#!/bin/sh
#
# Generate a CRUSH location for the given entity
#
# The CRUSH location consists of a list of key=value pairs, separated
# by spaces, all on a single line.  This describes where in CRUSH
# hierarhcy this entity should be placed.
#
# Arguments:
#   --cluster <clustername>   name of the cluster (see /etc/ceph/$cluster.conf)
#   --type <osd|mds|client>   daemon/entity type
#   --id <id>                 id (osd number, mds name, client name)
#

# if we start up as ./ceph-crush-location, assume everything else is
# in the current directory too.
if [ `dirname $0` = "." ] && [ $PWD != "/usr/bin" ]; then
    BINDIR=.
    SBINDIR=.
    LIBDIR=.
    ETCDIR=.
else
    BINDIR=/usr/bin
    SBINDIR=/usr/sbin
    LIBDIR=/usr/lib/ceph
    ETCDIR=/etc/ceph
fi

usage_exit() {
    echo "usage: $0 [--cluster <cluster>] --id <id> --type <osd|mds|client>"
    exit
}

cluster="ceph"
type=""
id=""
while [ $# -ge 1 ]; do
    case $1 in
	--cluster | -C)
	    shift
	    cluster="$1"
	    shift
	    ;;
	--id | -i)
	    shift
	    id="$1"
	    shift
	    ;;
	--type | -t)
	    shift
	    type="$1"
	    shift
	    ;;
	*)
	    echo "unrecognized option '$1'"
	    usage_exit
	    ;;
    esac
done

if [ -z "$type" ]; then
    echo "must specify entity type"
    usage_exit
fi

if [ -z "$id" ]; then
    echo "must specify id"
    usage_exit
fi

# try a generic location
location="$($BINDIR/ceph-conf --cluster=${cluster:-ceph} --name=$type.$id --lookup crush_location || :)"
if [ -n "$location" ]; then
    echo $location
    exit 0
fi

# spit out something generic
echo "host=$(hostname -s) root=default"

