#!/bin/bash

# Copyright 2015-2016 Red Hat Inc.  All Rights Reserved
#
# Pacemaker+Corosync High Availability for NFS-Ganesha
#
# setup, teardown, add, delete, refresh-config, and status
#
# Each participating node in the cluster is assigned a virtual IP (VIP)
# which fails over to another node when its associated ganesha.nfsd dies
# for any reason. After the VIP is moved to another node all the
# ganesha.nfsds are send a signal using DBUS to put them into NFS GRACE.
#
# There are six resource agent types used: ganesha_mon, ganesha_grace,
# ganesha_nfsd, IPaddr, and Dummy. ganesha_mon is used to monitor the
# ganesha.nfsd. ganesha_grace is used to send the DBUS signal to put
# the remaining ganesha.nfsds into grace. ganesha_nfsd is used to start
# and stop the ganesha.nfsd during setup and teardown. IPaddr manages
# the VIP. A Dummy resource named $hostname-trigger_ip-1 is used to
# ensure that the NFS GRACE DBUS signal is sent after the VIP moves to
# the new host.

GANESHA_HA_SH=$(realpath $0)
HA_NUM_SERVERS=0
HA_SERVERS=""
HA_VOL_NAME="gluster_shared_storage"
HA_VOL_MNT="/var/run/gluster/shared_storage"
HA_CONFDIR=$HA_VOL_MNT"/nfs-ganesha"
SERVICE_MAN="DISTRO_NOT_FOUND"

RHEL6_PCS_CNAME_OPTION="--name"
SECRET_PEM="/var/lib/glusterd/nfs/secret.pem"

# UNBLOCK RA uses shared_storage which may become unavailable
# during any of the nodes reboot. Hence increase timeout value.
PORTBLOCK_UNBLOCK_TIMEOUT="60s"

# Try loading the config from any of the distro
# specific configuration locations
if [ -f /etc/sysconfig/ganesha ]
        then
        . /etc/sysconfig/ganesha
fi
if [ -f /etc/conf.d/ganesha ]
        then
        . /etc/conf.d/ganesha
fi
if [ -f /etc/default/ganesha ]
        then
        . /etc/default/ganesha
fi

GANESHA_CONF=

function find_rhel7_conf
{
 while [[ $# > 0 ]]
        do
                key="$1"
                case $key in
                        -f)
                         CONFFILE="$2"
                         break;
                         ;;
                         *)
                         ;;
                 esac
                 shift
         done
}

if [ -z ${CONFFILE} ]
        then
        find_rhel7_conf ${OPTIONS}

fi

GANESHA_CONF=${CONFFILE:-/etc/ganesha/ganesha.conf}

usage() {

        echo "Usage      : add|delete|refresh-config|status"
        echo "Add-node   : ganesha-ha.sh --add <HA_CONF_DIR> \
<NODE-HOSTNAME>  <NODE-VIP>"
        echo "Delete-node: ganesha-ha.sh --delete <HA_CONF_DIR> \
<NODE-HOSTNAME>"
        echo "Refresh-config : ganesha-ha.sh --refresh-config <HA_CONFDIR> \
<volume>"
        echo "Status : ganesha-ha.sh --status <HA_CONFDIR>"
}

determine_service_manager () {

        if [ -e "/bin/systemctl" ];
        then
                SERVICE_MAN="/bin/systemctl"
        elif [ -e "/sbin/invoke-rc.d" ];
        then
                SERVICE_MAN="/sbin/invoke-rc.d"
        elif [ -e "/sbin/service" ];
        then
                SERVICE_MAN="/sbin/service"
        fi
        if [ "${SERVICE_MAN}" == "DISTRO_NOT_FOUND" ]
        then
                echo "Service manager not recognized, exiting"
                exit 1
        fi
}

manage_service ()
{
        local action=${1}
        local new_node=${2}
        local option=

        if [ "${action}" == "start" ]; then
                option="yes"
        else
                option="no"
        fi
        ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i \
${SECRET_PEM} root@${new_node} "${GANESHA_HA_SH} --setup-ganesha-conf-files $HA_CONFDIR $option"

        if [ "${SERVICE_MAN}" == "/bin/systemctl" ]
        then
                ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i \
${SECRET_PEM} root@${new_node} "${SERVICE_MAN}  ${action} nfs-ganesha"
        else
                ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i \
${SECRET_PEM} root@${new_node} "${SERVICE_MAN} nfs-ganesha ${action}"
        fi
}


check_cluster_exists()
{
    local name=${1}
    local cluster_name=""

    if [ -e /var/run/corosync.pid ]; then
        cluster_name=$(pcs status | grep "Cluster name:" | cut -d ' ' -f 3)
        if [ ${cluster_name} -a ${cluster_name} = ${name} ]; then
            logger "$name already exists, exiting"
            exit 0
        fi
    fi
}


determine_servers()
{
    local cmd=${1}
    local num_servers=0
    local tmp_ifs=${IFS}
    local ha_servers=""

    if [ "X${cmd}X" != "XsetupX" -a "X${cmd}X" != "XstatusX" ]; then
        ha_servers=$(pcs status | grep "Online:" | grep -o '\[.*\]' | sed -e 's/\[//' | sed -e 's/\]//')
        IFS=$' '
        for server in ${ha_servers} ; do
            num_servers=$(expr ${num_servers} + 1)
        done
        IFS=${tmp_ifs}
        HA_NUM_SERVERS=${num_servers}
        HA_SERVERS="${ha_servers}"
    else
        IFS=$','
        for server in ${HA_CLUSTER_NODES} ; do
            num_servers=$(expr ${num_servers} + 1)
        done
        IFS=${tmp_ifs}
        HA_NUM_SERVERS=${num_servers}
        HA_SERVERS="${HA_CLUSTER_NODES//,/ }"
    fi
}

stop_ganesha_all()
{
    local serverlist=${1}
    for node in ${serverlist} ; do
        manage_service "stop" ${node}
    done
}

setup_cluster()
{
    local name=${1}
    local num_servers=${2}
    local servers=${3}
    local unclean=""
    local quorum_policy="stop"

    logger "setting up cluster ${name} with the following ${servers}"

    pcs cluster auth ${servers}
    # pcs cluster setup --name ${name} ${servers}
    pcs cluster setup ${RHEL6_PCS_CNAME_OPTION} ${name} --enable --transport udpu ${servers}
    if [ $? -ne 0 ]; then
        logger "pcs cluster setup ${RHEL6_PCS_CNAME_OPTION} ${name} --enable --transport udpu ${servers} failed"
        #set up failed stop all ganesha process and clean up symlinks in cluster
        stop_ganesha_all "${servers}"
        exit 1;
    fi
    pcs cluster start --all
    if [ $? -ne 0 ]; then
        logger "pcs cluster start failed"
        exit 1;
    fi

    sleep 1
    # wait for the cluster to elect a DC before querying or writing
    # to the CIB. BZ 1334092
    crmadmin --dc_lookup --timeout=5000 > /dev/null 2>&1
    while [ $? -ne 0 ]; do
        crmadmin --dc_lookup --timeout=5000 > /dev/null 2>&1
    done

    unclean=$(pcs status | grep -u "UNCLEAN")
    while [[ "${unclean}X" = "UNCLEANX" ]]; do
         sleep 1
         unclean=$(pcs status | grep -u "UNCLEAN")
    done
    sleep 1

    if [ ${num_servers} -lt 3 ]; then
        quorum_policy="ignore"
    fi
    pcs property set no-quorum-policy=${quorum_policy}
    if [ $? -ne 0 ]; then
        logger "warning: pcs property set no-quorum-policy=${quorum_policy} failed"
    fi

    pcs property set stonith-enabled=false
    if [ $? -ne 0 ]; then
        logger "warning: pcs property set stonith-enabled=false failed"
    fi
}


setup_finalize_ha()
{
    local cibfile=${1}
    local stopped=""

    stopped=$(pcs status | grep -u "Stopped")
    while [[ "${stopped}X" = "StoppedX" ]]; do
         sleep 1
         stopped=$(pcs status | grep -u "Stopped")
    done
}


refresh_config ()
{
        local short_host=$(hostname -s)
        local VOL=${1}
        local HA_CONFDIR=${2}
        local short_host=$(hostname -s)

        local export_id=$(grep ^[[:space:]]*Export_Id $HA_CONFDIR/exports/export.$VOL.conf |\
                          awk -F"[=,;]" '{print $2}' | tr -d '[[:space:]]')


        if [ -e ${SECRET_PEM} ]; then
        while [[ ${3} ]]; do
            current_host=`echo ${3} | cut -d "." -f 1`
            if [ ${short_host} != ${current_host} ]; then
                output=$(ssh -oPasswordAuthentication=no \
-oStrictHostKeyChecking=no -i ${SECRET_PEM} root@${current_host} \
"dbus-send --print-reply --system --dest=org.ganesha.nfsd \
/org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.UpdateExport \
string:$HA_CONFDIR/exports/export.$VOL.conf \
string:\"EXPORT(Export_Id=$export_id)\" 2>&1")
                ret=$?
                logger <<< "${output}"
                if [ ${ret} -ne 0 ]; then
                        echo "Refresh-config failed on ${current_host}. Please check logs on ${current_host}"
                else
                        echo "Refresh-config completed on ${current_host}."
                fi

          fi
          shift
        done
    else
        echo "Error: refresh-config failed. Passwordless ssh is not enabled."
        exit 1
    fi

    # Run the same command on the localhost,
        output=$(dbus-send --print-reply --system --dest=org.ganesha.nfsd \
/org/ganesha/nfsd/ExportMgr org.ganesha.nfsd.exportmgr.UpdateExport \
string:$HA_CONFDIR/exports/export.$VOL.conf \
string:"EXPORT(Export_Id=$export_id)" 2>&1)
        ret=$?
        logger <<< "${output}"
        if [ ${ret} -ne 0 ] ; then
                echo "Refresh-config failed on localhost."
        else
                echo "Success: refresh-config completed."
        fi
}


teardown_cluster()
{
    local name=${1}

    for server in ${HA_SERVERS} ; do
        if [[ ${HA_CLUSTER_NODES} != *${server}* ]]; then
            logger "info: ${server} is not in config, removing"

            pcs cluster stop ${server} --force
            if [ $? -ne 0 ]; then
                logger "warning: pcs cluster stop ${server} failed"
            fi

            pcs cluster node remove ${server}
            if [ $? -ne 0 ]; then
                logger "warning: pcs cluster node remove ${server} failed"
            fi
        fi
    done

    # BZ 1193433 - pcs doesn't reload cluster.conf after modification
    # after teardown completes, a subsequent setup will appear to have
    # 'remembered' the deleted node. You can work around this by
    # issuing another `pcs cluster node remove $node`,
    # `crm_node -f -R $server`, or
    # `cibadmin --delete --xml-text '<node id="$server"
    # uname="$server"/>'

    pcs cluster stop --all
    if [ $? -ne 0 ]; then
        logger "warning pcs cluster stop --all failed"
    fi

    pcs cluster destroy
    if [ $? -ne 0 ]; then
        logger "error pcs cluster destroy failed"
        exit 1
    fi
}


cleanup_ganesha_config ()
{
    rm -f /etc/corosync/corosync.conf
    rm -rf /etc/cluster/cluster.conf*
    rm -rf /var/lib/pacemaker/cib/*
    sed -r -i -e '/^%include[[:space:]]+".+\.conf"$/d'  $HA_CONFDIR/ganesha.conf
}

do_create_virt_ip_constraints()
{
    local cibfile=${1}; shift
    local primary=${1}; shift
    local weight="1000"

    # first a constraint location rule that says the VIP must be where
    # there's a ganesha.nfsd running
    pcs -f ${cibfile} constraint location ${primary}-group rule score=-INFINITY ganesha-active ne 1
    if [ $? -ne 0 ]; then
        logger "warning: pcs constraint location ${primary}-group rule score=-INFINITY ganesha-active ne 1 failed"
    fi

    # then a set of constraint location prefers to set the prefered order
    # for where a VIP should move
    while [[ ${1} ]]; do
        pcs -f ${cibfile} constraint location ${primary}-group prefers ${1}=${weight}
        if [ $? -ne 0 ]; then
            logger "warning: pcs constraint location ${primary}-group prefers ${1}=${weight} failed"
        fi
        weight=$(expr ${weight} + 1000)
        shift
    done
    # and finally set the highest preference for the VIP to its home node
    # default weight when created is/was 100.
    # on Fedora setting appears to be additive, so to get the desired
    # value we adjust the weight
    # weight=$(expr ${weight} - 100)
    pcs -f ${cibfile} constraint location ${primary}-group prefers ${primary}=${weight}
    if [ $? -ne 0 ]; then
        logger "warning: pcs constraint location ${primary}-group prefers ${primary}=${weight} failed"
    fi
}


wrap_create_virt_ip_constraints()
{
    local cibfile=${1}; shift
    local primary=${1}; shift
    local head=""
    local tail=""

    # build a list of peers, e.g. for a four node cluster, for node1,
    # the result is "node2 node3 node4"; for node2, "node3 node4 node1"
    # and so on.
    while [[ ${1} ]]; do
        if [ "${1}" = "${primary}" ]; then
            shift
            while [[ ${1} ]]; do
                tail=${tail}" "${1}
                shift
            done
        else
            head=${head}" "${1}
        fi
        shift
    done
    do_create_virt_ip_constraints ${cibfile} ${primary} ${tail} ${head}
}


create_virt_ip_constraints()
{
    local cibfile=${1}; shift

    while [[ ${1} ]]; do
        wrap_create_virt_ip_constraints ${cibfile} ${1} ${HA_SERVERS}
        shift
    done
}


setup_create_resources()
{
    local cibfile=$(mktemp -u)

    # fixup /var/lib/nfs
    logger "pcs resource create nfs_setup ocf:heartbeat:ganesha_nfsd ha_vol_mnt=${HA_VOL_MNT} --clone"
    pcs resource create nfs_setup ocf:heartbeat:ganesha_nfsd ha_vol_mnt=${HA_VOL_MNT} --clone
    if [ $? -ne 0 ]; then
        logger "warning: pcs resource create nfs_setup ocf:heartbeat:ganesha_nfsd ha_vol_mnt=${HA_VOL_MNT} --clone failed"
    fi

    pcs resource create nfs-mon ocf:heartbeat:ganesha_mon --clone
    if [ $? -ne 0 ]; then
        logger "warning: pcs resource create nfs-mon ocf:heartbeat:ganesha_mon --clone failed"
    fi

    # see comment in (/usr/lib/ocf/resource.d/heartbeat/ganesha_grace
    # start method. Allow time for ganesha_mon to start and set the
    # ganesha-active crm_attribute
    sleep 5

    pcs resource create nfs-grace ocf:heartbeat:ganesha_grace --clone notify=true
    if [ $? -ne 0 ]; then
        logger "warning: pcs resource create nfs-grace ocf:heartbeat:ganesha_grace --clone failed"
    fi

    pcs constraint location nfs-grace-clone rule score=-INFINITY grace-active ne 1
    if [ $? -ne 0 ]; then
        logger "warning: pcs constraint location nfs-grace-clone rule score=-INFINITY grace-active ne 1"
    fi

    pcs cluster cib ${cibfile}

    while [[ ${1} ]]; do

        # this is variable indirection
        # from a nvs like 'VIP_host1=10.7.6.5' or 'VIP_host1="10.7.6.5"'
        # (or VIP_host-1=..., or VIP_host-1.my.domain.name=...)
        # a variable 'clean_name' is created (e.g. w/ value 'VIP_host_1')
        # and a clean nvs (e.g. w/ value 'VIP_host_1="10_7_6_5"')
        # after the `eval ${clean_nvs}` there is a variable VIP_host_1
        # with the value '10_7_6_5', and the following \$$ magic to
        # reference it, i.e. `eval tmp_ipaddr=\$${clean_name}` gives us
        # ${tmp_ipaddr} with 10_7_6_5 and then convert the _s back to .s
        # to give us ipaddr="10.7.6.5". whew!
        name="VIP_${1}"
        clean_name=${name//[-.]/_}
        nvs=$(grep "^${name}=" ${HA_CONFDIR}/ganesha-ha.conf)
        clean_nvs=${nvs//[-.]/_}
        eval ${clean_nvs}
        eval tmp_ipaddr=\$${clean_name}
        ipaddr=${tmp_ipaddr//_/.}

        pcs -f ${cibfile} resource create ${1}-nfs_block ocf:heartbeat:portblock protocol=tcp \
        portno=2049 action=block ip=${ipaddr} --group ${1}-group
        if [ $? -ne 0 ]; then
            logger "warning pcs resource create ${1}-nfs_block failed"
        fi
        pcs -f ${cibfile} resource create ${1}-cluster_ip-1 ocf:heartbeat:IPaddr ip=${ipaddr} \
        cidr_netmask=32 op monitor interval=15s --group ${1}-group --after ${1}-nfs_block
        if [ $? -ne 0 ]; then
            logger "warning pcs resource create ${1}-cluster_ip-1 ocf:heartbeat:IPaddr ip=${ipaddr} \
            cidr_netmask=32 op monitor interval=15s failed"
        fi

        pcs -f ${cibfile} constraint order nfs-grace-clone then ${1}-cluster_ip-1
        if [ $? -ne 0 ]; then
            logger "warning: pcs constraint order nfs-grace-clone then ${1}-cluster_ip-1 failed"
        fi

        pcs -f ${cibfile} resource create ${1}-nfs_unblock ocf:heartbeat:portblock protocol=tcp \
        portno=2049 action=unblock ip=${ipaddr} reset_local_on_unblock_stop=true \
        tickle_dir=${HA_VOL_MNT}/nfs-ganesha/tickle_dir/ --group ${1}-group --after ${1}-cluster_ip-1 \
        op stop timeout=${PORTBLOCK_UNBLOCK_TIMEOUT} op start timeout=${PORTBLOCK_UNBLOCK_TIMEOUT} \
        op monitor interval=10s timeout=${PORTBLOCK_UNBLOCK_TIMEOUT}
        if [ $? -ne 0 ]; then
            logger "warning pcs resource create ${1}-nfs_unblock failed"
        fi


        shift
    done

    create_virt_ip_constraints ${cibfile} ${HA_SERVERS}

    pcs cluster cib-push ${cibfile}
    if [ $? -ne 0 ]; then
        logger "warning pcs cluster cib-push ${cibfile} failed"
    fi
    rm -f ${cibfile}
}


teardown_resources()
{
    # local mntpt=$(grep ha-vol-mnt ${HA_CONFIG_FILE} | cut -d = -f 2)

    # restore /var/lib/nfs
    logger "notice: pcs resource delete nfs_setup-clone"
    pcs resource delete nfs_setup-clone
    if [ $? -ne 0 ]; then
        logger "warning: pcs resource delete nfs_setup-clone failed"
    fi

    # delete -clone resource agents
    # in particular delete the ganesha monitor so we don't try to
    # trigger anything when we shut down ganesha next.
    pcs resource delete nfs-mon-clone
    if [ $? -ne 0 ]; then
        logger "warning: pcs resource delete nfs-mon-clone failed"
    fi

    pcs resource delete nfs-grace-clone
    if [ $? -ne 0 ]; then
        logger "warning: pcs resource delete nfs-grace-clone failed"
    fi

    while [[ ${1} ]]; do
        pcs resource delete ${1}-group
        if [ $? -ne 0 ]; then
            logger "warning: pcs resource delete ${1}-group failed"
        fi
        shift
    done

}


recreate_resources()
{
    local cibfile=${1}; shift

    while [[ ${1} ]]; do
        # this is variable indirection
        # see the comment on the same a few lines up
        name="VIP_${1}"
        clean_name=${name//[-.]/_}
        nvs=$(grep "^${name}=" ${HA_CONFDIR}/ganesha-ha.conf)
        clean_nvs=${nvs//[-.]/_}
        eval ${clean_nvs}
        eval tmp_ipaddr=\$${clean_name}
        ipaddr=${tmp_ipaddr//_/.}

        pcs -f ${cibfile} resource create ${1}-nfs_block ocf:heartbeat:portblock protocol=tcp \
        portno=2049 action=block ip=${ipaddr} --group ${1}-group
        if [ $? -ne 0 ]; then
            logger "warning pcs resource create ${1}-nfs_block failed"
        fi
        pcs -f ${cibfile} resource create ${1}-cluster_ip-1 ocf:heartbeat:IPaddr ip=${ipaddr} \
        cidr_netmask=32 op monitor interval=15s --group ${1}-group --after ${1}-nfs_block
        if [ $? -ne 0 ]; then
            logger "warning pcs resource create ${1}-cluster_ip-1 ocf:heartbeat:IPaddr ip=${ipaddr} \
            cidr_netmask=32 op monitor interval=15s failed"
        fi

        pcs -f ${cibfile} constraint order nfs-grace-clone then ${1}-cluster_ip-1
        if [ $? -ne 0 ]; then
            logger "warning: pcs constraint order nfs-grace-clone then ${1}-cluster_ip-1 failed"
        fi

        pcs -f ${cibfile} resource create ${1}-nfs_unblock ocf:heartbeat:portblock protocol=tcp \
        portno=2049 action=unblock ip=${ipaddr} reset_local_on_unblock_stop=true \
        tickle_dir=${HA_VOL_MNT}/nfs-ganesha/tickle_dir/ --group ${1}-group --after ${1}-cluster_ip-1 \
        op stop timeout=${PORTBLOCK_UNBLOCK_TIMEOUT} op start timeout=${PORTBLOCK_UNBLOCK_TIMEOUT} \
        op monitor interval=10s timeout=${PORTBLOCK_UNBLOCK_TIMEOUT}
        if [ $? -ne 0 ]; then
            logger "warning pcs resource create ${1}-nfs_unblock failed"
        fi

        shift
    done
}


addnode_recreate_resources()
{
    local cibfile=${1}; shift
    local add_node=${1}; shift
    local add_vip=${1}; shift

    recreate_resources ${cibfile} ${HA_SERVERS}

    pcs -f ${cibfile} resource create ${add_node}-nfs_block ocf:heartbeat:portblock \
    protocol=tcp portno=2049 action=block ip=${add_vip} --group ${add_node}-group
    if [ $? -ne 0 ]; then
        logger "warning pcs resource create ${add_node}-nfs_block failed"
    fi
    pcs -f ${cibfile} resource create ${add_node}-cluster_ip-1 ocf:heartbeat:IPaddr \
    ip=${add_vip} cidr_netmask=32 op monitor interval=15s --group ${add_node}-group \
    --after ${add_node}-nfs_block
    if [ $? -ne 0 ]; then
        logger "warning pcs resource create ${add_node}-cluster_ip-1 ocf:heartbeat:IPaddr \
	ip=${add_vip} cidr_netmask=32 op monitor interval=15s failed"
    fi

    pcs -f ${cibfile} constraint order nfs-grace-clone then ${add_node}-cluster_ip-1
    if [ $? -ne 0 ]; then
        logger "warning: pcs constraint order nfs-grace-clone then ${add_node}-cluster_ip-1 failed"
    fi
    pcs -f ${cibfile} resource create ${add_node}-nfs_unblock ocf:heartbeat:portblock \
    protocol=tcp portno=2049 action=unblock ip=${add_vip} reset_local_on_unblock_stop=true \
    tickle_dir=${HA_VOL_MNT}/nfs-ganesha/tickle_dir/ --group ${add_node}-group --after \
    ${add_node}-cluster_ip-1 op stop timeout=${PORTBLOCK_UNBLOCK_TIMEOUT} op start \
    timeout=${PORTBLOCK_UNBLOCK_TIMEOUT} op monitor interval=10s \
    timeout=${PORTBLOCK_UNBLOCK_TIMEOUT}
    if [ $? -ne 0 ]; then
        logger "warning pcs resource create ${add_node}-nfs_unblock failed"
    fi
}


clear_resources()
{
    local cibfile=${1}; shift

    while [[ ${1} ]]; do
        pcs -f ${cibfile} resource delete ${1}-group
        if [ $? -ne 0 ]; then
            logger "warning: pcs -f ${cibfile} resource delete ${1}-group"
        fi

        shift
    done
}


addnode_create_resources()
{
    local add_node=${1}; shift
    local add_vip=${1}; shift
    local cibfile=$(mktemp -u)

    # start HA on the new node
    pcs cluster start ${add_node}
    if [ $? -ne 0 ]; then
       logger "warning: pcs cluster start ${add_node} failed"
    fi

    pcs cluster cib ${cibfile}
    if [ $? -ne 0 ]; then
        logger "warning: pcs cluster cib ${cibfile} failed"
    fi

    # delete all the -cluster_ip-1 resources, clearing
    # their constraints, then create them again so we can
    # recompute their constraints
    clear_resources ${cibfile} ${HA_SERVERS}
    addnode_recreate_resources ${cibfile} ${add_node} ${add_vip}

    HA_SERVERS="${HA_SERVERS} ${add_node}"
    create_virt_ip_constraints ${cibfile} ${HA_SERVERS}

    pcs cluster cib-push ${cibfile}
    if [ $? -ne 0 ]; then
        logger "warning: pcs cluster cib-push ${cibfile} failed"
    fi
    rm -f ${cibfile}
}


deletenode_delete_resources()
{
    local node=${1}; shift
    local ha_servers=$(echo "${HA_SERVERS}" | sed s/${node}//)
    local cibfile=$(mktemp -u)

    pcs cluster cib ${cibfile}
    if [ $? -ne 0 ]; then
        logger "warning: pcs cluster cib ${cibfile} failed"
    fi

    # delete all the -cluster_ip-1 and -trigger_ip-1 resources,
    # clearing their constraints, then create them again so we can
    # recompute their constraints
    clear_resources ${cibfile} ${HA_SERVERS}
    recreate_resources ${cibfile} ${ha_servers}
    HA_SERVERS=$(echo "${ha_servers}" | sed -e "s/  / /")

    create_virt_ip_constraints ${cibfile} ${HA_SERVERS}

    pcs cluster cib-push ${cibfile}
    if [ $? -ne 0 ]; then
        logger "warning: pcs cluster cib-push ${cibfile} failed"
    fi
    rm -f ${cibfile}

}


deletenode_update_haconfig()
{
    local name="VIP_${1}"
    local clean_name=${name//[-.]/_}

    ha_servers=$(echo ${HA_SERVERS} | sed -e "s/ /,/")
    sed -i -e "s/^HA_CLUSTER_NODES=.*$/HA_CLUSTER_NODES=\"${ha_servers// /,}\"/" -e "s/^${name}=.*$//" -e "/^$/d" ${HA_CONFDIR}/ganesha-ha.conf
}


setup_state_volume()
{
    local mnt=${HA_VOL_MNT}
    local longname=""
    local shortname=""
    local dname=""
    local dirname=""

    longname=$(hostname)
    dname=${longname#$(hostname -s)}

    while [[ ${1} ]]; do

        if [[ ${1} == *${dname} ]]; then
            dirname=${1}
        else
            dirname=${1}${dname}
        fi

        if [ ! -d ${mnt}/nfs-ganesha/tickle_dir ]; then
            mkdir ${mnt}/nfs-ganesha/tickle_dir
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname} ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/statd ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/statd
            chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/statd
        fi
        if [ ! -e ${mnt}/nfs-ganesha/${dirname}/nfs/state ]; then
            touch ${mnt}/nfs-ganesha/${dirname}/nfs/state
            chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/state
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4recov ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4recov
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4old ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4old
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm
            chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm
        fi
        if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm.bak ]; then
            mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm.bak
            chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm.bak
        fi
        if [ ! -e ${mnt}/nfs-ganesha/${dirname}/nfs/statd/state ]; then
            touch ${mnt}/nfs-ganesha/${dirname}/nfs/statd/state
        fi
        for server in ${HA_SERVERS} ; do
            if [ ${server} != ${dirname} ]; then
                ln -s ${mnt}/nfs-ganesha/${server}/nfs/ganesha ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/${server}
                ln -s ${mnt}/nfs-ganesha/${server}/nfs/statd ${mnt}/nfs-ganesha/${dirname}/nfs/statd/${server}
            fi
        done
        shift
    done

}


enable_pacemaker()
{
    while [[ ${1} ]]; do
        if [ "${SERVICE_MAN}" == "/usr/bin/systemctl" ]; then
            ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i \
${SECRET_PEM} root@${1} "${SERVICE_MAN} enable pacemaker"
        else
            ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i \
${SECRET_PEM} root@${1} "${SERVICE_MAN} pacemaker enable"
        fi
        shift
    done
}


addnode_state_volume()
{
    local newnode=${1}; shift
    local mnt=${HA_VOL_MNT}
    local longname=""
    local dname=""
    local dirname=""

    longname=$(hostname)
    dname=${longname#$(hostname -s)}

    if [[ ${newnode} == *${dname} ]]; then
        dirname=${newnode}
    else
        dirname=${newnode}${dname}
    fi

    if [ ! -d ${mnt}/nfs-ganesha/${dirname} ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/statd ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/statd
        chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/statd
    fi
    if [ ! -e ${mnt}/nfs-ganesha/${dirname}/nfs/state ]; then
        touch ${mnt}/nfs-ganesha/${dirname}/nfs/state
        chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/state
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4recov ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4recov
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4old ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/v4old
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm
        chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm
    fi
    if [ ! -d ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm.bak ]; then
        mkdir ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm.bak
        chown rpcuser:rpcuser ${mnt}/nfs-ganesha/${dirname}/nfs/statd/sm.bak
    fi
    if [ ! -e ${mnt}/nfs-ganesha/${dirname}/nfs/statd/state ]; then
        touch ${mnt}/nfs-ganesha/${dirname}/nfs/statd/state
    fi

    for server in ${HA_SERVERS} ; do

        if [[ ${server} != ${dirname} ]]; then
            ln -s ${mnt}/nfs-ganesha/${server}/nfs/ganesha ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha/${server}
            ln -s ${mnt}/nfs-ganesha/${server}/nfs/statd ${mnt}/nfs-ganesha/${dirname}/nfs/statd/${server}

            ln -s ${mnt}/nfs-ganesha/${dirname}/nfs/ganesha ${mnt}/nfs-ganesha/${server}/nfs/ganesha/${dirname}
            ln -s ${mnt}/nfs-ganesha/${dirname}/nfs/statd ${mnt}/nfs-ganesha/${server}/nfs/statd/${dirname}
        fi
    done

}


delnode_state_volume()
{
    local delnode=${1}; shift
    local mnt=${HA_VOL_MNT}
    local longname=""
    local dname=""
    local dirname=""

    longname=$(hostname)
    dname=${longname#$(hostname -s)}

    if [[ ${delnode} == *${dname} ]]; then
        dirname=${delnode}
    else
        dirname=${delnode}${dname}
    fi

    rm -rf ${mnt}/nfs-ganesha/${dirname}

    for server in ${HA_SERVERS} ; do
        if [[ "${server}" != "${dirname}" ]]; then
            rm -f ${mnt}/nfs-ganesha/${server}/nfs/ganesha/${dirname}
            rm -f ${mnt}/nfs-ganesha/${server}/nfs/statd/${dirname}
        fi
    done
}


status()
{
    local scratch=$(mktemp)
    local regex_str="^${1}-cluster_ip-1"
    local healthy=0
    local index=1
    local nodes

    # change tabs to spaces, strip leading spaces
    pcs status | sed -e "s/\t/ /g" -e "s/^[ ]*//" > ${scratch}

    nodes[0]=${1}; shift

    # make a regex of the configured nodes
    # and initalize the nodes array for later
    while [[ ${1} ]]; do

        regex_str="${regex_str}|^${1}-cluster_ip-1"
        nodes[${index}]=${1}
        ((index++))
        shift
    done

    # print the nodes that are expected to be online
    grep -E "^Online:" ${scratch}

    echo

    # print the VIPs and which node they are on
    grep -E "${regex_str}" < ${scratch} | cut -d ' ' -f 1,4

    echo

    # check if the VIP and port block/unblock RAs are on the expected nodes
    for n in ${nodes[*]}; do

        grep -E -x "${n}-nfs_block \(ocf::heartbeat:portblock\): Started ${n}" > /dev/null 2>&1 ${scratch}
        result=$?
        ((healthy+=${result}))
        grep -E -x "${n}-cluster_ip-1 \(ocf::heartbeat:IPaddr\): Started ${n}" > /dev/null 2>&1 ${scratch}
        result=$?
        ((healthy+=${result}))
        grep -E -x "${n}-nfs_unblock \(ocf::heartbeat:portblock\): Started ${n}" > /dev/null 2>&1 ${scratch}
        result=$?
        ((healthy+=${result}))
    done

    grep -E "\):\ Stopped|FAILED" > /dev/null 2>&1 ${scratch}
    result=$?

    if [ ${result} -eq 0 ]; then
        echo "Cluster HA Status: BAD"
    elif [ ${healthy} -eq 0 ]; then
        echo "Cluster HA Status: HEALTHY"
    else
        echo "Cluster HA Status: FAILOVER"
    fi

    rm -f ${scratch}
}

create_ganesha_conf_file()
{
        if [ $1 == "yes" ];
        then
                if [  -e $GANESHA_CONF ];
                then
                        rm -rf $GANESHA_CONF
                fi
        # The symlink /etc/ganesha/ganesha.conf need to be
        # created using ganesha conf file mentioned in the
        # shared storage. Every node will only have this
        # link and actual file will stored in shared storage,
        # so that ganesha conf editing of ganesha conf will
        # be easy as well as it become more consistent.

                ln -s $HA_CONFDIR/ganesha.conf $GANESHA_CONF
        else
        # Restoring previous file
                rm -rf $GANESHA_CONF
                cp $HA_CONFDIR/ganesha.conf $GANESHA_CONF
                sed -r -i -e '/^%include[[:space:]]+".+\.conf"$/d' $GANESHA_CONF
        fi
}

set_quorum_policy()
{
    local quorum_policy="stop"
    local num_servers=${1}

    if [ ${num_servers} -lt 3 ]; then
        quorum_policy="ignore"
    fi
    pcs property set no-quorum-policy=${quorum_policy}
    if [ $? -ne 0 ]; then
        logger "warning: pcs property set no-quorum-policy=${quorum_policy} failed"
    fi
}

main()
{

    local cmd=${1}; shift
    if [[ ${cmd} == *help ]]; then
        usage
        exit 0
    fi

    if (selinuxenabled) ;then
     semanage boolean -m gluster_use_execmem --on
    fi

    HA_CONFDIR=${1%/}; shift
    local ha_conf=${HA_CONFDIR}/ganesha-ha.conf
    local node=""
    local vip=""

    # ignore any comment lines
    cfgline=$(grep  ^HA_NAME= ${ha_conf})
    eval $(echo ${cfgline} | grep -F HA_NAME=)
    cfgline=$(grep  ^HA_CLUSTER_NODES= ${ha_conf})
    eval $(echo ${cfgline} | grep -F HA_CLUSTER_NODES=)

    case "${cmd}" in

    setup | --setup)
        logger "setting up ${HA_NAME}"

        check_cluster_exists ${HA_NAME}

        determine_servers "setup"

        if [ "X${HA_NUM_SERVERS}X" != "X1X" ]; then

            determine_service_manager

            setup_cluster ${HA_NAME} ${HA_NUM_SERVERS} "${HA_SERVERS}"

            setup_create_resources ${HA_SERVERS}

            setup_finalize_ha

            setup_state_volume ${HA_SERVERS}

            enable_pacemaker ${HA_SERVERS}

        else

            logger "insufficient servers for HA, aborting"
        fi
        ;;

    teardown | --teardown)
        logger "tearing down ${HA_NAME}"

        determine_servers "teardown"

        teardown_resources ${HA_SERVERS}

        teardown_cluster ${HA_NAME}

        cleanup_ganesha_config ${HA_CONFDIR}
        ;;

    cleanup | --cleanup)
        cleanup_ganesha_config ${HA_CONFDIR}
        ;;

    add | --add)
        node=${1}; shift
        vip=${1}; shift

        logger "adding ${node} with ${vip} to ${HA_NAME}"

        determine_service_manager

        manage_service "start" ${node}

        determine_servers "add"

        pcs cluster node add ${node}
        if [ $? -ne 0 ]; then
            logger "warning: pcs cluster node add ${node} failed"
        fi

        addnode_create_resources ${node} ${vip}
        # Subsequent add-node recreates resources for all the nodes
        # that already exist in the cluster. The nodes are picked up
        # from the entries in the ganesha-ha.conf file. Adding the
        # newly added node to the file so that the resources specfic
        # to this node is correctly recreated in the future.
        clean_node=${node//[-.]/_}
        echo "VIP_${node}=\"${vip}\"" >> ${HA_CONFDIR}/ganesha-ha.conf

        NEW_NODES="$HA_CLUSTER_NODES,${node}"

        sed -i s/HA_CLUSTER_NODES.*/"HA_CLUSTER_NODES=\"$NEW_NODES\""/ \
$HA_CONFDIR/ganesha-ha.conf

        addnode_state_volume ${node}

        # addnode_create_resources() already appended ${node} to
        # HA_SERVERS, so only need to increment HA_NUM_SERVERS
        # and set quorum policy
        HA_NUM_SERVERS=$(expr ${HA_NUM_SERVERS} + 1)
        set_quorum_policy ${HA_NUM_SERVERS}
        ;;

    delete | --delete)
        node=${1}; shift

        logger "deleting ${node} from ${HA_NAME}"

        determine_servers "delete"

        deletenode_delete_resources ${node}

        pcs cluster node remove ${node}
        if [ $? -ne 0 ]; then
            logger "warning: pcs cluster node remove ${node} failed"
        fi

        deletenode_update_haconfig ${node}

        delnode_state_volume ${node}

        determine_service_manager

        manage_service "stop" ${node}

        HA_NUM_SERVERS=$(expr ${HA_NUM_SERVERS} - 1)
        set_quorum_policy ${HA_NUM_SERVERS}
        ;;

    status | --status)
        determine_servers "status"

        status ${HA_SERVERS}
        ;;

    refresh-config | --refresh-config)
        VOL=${1}

        determine_servers "refresh-config"

        refresh_config ${VOL} ${HA_CONFDIR} ${HA_SERVERS}
        ;;

    setup-ganesha-conf-files | --setup-ganesha-conf-files)

        create_ganesha_conf_file ${1}
        ;;

    *)
        # setup and teardown are not intended to be used by a
        # casual user
        usage
        logger "Usage: ganesha-ha.sh add|delete|status"
        ;;

    esac

    if (selinuxenabled) ;then
     semanage boolean -m gluster_use_execmem --off
    fi
}

main $*