="$GANESHA_DIR/ganesha.conf"
GLUSTERD_WORKDIR=

function parse_args ()
{
        ARGS=$(getopt -l $OPTSPEC  -o "o" -name $PROGNAME $@)
        eval set -- "$ARGS"

        while true; do
            case $1 in
                --volname)
                    shift
                    VOL=$1
                    ;;
                --gd-workdir)
                    shift
                    GLUSTERD_WORKDIR=$1
                    ;;
                *)
                    shift
                    break
                    ;;
            esac
            shift
        done
}



#This function generates a new export entry as export.volume_name.conf
function write_conf()
{
echo -e "# WARNING : Using Gluster CLI will overwrite manual
# changes made to this file. To avoid it, edit the
# file, copy it over to all the NFS-Ganesha nodes
# and run ganesha-ha.sh --refresh-config."

echo "EXPORT{"
echo "      Export_Id = 2;"
echo "      Path = \"/$VOL\";"
echo "      FSAL {"
echo "           name = \"GLUSTER\";"
echo "           hostname=\"localhost\";"
echo "           volume=\"$VOL\";"
echo "           }"
echo "      Access_type = RW;"
echo "      Disable_ACL = true;"
echo "      Squash=\"No_root_squash\";"
echo "      Pseudo=\"/$VOL\";"
echo "      Protocols = \"3\", \"4\" ;"
echo "      Transports = \"UDP\",\"TCP\";"
echo "      SecType = \"sys\";"
echo "}"
}

#This function keeps track of export IDs and increments it with every new entry
function export_add()
{
        count=`ls -l $GANESHA_DIR/exports/*.conf | wc -l`
        if [ "$count" = "1" ] ;
                then
                EXPORT_ID=2
        else
        #if [ -s /var/lib/ganesha/export_removed ];
        #               then
        #               EXPORT_ID=`head -1 /var/lib/ganesha/export_removed`
        #               sed -i -e "1d" /var/lib/ganesha/export_removed
        #               else

                 EXPORT_ID=`cat $GANESHA_DIR/.export_added`
                 EXPORT_ID=EXPORT_ID+1
        #fi
        fi
        echo $EXPORT_ID > $GANESHA_DIR/.export_added
        sed -i s/Export_Id.*/"Export_Id= $EXPORT_ID ;"/ \
$GANESHA_DIR/exports/export.$VOL.conf
        echo "%include \"$GANESHA_DIR/exports/export.$VOL.conf\"" >> $CONF1
}

#This function adds a new export dynamically by sending dbus signals
function dynamic_export_add()
{
        dbus-send --print-reply --system --dest=org.ganesha.nfsd \
/org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.AddExport \
string:$GANESHA_DIR/exports/export.$VOL.conf string:"EXPORT(Path=/$VOL)"

}

function start_ganesha()
{
        #Remove export entry from nfs-ganesha.conf
        sed -i /$VOL.conf/d  $CONF1
        #Create a new export entry
        export_add $VOL
        dynamic_export_add $VOL

}

        parse_args $@
        is_exported="no"
        if showmount -e localhost | cut -d "" -f1 | grep -q "/$VOL[[:space:]]"
        then
              is_exported="yes"
        fi
        ganesha_value=$(grep $ganesha_key  $GLUSTERD_WORKDIR/vols/$VOL/info |\
                        cut -d"=" -f2)
        if [ "$ganesha_value" = "on" -a "$is_exported" = "no" ]
        then
                if [ ! -e $GANESHA_DIR/exports/export.$VOL.conf ]
                then
                        write_conf $VOL > $GANESHA_DIR/exports/export.$VOL.conf
                fi
                start_ganesha $VOL
        else
                exit 0
        fi