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#!/usr/bin/env python3
from math import *
from ROOT import TFile, TObject, TTree
from array import array
from ROOT import gDirectory
import sys
import os
def getGTfromDQMFile(DQMfile, RunNumber, globalTagVar):
if not os.path.isfile(DQMfile):# print "Error: file", DQMfile, "not found, exit"
sys.exit(0)
thefile = TFile( DQMfile )
globalTagDir = 'DQMData/Run ' + RunNumber + '/Info/Run summary/CMSSWInfo'
if not gDirectory.GetDirectory( globalTagDir ):
# print "Warning: globalTag not found in DQM file"
sys.exit(0)
keys = gDirectory.GetDirectory( globalTagDir ).GetListOfKeys()
key = keys[0]
globalTag = ''
while key:
obj = key.ReadObj()
if globalTagVar in obj.GetName():
globalTag = obj.GetName()[len("<"+globalTagVar+">s="):-len("</"+globalTagVar+">")]
break
key = keys.After(key)
if len(globalTag) > 1:
if globalTag.find('::') >= 0:
print(globalTag[0:globalTag.find('::')])
else:
print(globalTag)
return globalTag
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