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#!/bin/bash

#
# XenServer - change NFS server IP address...
#
# WARNING! This script works on "NFS Virtual disk storage" SRs only!!!
# Based on https://techblog.jeppson.org/2017/01/change-nfs-sr-address-xenserver/

# our parameters
SR_NAME_LABEL="NAS-Borg NFS4 XenProd"
NFS_SERVER=10.0.10.11
NFS_PATH=/mnt/BorgReplicationPool/XenRepProd 
NFS_VERSION=4.1
#end of parameters

set -e

host_uuid=$(xe host-list hostname=`hostname` --minimal)
echo "host-uuid='$host_uuid' for hostname='`hostname`'"
[ -n "$host_uuid" ] || {
        echo "Unable to get host-uuid for hostname='`hostname`'"
        exit 1
}

sr_uuid=$(xe sr-list name-label="$SR_NAME_LABEL" --minimal)
[ -n "$sr_uuid" ] || {
        echo "Unable to get sr-uuid for sr-name-label=\"$SR_NAME_LABEL\""
        exit 1
}
echo "sr-uuid=$sr_uuid"

sr_type=$(xe sr-list uuid=$sr_uuid params=type --minimal)
[ nfs = "$sr_type" ] || {
        echo "SR '$SR_NAME_LABEL' type '$sr_type' != 'nfs'"
        exit 1
}

pbd_uuid=$(xe pbd-list host-uuid=$host_uuid sr-name-label="$SR_NAME_LABEL" \
            --minimal)
[ -n "$pbd_uuid" ] || {
        echo "Unable to get pbd-uuid for \
 host-uuid=$host_uuid sr-name-label=\"$SR_NAME_LABEL\""
        exit 1
}
echo "pbd-uuid=$pbd_uuid"

set -x
xe pbd-unplug uuid=$pbd_uuid
xe pbd-destroy uuid=$pbd_uuid
set +x
new_pbd_file=`mktemp`
set -x
xe pbd-create host-uuid=$host_uuid sr-uuid=$sr_uuid \
   device-config:server=$NFS_SERVER \
   device-config:serverpath=$NFS_PATH \
   device-config:type=nfs \
   device-config:nfsversion=$NFS_VERSION > $new_pbd_file

set +x
[ -s "$new_pbd_file" ] || {
        echo "Unable to get new_pbd_id"
        exit 1
}
new_pbd_id=$(cat "$new_pbd_file")
set -x
xe pbd-plug uuid=$new_pbd_id
set +x

echo "Done"
exit 0