adding device *metadata* to test.builder example

$ swift-ring-builder test.builder add r1z1-127.0.0.1:6000/sdb_555 1.0
$ swift-ring-builder test.builder
test.builder, build version 2
16 partitions, 1.000000 replicas, 1 regions, 1 zones, 1 devices, 0.00 balance, 0.00 dispersion
The minimum number of hours before a partition can be reassigned is 0 (0:00:00 remaining)
The overload factor is 0.00% (0.000000)
Ring file test.ring.gz is up-to-date
Devices:    id  region  zone      ip address  port  replication ip  replication port      name weight partitions balance flags meta
             0       1     1       127.0.0.1  6000       127.0.0.1              6000       sdb   1.00         16    0.00       555

test.conf

[object-replicator]
rsync_module = {replication_ip}:{meta}:object

test_rsync_module.py

#!/usr/bin/env python
import sys
from swift.common.ring import Ring
from swift.common.utils import readconf, rsync_module_interpolation

from argparse import ArgumentParser


parser = ArgumentParser()
parser.add_argument('--ring', default='/etc/swift/object.ring.gz',
                    help='the path to the ring')
parser.add_argument('--config', default='/etc/swift/object-server/1.conf.d',
                    help='the path to the config')


def main():
    args = parser.parse_args()
    r = Ring(args.ring)
    for dev in r.devs:
        if dev is None:
            continue
        break
    conf = readconf(args.config, 'object-replicator')
    template = conf.get('rsync_module', '{replication_ip}::object')
    print rsync_module_interpolation(template, dev)


if __name__ == "__main__":
    sys.exit(main())

validating the rsync_module template interpolation

$./test_rsync_module.py --ring test.ring.gz --config test.conf
127.0.0.1:555:object