#!/bin/bash
function setup_loopback_devices() {
  osd_data_device="$1"
  osd_wal_db_device="$2"
  namespace=${CEPH_NAMESPACE}
  sudo mkdir -p /var/lib/openstack-helm/$namespace
  sudo truncate -s 10G /var/lib/openstack-helm/$namespace/ceph-osd-data-loopbackfile.img
  sudo truncate -s 8G /var/lib/openstack-helm/$namespace/ceph-osd-db-wal-loopbackfile.img
  sudo losetup $osd_data_device /var/lib/openstack-helm/$namespace/ceph-osd-data-loopbackfile.img
  sudo losetup $osd_wal_db_device /var/lib/openstack-helm/$namespace/ceph-osd-db-wal-loopbackfile.img
  #lets verify the devices
  sudo losetup -a
}

while [[ "$#" > 0 ]]; do case $1 in
  -d|--ceph-osd-data) OSD_DATA_DEVICE="$2"; shift;shift;;
  -w|--ceph-osd-dbwal) OSD_DB_WAL_DEVICE="$2";shift;shift;;
  -v|--verbose) VERBOSE=1;shift;;
  *) echo "Unknown parameter passed: $1"; shift;;
esac; done

# verify params
if [ -z "$OSD_DATA_DEVICE" ]; then
  OSD_DATA_DEVICE=/dev/loop0
  echo "Ceph osd data device is not set so using ${OSD_DATA_DEVICE}"
else
  ceph_osd_disk_name=`basename "$OSD_DATA_DEVICE"`
  if losetup -a|grep $ceph_osd_disk_name; then
     echo "Ceph osd data device is already in use, please double check and correct the device name"
     exit 1
  fi
fi

if [ -z "$OSD_DB_WAL_DEVICE" ]; then
  OSD_DB_WAL_DEVICE=/dev/loop1
  echo "Ceph osd db/wal device is not set so using ${OSD_DB_WAL_DEVICE}"
else
  ceph_dbwal_disk_name=`basename "$OSD_DB_WAL_DEVICE"`
  if losetup -a|grep $ceph_dbwal_disk_name; then
     echo "Ceph osd dbwal device is already in use, please double check and correct the device name"
     exit 1
  fi
fi

: "${CEPH_NAMESPACE:="ceph"}"
# setup loopback devices for ceph osds
setup_loopback_devices $OSD_DATA_DEVICE $OSD_DB_WAL_DEVICE