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/usr/bin/ceres-node-write is in python-ceres 0.10.0~git20150525-1.

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#!/usr/bin/python

import sys
import time
from optparse import OptionParser
from ceres import CeresTree, getTree


parser = OptionParser(usage='''%prog [options] <path> <datapoint> [datapoint]+
  If --tree is specified, <path> is taken as a node path
  Otherwise <path> is taken as a filesystem path

Each datapoint is of the form <timestamp>:<value> where <timestamp> may
be a UNIX epoch time or the character 'N' to indicate 'now'.
''')
parser.add_option('--tree', default=None)

options, args = parser.parse_args()

if not args:
  parser.print_usage()
  sys.exit(1)


if options.tree:
  nodePath = args[0]
  tree = CeresTree(options.tree)

else:
  fsPath = args[0]
  tree = getTree(fsPath)

  if not tree:
    print "error: %s is not in a ceres tree" % fsPath
    sys.exit(1)

  nodePath = tree.getNodePath(fsPath)


datapoints = []
now = time.time()
for datapoint in args[1:]:
  timestamp, value = datapoint.split(':', 1)

  if timestamp == 'N':
    timestamp = now
  else:
    timestamp = float(timestamp)

  value = float(value)
  datapoints.append((timestamp, value))

datapoints.sort()

if not args:
  print "error: no datapoints specified"
  parser.print_usage()
  sys.exit(1)


node = tree.getNode(nodePath)
node.write(datapoints)